MCP takes pictures of real size, by id too, and waits for a cold model

The game's bridge found three things on the PoC. /mcp held its body to
64 KiB — the edit meant for it had raised the memory notes' limit instead —
so a 1024 px concept sent as base64 failed as "expected one JSON-RPC
request object". The notes are back to 64 KiB, /mcp takes 64 MB, and a
call past it is a 413 saying so.

/v1/files took batch files only, so a picture could not be sent once and
named after. purpose vision and user_data are kept too, as long as job
results, and generate_mesh hands a workflow model the id as it is.

generate_image and review_images failed at once while their model was
cold. They wait out an answer that says when to come back — loading,
another model holding the GPU, a full queue — for as long as the call may,
saying who holds the GPU and about how long; a refusal that says no
Retry-After, a spent budget, is said at once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

BACKLOG.md

@@ -386,10 +386,9 @@ portal is not done — the page shows; the console and ctl change.
    tenant-admin / billing; `ctl audit`. Depends on A5 for a real actor.
 2. **Done (branch `features-c`):** OIDC sign-in (`auth.oidc`, PKCE,
    verified email, roles and memberships from groups, `no_passwords`) and
-   SCIM 2.0 (`/scim/v2` Users and Groups). Left: the sign-in cookie is
-   signed with a per-process key, so with two control planes behind a
-   balancer the callback must reach the one that started it (sticky
-   sessions) until the key comes from the store. **OIDC/SSO login (M), then SCIM (M).** `internal/account/service.go`,
+   SCIM 2.0 (`/scim/v2` Users and Groups). The sign-in cookie's key comes
+   from the store (2026-10-10), so a callback may reach either control
+   plane behind a balancer. **OIDC/SSO login (M), then SCIM (M).** `internal/account/service.go`,
    `internal/web/account.go`; map IdP groups to org/team/admin.
 3. **Done (branch `features-c`):** key lifetime limits (gateway, org, team,
    project), `keys rotate --overlap`, kinds and expiry in `keys list`.
@@ -405,8 +404,9 @@ portal is not done — the page shows; the console and ctl change.
    lost, budget spent, update available; signed JSON or Slack; retries,
    hourly de-duplication), `ctl notify test`, Alertmanager receiver
    templates. Left: `server init` and the console do not yet ask for a
-   receiver — the templates are filled in by hand; each control plane sends
-   budget events on its own, so two behind a balancer may both send one.
+   receiver — the templates are filled in by hand. Events are claimed in
+   the store before they are sent (2026-10-10), so two control planes send
+   each once.
    **Alerting out of the box (S).** `deploy/monitoring/alertmanager.yml`
    ships `receiver: none`; add Slack/email/webhook/PagerDuty receiver
    templates driven by `server init` or the console; llmgw-native webhooks
@@ -1065,6 +1065,371 @@ training yet; quality gating of a published adapter is by hand (ctl eval).
 
 ---
 
+### F5. Large imports (M) — measured 2026-10-09, open
+The metallurgy corpus (2,314 files, 108,779 chunks, bge-m3 on the one
+GPU) went in at about 25 chunks/s, the same over a phone hotspot and the
+LAN. The engine's slots were the limit: llama.cpp `--parallel 4` embeds
+four texts per pass, while llmgw-kb sends 32 a request from 6 workers. The
+usage rows show 4.6 s a request on average, 1.8 s of it in the gateway's
+queue and 0.04 s in the guard. The GPU sat at 18–50% and the store machine
+at a third of its CPUs.
+- An embedding model's profile with many slots by default (`--parallel`
+  32–64, `--ctx-size` to match, `--batch-size`/`--ubatch-size` at least the
+  longest chunk), or `ctl model serve` choosing that for a model with
+  `capabilities.embeddings`. With the default 512, one 516-token chunk failed.
+- Embedding on the gateway's side of a document PUT, so the client sends
+  text only: today an embeddings answer is ~21 KB of JSON a chunk, and
+  the text and vector go up again (~11 KB).
+- The store next: HNSW inserts took half of one of pg01's two cores; at a
+  million chunks the vectors alone outgrow its 4 GB. halfvec (pgvector ≥
+  0.7) and a larger store machine.
+- Done: a batch of embeddings checked text by text against the context
+  (branch `embeddings-batch`); it was refused as one over-long prompt.
+- Done: `query_prefix` on an embedding model, before questions only.
+- Qwen3-Embedding-4B on the RTX 6000 (2026-10-09): llama.cpp Q8 1,575
+  tok/s as first set up (32k cache, 16 slots), 2,700 with a 16k cache,
+  FlashAttention and ubatch 1–2k; f16 no better. vLLM fp16 (`--runner
+  pooling`) 6,200 direct, 4,700–4,900 through the gateway in the import,
+  and its vectors match llama.cpp's (cosine 0.9995). The 103,579 chunks
+  took 3 h. Done (2026-10-10, branch `admission-bulk`): a source per
+  profile, so an embedding model's GPU profile runs vLLM and its CPU
+  profile llama.cpp; a band's own `queue_ttl` for bulk imports, and
+  `Retry-After` on a busy refusal, which is what had turned passages away
+  (llmgw-kb retries only what says when to).
+- Retrieval on 40 questions written from the corpus, document in the top
+  5: bge-m3 31/40 (Turkish questions 13/21), Qwen3-Embedding-4B 37/40
+  (18/21), with its query prefix 36/40 and first place 31/40 instead of
+  28 (MRR 0.738 → 0.789 → 0.838). Next: translating the question with the
+  chat model, and a reranker.
+
+## G. Jobs: 3D generation through ComfyUI (2026-10-10)
+
+A request for a 3D model takes minutes on the one 24 GB card, and the card has to be
+emptied of the chat model first. That is not a request to hold a socket for
+— `internal/router/activate.go:46` already says so — it is a job: queued,
+answered with an id, asked after, its result downloaded. The job machinery
+is built first and tested without a GPU; the ComfyUI generalisation and the
+custom-node install come after. Decided 2026-10-10: a `jobs` table of its
+own rather than a one-line batch (the JSONL shape would be artificial and
+has nowhere for progress), and progress is shown, not just a status.
+
+Which models (decided 2026-10-10): the assets go into a game sold on
+Steam, worldwide, the EU included, so the licence of the output decides
+before the quality does. Hunyuan3D (every version) is out: Tencent's
+licence excludes the EU, UK and South Korea, and whether a game shipped
+there with its outputs is "use in the Territory" is not a question to
+leave to a court. In, in this order: **TRELLIS.2** shape (MIT; the best
+geometry; its own texture baking goes through nvdiffrec and nvdiffrast,
+both under NVIDIA's non-commercial source licence, so that stage is not
+run), **Step1X-3D** (Apache 2.0, StepFun; shape and texture in one, the
+EU-safe textured path — its ComfyUI node and VRAM need are to be
+checked), **Direct3D-S2** (MIT, DreamTech; high-detail shape, has a
+ComfyUI node) if TRELLIS.2's detail falls short. Not in: TripoSR and
+InstantMesh (permissive but superseded), Stable Fast 3D (Stability's
+community licence, revenue-capped; served all the same since 2026-10-10
+at the user's request, see G3), SAM 3D Objects (Meta's own licence,
+to be read before it is considered). Steam's disclosure form (changed
+2026-01-16) lists pre-generated 3D models as content that must be
+declared on the store page: the licence notice G3 writes into the GLB is
+what the studio answers that form from.
+
+### G1. Jobs: store, worker, endpoints (M) — done 2026-10-10 (branch `jobs-g1`)
+Built as written, with two choices: a job found running after its gateway
+died is run again from the start (the prompt id column is there for G2 to
+follow the same work instead), and the request is validated at the door
+only as far as costs nothing — key, model, allowlist, the request's shape
+— with limits, guardrails and admission applied when the worker replays it,
+said as the job's error. The result file's `content_type` is the job's; the
+files endpoint still serves every file as an octet stream.
+- Store: `jobs` (id, owner key/principal, kind, model, status, input
+  (JSON), progress (JSON: queue position, percent, step), result file id,
+  error, created/started/finished, lease owner/until), migrations for
+  sqlite and postgres beside `internal/store/batches.go`, whose
+  claim/renew/release lease pattern is copied, not shared: a job is one
+  unit of work, a batch is many lines.
+- Worker: `internal/router/jobworker.go` after `batchworker.go`. Any
+  gateway on the store claims a queued job, asks for the model with
+  `activator.Want` and waits as long as it takes (no `ActivationWait`
+  bound: nobody is holding a connection), runs it, stores the output
+  through the files store, writes usage and price, marks it done. A
+  gateway that dies mid-job loses its lease and another one picks it up;
+  the ComfyUI prompt id is in the job row so the second gateway asks
+  after the same work rather than queueing it again.
+- Endpoints: `POST /v1/3d/generations` validates like any inference
+  request (key, allowlist, limits, admission, guardrails on the prompt),
+  writes the job, answers 202 with `{id, status: "queued"}`;
+  `GET /v1/3d/generations/{id}` returns status, progress and, when done,
+  `output_file_id` and the usage; `POST .../{id}/cancel`; the file comes
+  from `GET /v1/files/{id}/content`. Owner-scoped like batches. Results
+  are kept for the batch files' retention and deleted with them: a
+  departure from `images.go`'s "kept nowhere", because a mesh is a
+  download, not a JSON field; the retention is the bound.
+- Done when: a job survives the gateway that took it being killed, a
+  cancelled job leaves ComfyUI's queue (`comfy.Client.cancel`), two
+  gateways never both run one job (test with the lease), and the usage
+  row carries the job's price.
+
+### G2. Progress from ComfyUI (S, after G1) — done 2026-10-10 (branch `jobs-3d`)
+Built as written: the gate's websocket under its own client id, the
+client_id of every /prompt rewritten, /progress/{prompt_id} on the gate,
+the router reading it and /queue into the job (only into a job of the same
+key). Left: a node that reports no steps (TripoSR's) shows its name and no
+percent; a vanished replica is said by the job failing, not by progress.
+The gate (`internal/comfy/gate.go`) passes seven paths and no websocket.
+Rather than open `/ws`, the gate subscribes to ComfyUI's own `/ws` once,
+with `golang.org/x/net/websocket` (already a dependency), under a client
+id of its own, and rewrites the `client_id` of every `/prompt` it
+forwards to that one. It keeps the last `executing`, `progress`
+(value/max/node) and `execution_error` message per prompt id and serves
+them at `GET /progress/{prompt_id}` on the gate; the router polls that
+beside `/history` and `/queue` and writes queue position, percent and the
+current node's class into the job's progress. The gate's buffer is
+bounded (the last N prompts) and the websocket reconnects. Done when a
+3D job shows "queued, 2 ahead" then "running 40%, step 12/30" in
+`ctl jobs` and on the account page, and a job whose replica vanished
+says so within one poll.
+
+### G3. ComfyUI beyond pictures: 3D models and custom nodes (M, after G1) — done 2026-10-10 (branch `jobs-3d`), with TripoSR
+Built: output kinds, image upload through the gate, every output list
+fetched, OBJ to GLB, licence in /v1/models, the job and the GLB, per_mesh
+and usage.meshes (migration 0045), custom nodes cloned at their commit by
+the gate with packages beside the replica (a node's named packages at its
+range, the rest at ComfyUI's versions). Not as written: the model. On the
+PoC's Turing card TRELLIS.2 cannot run — it needs Meta's gated DINOv3,
+its published background remover (RMBG-2.0) is non-commercial, and its
+sparse attention and Direct3D-S2's need flash-attention (Ampere and
+newer). TripoSR (MIT) proves the chain on cuda01: a .glb from a picture
+in about 30 s. Left: background removal before TripoSR (BiRefNet, MIT,
+as a node), TRELLIS.2 or Direct3D-S2 on an Ampere card with an ungated
+encoder, a missing node refusing the replica by name.
+Added 2026-10-10 at the user's request, beside the order above: **Stable
+Fast 3D** as `sf3d` (Stability AI Community License: free under US$1 M
+annual revenue, an enterprise licence above, "Powered by Stability AI"),
+the textured mesh that runs on Turing: about 1 s a mesh warm in fp16,
+UV-mapped GLB with its texture, 18 GB of the card at peak. Its weights are
+gated, so they were fetched once with the user's token into
+/srv/llmgw-comfy/stable-fast-3d and linked into the engine user's
+Hugging Face cache, which its loader node reads by repository name; no
+token is on the machine at runtime. Its own save node returns the GLB as
+base64, which the gate cannot fetch, so `LLMGWSaveMesh` writes the file;
+`LLMGWPrepareForMesh` now also gives the object's mask. Left: its two
+CUDA extensions (texture_baker, uv_unwrapper) are not on PyPI, so they
+were built on cuda01 and installed into the engine's venv by hand; a
+custom node's requirements need a way to name a local build, or the
+engine install must carry them, before a customer site gets this. And
+rembg's default session now fetches BRIA RMBG-2.0 (non-commercial):
+every workflow must name its rembg model (ours say u2net).
+- Catalog: a model makes `pictures` or `meshes` (`MakesImages` becomes an
+  output kind; `ServesComfyUI` stays). 3D weight folders in the gate's
+  `modelFolders`; the workflow's placeholders gain `image` (the input
+  picture, base64 in the request, written to the replica's `input/` by
+  the gate through a new `POST /upload/image` the gate allows — or a
+  base64-loading node, whichever TRELLIS.2's wrapper wants).
+- `comfy.Client.fetch` reads every output key, not `images` only, and
+  fetches each file named by `/view`; `Image` becomes `Artifact` with its
+  content type (model/gltf-binary, application/octet-stream for .obj).
+- Custom nodes: a model (or the engine config) names git repositories
+  and a pip requirements list; the agent's provision step clones them
+  into the replica's `custom_nodes/` (the gate's `--base-directory` is
+  where ComfyUI looks, not the install directory) and installs the
+  requirements into the engine's venv with the same PyTorch index and
+  lock discipline as A8. A replica with a missing node refuses to start
+  with the node's name in the error rather than ComfyUI's traceback.
+- Licence of the output (decided 2026-10-10: it matters). A catalog model
+  carries `license: {name, url, notice}`; a job's answer, `/v1/models`
+  and the portal page show it beside the result, and the mesh's GLB
+  `asset.extras` carries the notice too, since the file travels without
+  the API. What was checked on 2026-10-10: TRELLIS.2 weights are MIT and
+  its outputs free, but its texture baking depends on nvdiffrast, whose
+  NVIDIA Source Code License is non-commercial — a commercial service
+  must render textures another way or skip that stage. Hunyuan3D 2.0 and
+  2.1 claim no rights in outputs, but the licence excludes the EU, UK and
+  South Korea, needs Tencent's permission above 1 M monthly active users,
+  forbids using outputs to train other models, and asks for "Powered by
+  Tencent Hunyuan"; the notice ships with any distribution. TripoSR is
+  MIT, InstantMesh Apache 2.0. Every one of them trained on Objaverse,
+  some of whose objects are CC-BY-NC: a provenance question no licence
+  text settles, to be said in the notice rather than hidden.
+- Pricing: `per_image` stays; `per_mesh` beside it in `accounting.Price`,
+  `Outcome.Meshes`, the usage sums and exports (as eaea671 did for
+  pictures).
+- Done when: TRELLIS.2 on cuda01 with `scaling: {min: 0,
+  idle_timeout: 10m}` makes a .glb from a picture through G1's endpoint
+  with nvdiffrast and nvdiffrec not installed in its venv (the licence
+  is kept by the install, not by a note), the GLB carries the MIT
+  notice,
+  the card is free again after the idle timeout, and the same request
+  against flux-schnell is refused as "makes pictures, not meshes".
+
+### G4. Portal and console (S, after G2) — done 2026-10-10 (branch `jobs-3d`)
+Built: /3d with model-viewer served from the gateway, progress, download
+and licence; `ctl 3d list|get|cancel` over /api/v1/client-jobs (ctl jobs
+was taken by the control plane's own work). Left: the console's Jobs view.
+A 3D page beside `/images` (upload a picture, watch progress, download
+the .glb, a viewer with `<model-viewer>` from the allowed CDNs), `ctl
+jobs list|get|cancel`, the console's Jobs view. The page sends down the
+same path as the API, like `imagesSend` does.
+
+## H. ComfyUI as a platform (written 2026-10-11)
+
+G made one model at a time work: flux for pictures, TripoSR and SF3D for
+meshes, each with its own endpoint, its own request shape and its own
+replica. The user's direction (2026-10-11): llmgw is a generic platform,
+and should serve whatever ComfyUI can run — pictures, edits, video,
+audio, meshes, upscaling, segmentation — as data in the catalog rather
+than code per model. Two decisions shape everything below:
+
+- **The licence is metadata, not a filter.** llmgw does not leave a
+  model out because of its licence. The licence travels with the model
+  and with every file it makes; what a site will not serve is that
+  site's policy (H6). The game studio's EU constraint is one such policy,
+  not a decision the code makes for everyone.
+- **The install fits the hardware.** The PoC has one Turing card; other
+  sites will have Ampere, Ada and Hopper. A catalog entry must be
+  writable once and placed sensibly anywhere: fp16 on Turing, bf16 or
+  fp8 where the card has them, flash-attention models only where it
+  runs, CUDA extensions built for the card that runs them (H2, H4).
+
+The first set of models proves the structure at its corners rather than
+by licence: Qwen-Image-Edit (several weight files, two pictures in),
+Wan 2.2 small (video out, a long job), ACE-Step (audio out), SF3D (a
+package not on PyPI, gated weights), Hunyuan3D (a licence that excludes
+the EU, which H6 must be able to say no to).
+
+### H1. A workflow says what it takes and makes (M) — built 2026-10-11, not yet tried on the PoC
+Built as written, with three choices: a run answers with one file, the
+first of its output kind (several outputs as one zip is left); the
+workflow's placeholders are checked against the inputs when a run is
+served, since the catalog never reads the workflow file; and video,
+audio and files count as nothing in usage until a per-run price exists
+(per_image and per_mesh still count pictures and meshes).
+- Catalog: `comfyui.inputs` — a list of `{name, type, required, default,
+  min, max, choices, max_mb, doc}`, type one of text, int, float, bool,
+  choice, image, mask, audio, video, file. Each is a placeholder of the
+  same name in the workflow. The template's own placeholders are checked
+  against the list when the catalog is built: one the workflow uses that
+  no input or built-in names is refused there, not at the first request.
+- `comfyui.output` gains `video`, `audio` and `files` beside `pictures`
+  and `meshes`; `files` takes whatever the workflow saves. `comfy.Image`
+  becomes `comfy.File` and `typeByName` knows mp4, webm, gif, wav, flac,
+  mp3, ogg.
+- Endpoint: `POST /v1/workflows/runs` with `{model, inputs: {...}}`, a
+  job like G1's (`GET /v1/workflows/runs[/{id}]`, `.../cancel`). A file
+  input is base64, a data URL, or a `file-…` id from `/v1/files` for
+  what is too big to send inline (video, long audio). Files go into the
+  replica's input directory through the gate's `/upload/image`, which
+  ComfyUI uses for any file. `/v1/images/generations` and
+  `/v1/3d/generations` stay as they are, as fixed shapes over the same
+  machinery.
+- The models list (`/v1/models`) gives each ComfyUI model its inputs and
+  output kind, so a client can build a form without reading the catalog.
+- Done when: the existing flux, triposr and sf3d entries work unchanged,
+  and one model with a picture and a text input (Qwen-Image-Edit) runs
+  through `/v1/workflows/runs` with a 400 for a missing required input
+  before any job is written.
+
+### H2. Profiles that fit the hardware (M) — built 2026-10-11
+Built as written. A profile by need is left out of placement until the
+cluster's cards are known: with no class, placement would have read it as
+a CPU profile. A profile's own `source` is loaded under its own file name
+by the workflow's `{{checkpoint}}`.
+- A profile may say `gpu: {min_compute_capability, min_memory_gb}` in
+  place of `gpu_class`. When the reconciler places a model, such a
+  profile stands for every GPU class in the cluster that meets it, at
+  the profile's priority: the catalog function that turns profiles into
+  placement's view takes the cluster's classes (class, compute
+  capability, memory) and returns one concrete profile per class that
+  fits, named `<profile>@<class>`. Placement itself is unchanged: it
+  still sees exact classes, and a tensor-parallel group still never
+  mixes them.
+- A ComfyUI profile may carry its own `comfyui` block (workflow, nodes,
+  checkpoint) over the model's: the fp8 workflow on compute 8.9 and up,
+  the fp16 one on 7.5. A Turing card is not an error, it is the profile
+  that fits it.
+- Done when: one catalog entry with an "ampere+" profile (min 8.0) and a
+  "turing" fallback places the fallback on cuda01, and the same entry,
+  in a test with an A100 in the inventory, places the other.
+
+### H3. Environments: which models can share a replica (S, the catalog side)
+- `comfyui.environment: <name>` puts a model in a named environment.
+  Models in one environment must agree on every custom node they both
+  name (same repository, same commit) and their requirements must
+  resolve together; the catalog refuses an environment that cannot, with
+  both models' names. Models with no environment are each their own, as
+  today.
+- `Catalog.Environments()` returns each environment with its models and
+  the union of their nodes: what one replica of it must install.
+- Placement and eviction of a replica that serves every model of its
+  environment (so flux, SF3D and Qwen-Image-Edit stop handing the card to
+  each other with a 30 s cold start each time) is the other session's
+  work (llmgw-b7), built on this.
+
+### H4. Custom nodes with packages that are built, not downloaded (S) — built 2026-10-11
+Built as written, with `uv build --no-build-isolation` against ComfyUI's
+Python, the card's capability asked of torch in the replica (so
+CUDA_VISIBLE_DEVICES is the card it will run on), and wheels kept under
+the engines' cache by commit, `sm<arch>` and directory. Also
+`comfyui.huggingface_repo`: a node that loads its weights by repository
+name (SF3D's) finds them in the engines' Hugging Face cache, linked by the
+gate, so no token is on the node.
+- `nodes[].build: [subdir, ...]`: directories of the node's repository
+  that are Python packages with C++/CUDA extensions (SF3D's texture_baker
+  and uv_unwrapper). The gate builds each as a wheel with the engine's
+  Python, `TORCH_CUDA_ARCH_LIST` set from the compute capability of the
+  card it runs on, and installs it into the replica's own `site` like
+  any other requirement. Built wheels are kept under the engine's home by
+  node commit, subdirectory and architecture, so the second replica on
+  the same kind of card does not build again.
+- A node needing nvcc on a node without it refuses the replica with that
+  said, not with a compiler's traceback.
+- Done when: SF3D runs on cuda01 with nothing installed into the engine's
+  venv by hand (the hand install of 2026-10-10 removed first).
+
+### H5. Licence on every output (S) — done 2026-10-14: the whole licence in GLB asset.extras and PNG iTXt; video and audio not yet
+- `License` gains `id` (SPDX where there is one, else a lowercase name:
+  stability-community, tencent-hunyuan-community), `commercial` (unset is
+  not said), `excluded_regions` (ISO 3166 codes, `EU` for the union),
+  `revenue_cap_usd` and `attribution` ("Powered by Stability AI"). All
+  optional but the name. Done 2026-10-11 in the catalog, so H6 can match
+  on `id`.
+- Written into the file where the format has a place for it: glTF
+  `asset.extras.license` (as now), PNG an `iTXt` chunk named `license`
+  (the workflow's own text chunks are still stripped), MP4/WebM and the
+  audio formats in their metadata where ffmpeg is at hand on the router,
+  otherwise beside it in the job's answer only — said in the docs.
+
+### H6. Licence choices (S) — done 2026-10-11 (4bbac08), live on the PoC
+The user asked (2026-10-11) for the choice to be a person's: on their
+profile they pick the licences they will not use, and their keys and
+portal session neither see those models in `/v1/models` nor may call
+them (403, saying which licence). Matched on `license.id`, and on
+`commercial` / `excluded_regions` where a choice is put that way. Its
+store table is migration 0046. A site-wide or team-wide default can sit
+on top of it later.
+
+### H7. A job worker per model, not one for all (S) — done 2026-10-14: one job per model at a time, eight in all
+The worker runs one job at a time: a job waiting for the card holds up a
+job for another model that could run now (seen on the PoC, 2026-10-10).
+Jobs are claimed and run concurrently up to a limit per model (or per
+environment, after H3) and a cluster-wide cap, with the lease and
+leader-only rules of G1 kept.
+
+### H8. Presets that add themselves (S) — done 2026-10-13 (v0.14.5)
+flux-schnell and triposr come with llmgw (`ctl model add <preset>`), and
+the leader adds them on demand where a node fits one, the cluster installs
+ComfyUI and the catalog makes nothing of that kind (`presets.auto`); a
+preset removed is declined and not added back. The cluster page and the
+console show and add them.
+
+### H9. Small things learned on the PoC (2026-10-14)
+- Done: `albedo_match` on sf3d (its delighting made dark objects light);
+  `on_demand.evict_after_idle` / `min_lifetime` as live settings; an
+  upgrade that leaves nodes behind says which; `ctl model serve` serves an
+  embedding model for embedding; refreshes wait while a form is filled in.
+- Open: llmgw's `/mcp` with picture, 3D, VLM and workflow tools, so a
+  client needs no server of its own (asked by the game team); the shared
+  ComfyUI replica (H3's placement side).
+
 ## D. Facts worth knowing before starting
 
 - Admin API: `127.0.0.1:9090`, no auth, `ctlClient` in `internal/cli/ctl.go`.

CHANGELOG.md

@@ -18,14 +18,400 @@ is only released once its **exit criterion** is met, not when its code lands.
 | v0.11.0 | — | High availability from setup, the setup and console screens, usage sums and per-tenant alerts | released |
 | v0.12.0 | — | The cluster's settings in the store, in force when changed; the firewall switch; wipe | released |
 | v0.13.0 | — | The whole system stopped and started from one command; Qwen3Guard judges, on a GPU and CPUs together | released |
-| v0.14.0 | — | Knowledge bases: documents from people's own machines, kept apart per tenant, answered from | released (v0.14.1: adapters, the tree over the API, the firewall on every machine) |
-| v1.0.0 | 5 | Tenancy, prefix affinity, benchmarking | planned |
+| v0.14.0 | — | Knowledge bases: documents from people's own machines, kept apart per tenant, answered from | released (v0.14.1: adapters, the tree over the API, the firewall on every machine; v0.14.2: pictures from ComfyUI; v0.14.3: 3D models as jobs) |
+| v1.0.0 | 5 | What phase 5 has left: precise KV routing proven on vLLM, the block cost picker, defragmentation across NVLink domains, prefill/decode disaggregation | planned |
 
 Until v1.0.0 the minor version is the breaking one: configuration formats and Go
 APIs change between minors without a deprecation period.
 
 ## Unreleased
 
+### Added
+
+- **Pictures uploaded to work from**: `/v1/files` takes `purpose=vision` or
+  `user_data` besides `batch`, kept as long as job results, so a picture is
+  sent once and named by its `file-…` id in the MCP tools and a workflow's
+  inputs.
+- **One ComfyUI for an environment's models**: ComfyUI models in one
+  `comfyui.environment` (two or more) share one replica — the catalog
+  makes it a hidden entry, `comfyui-env-<name>`, on the first member's
+  profiles with the most memory any member needs, carrying every member's
+  weights and custom nodes. Asking for any member starts it; it answers for
+  each with that member's workflow and checkpoint, and the members get no
+  replicas of their own. A picture model and a 3D model on one card stop
+  handing it to each other with a cold start each way.
+- **Pictures, 3D models, vision and workflows as MCP tools** at `/mcp`,
+  beside the memory notes, each offered only where the gateway has a model
+  for it: `generate_image` (with `concept`, `side` and `texture` styles),
+  `generate_mesh` (from a picture or a prompt), `review_images` (a vision
+  model, to a JSON schema), `run_workflow`, `job_status` and
+  `gateway_status`. Each makes its request under the caller's key, so
+  allowlists, limits, licences and budgets apply and it is charged like
+  any request; what it makes is kept as the caller's file and answered by
+  id and download URL. A client that takes a stream gets
+  `notifications/progress` while a mesh is made and waits up to ten
+  minutes; one that does not, 50 seconds, then the job id.
+- **Setup asks where alerts go**: `llmgw server init --webhook URL`
+  (repeatable) and a **Notification webhooks** field on both setup screens.
+  Slack's, Mattermost's and Rocket.Chat's addresses are sent Slack's text,
+  any other the event as JSON (`slack:` or `json:` in front says which).
+  They are added to the cluster's `notify.webhooks` beside those already
+  there, and each is sent a test once the control plane runs on them.
+
+- **Extended thinking on `/v1/messages`**: `thinking: {type: "enabled"}`
+  tells a model that thinks by its chat template to (`enable_thinking`),
+  and its reasoning comes back as `thinking` blocks before the text,
+  streamed as `thinking_delta` events; `disabled` tells it not to. Not
+  asked for, the reasoning is left out as before.
+- **How long on-demand models hold a card** is a setting, in force on the
+  leader within seconds: `on_demand.evict_after_idle` (2m unless set) and
+  `on_demand.min_lifetime` (5m). On one card shared by a picture model and
+  a 3D model, 1m each brings the wait between a picture and its mesh to
+  about a minute.
+
+### Fixed
+
+- A model whose weights and context pool did not fit its card was added
+  and then failed to make its context on every start, taking the card from
+  others each time (Apertus 70B with a 65536-token pool, 8B with 131072, on
+  24 GB). `ctl model serve` shrinks the pool to what the card holds, saying
+  so, and refuses weights that do not fit at all; the portal's serve form
+  refuses such a pool and says the largest that fits.
+- Removing weights from the mirror that a catalog model still loads is
+  refused, naming the model: removed from the mirror alone, the model stayed
+  in the catalog and its replicas went on loading the node's copy.
+- Jobs ran one at a time, so a 3D job waiting for the card held up another
+  model's job that could have run. They run side by side, one per model at
+  a time and eight in all, on the leader as before.
+- `llmgw ctl model serve` served an embedding model as a chat model: no
+  `--embedding`, four slots, a 512-token batch, `embeddings` unset and a
+  "say hello" smoke test it could not pass. A model whose GGUF says it
+  pools (or `--embeddings`) is served for embedding: 32 slots of 1024
+  tokens unless sized otherwise, a batch that holds a whole passage, and
+  one vector asked for as its smoke test.
+- `llmgw ctl upgrade` checks every node's version once the waves are done
+  and fails naming any not on the release, and says when the control plane
+  has no nodes registered; `llmgw upgrade` on a control plane says how many
+  nodes it left behind and the command that upgrades them. A site's nodes
+  stayed a release behind with nothing to say so.
+- The cluster and node pages swapped their live part every few seconds,
+  forms and all, so filling one in raced the clock: what was typed, an
+  open choice and the focus were lost. The refresh now waits while a field
+  in it has the focus or a form in it has been typed into and not sent;
+  the mirror page's reload during a download waits the same way.
+
+## v0.14.5 — 2026-10-14
+
+Picture and 3D models that add themselves where a card fits them, with a
+card on the portal and a screen in the console to see and add them; a
+mesh's colour brought to the picture it was made from; and the whole
+licence written into every mesh.
+
+**Upgrading.**
+- The store gains a table (migration 0047: preset_state); nothing to do.
+- **`presets.auto` is on**: once upgraded, the leading control plane adds
+  flux-schnell and triposr, on demand, where a node's card fits one, the
+  cluster installs ComfyUI (`engines.comfyui`) and the catalog makes
+  nothing of that kind. Nothing is fetched until somebody asks for one.
+  Turn it off with `llmgw ctl model presets auto off`.
+- **Nodes** need this release for `albedo_match` (it is in the save node
+  the gate puts in each replica); a ComfyUI replica takes it when it
+  starts again.
+
+### Added
+
+- **A mesh's base colour brought to its picture's**: `LLMGWSaveMesh` takes
+  `albedo_match` with the picture and its mask, and scales the texture in
+  linear light to the object's brightness in the picture. Stable Fast 3D
+  takes the light out of what it sees and read a dark basalt (0.17) as a
+  light stone dimly lit (0.67); matched, it is 0.17. On sf3d it is the
+  `albedo_match` input (off unless asked).
+- **Picture and 3D models by themselves**: once a node has a card that fits
+  flux-schnell or triposr and the catalog makes nothing of that kind, the
+  leading control plane adds the preset on demand — so a new cluster's
+  portal has its Images and 3D pages without a definition written — where
+  the cluster installs ComfyUI. `presets.auto` turns it off; a preset
+  somebody removes is not added back. `GET /api/v1/presets` says how each
+  stands and why one is not added; `POST /api/v1/presets/{name}` adds one
+  (and sets `engines.comfyui` if the cluster has none); `PUT
+  /api/v1/presets/auto`. Each automatic addition is in the audit log.
+- **Presets on the portal and in the console**: the cluster page's
+  **Pictures and 3D models** card lists each preset — what it makes, the
+  classes it fits here, whether and by whom it was added, why the leader
+  has not — with an **Add** button that says first when it would install
+  ComfyUI and restart the control planes, and the switch for `presets.auto`.
+  The console's models screen shows the same; **A** adds one, **P** flips
+  the switch. `ctl model add PRESET` and `ctl model presets` go through the
+  API (and `ctl model presets auto on|off`), falling back to the entry as
+  v0.14.4 sent it on an older control plane.
+
+### Fixed
+
+- A mesh carried only its licence's name, URL and notice; it carries the
+  whole licence as `/v1/models` gives it — id, commercial use, excluded
+  regions, revenue cap, attribution — for a pipeline that sorts assets by
+  licence.
+- A workflow's `{{name|false}}` default filled a BOOLEAN input with the
+  word rather than a boolean.
+
+
+## v0.14.4 — 2026-10-13
+
+Any ComfyUI workflow as a job, with typed inputs; picture and 3D models
+added by name; profiles that fit whatever card a site has, and ComfyUI on
+a V100; licences a machine can match and a person can leave out; a job
+waiting for the one card says what holds it. Many fixes to on-demand
+models taking turns on one card.
+
+**Upgrading.**
+- The store gains a table (migration 0046: user_excluded_licences);
+  nothing to do.
+- **Nodes** need this release for ComfyUI on Volta or Pascal cards (the
+  cu126 build), for a driver from NVIDIA's open kernel module to be read,
+  and for a node that loads its weights by repository name (sf3d); a
+  ComfyUI already installed is kept.
+- **Control planes before nodes**: an entry using the built-in `triposr`
+  workflow, or a `gpu:` need instead of a class, is refused by an older
+  control plane.
+- Models added with `llmgw ctl model add <preset>` take the preset's name;
+  remove an entry of that name first.
+
+### Added
+
+- **The client API described**: OpenAPI 3.1 at `/v1/openapi.json`, no key
+  needed, generated from a route table a test holds to the router's own;
+  and `/docs/api`, Swagger UI (served from the gateway) over it and, for
+  staff, over the admin API's document.
+- **A job waiting for the card says so**: `progress` is
+  `{"state":"waiting_gpu","held_by":…,"eta_seconds":…}` while another
+  on-demand model holds it; a direct request's 503 carries
+  `X-Llmgw-Waiting-For` and `X-Llmgw-Eta-Seconds`.
+- **Any ComfyUI workflow, as a job**: `POST /v1/workflows/runs` with
+  `{model, inputs}`. A model's catalog entry declares its inputs
+  (`comfyui.inputs`: text, int, float, bool, choice, image, mask, audio,
+  video, file, with bounds and defaults) and its output (`comfyui.output`:
+  pictures, meshes, video, audio or files); a request is checked against
+  them before a job is written, file inputs are base64, a data URL or a
+  `/v1/files` id, and `/v1/models` lists each model's `workflow` so a
+  client can build its form. A PNG result carries the licence in an
+  `iTXt` chunk, a GLB in `asset.extras` as before.
+- **Environments**: `comfyui.environment` names ComfyUI models that agree
+  on their custom nodes and may share one replica; the catalog refuses
+  one that cannot.
+- **Profiles that fit the hardware**: a profile may say `gpu:
+  {min_compute_capability, min_memory_gb}` instead of `gpu_class`, and
+  stands for every class in the cluster that meets it, as
+  `<profile>@<class>`; a ComfyUI profile may carry its own `comfyui`
+  workflow, checkpoint and nodes, and any profile its own `source`. One
+  catalog entry then runs fp8 where the card has it and fp16 on Turing.
+- **Custom nodes that compile**: `nodes[].build` names directories of a
+  node that are C++/CUDA packages; the gate builds each as a wheel for the
+  card the replica runs on, keeps it on the node, and installs it beside
+  the replica. `comfyui.huggingface_repo` shows a model's weights to a node
+  that loads them by repository name.
+- **A licence a machine can match**: `license.id`, `commercial`,
+  `excluded_regions`, `revenue_cap_usd`, `attribution`.
+- **On-demand models in `/v1/models`**, with `loaded` saying whether one is
+  up now; a picture is cut out and put on grey before TripoSR sees it
+  (`LLMGWPrepareForMesh`, rembg when it has no alpha).
+- **Licences a person leaves out**: on the profile page, by licence, or by
+  rule — every licence forbidding commercial use, every licence granting
+  nothing in a region — so a model under one is neither listed to nor
+  served for that person's keys and sessions (403 `licence_excluded`).
+- **Presets: a picture or 3D model added by name.** `llmgw ctl model add
+  flux-schnell` or `triposr` adds an entry that comes with llmgw — its
+  workflow (TripoSR's now built in), custom nodes, packages and licence,
+  and a profile by card need rather than class — and has the nodes install
+  ComfyUI when the cluster's settings name none. `llmgw ctl model presets`
+  lists them; the console's **A** on the models screen offers them beside
+  a definition file.
+
+### Fixed
+
+- A model waiting for another on-demand model to give up the card failed at
+  once as "cannot be placed"; it now waits, and a job with it.
+- A model evicted for being idle was placed again on the next pass, ahead of
+  the one it made room for.
+- A job or batch leased by a standby control plane, whose router has no
+  endpoints, waited on "loading" for good; they are served only by the
+  leader. A job told its model fits nowhere asks again for five minutes
+  before failing, which an agent re-registering makes true for seconds.
+- An on-demand replica adopted after a restart was never idle enough to
+  evict, so a model waiting for its card waited out its whole idle timeout;
+  it counts as used at adoption.
+- A picture in a prompt was counted as its base64 by the context check, so
+  one 1280x720 PNG was "138 thousand tokens" and a vision model refused it;
+  a picture or a sound now counts as about a thousand.
+- An on-demand model of a higher class was evicted, idle, for a lower-class
+  one two minutes into a lull; it keeps the card through its idle timeout,
+  and a model waiting on it is told so.
+- A model removed from the catalog stayed wanted, so added again it loaded
+  unasked.
+- A node that loads its weights by repository name (sf3d) went to Hugging
+  Face for a gated repository and got a 401: the agent did not hand the
+  gate `comfyui.huggingface_repo`, so the weights on the node were never
+  linked into its cache.
+- **ComfyUI on a V100.** torch's CUDA 12.8 and newer builds have no Volta
+  kernels, but its cu129 build was taken to run from compute capability
+  7.0, so on a V100 both ComfyUI builds were installed, about 10 GB each,
+  and failed with "no kernel image". Cards older than Turing now get
+  ComfyUI on PyTorch's CUDA 12.6 torch (build `cu126`); a Turing or newer
+  node keeps the build it has.
+- **The open NVIDIA driver read by its version.** With the open kernel
+  module, the default since 560, the agent read the driver as "for" and so
+  as unknown, and tried every engine build whatever driver it needs.
+
+## v0.14.3 — 2026-10-10
+
+3D models from a picture, as jobs: made by ComfyUI on the cluster's cards,
+with their progress, their licence written into the mesh, a price per mesh
+and a page to make them. Also: a profile's own weights, a band for bulk
+work, and fixes for control planes behind a balancer and agents that
+restart.
+
+**Upgrading.**
+- The store gains tables and columns (migrations 0043–0045: notify_sent,
+  jobs, usage meshes); nothing to do.
+- **Nodes** need this release for their engines' output to survive an
+  agent restart and for ComfyUI's custom nodes and progress; engines
+  started by an older agent keep its pipe until they are restarted.
+- A 3D model needs a model that makes them (see install.md, "A model that
+  makes them"); none is added.
+
+### Added
+
+- **Jobs: 3D models asked after, not waited for.** `POST
+  /v1/3d/generations` answers 202 with a job id; `GET
+  /v1/3d/generations/{id}` says its status, progress and, when done, the
+  file its result is in (`/v1/files/{id}/content`); `POST .../cancel` stops
+  it, in the engine's queue too. The request is replayed by whichever
+  gateway holds the job's lease through the same path a client's request
+  takes — key, allowlist, limits, admission, guardrails, accounting — so
+  it is charged like any request, tagged `job=<id>`, and a model still
+  loading is waited out for as long as the job has (24 h) rather than
+  refused. A job survives the gateway that took it; results are kept for
+  `router.batch.retain_days`. Migration 0044.
+- **ComfyUI models that make meshes** (`comfyui.output: meshes`). The
+  picture is uploaded to the replica's ComfyUI and the workflow's
+  `{{image}}`; the mesh the workflow saves is the job's file, an OBJ turned
+  into a GLB. TripoSR (MIT) is the tested model; on Ampere and newer cards
+  stronger ones can be added the same way.
+- **Custom nodes** (`comfyui.nodes`): a repository at a full commit, put in
+  each replica's own `custom_nodes` by the gate, with its packages
+  installed beside the replica, never into ComfyUI's environment.
+- **A job's progress**: the gate listens to ComfyUI's websocket and the job
+  says queued and how many ahead, then the node running, its step and
+  percent.
+- **A model's `license`** (name, url, notice), in `/v1/models`, in the job,
+  on the portal and in the GLB's `asset.extras`.
+- **`per_mesh`** in `auth.pricing`; usage rows, sums and exports count
+  `meshes`.
+- **`/3d` on the portal**, beside `/images`: a picture chosen, the job
+  followed, the mesh in a viewer with a download and its licence; and
+  **`llmgw ctl 3d list|get|cancel`** for every owner's jobs.
+- **A profile's own `source`**: the weights it loads instead of the
+  model's, so an embedding model can run on vLLM from its repository on a
+  card and on llama.cpp from a GGUF on CPUs as one model. Placement prefers
+  nodes holding each profile's weights, `ctl model add` checks every
+  source, and `ctl weights` collects none a profile loads.
+- **A band's own `queue_ttl`** (`router.admission.bands[].queue_ttl`): how
+  long its requests may wait for room, instead of the admission's 30 s. A
+  band for bulk work — a knowledge-base import — waits behind people rather
+  than being turned away.
+
+### Fixed
+
+- **An engine's output no longer breaks when its agent restarts.** Engines
+  wrote to a pipe of the agent's, which an agent that restarted and adopted
+  them left with no reader; an engine's next large write failed, and in a
+  Python engine took the request it was reporting on with it. Each process
+  now writes to its own file in the agent's work directory, and an adopted
+  engine's log keeps what it wrote before the restart.
+- **Single sign-on behind a balancer.** The cookie that carries a sign-in
+  across the identity provider was signed with a key of each process's own,
+  so with two control planes a callback that reached the other one was
+  refused. The key is now a secret in the store, the same on every control
+  plane.
+- **Notifications sent once by two control planes.** Each kept its own
+  hour of quiet per event, so a budget spent on a team both served was
+  announced twice. The control plane that claims an event in the store
+  (migration 0043) sends it; with the store unreachable it is sent anyway.
+- **A request turned away for a busy cluster says when to come back.** A
+  request that waited as long as it may (504) or found the queue full (503)
+  had no `Retry-After`, so `llmgw-kb` counted the passage as failed instead
+  of sending it again; both now say 10 seconds.
+- The usage sums and exports count pictures (`images`), as the request
+  records did; pictures made before are added to the sums.
+
+## v0.14.2 — 2026-10-10
+
+Pictures: OpenAI's `/v1/images/generations`, made by ComfyUI on the
+cluster's own cards. The agents install ComfyUI themselves, the gateway
+prices pictures by the picture, and the portal has a page to make them.
+Also: on-demand models that survive a failover, and knowledge-base
+embeddings fixes.
+
+**Upgrading.**
+- The store gains a column (`usage.images`); nothing to do.
+- **ComfyUI is installed only where asked**: `llmgw ctl config set
+  engines.comfyui 0.39.2` has every node with an NVIDIA GPU build it (about
+  10 GB under `/opt/llmgw/engines`). Nodes need this release to install it
+  or run engine `comfyui`.
+
+### Added
+
+- **Pictures at `/v1/images/generations`**, OpenAI's shape, through the same
+  key, allowlist, limit, admission and guardrail checks as any request. A
+  model with profiles on engine `comfyui` is placed on a GPU node like any
+  other. A ComfyUI server outside the cluster can be an external model with
+  `api: comfyui` instead. The workflow is a built-in (`flux-schnell`, the
+  default, or `flux-dev`) or a JSON file in ComfyUI's API format, with
+  `{{prompt}}`, `{{width}}`, `{{seed}}` and the like where the request's
+  values go. Requests may also send `seed`, `steps`, `negative_prompt` and
+  `guidance`. The seed used comes back in `x-llmgw-seed`. Pictures come back
+  as `b64_json`; ComfyUI's workflow is stripped from each PNG, and a client
+  that leaves takes its workflow off the queue. `/v1/models` says `images`
+  for such a model.
+- **Engine `comfyui`.** ComfyUI asks for no key, so the agent starts it
+  behind `llmgw comfyui-gate`. ComfyUI listens on the loopback only. The
+  gate listens on the replica's port, demands the replica's key, and lets
+  through only what the router asks. The model's `comfyui:` block names
+  the workflow and, for a source that is a set of files, the checkpoint.
+- **The agents install ComfyUI** (`engines.comfyui`). The release's source is
+  checked against a digest llmgw holds, since GitHub publishes none, and a
+  version without one is refused. Its requirements are resolved as PyPI
+  stood the day after the release, with PyPI's CUDA 13 torch or PyTorch's
+  CUDA 12.9 one for an older driver, and the result is checked on the card.
+  A ComfyUI installed by hand is named by `engines.comfyui.dir` in
+  agent.yaml.
+- **A price per picture**: `per_image` in `auth.pricing`, on top of the
+  prompt's tokens. A model priced only per picture is not free, so a spent
+  budget still stops it. Each usage row keeps how many pictures were made,
+  shown by `llmgw ctl request`.
+- **`/images` on the portal**, beside the chat, for the models that make
+  pictures. The chat no longer offers them. The page offers size, how many,
+  seed, steps and a negative prompt, and shows each picture with its seed
+  and a download link. Nothing is kept but the usage.
+- **An embedding model's `query_prefix`**, put before the question a
+  knowledge-base search embeds and never before documents, for Qwen3-Embedding
+  and models trained like it.
+
+### Fixed
+
+- **An awake on-demand model survived no restart or change of leader of the
+  control plane.** A control plane that had heard no requests read every
+  on-demand replica its nodes reported as wanted by nobody, and drained them
+  all. An adopted replica now gets a whole idle timeout.
+- `ctl models` said `not placed` for an on-demand model that had been woken
+  and was serving; it now says `ready (on demand)`.
+- A batch of embeddings was refused as one over-long prompt when the
+  passages together exceeded the context, though each one fit. The longest
+  input is what has to fit.
+- The chat's kept conversation sat in the browser under one key for
+  everybody, so the next person to sign in on the same browser opened the
+  last one's conversation. It is kept per account, and signing out clears
+  what the pages stored.
+
 ## v0.14.1 — 2026-10-09
 
 Adapters trained on the nodes from a knowledge base and kept private to

README.md

@@ -30,7 +30,7 @@ Releases track the roadmap phases; see [CHANGELOG.md](CHANGELOG.md).
 | v0.1.0 | 0 | Skeleton and sim-engine | released |
 | v0.2.0 | 1 | Static router (filter/score/pick, streaming proxy) | released |
 | v0.3.0 | 1.5 | Admission control (priority bands) | released |
-| v0.4.0 | 2 | Agent: GPU/IB discovery, engine supervision | released |
+| v0.4.0 | 2 | Agent: GPU/IB discovery, engine supervision | released as part of v0.5.0 |
 | v0.5.0 | 3 | Control plane: catalog, placement, reconciler, ctl | released |
 | v0.6.0 | 4 | Multi-node placement and fabric awareness | released |
 | v0.7.0 | — | Conversations, agent memory, disk management | released |
@@ -40,8 +40,8 @@ Releases track the roadmap phases; see [CHANGELOG.md](CHANGELOG.md).
 | v0.11.0 | — | High availability from setup, the setup and console screens, usage sums and per-tenant alerts | released |
 | v0.12.0 | — | The cluster's settings in the store, in force when changed; the firewall switch; wipe | released |
 | v0.13.0 | — | The whole system stopped and started from one command; Qwen3Guard judges, on a GPU and CPUs together | released |
-| v0.14.0 | — | Knowledge bases: documents from people's own machines, kept apart per tenant, answered from | released (v0.14.1: adapters, the tree over the API, the firewall on every machine) |
-| v1.0.0 | 5 | Tenancy, prefix affinity, benchmarking | planned |
+| v0.14.0 | — | Knowledge bases: documents from people's own machines, kept apart per tenant, answered from | released (v0.14.1: adapters, the tree over the API, the firewall on every machine; v0.14.2: pictures from ComfyUI; v0.14.3: 3D models as jobs; v0.14.4: any ComfyUI workflow as a job, presets, licences; v0.14.5: picture and 3D models that add themselves) |
+| v1.0.0 | 5 | What phase 5 has left: precise KV routing proven on vLLM, the block cost picker, defragmentation across NVLink domains, prefill/decode disaggregation | planned |
 
 As of v0.6.0 a cluster runs unattended: agents report their hardware, the
 control plane places replicas — including ones larger than a single machine —
@@ -50,6 +50,35 @@ budgets and rate limits decide who may use any of it.
 
 Since v0.11.0 (each release's detail is in [CHANGELOG.md](CHANGELOG.md)):
 
+- **Picture and 3D models that add themselves** (v0.14.5). Where a node's
+  card fits flux-schnell or triposr and the catalog makes nothing of that
+  kind, the leader adds it on demand, so a new cluster's portal has its
+  Images and 3D pages; the cluster page and the console show each preset
+  and add it by hand, and `presets.auto` turns it off. Stable Fast 3D's
+  colours can be brought to the picture's (`albedo_match`), and every mesh
+  carries its whole licence.
+- **Any ComfyUI workflow, and models by name** (v0.14.4). `POST
+  /v1/workflows/runs` runs a ComfyUI model's workflow as a job, its inputs
+  (text, numbers, choices, images, masks, audio, video, files) declared in
+  the catalog and listed in `/v1/models`. `llmgw ctl model add triposr` or
+  `flux-schnell` adds a tested model with no YAML; a profile may name the
+  card it needs instead of a class, and ComfyUI now installs on V100s. A
+  licence carries what a machine can match, and a person can leave
+  licences out on the profile page so no key of theirs reaches such a
+  model. A 3D job waiting for the one card says what holds it and for
+  about how long.
+- **3D models as jobs** (v0.14.3). `POST /v1/3d/generations` answers with a
+  job, asked after until its mesh is ready to download. ComfyUI makes it on
+  the cluster's own cards, TripoSR being the tested model. The job says how
+  far along it is, the model's licence is written into the GLB, and
+  `per_mesh` prices it. People make them at `/3d` on the portal; `llmgw ctl
+  3d` shows every owner's jobs. A model profile may also load weights of
+  its own, and an admission band may wait longer than the rest, for bulk
+  work.
+- **Pictures from ComfyUI** (v0.14.2). `POST /v1/images/generations` is made
+  by ComfyUI, behind a gate that demands the replica's key, as an engine the
+  agents install from its source checked against a digest. `per_image`
+  prices it, and people make pictures at `/images` on the portal.
 - **Adapters, and the tenancy tree over the API** (v0.14.1). `llmgw ctl
   kb dataset` and `llmgw ctl train` make a LoRA adapter from a collection
   on a node's spare GPU memory, kept on the mirror and seen only by its

docs.go

@@ -96,6 +96,12 @@ func titleOf(src, path string) string {
 //go:embed docs/admin-api.openapi.json
 var AdminOpenAPI []byte
 
+// ClientOpenAPI is the client API described in OpenAPI 3.1, generated from
+// internal/clientapi's route table and served at /v1/openapi.json.
+//
+//go:embed docs/client-api.openapi.json
+var ClientOpenAPI []byte
+
 // EvalSuites are the example quality suites under deploy/eval, which the
 // control plane runs by name when its eval directory has none of the name.
 //

docs/admin-api.openapi.json

@@ -29,6 +29,9 @@
     {
       "name": "capacity"
     },
+    {
+      "name": "client-jobs"
+    },
     {
       "name": "eval"
     },
@@ -83,6 +86,9 @@
     {
       "name": "plan"
     },
+    {
+      "name": "presets"
+    },
     {
       "name": "projects"
     },
@@ -280,6 +286,133 @@
         }
       }
     },
+    "/api/v1/client-jobs": {
+      "get": {
+        "operationId": "getClientJobs",
+        "summary": "Jobs clients asked for — 3D models — of every owner, newest first",
+        "tags": [
+          "client-jobs"
+        ],
+        "parameters": [
+          {
+            "name": "status",
+            "in": "query",
+            "description": "Only jobs in this status: queued, running, cancelling, completed, failed, cancelled, expired.",
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "name": "limit",
+            "in": "query",
+            "description": "The most jobs to answer with; 50 when absent.",
+            "schema": {
+              "type": "integer"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/JobView"
+                  }
+                }
+              }
+            }
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "default": {
+            "$ref": "#/components/responses/Error"
+          }
+        }
+      }
+    },
+    "/api/v1/client-jobs/{id}": {
+      "get": {
+        "operationId": "getClientJobsId",
+        "summary": "One job a client asked for",
+        "tags": [
+          "client-jobs"
+        ],
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "description": "The job's ID, job_….",
+            "schema": {
+              "type": "string"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/JobView"
+                }
+              }
+            }
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "default": {
+            "$ref": "#/components/responses/Error"
+          }
+        }
+      }
+    },
+    "/api/v1/client-jobs/{id}/cancel": {
+      "post": {
+        "operationId": "postClientJobsIdCancel",
+        "summary": "Stop a job, in the engine's queue too",
+        "tags": [
+          "client-jobs"
+        ],
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "description": "The job's ID, job_….",
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "$ref": "#/components/parameters/Actor"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/JobView"
+                }
+              }
+            }
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "default": {
+            "$ref": "#/components/responses/Error"
+          }
+        }
+      }
+    },
     "/api/v1/eval/runs": {
       "get": {
         "operationId": "getEvalRuns",
@@ -3521,6 +3654,116 @@
         }
       }
     },
+    "/api/v1/presets": {
+      "get": {
+        "operationId": "getPresets",
+        "summary": "The models that come with llmgw: whether each fits this cluster, is in the catalog, was declined",
+        "tags": [
+          "presets"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/PresetsView"
+                }
+              }
+            }
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "default": {
+            "$ref": "#/components/responses/Error"
+          }
+        }
+      }
+    },
+    "/api/v1/presets/auto": {
+      "put": {
+        "operationId": "putPresetsAuto",
+        "summary": "Turn on or off the adding of presets when a node fits them",
+        "tags": [
+          "presets"
+        ],
+        "parameters": [
+          {
+            "$ref": "#/components/parameters/Actor"
+          }
+        ],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/PresetsAutoRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/PresetsView"
+                }
+              }
+            }
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "default": {
+            "$ref": "#/components/responses/Error"
+          }
+        }
+      }
+    },
+    "/api/v1/presets/{name}": {
+      "post": {
+        "operationId": "postPresetsName",
+        "summary": "Add a preset to the catalog, and clear its decline",
+        "tags": [
+          "presets"
+        ],
+        "parameters": [
+          {
+            "name": "name",
+            "in": "path",
+            "required": true,
+            "description": "The preset's name, as `llmgw ctl model presets` lists it.",
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "$ref": "#/components/parameters/Actor"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ModelAdded"
+                }
+              }
+            }
+          },
+          "401": {
+            "$ref": "#/components/responses/Unauthorized"
+          },
+          "default": {
+            "$ref": "#/components/responses/Error"
+          }
+        }
+      }
+    },
     "/api/v1/projects": {
       "post": {
         "operationId": "postProjects",
@@ -5073,7 +5316,7 @@
         }
       },
       "Unauthorized": {
-        "description": "The admin token is missing or wrong.",
+        "description": "The token is missing or wrong.",
         "content": {
           "application/json": {
             "schema": {
@@ -6016,6 +6259,52 @@
           }
         }
       },
+      "JobView": {
+        "type": "object",
+        "description": "JobView is one job.",
+        "properties": {
+          "id": {
+            "type": "string"
+          },
+          "owner": {
+            "type": "string"
+          },
+          "key_id": {
+            "type": "string"
+          },
+          "endpoint": {
+            "type": "string"
+          },
+          "model": {
+            "type": "string"
+          },
+          "status": {
+            "type": "string"
+          },
+          "progress": {
+            "description": "Any JSON value."
+          },
+          "output_file_id": {
+            "type": "string"
+          },
+          "content_type": {
+            "type": "string"
+          },
+          "error": {
+            "type": "string"
+          },
+          "created_at": {
+            "type": "string",
+            "format": "date-time"
+          },
+          "started_at": {
+            "type": "string"
+          },
+          "finished_at": {
+            "type": "string"
+          }
+        }
+      },
       "JudgeAskRequest": {
         "type": "object",
         "description": "JudgeAskRequest is a text to have a judge read.",
@@ -7305,6 +7594,85 @@
           }
         }
       },
+      "PresetView": {
+        "type": "object",
+        "description": "PresetView is one preset as it stands in this cluster.",
+        "properties": {
+          "name": {
+            "type": "string"
+          },
+          "makes": {
+            "type": "string"
+          },
+          "description": {
+            "type": "string"
+          },
+          "card": {
+            "type": "string"
+          },
+          "licence": {
+            "$ref": "#/components/schemas/catalog.License"
+          },
+          "fits": {
+            "type": "boolean",
+            "description": "Fits is whether some node has a card that meets the preset's need; FitsClasses names those classes."
+          },
+          "fits_classes": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          },
+          "in_catalog": {
+            "type": "boolean"
+          },
+          "added_by": {
+            "type": "string",
+            "description": "AddedBy is \"auto\" when the leader added it, who did otherwise, \"\" when it was not added as a preset; AddedAt is when."
+          },
+          "added_at": {
+            "type": "string",
+            "format": "date-time"
+          },
+          "declined": {
+            "type": "boolean",
+            "description": "Declined is whether somebody removed it after it was added, so it is not added again by itself; adding it again clears that."
+          },
+          "blocked": {
+            "type": "string",
+            "description": "Blocked is why the leader does not add it by itself — presets.auto off, no ComfyUI, no card that fits, declined, another model already making the same — empty when it would or has."
+          }
+        }
+      },
+      "PresetsAutoRequest": {
+        "type": "object",
+        "description": "PresetsAutoRequest turns the automatic adding of presets on or off.",
+        "properties": {
+          "on": {
+            "type": "boolean"
+          }
+        }
+      },
+      "PresetsView": {
+        "type": "object",
+        "description": "PresetsView is the models that come with llmgw, and whether the leader adds them by itself.",
+        "properties": {
+          "auto": {
+            "type": "boolean",
+            "description": "Auto is whether a preset is added when a node fits it and the catalog has no model that makes what it makes (presets.auto)."
+          },
+          "comfyui": {
+            "type": "string",
+            "description": "ComfyUI is engines.comfyui as it stands: the version the nodes install, \"\" for none — in which case adding a preset sets it, and the control planes start again on that."
+          },
+          "presets": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/PresetView"
+            }
+          }
+        }
+      },
       "ProjectView": {
         "type": "object",
         "description": "ProjectView is a project, with how many people and keys are in it.",
@@ -7595,6 +7963,14 @@
             "type": "integer",
             "format": "int64"
           },
+          "images": {
+            "type": "integer",
+            "format": "int64"
+          },
+          "meshes": {
+            "type": "integer",
+            "format": "int64"
+          },
           "cost_micros": {
             "type": "integer",
             "format": "int64"
@@ -8565,6 +8941,82 @@
           },
           "embeddings": {
             "type": "boolean"
+          },
+          "images": {
+            "type": "boolean",
+            "description": "Images is a model that makes pictures, asked for at /v1/images/generations. Implied by an external model whose API is ComfyUI's."
+          },
+          "meshes": {
+            "type": "boolean",
+            "description": "Meshes is a model that makes 3D models from a picture, asked for as a job at /v1/3d/generations. Implied by a ComfyUI model whose output is meshes."
+          }
+        }
+      },
+      "catalog.ComfyUI": {
+        "type": "object",
+        "description": "ComfyUI is a ComfyUI model's workflow and checkpoint.",
+        "properties": {
+          "workflow": {
+            "type": "string",
+            "description": "Workflow is a built-in's name (flux-schnell, the default, or flux-dev) or a JSON file on the control plane, in ComfyUI's API format."
+          },
+          "checkpoint": {
+            "type": "string",
+            "description": "Checkpoint is the file the workflow's {{checkpoint}} names: the source's own name unless set, which a source that is a set of files must."
+          },
+          "output": {
+            "type": "string",
+            "description": "Output is what the workflow makes: pictures (the default), asked for at /v1/images/generations; meshes, asked for as a job at /v1/3d/generations from a picture; or video, audio or files. Every kind is asked for as a job at /v1/workflows/runs too."
+          },
+          "inputs": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/catalog.Input"
+            },
+            "description": "Inputs are what the workflow takes from a request at /v1/workflows/runs, each the placeholder of its name."
+          },
+          "nodes": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/catalog.CustomNode"
+            },
+            "description": "Nodes are custom nodes the workflow needs, put in each replica's own custom_nodes at the commit named."
+          },
+          "huggingface_repo": {
+            "type": "string",
+            "description": "HuggingFaceRepo is the repository a custom node loads the weights by name from (Stable Fast 3D's loader asks for stabilityai/stable-fast-3d): the replica's weights are shown to the node there, in the Hugging Face cache of the engines' user, so nothing is fetched and no token is needed when it runs."
+          },
+          "environment": {
+            "type": "string",
+            "description": "Environment names the models that may share one ComfyUI replica: every model of an environment agrees on the custom nodes they both name, so one replica can carry all of them and ComfyUI moves between their weights itself. Empty is an environment of the model alone."
+          }
+        }
+      },
+      "catalog.CustomNode": {
+        "type": "object",
+        "description": "CustomNode is a ComfyUI node from a git repository.",
+        "properties": {
+          "repo": {
+            "type": "string",
+            "description": "Repo is the repository, https only."
+          },
+          "commit": {
+            "type": "string",
+            "description": "Commit is the full commit the node is used at: a branch moves, and a node that changed under a model is a model that changed unasked."
+          },
+          "requirements": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "Requirements are the PyPI packages the node needs, by name and version range only. They are installed beside the replica, never into ComfyUI's environment: a package named here at the range named, and every other one at the version ComfyUI already runs. One named here is first on ComfyUI's path, so its range must suit ComfyUI too."
+          },
+          "build": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "Build are directories of the repository that are Python packages to be compiled rather than downloaded: C++ and CUDA extensions no index has (Stable Fast 3D's texture_baker and uv_unwrapper). Each is built as a wheel with ComfyUI's Python for the card the replica runs on, kept on the node for the next replica on the same kind of card, and installed beside the replica like its requirements."
           }
         }
       },
@@ -8605,6 +9057,32 @@
           "peer": {
             "type": "string",
             "description": "Peer names the federated llmgw cluster this model is offered by, for a model that federation added (`llmgw ctl federation add`) rather than one written by hand. Such a model is named PEER/MODEL, comes and goes with the peer's own list, and is sent only while the peer is up."
+          },
+          "api": {
+            "type": "string",
+            "description": "API is what the provider speaks: OpenAI's, unless this says comfyui — a ComfyUI server, asked for pictures at /v1/images/generations and sent the workflow below with the request's prompt in it. Model is then the checkpoint file the workflow loads, as ComfyUI lists it."
+          },
+          "workflow": {
+            "type": "string",
+            "description": "Workflow is the ComfyUI workflow, in its API format: a built-in's name (flux-schnell, the default, or flux-dev) or a JSON file on the control plane."
+          },
+          "output": {
+            "type": "string",
+            "description": "Output is what it makes: pictures, or meshes (see ComfyUI.Output)."
+          }
+        }
+      },
+      "catalog.GPUNeed": {
+        "type": "object",
+        "description": "GPUNeed is what card a profile needs.",
+        "properties": {
+          "min_compute_capability": {
+            "type": "number",
+            "description": "MinComputeCapability is the oldest architecture that runs it: 7.5 is Turing, 8.0 Ampere (bf16, flash-attention 2), 8.9 Ada (fp8), 9.0 Hopper."
+          },
+          "min_memory_gb": {
+            "type": "integer",
+            "description": "MinMemoryGB is the card's own memory it needs."
           }
         }
       },
@@ -8625,6 +9103,88 @@
           }
         }
       },
+      "catalog.Input": {
+        "type": "object",
+        "description": "Input is one thing a workflow takes from a request: the placeholder {{name}} in its graph, filled with the request's inputs.name.",
+        "properties": {
+          "name": {
+            "type": "string",
+            "description": "Name is the placeholder's, and the request's key."
+          },
+          "type": {
+            "type": "string",
+            "description": "Type is one of text, int, float, bool, choice, image, mask, audio, video, file. The last five are files, sent as base64, a data URL, or the id of a file uploaded to /v1/files, and put in ComfyUI's input directory; the placeholder gets the name they were given there."
+          },
+          "required": {
+            "type": "boolean",
+            "description": "Required inputs must be in every request; the others take Default, or the workflow's own {{name|default}}."
+          },
+          "default": {},
+          "min": {
+            "type": "number",
+            "description": "Min and Max bound a number; for text, Max bounds its length."
+          },
+          "max": {
+            "type": "number"
+          },
+          "choices": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "Choices are what a choice may be."
+          },
+          "max_mb": {
+            "type": "integer",
+            "description": "MaxMB bounds a file input; zero is the type's own bound."
+          },
+          "doc": {
+            "type": "string",
+            "description": "Doc says what the input is for, to whoever fills it in."
+          }
+        }
+      },
+      "catalog.License": {
+        "type": "object",
+        "description": "License is the terms what a model makes comes under: said beside every result, and written into a mesh, which travels without the API.",
+        "properties": {
+          "id": {
+            "type": "string",
+            "description": "ID names the licence for a machine: an SPDX identifier where there is one (MIT, Apache-2.0, CC-BY-NC-4.0), else a lowercase name of the licence's own (stability-community, tencent-hunyuan-community). What a person's or a site's choice of licences matches on. Name is for people."
+          },
+          "name": {
+            "type": "string",
+            "description": "Name is the licence's own: MIT, Apache-2.0."
+          },
+          "url": {
+            "type": "string"
+          },
+          "notice": {
+            "type": "string",
+            "description": "Notice is what must accompany what was made: attribution, terms on the output, what the weights were trained on."
+          },
+          "commercial": {
+            "type": "boolean",
+            "description": "Commercial says whether what is made may be used commercially: nil is not said, which is not the same as yes."
+          },
+          "excluded_regions": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "ExcludedRegions are where the licence grants nothing: ISO 3166 codes, and EU for the union (Hunyuan's: EU, UK, KR)."
+          },
+          "revenue_cap_usd": {
+            "type": "integer",
+            "format": "int64",
+            "description": "RevenueCapUSD is the yearly revenue above which the licence asks for another agreement (Stability's community licence: 1000000). Zero is none."
+          },
+          "attribution": {
+            "type": "string",
+            "description": "Attribution is what a product using the output must show: \"Powered by Stability AI\"."
+          }
+        }
+      },
       "catalog.Model": {
         "type": "object",
         "description": "Model is a catalog entry as clients see it.",
@@ -8667,6 +9227,14 @@
             "$ref": "#/components/schemas/catalog.External",
             "description": "External is a model served by someone else — an OpenAI-compatible API outside the cluster — rather than by replicas placed here. Such a model has no profiles and nothing is placed for it; the router sends its requests to the provider. Most useful named in another model's fallbacks: used only when the cluster has no capacity left. Its prompts leave the cluster, so which keys may name it is worth an allowlist."
           },
+          "comfyui": {
+            "$ref": "#/components/schemas/catalog.ComfyUI",
+            "description": "ComfyUI is how a model whose profiles run engine comfyui makes its pictures: the workflow, and the file it loads."
+          },
+          "license": {
+            "$ref": "#/components/schemas/catalog.License",
+            "description": "License is the terms of what the model makes, for a model whose output somebody ships: shown with every result and written into a mesh."
+          },
           "adapters": {
             "type": "array",
             "items": {
@@ -8710,6 +9278,10 @@
             "$ref": "#/components/schemas/catalog.Capabilities",
             "description": "Capabilities is what this model can do beyond plain completion."
           },
+          "query_prefix": {
+            "type": "string",
+            "description": "QueryPrefix is put before a question an embedding model embeds for a knowledge-base search; documents are embedded without it. Models trained with an instruction on the query side want it, Qwen3-Embedding \"Instruct: Given a web search query, retrieve relevant passages that answer the query\\nQuery: \" for one."
+          },
           "role": {
             "type": "string",
             "description": "Role \"guard\" is a model that judges the gateway's traffic for the guardrails rather than serving clients: hidden from /v1/models and the chat page, refused to any key that names it, critical by default, and always running. Guard says how its answers are read."
@@ -8720,6 +9292,10 @@
           "origin": {
             "$ref": "#/components/schemas/catalog.Origin",
             "description": "Origin is the registry repository the weights came from, at which commit, and each file's checksum there. Written when a model is served from the registry; for one that was not, worked out from the mirror's record of where it fetched the file. It is what lets the control plane say that the repository has published different weights since, and move the model to them."
+          },
+          "shared": {
+            "$ref": "#/components/schemas/catalog.SharedComfy",
+            "description": "Shared is set on an environment's hidden entry only: the members its replica answers for. Made by the catalog, never written."
           }
         }
       },
@@ -8799,6 +9375,10 @@
           "gpu_class": {
             "type": "string"
           },
+          "source": {
+            "type": "string",
+            "description": "Source is the weights this profile loads, when not the model's: an embedding model served by vLLM from its repository on a card and by llama.cpp from a GGUF on CPUs is one model with two sources. Empty loads the model's. Updates and canaries move the model's source; a profile with its own keeps it."
+          },
           "tp": {
             "type": "integer"
           },
@@ -8868,6 +9448,32 @@
           "kv_events": {
             "type": "boolean",
             "description": "KVEvents has vLLM publish what its prefix cache holds, and the router route this model's requests by it: to the replica holding the most of a prompt's leading blocks (plan §7.5 tier 2). vLLM only.\n\nOff by default, because it costs something on every request: the router asks a replica to tokenize the prompt before placing it, a round trip and the chat template run twice. It pays where prompts share long prefixes that the approximate tree guesses wrong — many replicas, conversations that move between them, evictions. The engine is started with sha256_cbor block hashing and a fixed PYTHONHASHSEED, which the router's hashing assumes; arguments overriding either leave the index empty, and the agent says so in its log."
+          },
+          "gpu": {
+            "$ref": "#/components/schemas/catalog.GPUNeed",
+            "description": "GPU says what card the profile needs, in place of naming its class: it stands for every class in the cluster that meets it. A catalog entry written once then places sensibly on any site's cards."
+          },
+          "comfyui": {
+            "$ref": "#/components/schemas/catalog.ProfileComfyUI",
+            "description": "ComfyUI is this profile's own workflow, checkpoint and nodes, over the model's: an fp8 workflow where the card has fp8, fp16 where it has not."
+          }
+        }
+      },
+      "catalog.ProfileComfyUI": {
+        "type": "object",
+        "description": "ProfileComfyUI is what a ComfyUI profile runs differently from the model: each field set replaces the model's.",
+        "properties": {
+          "workflow": {
+            "type": "string"
+          },
+          "checkpoint": {
+            "type": "string"
+          },
+          "nodes": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/catalog.CustomNode"
+            }
           }
         }
       },
@@ -8943,6 +9549,51 @@
           }
         }
       },
+      "catalog.SharedComfy": {
+        "type": "object",
+        "description": "SharedComfy is what an environment's entry carries of its members.",
+        "properties": {
+          "environment": {
+            "type": "string"
+          },
+          "members": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/catalog.SharedMember"
+            }
+          }
+        }
+      },
+      "catalog.SharedMember": {
+        "type": "object",
+        "description": "SharedMember is one model a shared replica answers for.",
+        "properties": {
+          "name": {
+            "type": "string"
+          },
+          "aliases": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          },
+          "source": {
+            "type": "string",
+            "description": "Source is the member's weights, which the replica's node fetches."
+          },
+          "hf_repo": {
+            "type": "string",
+            "description": "HFRepo is the repository its node loads the weights by name from."
+          },
+          "workflow": {
+            "type": "string",
+            "description": "Workflow and Checkpoint are what a request for it is sent."
+          },
+          "checkpoint": {
+            "type": "string"
+          }
+        }
+      },
       "eval.Live": {
         "type": "object",
         "description": "Live is a run as it stands: one running, with how many of its cases are done, or one finished.",
@@ -9811,6 +10462,10 @@
             "type": "boolean",
             "description": "Tools says the model makes tool calls the engine returns as calls: it is written into the catalog, where clients and editors read it. Check a running replica with llmgw ctl tool-check before saying so."
           },
+          "embeddings": {
+            "type": "boolean",
+            "description": "Embeddings serves it as an embedding model, which its GGUF header says by itself for most: --embedding, many slots, a batch that holds a whole passage, /v1/embeddings."
+          },
           "cpu_cores": {
             "type": "integer",
             "description": "CPUCores is what a replica computes on; zero takes half the smallest node it fits on."
@@ -10250,6 +10905,14 @@
           "CostMicros": {
             "type": "integer",
             "format": "int64"
+          },
+          "Images": {
+            "type": "integer",
+            "format": "int64"
+          },
+          "Meshes": {
+            "type": "integer",
+            "format": "int64"
           }
         }
       },

docs/clients.md

@@ -38,6 +38,14 @@ export ANTHROPIC_BASE_URL=https://llm.example.com
 export ANTHROPIC_API_KEY=$LLMGW_API_KEY
 ```
 
+### The API described
+
+Every endpoint is described in OpenAPI 3.1 at `/v1/openapi.json`. It needs
+no key, so a client generator can be pointed at it. `/docs/api` shows it in
+Swagger UI, where *Authorize* takes a key and *Try it out* sends a request to
+the gateway. People with a part in running the gateway also find the admin
+API's document there.
+
 ## A first request
 
 ### curl
@@ -526,6 +534,64 @@ curl https://llm.example.com/mcp \
   -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/list"}'
 ```
 
+**Pictures, 3D models, vision and workflows.** Where the gateway has the
+models for them, the same server offers more tools — only those it has a
+model for:
+
+| Tool | Does |
+|---|---|
+| `generate_image` | A picture from a prompt. `style` adds what a picture for a mesh wants: `concept` (one object, three-quarter view, grey background), `side` (an exact side view), `texture` (a seamless tile) or `none`. Answers the PNG's `file_id`, `url` and `seed`, with a 512 px preview to look at. |
+| `generate_mesh` | A GLB from a picture — `image` is a `file-…` id (a `generate_image` result, say), a data URL or base64 — or from a `prompt`, for which a concept picture is made first. `seed`, `resolution`, `texture_resolution`, and any other input the model's workflow declares in `inputs`. Answers the GLB's `file_id`, `url` and licence. |
+| `review_images` | Asks a vision model about one to four pictures (each shrunk to 1280 px on its long side); `json_schema` makes it answer that JSON. |
+| `run_workflow` | Runs a ComfyUI workflow from the inputs its catalog entry declares, and answers its result file. |
+| `job_status` | Where a mesh or a workflow run stands, and its file when done; `wait_seconds` waits for it. |
+| `gateway_status` | The picture, 3D, vision and workflow models, whether each is loaded on a GPU now, a workflow's inputs, and your last jobs. |
+
+Each tool makes its request of the gateway under your key, so your
+allowlist, limits, left-out licences and budget apply, and it is charged
+and listed like any other request. What it makes is kept as your file for
+as long as job results are: fetch it from `url` with the same key (`curl -H
+"Authorization: Bearer $LLMGW_API_KEY" -o rock.glb <url>`). A tool server
+over HTTP cannot write to your disk, so an agent that needs the file
+locally — to import it in Blender — fetches it, or goes through a small
+local bridge that does.
+
+A picture can be uploaded once and named by its id after: `POST /v1/files`
+with `purpose=vision` (or `user_data`) keeps it, for as long as job results
+are kept, as a file of yours that `generate_mesh`, `review_images` and a
+workflow's file inputs take as `file-…`. A call is at most 64 MB.
+
+A model that is not loaded is waited for: a picture or a look at one whose
+model is starting, or waiting for another to give up the GPU, waits as a
+mesh does, saying so, rather than failing with "model loading".
+
+A mesh takes from half a minute to a few minutes. A client that takes the
+answer as a stream (`Accept: text/event-stream`, as Claude Code does) is
+answered that way: `notifications/progress` for the call's
+`progressToken` while it runs — queued, waiting for the GPU, the node and
+its percent — then the result, and the call waits up to ten minutes. One
+answered in one piece waits 50 seconds; a job not done by then is answered
+with its `job_id`, to ask after with `job_status`. `wait_seconds` (up to
+900) sets either.
+
+```
+claude mcp add --transport http llmgw https://llm.example.com/mcp \
+  --header "Authorization: Bearer $LLMGW_API_KEY"
+```
+
+### Licences you leave out
+
+A model's licence is in `/v1/models` (`license`: its `id`, `name`, whether
+it allows commercial use and the regions it grants nothing in). On your
+profile page, under **Licences**, you can leave licences out: one by one,
+every licence that forbids commercial use, or every licence that grants
+nothing in a region you name (`EU` for the union). The rules cover models
+added later too. From then on those models are not listed to your keys and
+a request for one is refused with 403 and the code `licence_excluded`,
+naming the choice that left it out — on every key you own and on the
+portal's pages, whatever a key's own allowlist says. A change reaches keys
+already in use within a minute.
+
 ### Headers llmgw sends back
 
 | Header | Says |
@@ -545,9 +611,10 @@ its usual exception with the gateway's message in it. The ones worth knowing:
 |---|---|
 | 400 | Besides a malformed request: a prompt too long for the model, or a guardrail policy refused it (the code `content_policy_violation`). |
 | 401 | No key, a mistyped one, or one that was revoked or has expired. |
-| 403 | The key may not use that model. |
+| 403 | The key may not use that model; with the code `licence_excluded`, its licence is one you left out on your profile page. |
 | 429 | A rate limit or budget of the key, its project or its team was reached. `Retry-After` says when to try again, and is absent when waiting will not help — a spent monthly budget. |
-| 503 | No model of that name is served (the message lists the ones that are), the model is still loading, or every replica is busy and the request waited as long as it may. The SDKs retry by themselves; a name that is not served will not start to be. |
+| 503 | No model of that name is served (the message lists the ones that are), the model is still loading, or every replica is busy and the queue is full. The SDKs retry by themselves; a name that is not served will not start to be. |
+| 504 | Every replica was busy for as long as the key's band may wait. `Retry-After` says when to send it again. |
 
 ## Priority
 

docs/install.md

@@ -1038,6 +1038,27 @@ qwen2.5-coder-3b-instruct  yes      1/1       ready    coder
 No restart, and it survives one: models added this way are stored, while
 anything in `server.yaml` is declarative and returns on every start.
 
+A profile may load weights of its own. An embedding model, for example, can
+be served by vLLM from its repository on a card and by llama.cpp from a GGUF
+on CPUs, as one model:
+
+```yaml
+name: qwen3-embed-4b
+source: Qwen/Qwen3-Embedding-4B          # what a profile loads unless it says
+capabilities: { embeddings: true }
+profiles:
+  - name: gpu
+    engine: vllm
+    gpu_class: 6000-24g
+    args: ["--runner", "pooling"]
+  - name: cpu
+    engine: llamacpp
+    source: hf:Qwen/Qwen3-Embedding-4B-GGUF/Qwen3-Embedding-4B-Q8_0.gguf
+```
+
+Updates and canaries move the model's `source`; a profile with its own keeps
+it.
+
 ### Models that load when someone asks
 
 A cluster with more models than GPUs can hold every model in its catalog and
@@ -1270,6 +1291,161 @@ prices and budgets, rate limits, usage records, and key allowlists.
 whose allowlist leaves the external model out cannot reach it, as a fallback or
 by name. The cluster page and `ctl models` mark it `external`.
 
+### Pictures from ComfyUI
+
+Clients ask for pictures at OpenAI's `/v1/images/generations`. llmgw has them
+made by ComfyUI: it fills a ComfyUI workflow with the request, queues it,
+waits, and sends the pictures back as `b64_json`.
+
+**On the cluster's own cards.** Use engine `comfyui`. The model is placed on a
+GPU node like any other, started when asked for, and stopped when unused.
+
+**The short way: a preset.** Some models come with llmgw, with their
+workflow, custom nodes, packages and licence already found and tried:
+
+```
+llmgw ctl model presets
+llmgw ctl model add flux-schnell     # pictures, Apache 2.0, a card of 24 GB, Volta or newer
+llmgw ctl model add triposr          # 3D models from a picture, MIT, a card of 8 GB
+```
+
+A preset's profile says the card it needs, not a class, so it places on
+whatever cards the site has. When the cluster's settings name no ComfyUI,
+adding one sets `engines.comfyui` to the version this release installs, and
+every node with an NVIDIA GPU installs it; a cluster that names a version,
+or `""` for none, keeps it; the control planes then start again on that
+setting, standbys first.
+
+They also come by themselves. Once a node has a card that fits one, and the
+catalog has nothing that makes what it makes, the leader adds it, on demand —
+where the cluster already installs ComfyUI; it never sets `engines.comfyui`
+by itself. A preset somebody removes stays out until it is added again.
+`llmgw ctl model presets auto off` (the setting `presets.auto`) stops it.
+
+The cluster page on the portal has a **Pictures and 3D models** card under
+the models: each preset, the classes of card here it fits, whether it is in
+the catalog and who added it, why the leader has not, an **Add** button (one
+that would also install ComfyUI says so first) and the switch for adding
+them by themselves. In the console, the models screen shows the same: **A**
+adds one, **P** turns adding them by themselves on or off.
+`llmgw ctl model presets` prints it. The rest of this section is for a model
+of your own.
+
+The node must offer the engine. Ask for it in the cluster's settings, and every
+node with an NVIDIA GPU installs it:
+
+```
+llmgw ctl config set engines.comfyui 0.39.2
+```
+
+The agent fetches ComfyUI's source from GitHub and checks it against the
+digest llmgw holds for that version. GitHub publishes none for a tag's archive,
+so a version llmgw does not know is refused. The agent then builds a Python
+environment beside the source, under `/opt/llmgw/engines/comfyui/`. Its
+dependencies are resolved as PyPI stood the day after the release. torch comes
+from PyPI (CUDA 13), from PyTorch's CUDA 12.9 build where the driver is older
+than 580, or from its CUDA 12.6 build on cards older than Turing (a V100):
+torch's CUDA 12.8 and newer builds have no kernels for them. The install is
+checked on the node's GPU, and takes about 10 GB.
+`engine_overrides` can keep it off nodes that should not have it.
+
+Alternatively, install ComfyUI by hand. You need a directory with `main.py` and
+its environment in `.venv`, readable by the user engines run as
+(`llmgw-engine`). Name it in that node's `agent.yaml`; a node with one named
+there is not given the installed one:
+
+```yaml
+engines:
+  comfyui:
+    dir: /opt/comfyui            # python: defaults to /opt/comfyui/.venv/bin/python
+```
+
+Then add the model:
+
+```yaml
+- name: flux-schnell
+  source: hf:Comfy-Org/flux1-schnell/flux1-schnell-fp8.safetensors
+  comfyui:
+    workflow: flux-schnell       # or flux-dev, or a JSON file
+  scaling: {min: 0, max: 1, idle_timeout: 15m}
+  profiles:
+    - name: gpu
+      engine: comfyui
+      gpu_class: 6000-24g
+      tp: 1
+```
+
+The source is fetched as for any model. It can be one file, such as the
+single-file checkpoints the built-in workflows load. It can also be a mirror
+set (a URL ending in `/`) for a model in several files, such as a diffusion
+model, its text encoders and its VAE. ComfyUI sees every file of a set by its
+own name, so a workflow of your own can load each one. A set must name the
+file that `{{checkpoint}}` stands for in `comfyui.checkpoint`. A single file
+is named by its own file name.
+
+ComfyUI asks nobody for a key. The agent therefore starts it behind a gate
+(`llmgw comfyui-gate`). ComfyUI listens on the node's loopback only. The gate
+listens on the replica's port, demands the replica's key, and lets through only
+what the router asks: queueing, waiting, fetching a picture and cancelling.
+Uploads and node installs are refused. Each replica has its own directory,
+`~llmgw-engine/comfyui/REPLICA`, and ComfyUI's output can be read with `llmgw
+ctl logs NODE --source SHARD`. A profile's `args` go to `main.py`.
+`--disable-smart-memory` frees the card between pictures, at the cost of loading
+the model again for each one.
+
+**On a ComfyUI server outside the cluster.** Make it an external model with
+`api: comfyui`:
+
+```yaml
+- name: flux-schnell
+  source: external
+  external:
+    url: http://10.0.0.147:8188                  # ComfyUI, started with --listen
+    model: flux1-schnell-fp8.safetensors         # the checkpoint, as ComfyUI lists it
+    api: comfyui
+    workflow: flux-schnell                       # or flux-dev, or a JSON file
+```
+
+Like any external model, its requests count as leaving the cluster.
+
+`flux-schnell` (the default) and `flux-dev` are built in. They suit the
+single-file FLUX checkpoints that ComfyUI loads with `CheckpointLoaderSimple`.
+For any other model, export the workflow from ComfyUI with **Save (API)** and
+name the file. In the file, put placeholders where the request's values go:
+
+- `{{prompt}}` and `{{negative_prompt}}` are the prompts.
+- `{{width}}` and `{{height}}` are the size.
+- `{{n}}` is the batch size.
+- `{{seed}}` is the seed.
+- `{{steps|4}}` and `{{guidance|3.5}}` take the value after the `|` when the
+  request leaves them out.
+- `{{checkpoint}}` is the `model` above.
+
+A request is OpenAI's: `prompt`, `n` (at most 4), `size` (each side a multiple
+of 16, from 256 to 2048) and `response_format: b64_json`. Beyond those, it may
+send `seed`, `steps`, `negative_prompt` and `guidance`. The seed used comes
+back in `x-llmgw-seed`. `url` is not offered, because pictures are kept
+nowhere. ComfyUI also writes the workflow into each PNG; llmgw strips it
+before the picture is sent.
+
+Requests for pictures pass the same checks as any other request: keys,
+allowlists, limits, admission, and the guardrails on the prompt. A client that
+leaves takes its workflow off the ComfyUI queue.
+
+Each request's usage row records how many pictures it made (`llmgw ctl request
+ID` shows them). A picture's price is set with `per_image`, in micro-units like
+the other prices, and is charged on top of the prompt's tokens:
+
+```yaml
+auth:
+  pricing:
+    flux-schnell: {prompt_per_1k: 0, per_image: 20000}
+```
+
+An external ComfyUI on a card that llmgw also places models on should be
+started with `--disable-smart-memory`. Without it, ComfyUI keeps the model on
+the card after each picture, and llmgw sees that memory as somebody else's.
+
 ### Federating clusters
 
 Another llmgw cluster — another site, another team's GPUs — can be a provider
@@ -1550,6 +1726,7 @@ and accounting exactly as an API call does.
 | `POST /v1/audio/transcriptions`, `/v1/audio/translations` | the multipart form passed through as it came, to an engine that serves speech to text: vLLM with Whisper |
 | `POST /v1/moderations` | answered by the guardrails' judge model (`role: guard`): `flagged`, and the judge's own categories |
 | `/v1/files`, `/v1/batches` | batches; see [Batches](#batches) |
+| `/v1/3d/generations` | 3D models, as jobs asked after; see [Jobs](#jobs-3d-models) |
 | `GET /v1/models` | the models this key may use |
 
 ## Watching it
@@ -1650,6 +1827,23 @@ same event about the same thing is sent at most once an hour, so a budget that
 refuses a thousand requests is one message. `llmgw ctl notify test` sends a
 test event to each webhook and says how each answered.
 
+Setup asks for them: **Notification webhooks** on its first page, or
+`--webhook` to `llmgw server init`, as often as there are webhooks:
+
+```
+sudo llmgw server init --admin ops@example.com \
+  --webhook https://hooks.slack.com/services/… \
+  --webhook json:https://ops.example.com/llmgw
+```
+
+An address of Slack's, or one with `/hooks/` in it (Mattermost, Rocket.Chat)
+or ending in `/slack`, is sent Slack's `{"text": …}`; any other the event as
+JSON; `slack:` or `json:` in front says which. They are added to the
+cluster's settings beside any already there — run again, nothing is added
+twice — and once the control plane runs on them, each is sent a test, whose
+answer setup prints. Events to choose and a signing secret are set in the
+settings afterwards (`llmgw ctl config edit`).
+
 ### Tracing
 
 Metrics say that a model took four minutes to start; a trace says where they
@@ -1908,6 +2102,142 @@ Each line of the file is `{"custom_id": …, "method": "POST", "url":
   or past their retention — a project under a guardrails policy with
   `no_store` is refused it.
 
+## Jobs: 3D models
+
+A 3D model from a picture takes minutes on a card that first has to be
+emptied of whatever else was on it. No client should hold a connection for
+that, so it is a job: queued, answered with an id, asked after, its result
+downloaded.
+
+```
+curl http://gateway:8080/v1/3d/generations -H "Authorization: Bearer $LLMGW_API_KEY" \
+  -d '{"model": "trellis2", "image": "<base64>"}'
+# → 202 {"id": "job_…", "status": "queued", …}
+curl http://gateway:8080/v1/3d/generations/job_… -H "Authorization: Bearer $LLMGW_API_KEY"
+# → {"status": "completed", "output_file_id": "file-…", "content_type": "model/gltf-binary", "usage": {…}}
+curl http://gateway:8080/v1/files/file-…/content -H "Authorization: Bearer $LLMGW_API_KEY" -o model.glb
+curl -X POST http://gateway:8080/v1/3d/generations/job_…/cancel -H "Authorization: Bearer $LLMGW_API_KEY"
+```
+
+- **Status:** `queued`, `running`, `completed`, `failed` (with `error`),
+  `cancelling`, `cancelled`, `expired` (not finished within 24 h).
+  `progress` carries what the engine said of the work so far, once it says
+  anything; `GET /v1/3d/generations` lists the caller's jobs. While the
+  model waits for another on-demand model to give up the card,
+  `progress` is `{"state":"waiting_gpu","held_by":"flux-schnell","eta_seconds":N}`:
+  N is when the holder is stopped (idle and old enough to evict, or at its
+  idle timeout) plus how long the model's last start took, and is left out
+  when that is not known. A request made directly gets the same as a 503
+  with `X-Llmgw-Waiting-For`, `X-Llmgw-Eta-Seconds` and `Retry-After`.
+- **Refused at the door:** no key, a model that is not there or not in the
+  key's allowlist, a request the model cannot serve. Refused when served,
+  and said as the job's error: a spent budget, the guardrails, a model
+  that will not come up.
+- **How it is served:** the request is kept as it was sent and replayed by
+  whichever gateway holds the job's lease, through the same path a
+  client's request takes — limits, admission in the key's band, guardrails,
+  accounting — by the leading control plane, since a standby has nothing
+  to send it to. A model said to fit nowhere is asked for again for five
+  minutes before that is the job's error: an agent re-registering says so
+  for a few seconds. It is one usage record under the job's id, tagged
+  `job=<id>`, charged like any request; `GET` shows the usage once it is
+  done. A model still loading, a rate limit or a full queue is waited out
+  for as long as the job has: nobody is holding a connection, which is the
+  point.
+- **Surviving a restart:** a gateway that stops hands its jobs to another
+  within two minutes; a job it was running is run again from the start.
+- **What it keeps:** the request as sent, and the result as a file owned
+  by the key's project, kept `router.batch.retain_days` (30) like a batch's
+  files; the job's record goes with it. A project under a `no_store`
+  policy is refused jobs, as it is batches.
+
+A request may also send `seed` and `resolution` (the model's own grid, a
+multiple of 32 from 64 to 2048). The picture should show one object on a
+plain background: the model makes a mesh of what it sees, background
+included.
+
+### A model that makes them
+
+A 3D model is made by a ComfyUI model whose `comfyui.output` is `meshes`
+(see [Pictures from ComfyUI](#pictures-from-comfyui) for engine `comfyui`).
+Its workflow is a JSON file in ComfyUI's API format: `{{image}}` is the
+uploaded picture, which a `LoadImage` node reads; `{{seed}}`,
+`{{resolution|256}}` and `{{checkpoint}}` are as for pictures. The node that
+saves the mesh may save a GLB or an OBJ; an OBJ leaves the gateway as a GLB,
+vertex colours kept.
+
+TripoSR (MIT), on any card of 8 GB, comes with llmgw: `llmgw ctl model add
+triposr`. What that adds is this entry, and its workflow is built in:
+
+```yaml
+- name: triposr
+  source: hf:stabilityai/TripoSR/model.ckpt
+  comfyui:
+    workflow: triposr              # built in; a model of your own names a JSON file on every control plane
+    output: meshes
+    nodes:
+      - repo: https://github.com/flowtyone/ComfyUI-Flowty-TripoSR
+        commit: a0c94ac60a7cc062604f61aeeea6d0d493521de3
+        requirements: [omegaconf, trimesh, scikit-image, imageio,
+                       "transformers>=4.50.3,<5", "huggingface-hub<1", tokenizers,
+                       rembg, onnxruntime]
+  license:
+    id: MIT
+    name: MIT
+    commercial: true
+    url: https://huggingface.co/stabilityai/TripoSR/blob/main/LICENSE
+    notice: "Made with TripoSR (Stability AI and Tripo AI, MIT). ..."
+  scaling: {min: 0, max: 1, idle_timeout: 10m}
+  profiles:
+    - {name: gpu, engine: comfyui, tp: 1, gpu: {min_compute_capability: 7.0, min_memory_gb: 8}}
+```
+
+```json
+{
+  "1": {"class_type": "LoadImage", "inputs": {"image": "{{image}}"}},
+  "5": {"class_type": "LLMGWPrepareForMesh", "inputs": {"image": ["1", 0], "mask": ["1", 1],
+        "foreground_ratio": 0.85, "background": 0.5, "remove_background": "auto", "rembg_model": "u2net"}},
+  "2": {"class_type": "TripoSRModelLoader", "inputs": {"model": "{{checkpoint}}", "chunk_size": 8192}},
+  "3": {"class_type": "TripoSRSampler", "inputs": {"model": ["2", 0], "reference_image": ["5", 0],
+        "geometry_resolution": "{{resolution|256}}", "threshold": 25.0}},
+  "4": {"class_type": "TripoSRViewer", "inputs": {"mesh": ["3", 0]}}
+}
+```
+
+`LLMGWPrepareForMesh` comes with the gate: it cuts the object out — by the
+picture's alpha, or by rembg where it has none — and centres it on a plain
+background, without which the background becomes geometry.
+
+- **Custom nodes** are named by https repository and full commit (a branch
+  is refused: it moves). The gate puts each in the replica's own
+  `custom_nodes` and installs its `requirements` beside the replica, never
+  into ComfyUI's environment. A package named there is installed at the
+  range named; every other one at the version ComfyUI already runs. A
+  package named is first on ComfyUI's path, so its range must suit ComfyUI
+  as well. TripoSR's checkpoint loads with transformers 4, which ComfyUI's
+  `>=4.50.3` allows.
+- **Progress:** the gate listens to ComfyUI's websocket and the router
+  writes what it hears into the job: `{"state": "queued", "ahead": 2}`,
+  then `{"state": "running", "node_class": "KSampler", "step": 12,
+  "steps": 30, "percent": 40}` for a node that counts its steps, and
+  `done` at the end.
+- **Licence:** a model's `license` is shown in `/v1/models`, in the job and
+  on the portal, and written into the GLB's `asset.extras.license`, since
+  the file travels without the API. Choose the model for its licence before
+  its quality when what it makes is shipped. TRELLIS.2 needs Meta's gated
+  DINOv3 and, as published, a background remover under a non-commercial
+  licence; Hunyuan3D's licence excludes the EU, the UK and South Korea.
+- **Price:** `per_mesh` in `auth.pricing`, beside `per_image`; each usage
+  row says how many meshes it made (`meshes`).
+- **Cards:** the strongest models today (TRELLIS.2, Direct3D-S2) need
+  flash-attention, which runs on Ampere and newer. A Turing card such as
+  the RTX 6000 runs TripoSR.
+
+People make them at `/3d` on the portal: they choose a picture and watch
+the job, and the mesh is shown in a viewer (model-viewer, served from the
+gateway) with a download link and the licence. `llmgw ctl 3d list`, `get`
+and `cancel` show and stop every owner's jobs.
+
 ## Conversations across models
 
 Off everywhere until a project asks. llmgw otherwise stores no message content

docs/knowledge.md

@@ -45,6 +45,15 @@ is available to everyone who may use them.
   A collection stays with the model it was made with: vectors from two
   models cannot be compared.
 
+  Some embedding models are trained with an instruction before the
+  question and none before the documents. Give it as the entry's
+  `query_prefix`; llmgw puts it before questions only. For
+  Qwen3-Embedding:
+
+  ```yaml
+  query_prefix: "Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: "
+  ```
+
   With pgvector 0.7 or later a collection's index is kept at half
   precision (`halfvec`), which halves its memory and takes models of up to
   4000 dimensions; with an older pgvector the limit is 2000. A collection
@@ -137,6 +146,24 @@ Rules that apply:
 - Every document added or removed is in the audit log (`llmgw ctl audit`),
   by name. The text is never recorded.
 
+### A large import
+
+A few thousand documents ask the embedding model for far more than it can
+answer at once. Give the key that sends them a band of its own, below the
+people's, that may wait for room for minutes rather than the 30 seconds the
+others wait:
+
+```sh
+llmgw ctl config set router.admission.bands '[{name: gold, priority: 300, saturation_ceiling: 0.85},
+  {name: bronze, priority: 100, saturation_ceiling: 0.3}, {name: bulk, priority: 50, saturation_ceiling: 0.3, queue_ttl: 5m}]'
+llmgw keys create import --project Acme/docs --band bulk
+```
+
+The people's questions then go first, and the import waits behind them. A
+request that waits as long as its band allows is answered 504 with
+`Retry-After`, and `llmgw-kb` sends it again rather than counting the
+passage as failed. It gives up after 15 minutes.
+
 ## For everyone: `llmgw-kb`
 
 ### Get it

docs/reference.md

@@ -60,6 +60,17 @@ rather than repeated.
 | `tools` | `bool` | [Capabilities](#capabilities) |
 | `vision` | `bool` | [Capabilities](#capabilities) |
 | `embeddings` | `bool` | [Capabilities](#capabilities) |
+| `images` | `bool` | [Capabilities](#capabilities) |
+| `meshes` | `bool` | [Capabilities](#capabilities) |
+| `workflow` | `string` | [ComfyUI](#comfyui) |
+| `checkpoint` | `string` | [ComfyUI](#comfyui) |
+| `output` | `string` | [ComfyUI](#comfyui) |
+| `inputs` | `[]Input` | [ComfyUI](#comfyui) |
+| `nodes` | `[]CustomNode` | [ComfyUI](#comfyui) |
+| `huggingface_repo` | `string` | [ComfyUI](#comfyui) |
+| `environment` | `string` | [ComfyUI](#comfyui) |
+| `dir` | `string` | [ComfyUIConfig](#comfyuiconfig) |
+| `python` | `string` | [ComfyUIConfig](#comfyuiconfig) |
 | `interval` | `time.Duration` | [Control](#control) |
 | `base_backoff` | `time.Duration` | [Control](#control) |
 | `max_backoff` | `time.Duration` | [Control](#control) |
@@ -71,11 +82,16 @@ rather than repeated.
 | `eval_dir` | `string` | [Control](#control) |
 | `enabled` | `bool` | [Control](#control) |
 | `lease_ttl` | `time.Duration` | [Control](#control) |
+| `repo` | `string` | [CustomNode](#customnode) |
+| `commit` | `string` | [CustomNode](#customnode) |
+| `requirements` | `[]string` | [CustomNode](#customnode) |
+| `build` | `[]string` | [CustomNode](#customnode) |
 | `id` | `string` | [Endpoint](#endpoint) |
 | `url` | `string` | [Endpoint](#endpoint) |
 | `api_key` | `string` | [Endpoint](#endpoint) |
 | `models` | `[]string` | [Endpoint](#endpoint) |
 | `engine` | `string` | [Endpoint](#endpoint) |
+| `workflow` | `string` | [Endpoint](#endpoint) |
 | `pool` | `string` | [Endpoint](#endpoint) |
 | `weight` | `float64` | [Endpoint](#endpoint) |
 | `priority` | `int` | [Endpoint](#endpoint) |
@@ -90,6 +106,9 @@ rather than repeated.
 | `model` | `string` | [External](#external) |
 | `api_key_file` | `string` | [External](#external) |
 | `peer` | `string` | [External](#external) |
+| `api` | `string` | [External](#external) |
+| `workflow` | `string` | [External](#external) |
+| `output` | `string` | [External](#external) |
 | `budgets` | `[]FacilityBudget` | [Facility](#facility) |
 | `margin` | `float64` | [Facility](#facility) |
 | `gpu_watts` | `float64` | [Facility](#facility) |
@@ -102,8 +121,19 @@ rather than repeated.
 | `name` | `string` | [Federation](#federation) |
 | `interval` | `time.Duration` | [Federation](#federation) |
 | `enabled` | `bool` | [FirewallSettings](#firewallsettings) |
+| `min_compute_capability` | `float64` | [GPUNeed](#gpuneed) |
+| `min_memory_gb` | `int` | [GPUNeed](#gpuneed) |
 | `format` | `string` | [GuardModel](#guardmodel) |
 | `categories` | `[]string` | [GuardModel](#guardmodel) |
+| `name` | `string` | [Input](#input) |
+| `type` | `string` | [Input](#input) |
+| `required` | `bool` | [Input](#input) |
+| `default` | `any` | [Input](#input) |
+| `min` | `*float64` | [Input](#input) |
+| `max` | `*float64` | [Input](#input) |
+| `choices` | `[]string` | [Input](#input) |
+| `max_mb` | `int` | [Input](#input) |
+| `doc` | `string` | [Input](#input) |
 | `model` | `string` | [JudgePolicy](#judgepolicy) |
 | `models` | `[]string` | [JudgePolicy](#judgepolicy) |
 | `input` | `string` | [JudgePolicy](#judgepolicy) |
@@ -118,6 +148,14 @@ rather than repeated.
 | `notice` | `string` | [Landing](#landing) |
 | `language` | `string` | [Landing](#landing) |
 | `docs_sign_in` | `bool` | [Landing](#landing) |
+| `id` | `string` | [License](#license) |
+| `name` | `string` | [License](#license) |
+| `url` | `string` | [License](#license) |
+| `notice` | `string` | [License](#license) |
+| `commercial` | `*bool` | [License](#license) |
+| `excluded_regions` | `[]string` | [License](#license) |
+| `revenue_cap_usd` | `int64` | [License](#license) |
+| `attribution` | `string` | [License](#license) |
 | `bin` | `string` | [LlamaCppConfig](#llamacppconfig) |
 | `parallel` | `int` | [LlamaCppConfig](#llamacppconfig) |
 | `threads` | `int` | [LlamaCppConfig](#llamacppconfig) |
@@ -135,6 +173,8 @@ rather than repeated.
 | `class` | `string` | [Model](#model) |
 | `owner` | `string` | [Model](#model) |
 | `external` | `*External` | [Model](#model) |
+| `comfyui` | `*ComfyUI` | [Model](#model) |
+| `license` | `*License` | [Model](#model) |
 | `adapters` | `[]Adapter` | [Model](#model) |
 | `max_loaded_adapters` | `int` | [Model](#model) |
 | `fallbacks` | `[]string` | [Model](#model) |
@@ -145,6 +185,7 @@ rather than repeated.
 | `context_length` | `int` | [Model](#model) |
 | `max_output` | `int` | [Model](#model) |
 | `capabilities` | `Capabilities` | [Model](#model) |
+| `query_prefix` | `string` | [Model](#model) |
 | `role` | `string` | [Model](#model) |
 | `guard` | `*GuardModel` | [Model](#model) |
 | `origin` | `*Origin` | [Model](#model) |
@@ -164,6 +205,8 @@ rather than repeated.
 | `no_passwords` | `bool` | [OIDC](#oidc) |
 | `mirror` | `string` | [Offline](#offline) |
 | `checksums` | `string` | [Offline](#offline) |
+| `evict_after_idle` | `time.Duration` | [OnDemandSettings](#ondemandsettings) |
+| `min_lifetime` | `time.Duration` | [OnDemandSettings](#ondemandsettings) |
 | `nvidia_smi` | `string` | [Options](#options) |
 | `ib_root` | `string` | [Options](#options) |
 | `prefer_nvml` | `bool` | [Options](#options) |
@@ -203,6 +246,7 @@ rather than repeated.
 | `match_ratio` | `float64` | [Prefix](#prefix) |
 | `balance_abs` | `float64` | [Prefix](#prefix) |
 | `balance_rel` | `float64` | [Prefix](#prefix) |
+| `auto` | `bool` | [PresetSettings](#presetsettings) |
 | `source` | `string` | [PreviousOrigin](#previousorigin) |
 | `revision` | `string` | [PreviousOrigin](#previousorigin) |
 | `files` | `[]OriginFile` | [PreviousOrigin](#previousorigin) |
@@ -210,6 +254,7 @@ rather than repeated.
 | `engine` | `string` | [Profile](#profile) |
 | `engine_version` | `string` | [Profile](#profile) |
 | `gpu_class` | `string` | [Profile](#profile) |
+| `source` | `string` | [Profile](#profile) |
 | `tp` | `int` | [Profile](#profile) |
 | `pp` | `int` | [Profile](#profile) |
 | `gpus_per_node` | `int` | [Profile](#profile) |
@@ -226,6 +271,11 @@ rather than repeated.
 | `priority` | `int` | [Profile](#profile) |
 | `startup_timeout` | `time.Duration` | [Profile](#profile) |
 | `kv_events` | `bool` | [Profile](#profile) |
+| `gpu` | `*GPUNeed` | [Profile](#profile) |
+| `comfyui` | `*ProfileComfyUI` | [Profile](#profile) |
+| `workflow` | `string` | [ProfileComfyUI](#profilecomfyui) |
+| `checkpoint` | `string` | [ProfileComfyUI](#profilecomfyui) |
+| `nodes` | `[]CustomNode` | [ProfileComfyUI](#profilecomfyui) |
 | `activation_wait` | `time.Duration` | [Router](#router) |
 | `scrape_interval` | `time.Duration` | [Router](#router) |
 | `scrape_timeout` | `time.Duration` | [Router](#router) |
@@ -297,6 +347,8 @@ rather than repeated.
 | `mail` | `mail.Config` | [Server](#server) |
 | `serving` | `ServingSettings` | [Server](#server) |
 | `firewall` | `FirewallSettings` | [Server](#server) |
+| `presets` | `PresetSettings` | [Server](#server) |
+| `on_demand` | `OnDemandSettings` | [Server](#server) |
 | `agents` | `AgentSettings` | [Server](#server) |
 | `firewall_networks` | `[]string` | [Server](#server) |
 | `backup_recipients` | `[]string` | [Server](#server) |
@@ -342,9 +394,12 @@ rather than repeated.
 | `secret_file` | `string` | [Webhook](#webhook) |
 | `prompt_per_1k` | `int64` | [accounting.Price](#accountingprice) |
 | `completion_per_1k` | `int64` | [accounting.Price](#accountingprice) |
+| `per_image` | `int64` | [accounting.Price](#accountingprice) |
+| `per_mesh` | `int64` | [accounting.Price](#accountingprice) |
 | `name` | `string` | [admission.Band](#admissionband) |
 | `priority` | `int` | [admission.Band](#admissionband) |
 | `saturation_ceiling` | `float64` | [admission.Band](#admissionband) |
+| `queue_ttl` | `time.Duration` | [admission.Band](#admissionband) |
 | `bands` | `[]Band` | [admission.Config](#admissionconfig) |
 | `default_band` | `string` | [admission.Config](#admissionconfig) |
 | `queue_ttl` | `time.Duration` | [admission.Config](#admissionconfig) |
@@ -374,14 +429,18 @@ rather than repeated.
 | `name` | `string` | [config.Band](#configband) |
 | `priority` | `int` | [config.Band](#configband) |
 | `saturation_ceiling` | `float64` | [config.Band](#configband) |
+| `queue_ttl` | `time.Duration` | [config.Band](#configband) |
 | `prompt_per_1k` | `int64` | [config.Price](#configprice) |
 | `completion_per_1k` | `int64` | [config.Price](#configprice) |
+| `per_image` | `int64` | [config.Price](#configprice) |
+| `per_mesh` | `int64` | [config.Price](#configprice) |
 | `disabled` | `[]string` | [engines.Config](#enginesconfig) |
 | `vllm` | `VLLMConfig` | [engines.Config](#enginesconfig) |
 | `sglang` | `SGLangConfig` | [engines.Config](#enginesconfig) |
 | `llamacpp` | `LlamaCppConfig` | [engines.Config](#enginesconfig) |
 | `trtllm` | `TRTLLMConfig` | [engines.Config](#enginesconfig) |
 | `sim` | `SimConfig` | [engines.Config](#enginesconfig) |
+| `comfyui` | `ComfyUIConfig` | [engines.Config](#enginesconfig) |
 | `enabled` | `*bool` | [guard.Config](#guardconfig) |
 | `default` | `[]string` | [guard.Config](#guardconfig) |
 | `policies` | `map[string]Policy` | [guard.Config](#guardconfig) |
@@ -715,6 +774,97 @@ token is MaxTTFTRatio times this model's. Zero is 50, 0.05 and 1.5.
 
 `bool`
 
+### `images`
+
+`bool`
+
+Images is a model that makes pictures, asked for at
+/v1/images/generations. Implied by an external model whose API is
+ComfyUI's.
+
+### `meshes`
+
+`bool`
+
+Meshes is a model that makes 3D models from a picture, asked for as a
+job at /v1/3d/generations. Implied by a ComfyUI model whose output is
+meshes.
+
+## ComfyUI
+
+### `workflow`
+
+`string`
+
+Workflow is a built-in's name (flux-schnell, the default, or
+flux-dev) or a JSON file on the control plane, in ComfyUI's API
+format.
+
+### `checkpoint`
+
+`string`
+
+Checkpoint is the file the workflow's {{checkpoint}} names: the
+source's own name unless set, which a source that is a set of files
+must.
+
+### `output`
+
+`string`
+
+Output is what the workflow makes: pictures (the default), asked for
+at /v1/images/generations; meshes, asked for as a job at
+/v1/3d/generations from a picture; or video, audio or files. Every
+kind is asked for as a job at /v1/workflows/runs too.
+
+### `inputs`
+
+`[]Input`
+
+Inputs are what the workflow takes from a request at
+/v1/workflows/runs, each the placeholder of its name.
+
+### `nodes`
+
+`[]CustomNode`
+
+Nodes are custom nodes the workflow needs, put in each replica's own
+custom_nodes at the commit named.
+
+### `huggingface_repo`
+
+`string`
+
+HuggingFaceRepo is the repository a custom node loads the weights by
+name from (Stable Fast 3D's loader asks for stabilityai/stable-fast-3d):
+the replica's weights are shown to the node there, in the Hugging Face
+cache of the engines' user, so nothing is fetched and no token is
+needed when it runs.
+
+### `environment`
+
+`string`
+
+Environment names the models that may share one ComfyUI replica: every
+model of an environment agrees on the custom nodes they both name, so
+one replica can carry all of them and ComfyUI moves between their
+weights itself. Empty is an environment of the model alone.
+
+## ComfyUIConfig
+
+### `dir`
+
+`string`
+
+Dir is ComfyUI's directory, where main.py is. Readable by the user
+engines run as.
+
+### `python`
+
+`string`
+
+Python is the interpreter of its environment; Dir's .venv when unset.
+
 ## Control
 
 ### `interval`
@@ -800,6 +950,42 @@ see the claim. Long enough to survive a slow query or a brief network
 stall, short enough that a standby takes over before anyone has finished
 reading the alert. Zero takes the default.
 
+## CustomNode
+
+### `repo`
+
+`string`
+
+Repo is the repository, https only.
+
+### `commit`
+
+`string`
+
+Commit is the full commit the node is used at: a branch moves, and a
+node that changed under a model is a model that changed unasked.
+
+### `requirements`
+
+`[]string`
+
+Requirements are the PyPI packages the node needs, by name and version
+range only. They are installed beside the replica, never into
+ComfyUI's environment: a package named here at the range named, and
+every other one at the version ComfyUI already runs. One named here
+is first on ComfyUI's path, so its range must suit ComfyUI too.
+
+### `build`
+
+`[]string`
+
+Build are directories of the repository that are Python packages to
+be compiled rather than downloaded: C++ and CUDA extensions no index
+has (Stable Fast 3D's texture_baker and uv_unwrapper). Each is built
+as a wheel with ComfyUI's Python for the card the replica runs on,
+kept on the node for the next replica on the same kind of card, and
+installed beside the replica like its requirements.
+
 ## Endpoint
 
 ### `id`
@@ -828,6 +1014,13 @@ with one.
 Engine names the inference engine, which decides what its metrics are
 called. Empty means vLLM's names.
 
+### `workflow`
+
+`string`
+
+Workflow is the ComfyUI workflow for engine: comfyui, a built-in's
+name or its JSON; flux-schnell unless set.
+
 ### `pool`
 
 `string`
@@ -919,6 +1112,29 @@ a model that federation added (`llmgw ctl federation add`) rather
 than one written by hand. Such a model is named PEER/MODEL, comes and
 goes with the peer's own list, and is sent only while the peer is up.
 
+### `api`
+
+`string`
+
+API is what the provider speaks: OpenAI's, unless this says comfyui —
+a ComfyUI server, asked for pictures at /v1/images/generations and
+sent the workflow below with the request's prompt in it. Model is then
+the checkpoint file the workflow loads, as ComfyUI lists it.
+
+### `workflow`
+
+`string`
+
+Workflow is the ComfyUI workflow, in its API format: a built-in's name
+(flux-schnell, the default, or flux-dev) or a JSON file on the control
+plane.
+
+### `output`
+
+`string`
+
+Output is what it makes: pictures, or meshes (see ComfyUI.Output).
+
 ## Facility
 
 ### `budgets`
@@ -1019,6 +1235,21 @@ site whose own firewall does that job; the rules are kept, and true
 puts them back. Changed in the cluster's settings, it is in force on
 every node and control plane within seconds.
 
+## GPUNeed
+
+### `min_compute_capability`
+
+`float64`
+
+MinComputeCapability is the oldest architecture that runs it: 7.5 is
+Turing, 8.0 Ampere (bf16, flash-attention 2), 8.9 Ada (fp8), 9.0 Hopper.
+
+### `min_memory_gb`
+
+`int`
+
+MinMemoryGB is the card's own memory it needs.
+
 ## GuardModel
 
 ### `format`
@@ -1038,6 +1269,62 @@ ShieldGemma: Yes or No), or json ({"safe": false, "categories":
 Categories the model is asked about, for shieldgemma — each a policy
 sentence — and the names reported for llamaguard3's S1, S2, ….
 
+## Input
+
+### `name`
+
+`string`
+
+Name is the placeholder's, and the request's key.
+
+### `type`
+
+`string`
+
+Type is one of text, int, float, bool, choice, image, mask, audio,
+video, file. The last five are files, sent as base64, a data URL, or
+the id of a file uploaded to /v1/files, and put in ComfyUI's input
+directory; the placeholder gets the name they were given there.
+
+### `required`
+
+`bool`
+
+Required inputs must be in every request; the others take Default,
+or the workflow's own {{name|default}}.
+
+### `default`
+
+`any`
+
+### `min`
+
+`*float64`
+
+Min and Max bound a number; for text, Max bounds its length.
+
+### `max`
+
+`*float64`
+
+### `choices`
+
+`[]string`
+
+Choices are what a choice may be.
+
+### `max_mb`
+
+`int`
+
+MaxMB bounds a file input; zero is the type's own bound.
+
+### `doc`
+
+`string`
+
+Doc says what the input is for, to whoever fills it in.
+
 ## JudgePolicy
 
 ### `model`
@@ -1149,6 +1436,63 @@ llmgw in general — no address, model or key of this installation —
 which the project's repository publishes anyway. On, a visitor is sent
 to sign in, and without accounts the portal needs an API key.
 
+## License
+
+### `id`
+
+`string`
+
+ID names the licence for a machine: an SPDX identifier where there is
+one (MIT, Apache-2.0, CC-BY-NC-4.0), else a lowercase name of the
+licence's own (stability-community, tencent-hunyuan-community). What a
+person's or a site's choice of licences matches on. Name is for people.
+
+### `name`
+
+`string`
+
+Name is the licence's own: MIT, Apache-2.0.
+
+### `url`
+
+`string`
+
+### `notice`
+
+`string`
+
+Notice is what must accompany what was made: attribution, terms on
+the output, what the weights were trained on.
+
+### `commercial`
+
+`*bool`
+
+Commercial says whether what is made may be used commercially: nil
+is not said, which is not the same as yes.
+
+### `excluded_regions`
+
+`[]string`
+
+ExcludedRegions are where the licence grants nothing: ISO 3166 codes,
+and EU for the union (Hunyuan's: EU, UK, KR).
+
+### `revenue_cap_usd`
+
+`int64`
+
+RevenueCapUSD is the yearly revenue above which the licence asks for
+another agreement (Stability's community licence: 1000000). Zero is
+none.
+
+### `attribution`
+
+`string`
+
+Attribution is what a product using the output must show: "Powered by
+Stability AI".
+
 ## LlamaCppConfig
 
 ### `bin`
@@ -1305,6 +1649,25 @@ allowlist.
 
 Takes a [External](#external) block.
 
+### `comfyui`
+
+`*ComfyUI`
+
+ComfyUI is how a model whose profiles run engine comfyui makes its
+pictures: the workflow, and the file it loads.
+
+Takes a [ComfyUI](#comfyui) block.
+
+### `license`
+
+`*License`
+
+License is the terms of what the model makes, for a model whose
+output somebody ships: shown with every result and written into a
+mesh.
+
+Takes a [License](#license) block.
+
 ### `adapters`
 
 `[]Adapter`
@@ -1389,6 +1752,16 @@ Capabilities is what this model can do beyond plain completion.
 
 Takes a [Capabilities](#capabilities) block.
 
+### `query_prefix`
+
+`string`
+
+QueryPrefix is put before a question an embedding model embeds for a
+knowledge-base search; documents are embedded without it. Models
+trained with an instruction on the query side want it, Qwen3-Embedding
+"Instruct: Given a web search query, retrieve relevant passages that
+answer the query\nQuery: " for one.
+
 ### `role`
 
 `string`
@@ -1542,6 +1915,25 @@ kept by llmgw bundle import and llmgw bundle trust; every engine file
 a node fetches from the mirror is checked against it. Read again
 whenever it changes. Empty is /etc/llmgw/offline.sha256.
 
+## OnDemandSettings
+
+### `evict_after_idle`
+
+`time.Duration`
+
+EvictAfterIdle is how long an on-demand replica must go unasked-for
+before a model that wants its card may have it. Zero keeps 2m.
+
+### `min_lifetime`
+
+`time.Duration`
+
+MinLifetime is how long a replica that has just come up is safe from
+that, so two models do not take turns paying for loads. Zero keeps
+5m. On one card shared by a picture model and a 3D model, 1m each
+brings the wait between a picture and its mesh to about a minute.
+Both are in force on the leader within seconds.
+
 ## Options
 
 ### `nvidia_smi`
@@ -1790,6 +2182,20 @@ before affinity is abandoned.
 
 `float64`
 
+## PresetSettings
+
+### `auto`
+
+`bool`
+
+Auto has the leading control plane add a picture model (flux-schnell)
+and a 3D model (triposr) by itself, on demand, once a node has a card
+that fits one and the catalog has no model that makes the same kind of
+thing — so a new cluster's portal has its pictures and 3D pages
+without anybody writing a definition. Only where the cluster already
+installs ComfyUI (engines.comfyui). A preset somebody removed is not
+added again by itself. In force on the leader within a minute.
+
 ## PreviousOrigin
 
 ### `source`
@@ -1826,6 +2232,16 @@ version starts with it: "0.11" takes vLLM 0.11.0 and 0.11.1, not
 
 `string`
 
+### `source`
+
+`string`
+
+Source is the weights this profile loads, when not the model's: an
+embedding model served by vLLM from its repository on a card and by
+llama.cpp from a GGUF on CPUs is one model with two sources. Empty
+loads the model's. Updates and canaries move the model's source; a
+profile with its own keeps it.
+
 ### `tp`
 
 `int`
@@ -1973,6 +2389,39 @@ is started with sha256_cbor block hashing and a fixed PYTHONHASHSEED,
 which the router's hashing assumes; arguments overriding either leave
 the index empty, and the agent says so in its log.
 
+### `gpu`
+
+`*GPUNeed`
+
+GPU says what card the profile needs, in place of naming its class:
+it stands for every class in the cluster that meets it. A catalog
+entry written once then places sensibly on any site's cards.
+
+Takes a [GPUNeed](#gpuneed) block.
+
+### `comfyui`
+
+`*ProfileComfyUI`
+
+ComfyUI is this profile's own workflow, checkpoint and nodes, over the
+model's: an fp8 workflow where the card has fp8, fp16 where it has not.
+
+Takes a [ProfileComfyUI](#profilecomfyui) block.
+
+## ProfileComfyUI
+
+### `workflow`
+
+`string`
+
+### `checkpoint`
+
+`string`
+
+### `nodes`
+
+`[]CustomNode`
+
 ## Router
 
 ### `activation_wait`
@@ -2549,6 +2998,23 @@ Firewall turns llmgw's firewall on every machine on or off.
 
 Takes a [FirewallSettings](#firewallsettings) block.
 
+### `presets`
+
+`PresetSettings`
+
+Presets is how the models that come with llmgw reach the catalog.
+
+Takes a [PresetSettings](#presetsettings) block.
+
+### `on_demand`
+
+`OnDemandSettings`
+
+OnDemand is how models that load when asked for take turns on the
+cards.
+
+Takes a [OnDemandSettings](#ondemandsettings) block.
+
 ### `agents`
 
 `AgentSettings`
@@ -2889,6 +3355,21 @@ is sha256=<hex HMAC of the body>.
 
 `int64`
 
+### `per_image`
+
+`int64`
+
+PerImage is what one picture costs, for a model that makes them: a
+picture's cost is the card's time, which its prompt's few tokens do
+not measure.
+
+### `per_mesh`
+
+`int64`
+
+PerMesh is what one 3D model costs: minutes of a card, which no
+token count measures.
+
 ## admission.Band
 
 ### `name`
@@ -2908,6 +3389,15 @@ Priority orders bands; higher is served first.
 SaturationCeiling is the pool saturation above which this band waits.
 1.0 means "never hold this band back".
 
+### `queue_ttl`
+
+`time.Duration`
+
+QueueTTL, set, is how long this band's requests may wait instead of
+the controller's: a band for bulk work — a knowledge-base import, a
+backfill — whose requests had rather wait ten minutes behind people
+than be turned away after thirty seconds.
+
 ## admission.Config
 
 ### `bands`
@@ -3121,6 +3611,14 @@ Takes a [Tracing](#tracing) block.
 
 `float64`
 
+### `queue_ttl`
+
+`time.Duration`
+
+QueueTTL is how long this band's requests may wait for room; the
+admission's queue_ttl unless set. Long for a band of bulk work, which
+had rather wait behind people than be turned away.
+
 ## config.Price
 
 ### `prompt_per_1k`
@@ -3131,6 +3629,19 @@ Takes a [Tracing](#tracing) block.
 
 `int64`
 
+### `per_image`
+
+`int64`
+
+PerImage is the cost of one picture, for a model that makes them
+(/v1/images/generations), on top of its prompt's tokens.
+
+### `per_mesh`
+
+`int64`
+
+PerMesh is the cost of one 3D model (/v1/3d/generations).
+
 ## engines.Config
 
 ### `disabled`
@@ -3174,6 +3685,14 @@ Takes a [TRTLLMConfig](#trtllmconfig) block.
 
 Takes a [SimConfig](#simconfig) block.
 
+### `comfyui`
+
+`ComfyUIConfig`
+
+ComfyUI makes pictures; offered by a node whose ComfyUI is named here.
+
+Takes a [ComfyUIConfig](#comfyuiconfig) block.
+
 ## guard.Config
 
 ### `enabled`

internal/accounting/accounting.go

@@ -323,7 +323,7 @@ func (a *Accountant) Record(res Reservation, u store.Usage) {
 	if u.ServedModel != "" && u.ServedModel != u.Model && a.pricing != nil {
 		price = a.pricing.For(u.ServedModel)
 	}
-	u.CostMicros = price.Cost(u.PromptTokens, u.CompletionTokens)
+	u.CostMicros = price.Cost(u.PromptTokens, u.CompletionTokens, u.Images, u.Meshes)
 	for _, b := range res.Budgets {
 		a.budgets.Add(b.Counter, b.Period, u.CostMicros)
 	}

internal/accounting/accounting_test.go

@@ -39,17 +39,27 @@ func TestCostRoundsUpSoSmallRequestsAreNotFree(t *testing.T) {
 	// Rounding down would make a stream of tiny requests cost nothing, which is
 	// exactly the traffic shape a quota exists to bound.
 	p := Price{PromptPer1k: 1000, CompletionPer1k: 3000}
-	if got := p.Cost(1, 0); got != 1 {
+	if got := p.Cost(1, 0, 0, 0); got != 1 {
 		t.Errorf("one prompt token cost %d", got)
 	}
-	if got := p.Cost(1000, 1000); got != 4000 {
+	if got := p.Cost(1000, 1000, 0, 0); got != 4000 {
 		t.Errorf("a thousand of each cost %d, want 4000", got)
 	}
-	if got := p.Cost(0, 0); got != 0 {
+	if got := p.Cost(0, 0, 0, 0); got != 0 {
 		t.Errorf("an empty request cost %d", got)
 	}
 }
 
+func TestAPictureCostsItsPriceOnTopOfItsPrompt(t *testing.T) {
+	p := Price{PromptPer1k: 1000, PerImage: 50000}
+	if got := p.Cost(20, 0, 3, 0); got != 20+150000 {
+		t.Errorf("three pictures from a 20-token prompt cost %d", got)
+	}
+	if (Price{PerImage: 1}).Zero() {
+		t.Error("a model priced per picture reads as free, and would pass a spent budget")
+	}
+}
+
 func TestZeroPricedModelsStayAvailableWhenTheBudgetIsSpent(t *testing.T) {
 	// This is what makes budget fallback work: a key with nothing left can
 	// still be served something that costs nothing.

internal/accounting/cost.go

@@ -18,6 +18,13 @@ import (
 type Price struct {
 	PromptPer1k     int64 `koanf:"prompt_per_1k"`
 	CompletionPer1k int64 `koanf:"completion_per_1k"`
+	// PerImage is what one picture costs, for a model that makes them: a
+	// picture's cost is the card's time, which its prompt's few tokens do
+	// not measure.
+	PerImage int64 `koanf:"per_image"`
+	// PerMesh is what one 3D model costs: minutes of a card, which no
+	// token count measures.
+	PerMesh int64 `koanf:"per_mesh"`
 }
 
 // Zero reports whether this model spends nothing.
@@ -25,14 +32,17 @@ type Price struct {
 // It matters beyond arithmetic: a zero-cost model stays available to a key
 // whose budget is spent, which is what makes the plan's budget fallback work
 // (§7.7).
-func (p Price) Zero() bool { return p.PromptPer1k == 0 && p.CompletionPer1k == 0 }
+func (p Price) Zero() bool {
+	return p.PromptPer1k == 0 && p.CompletionPer1k == 0 && p.PerImage == 0 && p.PerMesh == 0
+}
 
 // Cost computes what a request spent, rounding up.
 //
 // Up rather than to nearest: rounding down would make a stream of tiny requests
 // free, which is exactly the shape of traffic a quota exists to bound.
-func (p Price) Cost(promptTokens, completionTokens int64) int64 {
-	return divUp(promptTokens*p.PromptPer1k, 1000) + divUp(completionTokens*p.CompletionPer1k, 1000)
+func (p Price) Cost(promptTokens, completionTokens, images, meshes int64) int64 {
+	return divUp(promptTokens*p.PromptPer1k, 1000) + divUp(completionTokens*p.CompletionPer1k, 1000) +
+		max(images, 0)*p.PerImage + max(meshes, 0)*p.PerMesh
 }
 
 func divUp(n, d int64) int64 {

internal/agent/agent.go

@@ -6,6 +6,7 @@ import (
 	"crypto/sha256"
 	"crypto/tls"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -1131,6 +1132,31 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 		stop()
 		spec.Profile.ModelPath = path
 	}
+	// A shared ComfyUI replica's members' weights, each fetched like the
+	// model's, and handed to the gate where they landed.
+	if raw := spec.Profile.Env[engines.SharedModelsEnv]; raw != "" {
+		var ms []map[string]string
+		if err := json.Unmarshal([]byte(raw), &ms); err != nil {
+			report(supervisor.Failed, "the shared replica's models are not readable: "+err.Error(), nil)
+			return
+		}
+		for i, m := range ms {
+			stop := a.watchFetch(m["source"], func(p weights.Progress) {
+				send(&llmgwv1.ShardStatus{State: agentsvc.StateToWire(supervisor.Starting),
+					Fetch: &llmgwv1.FetchProgress{Source: p.Source, BytesDone: p.BytesDone, BytesTotal: p.BytesTotal}})
+			})
+			path, err := a.weights().Ensure(ctx, m["source"])
+			stop()
+			if err != nil {
+				report(supervisor.Failed, fmt.Sprintf("model %s: %v", m["name"], err), nil)
+				return
+			}
+			ms[i]["path"] = path
+		}
+		b, _ := json.Marshal(ms)
+		spec.Profile.Env = maps.Clone(spec.Profile.Env)
+		spec.Profile.Env[engines.SharedModelsEnv] = string(b)
+	}
 	// Adapters are fetched like the model, and before the engine starts: it
 	// loads them at start, and one missing is a replica that answers for the
 	// base model under the adapter's name.

internal/agent/discovery/host.go

@@ -3,6 +3,7 @@ package discovery
 import (
 	"bufio"
 	"os"
+	"regexp"
 	"runtime"
 	"strconv"
 	"strings"
@@ -142,17 +143,29 @@ func cpuFlagsFrom(path string) []string {
 // nvidiaDriverFrom reads the loaded kernel module's version, which exists
 // exactly when a driver is loaded — unlike nvidia-smi, which can be installed
 // on a machine whose module failed to load.
+var driverVersion = regexp.MustCompile(`^[0-9]+\.[0-9]+(\.[0-9]+)?$`)
+
 func nvidiaDriverFrom(path string) string {
 	b, err := os.ReadFile(path) //nolint:gosec // a fixed system path
 	if err != nil {
 		return ""
 	}
-	// "NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.15  Thu ..."
+	// "NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.15  Thu ...", or
+	// for the open module, the default since 560, "NVIDIA UNIX Open Kernel
+	// Module for x86_64  580.82.07  Release Build ...": the first version
+	// after "Module", not the word after it. Read as "for", the driver was
+	// unknown, and every build was tried whatever driver it needs.
 	fields := strings.Fields(string(b))
 	for i, f := range fields {
-		if f == "Module" && i+1 < len(fields) {
-			return fields[i+1]
+		if f != "Module" {
+			continue
 		}
+		for _, v := range fields[i+1:] {
+			if driverVersion.MatchString(v) {
+				return v
+			}
+		}
+		return ""
 	}
 	return ""
 }

internal/agent/discovery/host_driver_test.go

@@ -0,0 +1,25 @@
+package discovery
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestNVIDIADriverFrom(t *testing.T) {
+	for _, tc := range []struct{ text, want string }{
+		{"NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.15  Thu Jan 23 21:30:38 UTC 2025\nGCC version:  gcc version 12.2.0\n", "570.86.15"},
+		{"NVRM version: NVIDIA UNIX Open Kernel Module for x86_64  580.82.07  Release Build  (dvs-builder@U16-I3-B03-4-3)  Wed Aug 27 00:51:12 UTC 2025\n", "580.82.07"},
+		{"NVRM version: NVIDIA UNIX Open Kernel Module for aarch64  580.95.05  Release Build\n", "580.95.05"},
+		{"NVRM version: NVIDIA UNIX x86_64 Kernel Module  535.54  Mon\n", "535.54"},
+		{"something else\n", ""},
+	} {
+		p := filepath.Join(t.TempDir(), "version")
+		if err := os.WriteFile(p, []byte(tc.text), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		if got := nvidiaDriverFrom(p); got != tc.want {
+			t.Errorf("%q: got %q, want %q", tc.text, got, tc.want)
+		}
+	}
+}

internal/agent/engines/comfyui.go

@@ -0,0 +1,151 @@
+package engines
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"sync/atomic"
+)
+
+// ComfyUIConfig locates a ComfyUI installation.
+type ComfyUIConfig struct {
+	// Dir is ComfyUI's directory, where main.py is. Readable by the user
+	// engines run as.
+	Dir string `koanf:"dir"`
+	// Python is the interpreter of its environment; Dir's .venv when unset.
+	Python string `koanf:"python"`
+}
+
+// ComfyUI runs ComfyUI as an engine, behind llmgw's gate (llmgw
+// comfyui-gate): ComfyUI asks for no key, so it listens on the loopback and
+// the gate, which does, on the replica's port. Its replicas make pictures
+// for /v1/images/generations.
+type ComfyUI struct {
+	cfg       ComfyUIConfig
+	installed atomic.Pointer[string]
+}
+
+// Name identifies the engine in the catalog.
+func (*ComfyUI) Name() string { return "comfyui" }
+
+// HealthPath is the gate's, which answers once ComfyUI does.
+func (*ComfyUI) HealthPath() string { return "/health" }
+
+// MetricsPath is empty: ComfyUI publishes no metrics, and the router reads
+// none from it.
+func (*ComfyUI) MetricsPath() string { return "" }
+
+// ServesHTTP is true: a ComfyUI replica is one process on one node.
+func (*ComfyUI) ServesHTTP(ShardSpec) bool { return true }
+
+// UseInstalled points the engine at the environment the agent installed:
+// its interpreter, with ComfyUI's code beside its bin, in comfyui/.
+func (c *ComfyUI) UseInstalled(python string) { c.installed.Store(&python) }
+
+// Configured reports whether the configuration names a ComfyUI.
+func (c *ComfyUI) Configured() bool { return c.cfg.Dir != "" }
+
+func (c *ComfyUI) dir() string {
+	if p := c.installed.Load(); p != nil {
+		return filepath.Join(filepath.Dir(filepath.Dir(*p)), "comfyui")
+	}
+	return c.cfg.Dir
+}
+
+func (c *ComfyUI) python() string {
+	if p := c.installed.Load(); p != nil {
+		return *p
+	}
+	if c.cfg.Python != "" {
+		return c.cfg.Python
+	}
+	return filepath.Join(c.cfg.Dir, ".venv", "bin", "python")
+}
+
+var comfyVersion = regexp.MustCompile(`__version__\s*=\s*"([^"]+)"`)
+
+// Probe reports ComfyUI's version, from the file its build writes it to:
+// importing ComfyUI to ask would load torch and look for cards.
+func (c *ComfyUI) Probe(context.Context) (string, error) {
+	dir := c.dir()
+	if dir == "" {
+		return "", fmt.Errorf("no ComfyUI directory is configured")
+	}
+	if _, err := os.Stat(filepath.Join(dir, "main.py")); err != nil {
+		return "", fmt.Errorf("%s is not ComfyUI: %w", dir, err)
+	}
+	b, err := os.ReadFile(filepath.Join(dir, "comfyui_version.py"))
+	if err != nil {
+		return Unknown, nil //nolint:nilerr // installed, of a version it does not say
+	}
+	if m := comfyVersion.FindSubmatch(b); m != nil {
+		return string(m[1]), nil
+	}
+	return Unknown, nil
+}
+
+// Validate checks the profile: one card, on one node. ComfyUI runs a
+// workflow on one device and has no tensor parallelism to spread it by.
+func (*ComfyUI) Validate(p Profile, gpus []GPUInfo) error {
+	if p.Nodes > 1 || p.TP > 1 || p.PP > 1 || p.GPUsPerNode > 1 {
+		return fmt.Errorf("profile %q: ComfyUI runs on one GPU of one node", p.Name)
+	}
+	return validateCommon(p, gpus)
+}
+
+// Commands is the gate, which starts ComfyUI itself.
+func (c *ComfyUI) Commands(s ShardSpec) ([]Command, error) {
+	dir := c.dir()
+	if dir == "" {
+		return nil, fmt.Errorf("comfyui: no ComfyUI directory is configured (engines.comfyui.dir)")
+	}
+	bin, err := os.Executable()
+	if err != nil {
+		return nil, err
+	}
+	p := s.Profile
+	args := []string{"comfyui-gate",
+		"--listen", net.JoinHostPort(s.Host(), strconv.Itoa(s.HTTPPort)),
+		"--model", p.ServedModelName,
+		"--weights", p.ModelPath,
+		// Relative to where engines run — their user's home — so it is
+		// theirs to write.
+		"--state", filepath.Join("comfyui", s.ReplicaID),
+		"--python", c.python(),
+		"--comfyui", dir,
+		"--",
+	}
+	args = append(args, p.Args...)
+	env := baseEnv(s)
+	if s.APIKey != "" {
+		env["LLMGW_ENGINE_KEY"] = s.APIKey
+	}
+	// A model's custom nodes and the repository a node loads its weights by,
+	// which only the catalog sets — a profile's env may not name them — and
+	// so taken before baseEnv drops them. Without the repository the gate
+	// links no Hugging Face cache, and sf3d's node went to the network for
+	// its gated repository and was refused with a 401.
+	for _, k := range []string{comfyNodesEnv, comfyHFRepoEnv, SharedModelsEnv} {
+		if v := p.Env[k]; v != "" {
+			env[k] = v
+		}
+	}
+	return []Command{{Name: "comfyui", Path: bin, Args: args, Env: materializeEnv(env)}}, nil
+}
+
+// comfyNodesEnv is the custom nodes the catalog gives a ComfyUI model, as
+// JSON; catalog.NodesEnv and comfy.NodesEnv by the same name.
+const comfyNodesEnv = "LLMGW_COMFYUI_NODES"
+
+// comfyHFRepoEnv is the repository a custom node loads the weights by name
+// from; catalog.HFRepoEnv and comfy.HFRepoEnv by the same name.
+const comfyHFRepoEnv = "LLMGW_COMFYUI_HF_REPO"
+
+// SharedModelsEnv is a shared replica's members — name, source, and the
+// path the agent fetched it to — as JSON; catalog.SharedModelsEnv and
+// comfy.SharedModelsEnv by the same name.
+const SharedModelsEnv = "LLMGW_COMFYUI_MODELS"

internal/agent/engines/comfyui_test.go

@@ -0,0 +1,99 @@
+package engines
+
+import (
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"testing"
+)
+
+func TestComfyUIRunsBehindTheGateWithItsKeyOutOfSight(t *testing.T) {
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: "/opt/comfyui"}}
+	cmds, err := c.Commands(ShardSpec{
+		ReplicaID: "r-flux-1", HTTPPort: 8100, BindAddr: "10.0.0.147", APIKey: "sekret", GPUIndices: []int{0},
+		Profile: Profile{Name: "p", Engine: "comfyui", ModelPath: "/w/flux.safetensors", ServedModelName: "flux",
+			Args: []string{"--disable-smart-memory"}},
+	})
+	if err != nil || len(cmds) != 1 {
+		t.Fatalf("%v %v", cmds, err)
+	}
+	args := strings.Join(cmds[0].Args, " ")
+	for _, want := range []string{"comfyui-gate", "--listen 10.0.0.147:8100", "--model flux", "--weights /w/flux.safetensors",
+		"--state comfyui/r-flux-1", "--python /opt/comfyui/.venv/bin/python", "--comfyui /opt/comfyui", "-- --disable-smart-memory"} {
+		if !strings.Contains(args, want) {
+			t.Errorf("%q not in %q", want, args)
+		}
+	}
+	if strings.Contains(args, "sekret") {
+		t.Error("the key is on the command line, where every user can read it")
+	}
+	if !slices.Contains(cmds[0].Env, "LLMGW_ENGINE_KEY=sekret") || !slices.Contains(cmds[0].Env, "CUDA_VISIBLE_DEVICES=0") {
+		t.Error("the key or the card is not in the environment")
+	}
+}
+
+func TestTheGateIsToldTheNodesAndTheRepositoryTheCatalogGives(t *testing.T) {
+	// The repository was dropped on the way: sf3d's node went to the network
+	// for its gated repository, with no cache linked, and got a 401.
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: "/opt/comfyui"}}
+	cmds, err := c.Commands(ShardSpec{
+		ReplicaID: "r-sf3d-1", HTTPPort: 8100, BindAddr: "10.0.0.147", GPUIndices: []int{0},
+		Profile: Profile{Name: "p", Engine: "comfyui", ModelPath: "/w/sf3d/", ServedModelName: "sf3d",
+			Env: map[string]string{comfyNodesEnv: `[{"repo":"x"}]`, comfyHFRepoEnv: "stabilityai/stable-fast-3d"}},
+	})
+	if err != nil || len(cmds) != 1 {
+		t.Fatalf("%v %v", cmds, err)
+	}
+	for _, want := range []string{comfyNodesEnv + `=[{"repo":"x"}]`, comfyHFRepoEnv + "=stabilityai/stable-fast-3d"} {
+		if !slices.Contains(cmds[0].Env, want) {
+			t.Errorf("%q not in the gate's environment", want)
+		}
+	}
+}
+
+func TestComfyUIRunsOnOneCard(t *testing.T) {
+	c := &ComfyUI{}
+	if err := c.Validate(Profile{Name: "p", ModelPath: "/w", TP: 2}, h100(2)); err == nil {
+		t.Error("a two-card ComfyUI profile was accepted")
+	}
+	if err := c.Validate(Profile{Name: "p", ModelPath: "/w", TP: 1}, h100(1)); err != nil {
+		t.Error(err)
+	}
+	if _, err := c.Commands(ShardSpec{Profile: Profile{ModelPath: "/w"}}); err == nil {
+		t.Error("commands without a ComfyUI directory")
+	}
+}
+
+func TestComfyUIIsOfferedByTheVersionItsBuildWrote(t *testing.T) {
+	dir := t.TempDir()
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: dir}}
+	if _, err := c.Probe(t.Context()); err == nil {
+		t.Error("a directory without main.py passed for ComfyUI")
+	}
+	_ = os.WriteFile(filepath.Join(dir, "main.py"), nil, 0o644)
+	_ = os.WriteFile(filepath.Join(dir, "comfyui_version.py"), []byte("__version__ = \"0.39.2\"\n"), 0o644)
+	if v, err := c.Probe(t.Context()); err != nil || v != "0.39.2" {
+		t.Errorf("%q %v", v, err)
+	}
+	if got := NewRegistry(Config{ComfyUI: ComfyUIConfig{Dir: dir}}).ProbeConfigured(t.Context()); got["comfyui"] != "0.39.2" {
+		t.Errorf("a configured ComfyUI is reported as %v", got)
+	}
+	if err := UnsafeArgs("comfyui", []string{"--enable-manager"}); err == nil {
+		t.Error("a profile may install ComfyUI nodes")
+	}
+}
+
+func TestAnInstalledComfyUIIsFoundBesideItsInterpreter(t *testing.T) {
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: "/opt/by-hand"}}
+	c.UseInstalled("/opt/llmgw/engines/comfyui/0.39.2-cu13/bin/python")
+	cmds, err := c.Commands(ShardSpec{ReplicaID: "r", HTTPPort: 1, Profile: Profile{ModelPath: "/w", ServedModelName: "m"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	args := strings.Join(cmds[0].Args, " ")
+	if !strings.Contains(args, "--python /opt/llmgw/engines/comfyui/0.39.2-cu13/bin/python") ||
+		!strings.Contains(args, "--comfyui /opt/llmgw/engines/comfyui/0.39.2-cu13/comfyui") {
+		t.Errorf("the installed ComfyUI is not what runs: %s", args)
+	}
+}

internal/agent/engines/engine.go

@@ -214,6 +214,7 @@ func NewRegistry(cfg Config) *Registry {
 	r.Add(&LlamaCpp{cfg: cfg.LlamaCpp})
 	r.Add(&TRTLLM{cfg: cfg.TRTLLM})
 	r.Add(&Sim{cfg: cfg.Sim})
+	r.Add(&ComfyUI{cfg: cfg.ComfyUI})
 	return r
 }
 
@@ -262,6 +263,8 @@ type Config struct {
 	// offers it only when its interpreter is named here.
 	TRTLLM TRTLLMConfig `koanf:"trtllm"`
 	Sim    SimConfig    `koanf:"sim"`
+	// ComfyUI makes pictures; offered by a node whose ComfyUI is named here.
+	ComfyUI ComfyUIConfig `koanf:"comfyui"`
 }
 
 // --- shared helpers ---

internal/agent/engines/engines_test.go

@@ -477,7 +477,7 @@ func TestValidateRequiresModelPath(t *testing.T) {
 
 func TestRegistry(t *testing.T) {
 	r := NewRegistry(Config{})
-	if got := r.Names(); !slices.Equal(got, []string{"llamacpp", "sglang", "sim", "trtllm", "vllm"}) {
+	if got := r.Names(); !slices.Equal(got, []string{"comfyui", "llamacpp", "sglang", "sim", "trtllm", "vllm"}) {
 		t.Errorf("registry contents: %v", got)
 	}
 	if _, err := r.Get("vllm"); err != nil {

internal/agent/engines/unsafeenv.go

@@ -119,6 +119,19 @@ var flagsNever = map[string]map[string]string{
 		"--model-path": "is the model's source, set by the agent", "--served-model-name": "is set by the agent",
 		"--lora-paths": "loads files", "--download-dir": "writes files",
 	},
+	// ComfyUI's main.py, behind the gate that sets where it listens and
+	// where its files are.
+	"comfyui": {
+		"--listen": "is set by the agent", "--base-directory": "is set by the agent",
+		"--extra-model-paths-config": "is set by the agent",
+		"--output-directory":         "writes files", "--temp-directory": "writes files",
+		"--input-directory": "reads files", "--user-directory": "writes files",
+		"--database-url": "writes a database elsewhere", "--front-end-root": "serves a directory",
+		"--enable-cors-header": "lets other sites' pages call it",
+		"--enable-manager":     "installs nodes, which run Python",
+		"--tls-keyfile":        "reads a file", "--tls-certfile": "reads a file",
+		"--comfy-api-base": "sends work to another service",
+	},
 	// trtllm-serve spells its flags with underscores, so the shared list's
 	// hyphenated names do not reach them.
 	"trtllm": {

internal/agent/provision/comfyui_test.go

@@ -0,0 +1,177 @@
+package provision
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
+)
+
+// comfyuiSource is a ComfyUI release archive as GitHub makes one, and the
+// recipe pointed at it.
+func comfyuiSource(t *testing.T, in *Installer, rel *release, digest string) {
+	t.Helper()
+	archive := tarGz(t, map[string]string{
+		"ComfyUI-0.39.2/main.py":            "print('comfy')\n",
+		"ComfyUI-0.39.2/comfyui_version.py": "__version__ = \"0.39.2\"\n",
+		"ComfyUI-0.39.2/requirements.txt": "comfyui-frontend-package==1.53.10\ntorch\ntorchvision\n" +
+			"numpy>=1.25.0\n\n#non essential dependencies:\nkornia>=0.7.1\n",
+	}, nil)
+	rel.assets["v0.39.2.tar.gz"] = archive
+	sum := sha256.Sum256(archive)
+	if digest == "" {
+		digest = hex.EncodeToString(sum[:])
+	}
+	old := comfyuiReleases
+	comfyuiReleases = map[string]struct {
+		sha256    string
+		published string
+	}{"0.39.2": {digest, "2026-10-07T21:58:07Z"}}
+	t.Cleanup(func() { comfyuiReleases = old })
+}
+
+var turingNode = discovery.Host{OSID: "ubuntu", OSVersion: "24.04", Arch: "amd64",
+	NVIDIADriver: "580.82.07", MinComputeCapability: 7.5}
+
+func TestComfyUIIsInstalledFromItsSourceCheckedAgainstTheRecipe(t *testing.T) {
+	sys := &fakePython{fakeSystem: fakeSystem{installed: map[string]bool{}}}
+	in, rel := pythonInstaller(t, turingNode, sys)
+	comfyuiSource(t, in, rel, "")
+
+	got := in.Converge(t.Context(), []Want{{Engine: "comfyui", Version: "0.39.2"}})
+	if got[0].State != Ready {
+		t.Fatalf("not ready: %+v", got[0])
+	}
+	dir := filepath.Join(in.Root, "comfyui", "0.39.2-cu13")
+	if got[0].Binary != filepath.Join(dir, "bin", "python") {
+		t.Errorf("binary %s, want the environment's interpreter", got[0].Binary)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "comfyui", "main.py")); err != nil {
+		t.Errorf("ComfyUI's code is not beside the interpreter: %v", err)
+	}
+	all := strings.Join(sys.commands, "\n")
+	for _, want := range []string{
+		// Not PyPI's date, which ComfyUI has none of: the recipe's, a day on.
+		"--exclude-newer 2026-10-08T21:58:07Z",
+		"comfyui-frontend-package==1.53.10", "numpy>=1.25.0", "kornia>=0.7.1", "torch",
+		"--require-hashes",
+	} {
+		if !strings.Contains(all, want) {
+			t.Errorf("no %q in:\n%s", want, all)
+		}
+	}
+	if strings.Contains(all, "/pypi/") {
+		t.Error("PyPI was asked when ComfyUI was published")
+	}
+}
+
+func TestComfyUIOnAnOlderDriverTakesPyTorchsCUDA12Torch(t *testing.T) {
+	sys := &fakePython{fakeSystem: fakeSystem{installed: map[string]bool{}}}
+	host := turingNode
+	host.NVIDIADriver = "550.163.01"
+	in, rel := pythonInstaller(t, host, sys)
+	comfyuiSource(t, in, rel, "")
+	got := in.Converge(t.Context(), []Want{{Engine: "comfyui", Version: "0.39.2"}})
+	if got[0].State != Ready || got[0].Variant != "cu129" {
+		t.Fatalf("got %+v", got[0])
+	}
+	var project string
+	for _, c := range sys.commands {
+		if strings.HasPrefix(c, "pyproject: ") {
+			project = c
+		}
+	}
+	// torch from PyTorch's index alone, named once, as the build names it.
+	if !strings.Contains(project, `torch = { index = "extra" }`) || strings.Count(project, `"torch"`) != 1 {
+		t.Errorf("torch is not from PyTorch's index alone:\n%s", project)
+	}
+}
+
+// A V100 on driver 580: CUDA 13 runs on the driver, but neither its torch
+// nor CUDA 12.9's has kernels for Volta. Tried in turn, each was installed,
+// 10 GB at a time, and failed on the card.
+func TestComfyUIOnAVoltaTakesPyTorchsCUDA126Torch(t *testing.T) {
+	sys := &fakePython{fakeSystem: fakeSystem{installed: map[string]bool{}}}
+	host := turingNode
+	host.MinComputeCapability = 7.0
+	in, rel := pythonInstaller(t, host, sys)
+	comfyuiSource(t, in, rel, "")
+	got := in.Converge(t.Context(), []Want{{Engine: "comfyui", Version: "0.39.2"}})
+	if got[0].State != Ready || got[0].Variant != "cu126" {
+		t.Fatalf("got %+v", got[0])
+	}
+	all := strings.Join(sys.commands, "\n")
+	if !strings.Contains(all, pytorchCU126) || strings.Contains(all, pytorchCU129) {
+		t.Errorf("torch is not CUDA 12.6's:\n%s", all)
+	}
+}
+
+func TestComfyUIWhoseSourceIsNotTheOneTheRecipeNamesIsNotInstalled(t *testing.T) {
+	sys := &fakePython{fakeSystem: fakeSystem{installed: map[string]bool{}}}
+	in, rel := pythonInstaller(t, turingNode, sys)
+	comfyuiSource(t, in, rel, strings.Repeat("ab", 32))
+	got := in.Converge(t.Context(), []Want{{Engine: "comfyui", Version: "0.39.2"}})
+	if got[0].State != Failed || !strings.Contains(got[0].Detail, "does not match") {
+		t.Fatalf("got %s %q", got[0].State, got[0].Detail)
+	}
+	for _, c := range sys.commands {
+		if strings.Contains(c, "pip install") {
+			t.Errorf("installed from a source that did not match: %s", c)
+		}
+	}
+}
+
+func TestComfyUIIsInstalledOnlyWhereItCanRun(t *testing.T) {
+	sys := &fakePython{fakeSystem: fakeSystem{installed: map[string]bool{}}}
+	in, _ := pythonInstaller(t, ubuntu, sys)
+	if got := in.Converge(t.Context(), []Want{{Engine: "comfyui", Version: "0.39.2"}}); got[0].State != Skipped {
+		t.Errorf("a node with no GPU: %+v", got[0])
+	}
+	in, _ = pythonInstaller(t, turingNode, sys)
+	got := in.Converge(t.Context(), []Want{{Engine: "comfyui", Version: "0.1.0"}})
+	if got[0].State != Unsupported || !strings.Contains(got[0].Detail, "knows the source digest of ComfyUI 0.39.2") {
+		t.Errorf("a version without a digest: %s %q", got[0].State, got[0].Detail)
+	}
+}
+
+func TestARequirementsFileIsReadForPackagesAndNothingElse(t *testing.T) {
+	got, err := requirementsIn("torch\ntorchvision>=0.20\nPillow\n# a comment\naiohttp>=3.11 # inline\n", pytorchPackages)
+	if err != nil || strings.Join(got, ",") != "Pillow,aiohttp>=3.11" {
+		t.Errorf("%v %v", got, err)
+	}
+	for _, bad := range []string{"-r other.txt", "--index-url https://evil", "x @ https://evil/x.whl", "-e ."} {
+		if _, err := requirementsIn(bad+"\n", nil); err == nil {
+			t.Errorf("%q was accepted", bad)
+		}
+	}
+}
+
+// A card every build runs on keeps the order it had: a Turing node's
+// installed cu13 is still the first found, and is not installed again
+// because a build for older cards was added after it.
+func TestComfyUIBuildsAreTriedBestFirst(t *testing.T) {
+	variants := func(h discovery.Host) string {
+		builds, err := comfyuiCandidates("0.39.2", "", h)
+		if err != nil {
+			return err.Error()
+		}
+		var v []string
+		for _, b := range builds {
+			v = append(v, b.Variant)
+		}
+		return strings.Join(v, ",")
+	}
+	volta := turingNode
+	volta.MinComputeCapability = 7.0
+	older := turingNode
+	older.NVIDIADriver = "550.163.01"
+	for h, want := range map[*discovery.Host]string{&turingNode: "cu13,cu129,cu126", &volta: "cu126", &older: "cu129,cu126"} {
+		if got := variants(*h); got != want {
+			t.Errorf("cc %.1f driver %s: %s, want %s", h.MinComputeCapability, h.NVIDIADriver, got, want)
+		}
+	}
+}

internal/agent/provision/python.go

@@ -66,12 +66,17 @@ func (in *Installer) installPython(ctx context.Context, r Recipe, w Want, b Buil
 		return fmt.Errorf("installing uv, which installs %s: %s", w.Engine, uv.Detail)
 	}
 
-	in.progress(st, "asking PyPI when %s %s was published", r.PyPI, w.Version)
-	published, err := in.published(ctx, r.PyPI, w.Version)
-	if err != nil {
-		return err
+	var asOf string
+	if !b.AsOf.IsZero() {
+		asOf = b.AsOf.UTC().Format(time.RFC3339)
+	} else {
+		in.progress(st, "asking PyPI when %s %s was published", r.PyPI, w.Version)
+		published, err := in.published(ctx, r.PyPI, w.Version)
+		if err != nil {
+			return err
+		}
+		asOf = published.Add(24 * time.Hour).UTC().Format(time.RFC3339)
 	}
-	asOf := published.Add(24 * time.Hour).UTC().Format(time.RFC3339)
 
 	cache := filepath.Join(in.root(), ".uv-cache")
 	env := []string{
@@ -96,7 +101,14 @@ func (in *Installer) installPython(ctx context.Context, r Recipe, w Want, b Buil
 	}
 	python := filepath.Join(tmp, "bin", "python")
 
-	reqs := b.Requirements
+	reqs := slices.Clone(b.Requirements)
+	if b.Source != nil {
+		more, err := in.unpackSource(ctx, w, b, tmp, st)
+		if err != nil {
+			return err
+		}
+		reqs = append(reqs, more...)
+	}
 	if b.Wheel != nil {
 		// The engine from its GitHub release, pinned to the digest GitHub
 		// publishes for the file: the same trust as an archive, and uv
@@ -320,3 +332,68 @@ func (in *Installer) gpuCheck(ctx context.Context, python string, w Want, b Buil
 	}
 	return nil
 }
+
+// unpackSource fetches an engine's source archive, checks it against the
+// digest the recipe holds, puts its code in the environment, and returns the
+// requirements its requirements file names — less the packages a second
+// index gives, which the build names itself.
+func (in *Installer) unpackSource(ctx context.Context, w Want, b Build, env string, st *Status) ([]string, error) {
+	src := b.Source
+	url := src.URL
+	if strings.HasPrefix(url, "/") {
+		url = strings.TrimSuffix(in.downloadBase(), "/") + url
+	}
+	scratch := env + ".source"
+	_ = os.RemoveAll(scratch)
+	if err := os.MkdirAll(scratch, 0o755); err != nil {
+		return nil, err
+	}
+	defer os.RemoveAll(scratch) //nolint:errcheck // scratch
+	archive := filepath.Join(scratch, "source.tar.gz")
+	name := w.Engine + " " + w.Version + "'s source"
+	if err := in.download(ctx, url, name, archive, src.SHA256, st); err != nil {
+		return nil, err
+	}
+	in.progress(st, "unpacking %s", name)
+	if err := untarGz(archive, scratch); err != nil {
+		return nil, fmt.Errorf("unpacking %s: %w", name, err)
+	}
+	dst := filepath.Join(env, src.Dir)
+	if err := os.Rename(filepath.Join(scratch, src.Top), dst); err != nil {
+		return nil, fmt.Errorf("%s has no %s at its top: %w", name, src.Top, err)
+	}
+	if src.Requirements == "" {
+		return nil, nil
+	}
+	f, err := os.ReadFile(filepath.Join(dst, src.Requirements))
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", name, err)
+	}
+	return requirementsIn(string(f), b.IndexPackages)
+}
+
+// requirementsIn reads a requirements file's lines. Options (-r, -e, --index-url
+// and the like) are refused: they would fetch from somewhere other than PyPI,
+// or install what the lock never saw.
+func requirementsIn(text string, skip []string) ([]string, error) {
+	var out []string
+	for _, line := range strings.Split(text, "\n") {
+		line, _, _ = strings.Cut(line, "#")
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		if strings.HasPrefix(line, "-") || strings.Contains(line, "://") || strings.Contains(line, " @ ") {
+			return nil, fmt.Errorf("the requirements name %q, which is not a package from PyPI", line)
+		}
+		name := strings.ToLower(line)
+		if i := strings.IndexAny(name, "<>=!~;[ "); i >= 0 {
+			name = name[:i]
+		}
+		if slices.Contains(skip, name) {
+			continue
+		}
+		out = append(out, line)
+	}
+	return out, nil
+}

internal/agent/provision/python_test.go

@@ -53,6 +53,7 @@ func (f *fakePython) run(ctx context.Context, env []string, name string, args ..
 			return []byte("error: Hash mismatch for torch\n"), errExit
 		}
 		venv := filepath.Dir(filepath.Dir(args[slices.Index(args, "--python")+1]))
+		_ = os.WriteFile(filepath.Join(venv, "bin", "python"), []byte("#!/bin/sh\n"), 0o755)
 		return nil, os.WriteFile(filepath.Join(venv, "bin", "vllm"), []byte("#!/bin/sh\n"), 0o755)
 	case strings.HasSuffix(name, "/bin/vllm") && args[0] == "--version":
 		return []byte("0.30.0\n"), nil

internal/agent/provision/recipe.go

@@ -13,6 +13,7 @@ import (
 	"fmt"
 	"slices"
 	"strings"
+	"time"
 
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
 )
@@ -68,12 +69,31 @@ type Build struct {
 	// Note says why this build, when it is not the plain one: shown beside
 	// it wherever the installation is.
 	Note string
+	// Source, for a Python engine that is not on PyPI, is its own code: an
+	// archive pinned by its digest, unpacked into the environment, whose
+	// requirements file is installed with Requirements. AsOf is then the
+	// date its dependencies are resolved as of — the day after its version
+	// was published, which PyPI cannot be asked for.
+	Source *Source
+	AsOf   time.Time
 	// FreeGB is the disk space the installation needs before it starts: a
 	// Python engine is several gigabytes, and one that fills the disk halfway
 	// leaves the node worse off than one that never began.
 	FreeGB int
 }
 
+// Source is an engine's code as an archive.
+type Source struct {
+	// URL is fetched as is; SHA256 is what it must hash to, written into
+	// the recipe because a project's source archives come with no published
+	// digest of their own.
+	URL, SHA256 string
+	// Top is the archive's one top directory, put in the environment as Dir.
+	Top, Dir string
+	// Requirements is the requirements file, in Dir.
+	Requirements string
+}
+
 // Wheel is a package published as a GitHub release asset: the asset whose
 // name starts with Prefix and ends with Suffix.
 type Wheel struct {
@@ -104,6 +124,7 @@ var Recipes = map[string]Recipe{
 	"llamacpp": {Repo: "ggml-org/llama.cpp", Candidates: llamaCppCandidates},
 	"vllm":     {PyPI: "vllm", Candidates: vllmCandidates},
 	"sglang":   {PyPI: "sglang", Candidates: sglangCandidates},
+	"comfyui":  {Candidates: comfyuiCandidates},
 	"uv":       {Repo: "astral-sh/uv", Candidates: uvCandidates},
 }
 
@@ -556,3 +577,98 @@ func orUnknown(s string) string {
 	}
 	return s
 }
+
+// --- ComfyUI ---
+
+// comfyuiReleases are the ComfyUI versions this agent installs: each source
+// archive's digest, taken when it was added here and confirmed from a second
+// machine, and when the version was published. GitHub publishes no digest
+// for a tag's archive, so a version not listed is refused rather than
+// installed unchecked.
+var comfyuiReleases = map[string]struct {
+	sha256    string
+	published string
+}{
+	"0.39.2": {"1d655e22cf546700fc1d6d2536e27701695c5832a51f63bb16c41866ac09be0b", "2026-10-07T21:58:07Z"},
+}
+
+// ComfyUIVersion is the newest ComfyUI this agent installs: what a cluster
+// is set to when a model first needs it.
+func ComfyUIVersion() string {
+	newest := ""
+	for v := range comfyuiReleases {
+		if newest == "" || versionBefore(newest, v) {
+			newest = v
+		}
+	}
+	return newest
+}
+
+// ComfyUIRepo is where ComfyUI's source is published.
+const ComfyUIRepo = "Comfy-Org/ComfyUI"
+
+// comfyuiDir is where ComfyUI's code is put in its environment: main.py is
+// <environment>/comfyui/main.py, beside bin/python.
+const comfyuiDir = "comfyui"
+
+// pytorchCU126 is PyTorch's CUDA 12.6 build: the last that carries kernels
+// for Volta and Pascal. From torch 2.8 its CUDA 12.8 and 12.9 builds start
+// at Turing (7.5), as CUDA 13 does, so a V100 has no torch but this one.
+const pytorchCU126 = "https://download.pytorch.org/whl/cu126"
+
+// comfyuiCandidates are the ComfyUI builds for a machine: its source, in a
+// Python environment with the torch for the node's driver and cards —
+// PyPI's, built for CUDA 13; PyTorch's CUDA 12.9 build for a driver CUDA 13
+// does not run on; and its CUDA 12.6 build for cards older than Turing.
+func comfyuiCandidates(version, variant string, h discovery.Host) ([]Build, error) {
+	if _, err := gpuArch("ComfyUI", h); err != nil {
+		return nil, err
+	}
+	rel, ok := comfyuiReleases[version]
+	if !ok {
+		known := make([]string, 0, len(comfyuiReleases))
+		for v := range comfyuiReleases {
+			known = append(known, v)
+		}
+		slices.Sort(known)
+		return nil, fmt.Errorf("this agent knows the source digest of ComfyUI %s, not of %s; "+
+			"install that one by hand and name it in agent.yaml (engines.comfyui.dir)",
+			strings.Join(known, ", "), version)
+	}
+	published, err := time.Parse(time.RFC3339, rel.published)
+	if err != nil {
+		return nil, err
+	}
+	build := func(variant string) Build {
+		return Build{
+			Variant: variant,
+			Python:  pythonForEngines,
+			Source: &Source{
+				URL:    "/" + ComfyUIRepo + "/archive/refs/tags/v" + version + ".tar.gz",
+				SHA256: rel.sha256, Top: "ComfyUI-" + version, Dir: comfyuiDir,
+				Requirements: "requirements.txt",
+			},
+			AsOf: published.Add(24 * time.Hour),
+			// ComfyUI is started as a script, so what the agent is given is
+			// the environment's interpreter; the proof is importing what it
+			// imports first, from where its code is.
+			Binary: "python",
+			VersionArgs: []string{"-c", `import os, sys, torch, aiohttp, safetensors
+d = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(sys.executable))), "` + comfyuiDir + `")
+assert os.path.isfile(os.path.join(d, "main.py")), d + " has no main.py"
+print("comfyui version", "` + version + `", "on torch", torch.__version__)`},
+			Packages: compilerPackages,
+			FreeGB:   15,
+			GPUCheck: true,
+		}
+	}
+	cu129 := build("cu129")
+	cu129.ExtraIndex, cu129.IndexPackages = pytorchCU129, pytorchPackages
+	cu126 := build("cu126")
+	cu126.ExtraIndex, cu126.IndexPackages = pytorchCU126, pytorchPackages
+	return pick("ComfyUI "+version, variant, []candidate{
+		{build("cu13"), gpuNeeds{minDriverForCUDA13, 7.5}, "ComfyUI " + version + " on CUDA 13's torch"},
+		{cu129, gpuNeeds{minDriverForCUDA12, 7.5}, "ComfyUI " + version + " on CUDA 12.9's torch"},
+		{cu126, gpuNeeds{minDriverForCUDA12, 5.0}, "ComfyUI " + version + " on CUDA 12.6's torch"},
+	}, h)
+}

internal/agent/supervisor/outputfile.go

@@ -0,0 +1,139 @@
+package supervisor
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+// An engine's output goes to a file of its own, not to a pipe of the
+// agent's. A pipe has one reader, and that reader is the agent that
+// started the engine: when that agent restarts, the engine it left running
+// — and adopts a moment later — writes to a pipe nobody reads, and its next
+// write past the pipe's buffer fails with EPIPE. A Python engine's progress
+// bar then raises, and takes the request it was reporting on with it. A
+// file has no reader to lose: the engine appends to it, every agent reads
+// it, and the output from before a restart is there for the one after.
+
+// maxOutputBytes bounds one process's file: past it the file is emptied and
+// the process goes on appending to it. A progress bar rewriting itself for
+// an hour would otherwise fill the disk.
+const maxOutputBytes = 64 << 20
+
+// outputPath is where a shard's process writes.
+func (s *Supervisor) outputPath(shardID, name string) string {
+	if name != "" {
+		return filepath.Join(s.cfg.WorkDir, "shard-"+shardID+"."+name+".log")
+	}
+	return filepath.Join(s.cfg.WorkDir, "shard-"+shardID+".log")
+}
+
+// openOutput is the file a process is started with: new, for a process
+// that is new.
+func (s *Supervisor) openOutput(shardID, name string) (*os.File, error) {
+	return os.OpenFile(s.outputPath(shardID, name), os.O_CREATE|os.O_WRONLY|os.O_APPEND|os.O_TRUNC, 0o600) //nolint:gosec // the agent's own directory
+}
+
+// follow reads a process's file into the shard's log as it is written,
+// until the shard's output is stopped and the file has been read to its
+// end. A file an earlier agent began is read from the start, so the output
+// from before a restart is in the log too.
+func (s *Supervisor) follow(sh *Shard, path, name string) {
+	defer sh.outDone.Done()
+	f, err := os.Open(path) //nolint:gosec // the agent's own directory
+	if err != nil {
+		sh.logs.add("[" + name + "] output unavailable: " + err.Error())
+		return
+	}
+	defer f.Close()
+	var offset int64
+	var rest []byte
+	buf := make([]byte, 64<<10)
+	read := func() {
+		for {
+			st, err := f.Stat()
+			if err != nil {
+				return
+			}
+			if st.Size() < offset {
+				// Emptied, by this agent or another: begin again.
+				offset, rest = 0, nil
+			}
+			if st.Size() > maxOutputBytes {
+				_ = os.Truncate(path, 0)
+				offset, rest = 0, nil
+				continue
+			}
+			n, err := f.ReadAt(buf, offset)
+			if n > 0 {
+				offset += int64(n)
+				rest = append(rest, buf[:n]...)
+				for {
+					i := bytes.IndexByte(rest, '\n')
+					if i < 0 {
+						break
+					}
+					s.addLine(sh, name, rest[:i])
+					rest = rest[i+1:]
+				}
+				// A progress bar is a line rewritten with \r and never ended:
+				// its latest state is what is wanted, not a line a megabyte
+				// long. Kept, as llama.cpp and tqdm write them.
+				if len(rest) > 1<<20 {
+					s.addLine(sh, name, rest)
+					rest = nil
+				}
+			}
+			if err != nil || n == 0 {
+				return
+			}
+		}
+	}
+	t := time.NewTicker(200 * time.Millisecond)
+	defer t.Stop()
+	for {
+		select {
+		case <-sh.outStop:
+			read()
+			if len(rest) > 0 {
+				s.addLine(sh, name, rest)
+			}
+			return
+		case <-t.C:
+			read()
+		}
+	}
+}
+
+func (s *Supervisor) addLine(sh *Shard, name string, b []byte) {
+	// The last state of a line rewritten with \r, as a terminal would show.
+	if i := bytes.LastIndexByte(b, '\r'); i >= 0 {
+		b = b[i+1:]
+	}
+	line := string(b)
+	if name != "" {
+		// Prefixed so the two processes of a Ray shard stay distinguishable
+		// in a single log tail.
+		line = "[" + name + "] " + line
+	}
+	sh.logs.add(line)
+	s.log.Debug("engine", "shard", sh.ID, "line", line)
+}
+
+// removeOutput drops a shard's files once nothing writes to them.
+func (s *Supervisor) removeOutput(shardID string) {
+	matches, _ := filepath.Glob(filepath.Join(s.cfg.WorkDir, "shard-"+shardID+".*log"))
+	for _, m := range matches {
+		_ = os.Remove(m)
+	}
+	_ = os.Remove(s.outputPath(shardID, ""))
+}
+
+// stopOutput has every follower read what is left and stop. Called once
+// the process has ended, before the shard is done, so what it wrote last
+// is in the log by the time anyone reads the log for why it ended.
+func (s *Supervisor) stopOutput(sh *Shard) {
+	sh.outOnce.Do(func() { close(sh.outStop) })
+	sh.outDone.Wait()
+}

internal/agent/supervisor/supervisor.go

@@ -1,12 +1,10 @@
 package supervisor
 
 import (
-	"bufio"
 	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io"
 	"log/slog"
 	"net"
 	"os"
@@ -104,6 +102,12 @@ type Shard struct {
 	ID   string
 	Spec engines.ShardSpec
 
+	// outStop ends the followers of the processes' output files, and
+	// outDone is their having read to the end.
+	outStop chan struct{}
+	outOnce sync.Once
+	outDone sync.WaitGroup
+
 	mu       sync.Mutex
 	state    State
 	pid      int
@@ -248,6 +252,7 @@ func (s *Supervisor) Start(ctx context.Context, id string, spec engines.ShardSpe
 		logs:    newRingBuffer(s.cfg.LogLines),
 		started: time.Now(),
 		done:    make(chan struct{}),
+		outStop: make(chan struct{}),
 	}
 	s.shards[id] = sh
 	s.mu.Unlock()
@@ -315,14 +320,15 @@ func (s *Supervisor) launch(ctx context.Context, sh *Shard, cmds []engines.Comma
 	// CommandContext kills only the leader, so replace that with a group kill.
 	c.Cancel = func() error { return killGroup(c.Process.Pid, syscall.SIGKILL) }
 
-	stdout, err := c.StdoutPipe()
+	out, err := s.openOutput(sh.ID, "")
 	if err != nil {
 		cancel()
 		return err
 	}
-	c.Stderr = c.Stdout.(io.Writer) // interleave, as the engine writes them
-
-	if err := c.Start(); err != nil {
+	c.Stdout, c.Stderr = out, out // interleaved, as the engine writes them
+	err = c.Start()
+	out.Close() // the process holds its own
+	if err != nil {
 		cancel()
 		return fmt.Errorf("starting %s: %w", cmd.Path, err)
 	}
@@ -339,7 +345,8 @@ func (s *Supervisor) launch(ctx context.Context, sh *Shard, cmds []engines.Comma
 			"shard", sh.ID, "err", err)
 	}
 
-	go s.pump(sh, stdout, cmd.Name)
+	sh.outDone.Add(1)
+	go s.follow(sh, s.outputPath(sh.ID, ""), cmd.Name)
 	go s.wait(sh)
 	return nil
 }
@@ -353,16 +360,18 @@ func (s *Supervisor) spawn(ctx context.Context, sh *Shard, c engines.Command) (*
 	s.dropTo(proc)
 	proc.Cancel = func() error { return killGroup(proc.Process.Pid, syscall.SIGKILL) }
 
-	stdout, err := proc.StdoutPipe()
+	out, err := s.openOutput(sh.ID, c.Name)
 	if err != nil {
 		return nil, err
 	}
-	proc.Stderr = proc.Stdout.(io.Writer)
-
-	if err := proc.Start(); err != nil {
+	proc.Stdout, proc.Stderr = out, out
+	err = proc.Start()
+	out.Close()
+	if err != nil {
 		return nil, fmt.Errorf("starting %s: %w", c.Path, err)
 	}
-	go s.pump(sh, stdout, c.Name)
+	sh.outDone.Add(1)
+	go s.follow(sh, s.outputPath(sh.ID, c.Name), c.Name)
 	// Reaped so it does not become a zombie; its exit does not end the shard.
 	go func() { _ = proc.Wait() }()
 	return proc, nil
@@ -395,24 +404,6 @@ func waitForPort(ctx context.Context, addr string, timeout time.Duration) (err e
 }
 
 // pump copies a process's output into the ring buffer and the log.
-func (s *Supervisor) pump(sh *Shard, r io.Reader, name string) {
-	sc := bufio.NewScanner(r)
-	// Engine tracebacks and progress bars produce long lines; the default
-	// 64 KiB limit truncates them exactly when they matter.
-	sc.Buffer(make([]byte, 0, 64<<10), 1<<20)
-
-	for sc.Scan() {
-		line := sc.Text()
-		if name != "" {
-			// Prefixed so the two processes of a Ray shard stay distinguishable
-			// in a single log tail.
-			line = "[" + name + "] " + line
-		}
-		sh.logs.add(line)
-		s.log.Debug("engine", "shard", sh.ID, "line", line)
-	}
-}
-
 // wait reaps the process and records why it ended.
 func (s *Supervisor) wait(sh *Shard) {
 	defer close(sh.done)
@@ -440,6 +431,7 @@ func (s *Supervisor) wait(sh *Shard) {
 	final, code := sh.state, sh.exitCode
 	sh.mu.Unlock()
 
+	s.stopOutput(sh)
 	s.removeState(sh)
 	if final == Failed {
 		s.log.Error("shard failed", "shard", sh.ID, "exit_code", code, "err", err,
@@ -760,6 +752,7 @@ func (s *Supervisor) writeState(sh *Shard) error {
 
 func (s *Supervisor) removeState(sh *Shard) {
 	_ = os.Remove(s.statePath(sh.ID))
+	s.removeOutput(sh.ID)
 }
 
 // Orphan is an engine process left behind by a previous agent.
@@ -838,15 +831,18 @@ func (s *Supervisor) Adopt(o Orphan) (*Shard, error) {
 		logs:    newRingBuffer(s.cfg.LogLines),
 		started: o.StartedAt,
 		done:    make(chan struct{}),
+		outStop: make(chan struct{}),
 		adopted: true,
 		cmdline: o.Cmdline,
 	}
 	s.shards[o.ShardID] = sh
 	s.mu.Unlock()
 
-	// Output is gone with the previous agent; say so rather than presenting an
-	// empty log as if the engine had been silent.
-	sh.logs.add("[adopted from a previous agent; earlier output is not available]")
+	// Its output file is read from the start: what it wrote under the
+	// previous agent is there, and what it writes now goes on arriving.
+	sh.logs.add("[adopted from a previous agent]")
+	sh.outDone.Add(1)
+	go s.follow(sh, s.outputPath(sh.ID, ""), "")
 
 	go s.poll(sh)
 	return sh, nil
@@ -874,6 +870,7 @@ func (s *Supervisor) poll(sh *Shard) {
 		}
 		sh.mu.Unlock()
 
+		s.stopOutput(sh)
 		s.removeState(sh)
 		s.log.Info("adopted shard exited", "shard", sh.ID, "expected", expected)
 		return
@@ -900,6 +897,7 @@ func (s *Supervisor) KillOrphan(o Orphan) error {
 	}
 	// An already-missing state file is success: the previous agent may have
 	// reaped the process itself between the scan and this call.
+	s.removeOutput(o.ShardID)
 	if err := os.Remove(s.statePath(o.ShardID)); err != nil && !errors.Is(err, os.ErrNotExist) {
 		return err
 	}

internal/agent/supervisor/supervisor_test.go

@@ -1,6 +1,7 @@
 package supervisor
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -905,3 +906,78 @@ func TestAnAdoptedShardsComputeIsKeptWithoutCrashing(t *testing.T) {
 		t.Fatalf("lost: %+v", again)
 	}
 }
+
+func TestAnAdoptedEngineGoesOnWritingAndItsEarlierOutputIsKept(t *testing.T) {
+	// An engine's output went to a pipe of the agent's. The agent that
+	// restarted and adopted the engine left that pipe with no reader, and
+	// the engine's next write past the pipe's buffer failed with EPIPE —
+	// which, in a Python engine, raised inside whatever was being reported
+	// on and failed the request. Output goes to a file now: a reader is not
+	// something a file can lose, and the lines from before the restart are
+	// there for the agent after it.
+	s, _ := newSupervisor(t)
+	// 256 KiB at once outgrows a pipe's buffer; a reader gone means EPIPE.
+	sh, err := s.Start(t.Context(), "a", engines.ShardSpec{ReplicaID: "r"},
+		shellCommand(`echo before-restart; sleep 1; head -c 262144 /dev/zero | tr '\0' x; echo; echo after-restart-done; sleep 30`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	eventually(t, 3*time.Second, "the first line was never captured", func() bool {
+		return strings.Contains(strings.Join(sh.Logs(10), "\n"), "before-restart")
+	})
+	// The agent goes away without stopping the engine: nothing reads the
+	// output between here and the adoption.
+	pid := sh.Status().PID
+	sh.outOnce.Do(func() { close(sh.outStop) })
+	sh.outDone.Wait()
+
+	s2, err := New(Config{WorkDir: s.cfg.WorkDir, StopTimeout: 3 * time.Second, LogLines: 64},
+		&scriptedHealth{}, slog.New(slog.DiscardHandler))
+	if err != nil {
+		t.Fatal(err)
+	}
+	orphans, _ := s2.FindOrphans()
+	adopted, err := s2.Adopt(orphans[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	eventually(t, 5*time.Second, "the engine's output after the restart never arrived: "+strings.Join(adopted.Logs(5), " | "), func() bool {
+		return strings.Contains(strings.Join(adopted.Logs(64), "\n"), "after-restart-done")
+	})
+	if !strings.Contains(strings.Join(adopted.Logs(64), "\n"), "before-restart") {
+		t.Error("the output from before the restart is not in the adopted log")
+	}
+	if !processAlive(pid) {
+		t.Fatal("the engine died writing output nobody was reading")
+	}
+	if err := s2.Stop(t.Context(), "a"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := os.Stat(s2.outputPath("a", "")); !errors.Is(err, os.ErrNotExist) {
+		t.Errorf("the output file was not removed with the shard: %v", err)
+	}
+}
+
+func TestAnOutputFileIsEmptiedPastItsBound(t *testing.T) {
+	s, _ := newSupervisor(t)
+	path := s.outputPath("a", "")
+	// A file already past the bound, as a long-running engine leaves one.
+	big, _ := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0o644)
+	_, _ = big.Write(bytes.Repeat([]byte("x"), maxOutputBytes+1))
+	big.Close()
+	sh := &Shard{ID: "a", logs: newRingBuffer(8), done: make(chan struct{}), outStop: make(chan struct{})}
+	sh.outDone.Add(1)
+	go s.follow(sh, path, "")
+	time.Sleep(300 * time.Millisecond)
+	f, _ := os.OpenFile(path, os.O_WRONLY|os.O_APPEND, 0o644)
+	_, _ = f.WriteString("still here\n")
+	f.Close()
+	s.stopOutput(sh)
+	st, _ := os.Stat(path)
+	if st.Size() > 1024 {
+		t.Errorf("the file was not emptied: %d bytes", st.Size())
+	}
+	if !strings.Contains(strings.Join(sh.Logs(8), "\n"), "still here") {
+		t.Errorf("a line written after the file was emptied was lost: %v", sh.Logs(8))
+	}
+}

internal/cli/clustersettings.go

@@ -243,6 +243,10 @@ var liveSettings = []string{
 	"firewall", "firewall_networks",
 	// Sent to the nodes' agents as they change.
 	"agents",
+	// Read by the leader's presets pass each time it runs.
+	"presets",
+	// Handed to the reconciler as they change.
+	"on_demand",
 	// Read by server init, node add and backups, not by the server.
 	"backup_recipients", "backup_copy_to",
 }

internal/cli/comfyuigate.go

@@ -0,0 +1,49 @@
+package cli
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/spf13/cobra"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/comfy"
+)
+
+// comfyKeyEnv carries the replica's key to the gate: the environment, which
+// only the engine's user and root can read, rather than the command line,
+// which every user on the node can.
+const comfyKeyEnv = "LLMGW_ENGINE_KEY"
+
+func newComfyUIGateCmd() *cobra.Command {
+	var cfg comfy.GateConfig
+	cmd := &cobra.Command{
+		Use:    "comfyui-gate [flags] [-- main.py flags]",
+		Short:  "Run ComfyUI as an engine: behind a key, on the loopback (started by the agent)",
+		Hidden: true,
+		Long: "Started by the node agent for a replica whose engine is comfyui. ComfyUI asks\n" +
+			"nobody for a key, so it listens on the loopback only and this gate on the\n" +
+			"replica's port, letting through, with the replica's key, only what the router\n" +
+			"asks of it. It also lays the fetched weights out where ComfyUI looks for them.",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx, stop := signal.NotifyContext(cmd.Context(), syscall.SIGINT, syscall.SIGTERM)
+			defer stop()
+			cfg.Key = os.Getenv(comfyKeyEnv)
+			_ = os.Unsetenv(comfyKeyEnv)
+			cfg.Args = args
+			cfg.Log = logger()
+			return comfy.RunGate(ctx, cfg)
+		},
+	}
+	f := cmd.Flags()
+	f.StringVar(&cfg.Listen, "listen", "", "the replica's address")
+	f.StringVar(&cfg.Model, "model", "", "the model's name, for /v1/models")
+	f.StringVar(&cfg.Weights, "weights", "", "the fetched weights: a file or a directory")
+	f.StringVar(&cfg.State, "state", "", "the replica's own directory")
+	f.StringVar(&cfg.Python, "python", "python3", "the interpreter of ComfyUI's environment")
+	f.StringVar(&cfg.Dir, "comfyui", "", "ComfyUI's directory, where main.py is")
+	for _, n := range []string{"listen", "weights", "state", "comfyui"} {
+		_ = cmd.MarkFlagRequired(n)
+	}
+	return cmd
+}

internal/cli/ctl.go

@@ -178,6 +178,7 @@ func newCtlCmd() *cobra.Command {
 		newRetryCmd(client),
 		newUpgradeCmd(client),
 		newJobsCmd(client, &asJSON),
+		newMeshJobsCmd(client, &asJSON),
 		newEngineCheckCmd(),
 		newEngineBuildCmd(client),
 		newToolCheckCmd(client),
@@ -331,6 +332,9 @@ func modelStatus(m adminapi.ModelView) string {
 		return "stopped"
 	case m.Ready >= m.Min && m.Min > 0:
 		return "ready"
+	case m.Min == 0 && m.Ready > 0 && m.Ready >= m.Total:
+		// Asked for, and up until it goes unused for long enough.
+		return "ready (on demand)"
 	case m.Total > m.Ready:
 		return "starting"
 	default:

internal/cli/ctl_3d.go

@@ -0,0 +1,130 @@
+package cli
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"time"
+
+	"github.com/spf13/cobra"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+)
+
+// newMeshJobsCmd is the 3D models clients asked for, as jobs: every owner's,
+// what each is doing, and a way to stop one. (ctl jobs is the control
+// plane's own work, serving and updating models.)
+func newMeshJobsCmd(client func() *ctlClient, asJSON *bool) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "3d",
+		Short: "3D models clients asked for: the jobs, how far along each is, and stopping one",
+	}
+	var status string
+	var limit int
+	list := &cobra.Command{
+		Use:   "list",
+		Short: "Every owner's 3D jobs, newest first",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			q := url.Values{}
+			if status != "" {
+				q.Set("status", status)
+			}
+			if limit > 0 {
+				q.Set("limit", fmt.Sprint(limit))
+			}
+			var jobs []adminapi.JobView
+			if err := client().get(cmd.Context(), "/api/v1/client-jobs?"+q.Encode(), &jobs); err != nil {
+				return err
+			}
+			if *asJSON {
+				return emitJSON(jobs)
+			}
+			if len(jobs) == 0 {
+				fmt.Fprintln(cmd.OutOrStdout(), "no 3D jobs")
+				return nil
+			}
+			w := tabTo(cmd.OutOrStdout())
+			fmt.Fprintln(w, "JOB\tMODEL\tSTATUS\tPROGRESS\tOWNER\tASKED")
+			for _, j := range jobs {
+				fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s ago\n", j.ID, j.Model, j.Status, progressText(j),
+					j.Owner, time.Since(j.CreatedAt).Round(time.Second))
+			}
+			return w.Flush()
+		},
+	}
+	list.Flags().StringVar(&status, "status", "", "only jobs in this status: queued, running, completed, failed…")
+	list.Flags().IntVar(&limit, "limit", 0, "the most jobs to show (50)")
+	get := &cobra.Command{
+		Use:   "get JOB",
+		Short: "One 3D job: its status, progress, result or error",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var j adminapi.JobView
+			if err := client().get(cmd.Context(), "/api/v1/client-jobs/"+url.PathEscape(args[0]), &j); err != nil {
+				return err
+			}
+			if *asJSON {
+				return emitJSON(j)
+			}
+			out := cmd.OutOrStdout()
+			fmt.Fprintf(out, "job       %s\nmodel     %s\nstatus    %s\n", j.ID, j.Model, j.Status)
+			if p := progressText(j); p != "" {
+				fmt.Fprintf(out, "progress  %s\n", p)
+			}
+			fmt.Fprintf(out, "owner     %s (key %s)\nasked     %s\n", j.Owner, j.KeyID, j.CreatedAt.UTC().Format(time.RFC3339))
+			if j.FinishedAt != nil && j.StartedAt != nil {
+				fmt.Fprintf(out, "took      %s\n", j.FinishedAt.Sub(*j.StartedAt).Round(time.Second))
+			}
+			if j.OutputFileID != "" {
+				fmt.Fprintf(out, "result    %s (%s)\n", j.OutputFileID, j.ContentType)
+			}
+			if j.Error != "" {
+				fmt.Fprintf(out, "error     %s\n", j.Error)
+			}
+			return nil
+		},
+	}
+	cancel := &cobra.Command{
+		Use:   "cancel JOB",
+		Short: "Stop a 3D job, in the engine's queue too",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var j adminapi.JobView
+			if err := client().post(cmd.Context(), "/api/v1/client-jobs/"+url.PathEscape(args[0])+"/cancel", nil, &j); err != nil {
+				return err
+			}
+			fmt.Fprintf(cmd.OutOrStdout(), "%s is %s\n", j.ID, j.Status)
+			return nil
+		},
+	}
+	cmd.AddCommand(list, get, cancel)
+	return cmd
+}
+
+// progressText is a job's progress as a person reads it.
+func progressText(j adminapi.JobView) string {
+	if len(j.Progress) == 0 {
+		return ""
+	}
+	var p struct {
+		State     string `json:"state"`
+		Ahead     int    `json:"ahead"`
+		NodeClass string `json:"node_class"`
+		Step      int    `json:"step"`
+		Steps     int    `json:"steps"`
+		Percent   int    `json:"percent"`
+	}
+	if json.Unmarshal(j.Progress, &p) != nil {
+		return ""
+	}
+	switch {
+	case p.State == "queued" && p.Ahead > 0:
+		return fmt.Sprintf("queued, %d ahead", p.Ahead)
+	case p.State == "running" && p.Steps > 0:
+		return fmt.Sprintf("running %d%%, %s step %d/%d", p.Percent, p.NodeClass, p.Step, p.Steps)
+	case p.State == "running" && p.NodeClass != "":
+		return "running " + p.NodeClass
+	}
+	return p.State
+}

internal/cli/ctl_request.go

@@ -56,6 +56,12 @@ func newRequestCmd(client func() *ctlClient, asJSON *bool) *cobra.Command {
 			fmt.Fprintf(out, "status    %d\n", v.Status)
 			fmt.Fprintf(out, "time      %d ms total: %d queued, %d to the first token\n", v.LatencyMs, v.QueueMs, v.TTFTMs)
 			fmt.Fprintf(out, "tokens    %d in, %d out\n", v.PromptTokens, v.CompletionTokens)
+			if v.Images > 0 {
+				fmt.Fprintf(out, "images    %d\n", v.Images)
+			}
+			if v.Meshes > 0 {
+				fmt.Fprintf(out, "meshes    %d\n", v.Meshes)
+			}
 			if v.CacheHit {
 				fmt.Fprintf(out, "cache     answered from the project's answer cache: nothing generated, nothing charged\n")
 			}

internal/cli/ctl_upgrade.go

@@ -268,6 +268,26 @@ func upgradeNodes(ctx context.Context, out io.Writer, client func() *ctlClient,
 	}
 	fmt.Fprintf(out, "%d node(s) upgraded to %s in %s, %d already on it\n",
 		done, v, time.Since(start).Round(time.Second), skipped)
+	// Checked at the end, against what the control plane says now: a node
+	// that is not on the version is said by name, and the command fails. A
+	// site's nodes stayed a release behind with nothing printed to say so.
+	if len(nodes) == 0 {
+		fmt.Fprintln(out, "This control plane has no nodes registered, so none were upgraded.")
+	}
+	var now []adminapi.NodeView
+	if err := client().get(ctx, "/api/v1/nodes", &now); err == nil {
+		var behind []string
+		for _, n := range now {
+			if (len(only) == 0 || slices.Contains(only, n.ID)) && n.AgentVersion != v {
+				behind = append(behind, fmt.Sprintf("%s (%s, %s)", n.ID, orUnknown(n.AgentVersion), n.State))
+			}
+		}
+		if len(behind) > 0 {
+			slices.Sort(behind)
+			return fmt.Errorf("not on %s: %s\nrun this again to try them, or `llmgw ctl logs NODE` for why",
+				v, strings.Join(behind, ", "))
+		}
+	}
 	// The one machine this does not reach. Said every time, because it is
 	// exactly the kind of thing that stays three versions behind unnoticed.
 	fmt.Fprintf(out, "The model mirror's host is not upgraded by this; on it, run:\n"+

internal/cli/ctl_upgrade_test.go

@@ -150,3 +150,54 @@ func TestABinaryInstalledByHandIsNotAServerRunningIt(t *testing.T) {
 		}
 	}
 }
+
+func TestAnUpgradeThatFindsNoNodesSaysSo(t *testing.T) {
+	// A site's nodes stayed a release behind with nothing printed to say
+	// that none had been reached.
+	f := &fakeFleet{versions: map[string]string{}}
+	srv := f.server(t)
+	var out bytes.Buffer
+	if err := upgradeNodes(t.Context(), &out, func() *ctlClient { return newCtlClient(srv.URL) }, "v1.0.1", nil, time.Second, 1); err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(out.String(), "no nodes registered") {
+		t.Errorf("output:\n%s", out.String())
+	}
+}
+
+func TestAnUpgradeFailsNamingANodeLeftBehind(t *testing.T) {
+	// A node that joins, or comes back on its old binary, while the waves
+	// run is found at the end rather than passed over.
+	f := &fakeFleet{versions: map[string]string{"a": "v1.0.0"}}
+	srv := f.server(t)
+	late := func() *ctlClient {
+		f.mu.Lock()
+		if len(f.told) == 1 {
+			f.versions["late"] = "v1.0.0"
+		}
+		f.mu.Unlock()
+		return newCtlClient(srv.URL)
+	}
+	var out bytes.Buffer
+	err := upgradeNodes(t.Context(), &out, late, "v1.0.1", nil, 5*time.Second, 1)
+	if err == nil || !strings.Contains(err.Error(), "late (v1.0.0, ready)") {
+		t.Errorf("err %v", err)
+	}
+}
+
+func TestUpgradingAControlPlaneAloneSaysItsNodesWereNot(t *testing.T) {
+	f := &fakeFleet{versions: map[string]string{"p-g1": "v1.0.0", "p-g3": "v1.0.1"}}
+	srv := f.server(t)
+	var out bytes.Buffer
+	nodesLeftBehind(t.Context(), &out, newCtlClient(srv.URL), "v1.0.1")
+	if !strings.Contains(out.String(), "1 of 2 node(s) are not on v1.0.1") ||
+		!strings.Contains(out.String(), "ctl upgrade v1.0.1 --skip-control-plane") {
+		t.Errorf("output:\n%s", out.String())
+	}
+	out.Reset()
+	f.versions["p-g1"] = "v1.0.1"
+	nodesLeftBehind(t.Context(), &out, newCtlClient(srv.URL), "v1.0.1")
+	if out.Len() != 0 {
+		t.Errorf("said something with every node on the version: %s", out.String())
+	}
+}

internal/cli/model.go

@@ -3,6 +3,7 @@ package cli
 import (
 	"encoding/json"
 	"fmt"
+	"net/url"
 	"os"
 	"os/user"
 	"slices"
@@ -32,7 +33,7 @@ func newModelCmd(client func() *ctlClient, asJSON *bool) *cobra.Command {
 		Use:   "model",
 		Short: "Add or remove models while the cluster is running",
 	}
-	c.AddCommand(newModelAddCmd(client), newModelRemoveCmd(client), newModelPlanCmd(client),
+	c.AddCommand(newModelAddCmd(client), newModelPresetsCmd(client, asJSON), newModelRemoveCmd(client), newModelPlanCmd(client),
 		newResourcesCmd(client), newClassCmd(client), newOwnerCmd(client),
 		newTargetCmd(client, asJSON), newAdaptersCmd(client),
 		newModelServeCmd(client), newModelUpdatesCmd(client, asJSON), newModelUpdateCmd(client),
@@ -46,49 +47,74 @@ func newModelAddCmd(client func() *ctlClient) *cobra.Command {
 	var path string
 	var skipCheck bool
 	c := &cobra.Command{
-		Use:   "add -f <file.yaml>",
-		Short: "Add a model from a definition file",
-		Long: "The definition is the same YAML a model takes in server.yaml, so an\n" +
+		Use:   "add PRESET | -f <file.yaml>",
+		Short: "Add a model that comes with llmgw, or one from a definition file",
+		Long: "A preset is a model that comes with llmgw, its workflow, nodes and licence\n" +
+			"already found and tried: " + strings.Join(catalog.PresetNames(), ", ") + " (llmgw ctl model presets).\n" +
+			"Adding a ComfyUI one also has the nodes install ComfyUI, when the cluster\n" +
+			"has not been told otherwise.\n\n" +
+			"A definition is the same YAML a model takes in server.yaml, so an\n" +
 			"entry can be moved between the two by copying it.\n\n" +
 			"The catalog is rebuilt and validated before anything is written, so a\n" +
 			"definition that collides with an existing name, or names a fallback that\n" +
 			"does not exist, is refused rather than stored and then ignored on every\n" +
 			"start. Once accepted it takes effect on the reconciler's next pass — no\n" +
 			"restart — and survives one.",
-		Args: cobra.NoArgs,
-		RunE: func(cmd *cobra.Command, _ []string) error {
-			if path == "" {
-				return fmt.Errorf("--file is required: the model definition, as YAML")
-			}
-			// Read by koanf, the same parser and the same tags that read
-			// server.yaml — so an entry can be moved between the two by copying
-			// it, and a field that works in one cannot silently mean nothing in
-			// the other.
-			k := koanf.New(".")
-			if err := k.Load(file.Provider(path), yaml.Parser()); err != nil {
-				return fmt.Errorf("%s: %w", path, err)
-			}
+		Example: "  llmgw ctl model add triposr\n" +
+			"  llmgw ctl model add -f qwen.yaml",
+		Args: cobra.MaximumNArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
 			var m catalog.Model
-			if err := k.UnmarshalWithConf("", &m, koanf.UnmarshalConf{Tag: "koanf"}); err != nil {
-				return fmt.Errorf("%s: %w", path, err)
-			}
-			if m.Name == "" {
-				return fmt.Errorf("%s: the definition has no name", path)
+			switch {
+			case len(args) == 1 && path != "":
+				return fmt.Errorf("a preset or a file, not both")
+			case len(args) == 1:
+				p, ok := catalog.PresetNamed(args[0])
+				if !ok {
+					return fmt.Errorf("no preset %q: there are %s; any other model is added from a file (-f)",
+						args[0], strings.Join(catalog.PresetNames(), ", "))
+				}
+				// The control plane adds it, and keeps that it was added as
+				// a preset, by whom; one from before it could is sent the
+				// entry, as it was then.
+				var res adminapi.ModelAdded
+				err := client().post(cmd.Context(), "/api/v1/presets/"+url.PathEscape(p.Model.Name), []byte("{}"), &res)
+				if err == nil {
+					fmt.Fprintf(cmd.OutOrStdout(),
+						"%s added, and ComfyUI with it where the cluster had none. It is placed on the next\n"+
+							"reconcile pass and loads when first asked for; watch it with:\n  llmgw ctl models\n", p.Model.Name)
+					return nil
+				}
+				if !olderControlPlane(err) {
+					return err
+				}
+				m = p.Model
+			case path == "":
+				return fmt.Errorf("a preset (%s) or --file, the model definition as YAML",
+					strings.Join(catalog.PresetNames(), ", "))
+			default:
+				var err error
+				if m, err = readModelFile(path); err != nil {
+					return err
+				}
 			}
 
 			// Before the catalog is touched, because a source that does not
 			// resolve is otherwise discovered by a replica failing to start
 			// minutes later on a node — with an error naming the node rather
 			// than the typo.
+			// Every source the model's profiles load, not the model's alone.
 			if !skipCheck {
-				size, err := sourcecheck.Check(cmd.Context(), m.Source)
-				if err != nil {
-					return fmt.Errorf("%w\n  Pass --no-source-check to add it anyway, "+
-						"which is right when the mirror is not up yet or the nodes "+
-						"reach it by an address this machine does not.", err)
-				}
-				if _, isURL := sourcecheck.HTTPSource(m.Source); isURL {
-					fmt.Fprintln(cmd.OutOrStdout(), sourceNote(m.Source, size))
+				for _, src := range m.WeightSources() {
+					size, err := sourcecheck.Check(cmd.Context(), src)
+					if err != nil {
+						return fmt.Errorf("%w\n  Pass --no-source-check to add it anyway, "+
+							"which is right when the mirror is not up yet or the nodes "+
+							"reach it by an address this machine does not.", err)
+					}
+					if _, isURL := sourcecheck.HTTPSource(src); isURL {
+						fmt.Fprintln(cmd.OutOrStdout(), sourceNote(src, size))
+					}
 				}
 			}
 
@@ -104,6 +130,9 @@ func newModelAddCmd(client func() *ctlClient) *cobra.Command {
 			fmt.Fprintf(cmd.OutOrStdout(),
 				"%s added. It will be placed on the next reconcile pass; watch it with:\n"+
 					"  llmgw ctl models\n", m.Name)
+			if m.ServesComfyUI() && !m.IsExternal() {
+				return ensureComfyUI(cmd, client, m.Name)
+			}
 			return nil
 		},
 	}
@@ -113,6 +142,25 @@ func newModelAddCmd(client func() *ctlClient) *cobra.Command {
 	return c
 }
 
+// readModelFile reads a model's definition. By koanf, the same parser and
+// the same tags that read server.yaml — so an entry can be moved between the
+// two by copying it, and a field that works in one cannot silently mean
+// nothing in the other.
+func readModelFile(path string) (catalog.Model, error) {
+	var m catalog.Model
+	k := koanf.New(".")
+	if err := k.Load(file.Provider(path), yaml.Parser()); err != nil {
+		return m, fmt.Errorf("%s: %w", path, err)
+	}
+	if err := k.UnmarshalWithConf("", &m, koanf.UnmarshalConf{Tag: "koanf"}); err != nil {
+		return m, fmt.Errorf("%s: %w", path, err)
+	}
+	if m.Name == "" {
+		return m, fmt.Errorf("%s: the definition has no name", path)
+	}
+	return m, nil
+}
+
 func newModelRemoveCmd(client func() *ctlClient) *cobra.Command {
 	return &cobra.Command{
 		Use:   "remove <name>",

internal/cli/model_presets.go

@@ -0,0 +1,166 @@
+package cli
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/provision"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/catalog"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/settings"
+)
+
+func newModelPresetsCmd(client func() *ctlClient, asJSON *bool) *cobra.Command {
+	c := &cobra.Command{
+		Use:   "presets",
+		Short: "The models that come with llmgw: whether each fits and is here",
+		Long: "Each is a catalog entry whose workflow, custom nodes, packages and licence\n" +
+			"were found and tried, and whose profile says the card it needs rather than\n" +
+			"a class, so it places on any site's cards. Add one with\n" +
+			"`llmgw ctl model add NAME`.\n\n" +
+			"While presets.auto is on, the leader adds one by itself when a card fits it\n" +
+			"and the catalog has nothing that makes what it makes; one somebody removed\n" +
+			"is not added again by itself.",
+		Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			var v adminapi.PresetsView
+			err := client().get(cmd.Context(), "/api/v1/presets", &v)
+			if err != nil && !olderControlPlane(err) {
+				return err
+			}
+			if *asJSON && err == nil {
+				return emitJSON(v)
+			}
+			w := tabTo(cmd.OutOrStdout())
+			if err != nil {
+				// A control plane from before it kept them: what this
+				// release has, with nothing about the cluster.
+				fmt.Fprintln(w, "NAME\tMAKES\tCARD\tLICENCE\tWHAT IT IS FOR")
+				for _, p := range catalog.Presets() {
+					fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\n", p.Model.Name, p.Makes, presetCard(p.Model),
+						presetLicence(p.Model), p.Model.Description)
+				}
+				return w.Flush()
+			}
+			fmt.Fprintln(w, "NAME\tMAKES\tCARD\tLICENCE\tFITS\tHERE\tWHAT IT IS FOR")
+			for _, p := range v.Presets {
+				fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\t%s\n", p.Name, p.Makes, p.Card, licenceText(p.Licence),
+					orDash(strings.Join(p.FitsClasses, ",")), presetState(p), p.Description)
+			}
+			if err := w.Flush(); err != nil {
+				return err
+			}
+			if v.Auto {
+				fmt.Fprintln(cmd.OutOrStdout(), "\nAdded by themselves where a card fits (presets.auto); "+
+					"llmgw ctl model presets auto off stops it.")
+			} else {
+				fmt.Fprintln(cmd.OutOrStdout(), "\nNot added by themselves; llmgw ctl model presets auto on starts it.")
+			}
+			return nil
+		},
+	}
+	c.AddCommand(&cobra.Command{
+		Use:       "auto on|off",
+		Short:     "Whether the leader adds a preset by itself where a card fits it",
+		Args:      cobra.ExactArgs(1),
+		ValidArgs: []string{"on", "off"},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if args[0] != "on" && args[0] != "off" {
+				return fmt.Errorf("on or off, not %q", args[0])
+			}
+			body, _ := json.Marshal(adminapi.PresetsAutoRequest{On: args[0] == "on"})
+			var v adminapi.PresetsView
+			if err := client().put(cmd.Context(), "/api/v1/presets/auto", body, &v); err != nil {
+				return err
+			}
+			if v.Auto {
+				fmt.Fprintln(cmd.OutOrStdout(), "Presets are added by themselves where a card fits.")
+			} else {
+				fmt.Fprintln(cmd.OutOrStdout(), "Presets are no longer added by themselves.")
+			}
+			return nil
+		},
+	})
+	return c
+}
+
+// olderControlPlane is an error from a control plane that has no such path:
+// one from before it was added.
+func olderControlPlane(err error) bool {
+	s := err.Error()
+	return strings.Contains(s, "answered with a page") || strings.HasPrefix(s, "404 Not Found: 404 page not found")
+}
+
+func presetState(p adminapi.PresetView) string {
+	switch {
+	case p.InCatalog && p.AddedBy == "auto":
+		return "added by itself"
+	case p.InCatalog && p.AddedBy != "":
+		return "added by " + p.AddedBy
+	case p.InCatalog:
+		return "here"
+	case p.Declined:
+		return "removed; stays out"
+	}
+	return "—"
+}
+
+func licenceText(l catalog.License) string {
+	if l.Commercial != nil && !*l.Commercial {
+		return l.Name + ", not commercial"
+	}
+	return l.Name
+}
+
+func presetCard(m catalog.Model) string {
+	if len(m.Profiles) == 0 || m.Profiles[0].GPU == nil {
+		return "—"
+	}
+	return m.Profiles[0].GPU.String()
+}
+
+func presetLicence(m catalog.Model) string {
+	if m.License == nil {
+		return "—"
+	}
+	l := m.License.Name
+	if c := m.License.Commercial; c != nil && !*c {
+		l += ", not commercial"
+	}
+	return l
+}
+
+// ensureComfyUI has the nodes install ComfyUI for a model that needs it,
+// unless the cluster names a version already, or none on purpose.
+func ensureComfyUI(cmd *cobra.Command, client func() *ctlClient, model string) error {
+	out := cmd.OutOrStdout()
+	path := []string{"engines", catalog.EngineComfyUI}
+	var cur adminapi.SettingsView
+	if err := client().get(cmd.Context(), "/api/v1/settings", &cur); err != nil {
+		return err
+	}
+	doc, err := settings.FromBytes("settings", []byte(cur.Body))
+	if err != nil {
+		return err
+	}
+	version := provision.ComfyUIVersion()
+	if n := doc.Node(path); n != nil {
+		if n.Value == "" {
+			fmt.Fprintf(out, "engines.comfyui is set to none, so the nodes install no ComfyUI for it: set a version "+
+				"(llmgw ctl config set engines.comfyui %s) or name one installed by hand in agent.yaml\n", version)
+		}
+		return nil
+	}
+	fmt.Fprintf(out, "Nodes with an NVIDIA GPU install ComfyUI %s for it, about 10 GB each:\n", version)
+	if err := doc.SetYAML(path, version); err != nil {
+		return err
+	}
+	b, err := doc.Bytes()
+	if err != nil {
+		return err
+	}
+	return putSettings(cmd, client, cur, b, "ComfyUI for "+model)
+}

internal/cli/model_presets_test.go

@@ -0,0 +1,128 @@
+package cli
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/catalog"
+)
+
+// presetAdmin is an admin API holding settings, which records the models
+// added and the settings put.
+type presetAdmin struct {
+	// api is a control plane that adds presets itself; without it, one
+	// from before, which answers their paths with a 404.
+	api      bool
+	byAPI    []string
+	mu       sync.Mutex
+	settings string
+	added    []catalog.Model
+	put      []string
+}
+
+func (a *presetAdmin) client(t *testing.T) func() *ctlClient {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		a.mu.Lock()
+		defer a.mu.Unlock()
+		body, _ := io.ReadAll(r.Body)
+		w.Header().Set("Content-Type", "application/json")
+		switch {
+		case a.api && r.Method == http.MethodPost && strings.HasPrefix(r.URL.Path, "/api/v1/presets/"):
+			name := strings.TrimPrefix(r.URL.Path, "/api/v1/presets/")
+			a.byAPI = append(a.byAPI, name)
+			_ = json.NewEncoder(w).Encode(adminapi.ModelAdded{Added: name})
+		case r.Method == http.MethodPost && r.URL.Path == "/api/v1/models":
+			var m catalog.Model
+			_ = json.Unmarshal(body, &m)
+			a.added = append(a.added, m)
+			_ = json.NewEncoder(w).Encode(map[string]string{"name": m.Name})
+		case r.Method == http.MethodGet && r.URL.Path == "/api/v1/settings":
+			_ = json.NewEncoder(w).Encode(adminapi.SettingsView{Version: 1, Body: a.settings})
+		case r.Method == http.MethodPut && r.URL.Path == "/api/v1/settings":
+			var req adminapi.SettingsRequest
+			_ = json.Unmarshal(body, &req)
+			a.put = append(a.put, req.Body)
+			a.settings = req.Body
+			_ = json.NewEncoder(w).Encode(adminapi.SettingsView{Version: 2, Body: req.Body})
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	t.Cleanup(srv.Close)
+	return func() *ctlClient { return newCtlClient(strings.TrimPrefix(srv.URL, "http://"), "") }
+}
+
+func runModelAdd(t *testing.T, client func() *ctlClient, args ...string) (string, error) {
+	t.Helper()
+	cmd := newModelAddCmd(client)
+	var out bytes.Buffer
+	cmd.SetOut(&out)
+	cmd.SetErr(&out)
+	cmd.SetArgs(append(args, "--no-source-check"))
+	err := cmd.ExecuteContext(t.Context())
+	return out.String(), err
+}
+
+func TestAPresetIsAddedByTheControlPlane(t *testing.T) {
+	a := &presetAdmin{api: true}
+	out, err := runModelAdd(t, a.client(t), "triposr")
+	if err != nil {
+		t.Fatalf("%v\n%s", err, out)
+	}
+	if len(a.byAPI) != 1 || a.byAPI[0] != "triposr" || len(a.added) != 0 || len(a.put) != 0 {
+		t.Errorf("by the API %v; sent the entry %v; settings %v", a.byAPI, a.added, a.put)
+	}
+}
+
+// A control plane from before presets were its own is sent the entry, and
+// ComfyUI set beside it, as the release that brought presets did.
+func TestAPresetIsAddedByNameAndHasTheNodesInstallComfyUI(t *testing.T) {
+	a := &presetAdmin{settings: "router:\n  retries: 2\n"}
+	out, err := runModelAdd(t, a.client(t), "triposr")
+	if err != nil {
+		t.Fatalf("%v\n%s", err, out)
+	}
+	if len(a.added) != 1 || a.added[0].Name != "triposr" || a.added[0].ComfyUI.Workflow != "triposr" {
+		t.Fatalf("added %+v", a.added)
+	}
+	if len(a.put) != 1 || !strings.Contains(a.put[0], "comfyui: 0.39.2") || !strings.Contains(a.put[0], "retries: 2") {
+		t.Fatalf("settings put %q", a.put)
+	}
+	if !strings.Contains(out, "install ComfyUI 0.39.2") {
+		t.Errorf("not said:\n%s", out)
+	}
+}
+
+func TestAClusterThatNamesItsComfyUIKeepsIt(t *testing.T) {
+	for _, settings := range []string{"engines:\n  comfyui: 0.38.0\n", "engines:\n  comfyui: \"\"\n"} {
+		a := &presetAdmin{settings: settings}
+		out, err := runModelAdd(t, a.client(t), "flux-schnell")
+		if err != nil {
+			t.Fatalf("%v\n%s", err, out)
+		}
+		if len(a.put) != 0 {
+			t.Errorf("%q: settings changed to %q", settings, a.put)
+		}
+		if none := strings.Contains(settings, `""`); none != strings.Contains(out, "set to none") {
+			t.Errorf("%q: %s", settings, out)
+		}
+	}
+}
+
+func TestAnUnknownPresetNamesTheOnesThereAre(t *testing.T) {
+	a := &presetAdmin{}
+	_, err := runModelAdd(t, a.client(t), "sdxl")
+	if err == nil || !strings.Contains(err.Error(), "flux-schnell, triposr") || len(a.added) != 0 {
+		t.Errorf("%v, added %v", err, a.added)
+	}
+	if _, err := runModelAdd(t, a.client(t), "triposr", "-f", "x.yaml"); err == nil {
+		t.Error("a preset and a file were both taken")
+	}
+}

internal/cli/model_serve.go

@@ -60,6 +60,8 @@ func newModelServeCmd(client func() *ctlClient) *cobra.Command {
 	f.StringVar(&req.Quant, "quant", "", "the quantisation to serve (default: the one that suits the cluster best)")
 	f.StringVar(&req.File, "file", "", "the file to serve, instead of choosing by --quant")
 	f.StringVar(&req.Projector, "projector", "", "a vision model's mmproj file, fetched and loaded beside it")
+	f.BoolVar(&req.Embeddings, "embeddings", false, "serve it as an embedding model (its GGUF header says so for most): "+
+		"--embedding, 32 slots of 1024 tokens unless --ctx-pool or --context-length says otherwise")
 	f.StringVar(&req.Format, "format", "gguf", "gguf, run by llama.cpp, or safetensors: the original weights, run by vLLM on GPUs")
 	f.BoolVar(&req.CPU, "cpu", false, "run it on the CPU, whatever the plan says")
 	f.StringVar(&req.GPUClass, "gpu-class", "", "run it on GPUs of this class, whatever the plan says")

internal/cli/root.go

@@ -54,6 +54,7 @@ func Root() *cobra.Command {
 		newMirrorCmd(),
 		newBundleCmd(),
 		newSimEngineCmd(),
+		newComfyUIGateCmd(),
 		newDoctorCmd(),
 		newNodeCmd(),
 		newSelfUpgradeCmd(),

internal/cli/selfupgrade.go

@@ -1,8 +1,11 @@
 package cli
 
 import (
+	"context"
 	"errors"
 	"fmt"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+	"io"
 	"os"
 	"os/exec"
 	"runtime"
@@ -70,6 +73,9 @@ func newSelfUpgradeCmd() *cobra.Command {
 				if strings.TrimSpace(string(b)) == "active" {
 					if steady++; steady >= 3 {
 						fmt.Fprintf(out, "%s restarted and running\n", service)
+						if service == "llmgw-server" {
+							nodesLeftBehind(cmd.Context(), out, newCtlClient("127.0.0.1:9090"), v)
+						}
 						return nil
 					}
 				} else {
@@ -85,3 +91,25 @@ func newSelfUpgradeCmd() *cobra.Command {
 	c.Flags().StringVar(&service, "service", "", "the systemd unit to restart afterwards, e.g. llmgw-mirror")
 	return c
 }
+
+// nodesLeftBehind says, after a control plane alone was upgraded, that its
+// nodes were not, and how they are: this command looks like the cluster's
+// upgrade and is not, and a site's nodes stayed a release behind after it.
+func nodesLeftBehind(ctx context.Context, out io.Writer, c *ctlClient, v string) {
+	var nodes []adminapi.NodeView
+	_ = c.patient(20*time.Second).get(ctx, "/api/v1/nodes", &nodes)
+	behind := 0
+	for _, n := range nodes {
+		if n.AgentVersion != v {
+			behind++
+		}
+	}
+	switch {
+	case len(nodes) == 0:
+		fmt.Fprintf(out, "This upgraded this machine only. The nodes are upgraded from the leading "+
+			"control plane with:\n  sudo llmgw ctl upgrade %s --skip-control-plane\n", v)
+	case behind > 0:
+		fmt.Fprintf(out, "This upgraded this machine only: %d of %d node(s) are not on %s. On the leading "+
+			"control plane, run:\n  sudo llmgw ctl upgrade %s --skip-control-plane\n", behind, len(nodes), v, v)
+	}
+}

internal/cli/server.go

@@ -210,6 +210,10 @@ func newServerCmd() *cobra.Command {
 			if err != nil {
 				return err
 			}
+			if st := rt.Store(); st != nil {
+				// Each control plane raises the same events; one sends each.
+				notifier.SetClaimer(st)
+			}
 			rt.SetNotifier(notifier)
 			if gate != nil && notifier != nil {
 				gate.SetJudgeAlarm(func(model string, err error) {
@@ -260,6 +264,7 @@ func newServerCmd() *cobra.Command {
 				agentSvc = svc
 				// Stopped by the operators (llmgw stop): nothing placed.
 				ctl.Reconciler().SetStopped(cfg.Serving.Stopped)
+				ctl.Reconciler().SetEvictionTimes(cfg.OnDemand.EvictAfterIdle, cfg.OnDemand.MinLifetime)
 				// Whether nodes keep llmgw's firewall, as the settings say now.
 				svc.SetFirewall(func() *llmgwv1.Firewall {
 					c := current.Load()
@@ -461,6 +466,14 @@ func newServerCmd() *cobra.Command {
 					}
 					api.SetModels(svc)
 					catalogSvc = svc
+					// The models that come with llmgw: added by the leader
+					// when a node fits one and the catalog makes nothing of
+					// its kind, unless somebody removed it or turned it off.
+					api.SetPresets(st, func() adminapi.PresetConfig {
+						c := current.Load()
+						return adminapi.PresetConfig{Auto: c.Presets.Auto, ComfyUI: c.Engines[catalog.EngineComfyUI]}
+					})
+					go runPresetsPass(ctx, api, admin.Leadership(), log)
 					// And the mirror page, so a model that has just been
 					// fetched can be served without writing YAML by hand.
 					rt.SetCatalogAdmin(svc)
@@ -766,6 +779,9 @@ func newServerCmd() *cobra.Command {
 							fwPub.Kick()
 						}
 					}
+					if slices.ContainsFunc(changed, func(c string) bool { return strings.HasPrefix(c, "on_demand") }) && admin != nil {
+						admin.Reconciler().SetEvictionTimes(next.OnDemand.EvictAfterIdle, next.OnDemand.MinLifetime)
+					}
 					if slices.ContainsFunc(changed, func(c string) bool { return strings.HasPrefix(c, "agents") }) && agentSvc != nil {
 						// A moment apart per node, so off this goroutine.
 						go agentSvc.BroadcastAgentSettings()
@@ -1169,18 +1185,18 @@ func servableCheck(llamaVersion string) func(context.Context, catalog.Model) err
 		if llamaVersion == "" {
 			return nil
 		}
-		usesLlama := false
+		// Each source a llama.cpp profile loads: its own, or the model's.
 		for _, p := range m.Profiles {
-			if p.Engine == "llamacpp" {
-				usesLlama = true
+			if p.Engine != "llamacpp" {
+				continue
+			}
+			url, ok := sourcecheck.HTTPSource(m.SourceOf(p))
+			if !ok || !gguf.IsGGUF(url) {
+				continue
+			}
+			if v := gguf.Check(ctx, url, llamaVersion); !v.Servable {
+				return fmt.Errorf("%s cannot be served: %s", m.Name, v.Reason)
 			}
-		}
-		url, ok := sourcecheck.HTTPSource(m.Source)
-		if !usesLlama || !ok || !gguf.IsGGUF(url) {
-			return nil
-		}
-		if v := gguf.Check(ctx, url, llamaVersion); !v.Servable {
-			return fmt.Errorf("%s cannot be served: %s", m.Name, v.Reason)
 		}
 		return nil
 	}
@@ -1277,3 +1293,32 @@ func embedder(replay func(ctx context.Context, path, model string, body []byte)
 		return res.Data[0].Embedding, nil
 	}
 }
+
+// presetsEvery is how often the leader looks for presets to add; the first
+// look waits as long, for the nodes to have registered their cards.
+const presetsEvery = time.Minute
+
+// runPresetsPass has the leader add the presets a node fits and the catalog
+// lacks, now and then.
+func runPresetsPass(ctx context.Context, api *adminapi.API, lead *control.Leadership, log *slog.Logger) {
+	t := time.NewTicker(presetsEvery)
+	defer t.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+		}
+		if lead != nil && !lead.IsLeader() {
+			continue
+		}
+		added, err := api.PresetsPass(ctx)
+		for _, name := range added {
+			log.Info("added a preset by itself: a node fits it and the catalog made nothing of its kind",
+				"model", name, "off_switch", "presets.auto")
+		}
+		if err != nil {
+			log.Warn("could not add a preset", "err", err)
+		}
+	}
+}

internal/cli/serverinit.go

@@ -73,6 +73,9 @@ type serverInit struct {
 	// patroni are user@host of the machines to keep the store on under
 	// Patroni, replicated; this machine is the third etcd vote for two.
 	patroni []string
+	// webhooks are where the cluster's alerts go: put into its settings
+	// once it runs, and each sent a test.
+	webhooks []string
 	// patroniNodes are the same machines already connected to, which the
 	// setup screen does with the password it was given; when set, patroni
 	// only names them.
@@ -182,6 +185,9 @@ func newServerInitCmd() *cobra.Command {
 		"leave the firewall alone, instead of keeping llmgw's internal ports to the cluster's networks")
 	f.BoolVar(&in.postgres, "postgres", false,
 		"keep the store in PostgreSQL on this machine, installing it and moving an existing SQLite store into it")
+	f.StringArrayVar(&in.webhooks, "webhook", nil,
+		"where alerts go — a model parked, a node lost, a budget spent: an http(s) address, Slack's, Mattermost's "+
+			"and Rocket.Chat's sent Slack's text, any other the event as JSON (slack: or json: in front says which); repeatable")
 	f.StringArrayVar(&in.patroni, "patroni", nil,
 		"user@host of a machine to keep the store on, replicated under Patroni; give two or more. "+
 			"Installs PostgreSQL, Patroni and etcd there over ssh, and moves the existing store in")
@@ -249,6 +255,9 @@ func (in *serverInit) run(ctx context.Context) error {
 			fmt.Fprintf(in.out, "  !!    firewall: %v; llmgw's ports answer every network this machine is on\n", err)
 		}
 	}
+	if err := in.ensureWebhooks(ctx); err != nil {
+		fmt.Fprintf(in.out, "  !!    webhooks: %v\n", err)
+	}
 	if in.judgeWanted() && in.configJudgesWith(guardModelName) {
 		// Not fatal: without its judge the baseline policy still checks for
 		// secrets and injection, and a judged request is served flagged.

internal/cli/serverinit_notify.go

@@ -0,0 +1,185 @@
+package cli
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/url"
+	"slices"
+	"strings"
+	"time"
+
+	"go.yaml.in/yaml/v3"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/notify"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/settings"
+)
+
+// Where the cluster says what went wrong: a model parked, a node lost, a
+// budget spent. notify.webhooks existed, and setup never asked for one, so a
+// site learnt of a lost node from its users.
+
+// parseWebhook reads a webhook as setup takes it: an address, with "slack:"
+// or "json:" in front to say what it is sent, else what its address says.
+func parseWebhook(s string) (notify.Webhook, error) {
+	s = strings.TrimSpace(s)
+	format := ""
+	for _, f := range []string{"slack", "json"} {
+		if rest, ok := strings.CutPrefix(s, f+":"); ok && !strings.HasPrefix(rest, "//") {
+			format, s = f, rest
+		}
+	}
+	u, err := url.Parse(s)
+	if err != nil || (u.Scheme != "https" && u.Scheme != "http") || u.Host == "" {
+		return notify.Webhook{}, fmt.Errorf("webhook %q: an http(s) address, with slack: or json: in front to say its format", s)
+	}
+	if format == "" {
+		format = webhookFormat(u)
+	}
+	return notify.Webhook{URL: s, Format: format}, nil
+}
+
+// webhookFormat is what an address takes: Slack's own, and the incoming
+// webhooks that read Slack's {"text": …} — Mattermost's and Rocket.Chat's
+// /hooks/, Discord's …/slack — are sent that; anything else the event as
+// JSON.
+func webhookFormat(u *url.URL) string {
+	switch {
+	case u.Host == "hooks.slack.com",
+		strings.Contains(u.Path, "/hooks/"),
+		strings.HasSuffix(u.Path, "/slack"):
+		return "slack"
+	}
+	return "json"
+}
+
+// parseWebhooks reads a list of them, by commas or as given.
+func parseWebhooks(list []string) ([]notify.Webhook, error) {
+	var out []notify.Webhook
+	for _, item := range list {
+		for _, s := range strings.Split(item, ",") {
+			if strings.TrimSpace(s) == "" {
+				continue
+			}
+			w, err := parseWebhook(s)
+			if err != nil {
+				return nil, err
+			}
+			out = append(out, w)
+		}
+	}
+	return out, nil
+}
+
+// webhookEntry is one of notify.webhooks as the settings document has it.
+type webhookEntry struct {
+	URL        string   `yaml:"url"`
+	Format     string   `yaml:"format,omitempty"`
+	Events     []string `yaml:"events,omitempty,flow"`
+	SecretFile string   `yaml:"secret_file,omitempty"`
+}
+
+// withWebhooks adds these webhooks to a settings document's notify.webhooks,
+// and says whether that changed it: one already there, by address, is left
+// as it is, with whatever events and secret it was given.
+func withWebhooks(doc *settings.Doc, add []notify.Webhook) (bool, error) {
+	path := []string{"notify", "webhooks"}
+	var list []webhookEntry
+	if n := doc.Node(path); n != nil {
+		if err := n.Decode(&list); err != nil {
+			return false, fmt.Errorf("notify.webhooks in the cluster's settings: %w", err)
+		}
+	}
+	changed := false
+	for _, w := range add {
+		if !slices.ContainsFunc(list, func(e webhookEntry) bool { return e.URL == w.URL }) {
+			list = append(list, webhookEntry{URL: w.URL, Format: w.Format})
+			changed = true
+		}
+	}
+	if !changed {
+		return false, nil
+	}
+	b, err := yaml.Marshal(list)
+	if err != nil {
+		return false, err
+	}
+	return true, doc.SetYAML(path, string(b))
+}
+
+// ensureWebhooks puts the webhooks given into the cluster's settings and
+// sends each a test, once the control plane runs on them. Said, not fatal: a
+// cluster without its alerts still serves.
+func (in *serverInit) ensureWebhooks(ctx context.Context) error {
+	if len(in.webhooks) == 0 {
+		return nil
+	}
+	hooks, err := parseWebhooks(in.webhooks)
+	if err != nil {
+		return err
+	}
+	c := in.adminAPI()
+	var cur adminapi.SettingsView
+	if err := c.get(ctx, "/api/v1/settings", &cur); err != nil {
+		return err
+	}
+	doc, err := settings.FromBytes("settings", []byte(cur.Body))
+	if err != nil {
+		return err
+	}
+	changed, err := withWebhooks(doc, hooks)
+	if err != nil {
+		return err
+	}
+	if changed {
+		b, err := doc.Bytes()
+		if err != nil {
+			return err
+		}
+		req, _ := json.Marshal(adminapi.SettingsRequest{Base: cur.Version, Body: string(b), Note: "notification webhooks, from setup"})
+		if err := c.put(ctx, "/api/v1/settings", req, &cur); err != nil {
+			return err
+		}
+		in.done("notification webhooks in the cluster's settings (version %d)", cur.Version)
+	} else {
+		in.kept("notification webhooks (already in the cluster's settings)")
+	}
+
+	// The control planes start again on the change; the test is sent by
+	// one that knows every webhook asked for.
+	var res []notify.Result
+	err = waitFor(ctx, 2*time.Minute, "the control plane to run on its webhooks", func() (bool, error) {
+		res = nil
+		if c.post(ctx, "/api/v1/notify/test", nil, &res) != nil {
+			return false, nil
+		}
+		for _, w := range hooks {
+			// Answered by host: the path of a webhook is its secret.
+			if !slices.ContainsFunc(res, func(r notify.Result) bool { return r.URL == notify.Redact(w.URL) }) {
+				return false, nil
+			}
+		}
+		return true, nil
+	})
+	if err != nil {
+		return err
+	}
+	var failed []string
+	for _, r := range res {
+		if !slices.ContainsFunc(hooks, func(w notify.Webhook) bool { return notify.Redact(w.URL) == r.URL }) {
+			continue
+		}
+		if r.Err != "" {
+			failed = append(failed, r.URL+": "+r.Err)
+			continue
+		}
+		in.done("a test notification reached %s", r.URL)
+	}
+	if len(failed) > 0 {
+		return errors.New("a test notification did not arrive: " + strings.Join(failed, "; ") +
+			" (kept in the settings: 'llmgw ctl notify test' tries again)")
+	}
+	return nil
+}

internal/cli/serverinit_notify_test.go

@@ -0,0 +1,122 @@
+package cli
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/notify"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/settings"
+)
+
+func TestAWebhooksFormatIsWhatItsAddressTakes(t *testing.T) {
+	for in, want := range map[string]string{
+		"https://hooks.slack.com/services/T1/B2/abc":            "slack",
+		"https://chat.example.com/hooks/xyz":                    "slack", // Mattermost, Rocket.Chat
+		"https://discord.com/api/webhooks/1/abc/slack":          "slack",
+		"https://alerts.example.com/llmgw":                      "json",
+		"json:https://hooks.slack.com/services/T1/B2/abc":       "json",
+		"slack:https://alerts.example.com/llmgw":                "slack",
+		"  https://events.pagerduty.com/integration/x/enqueue ": "json",
+	} {
+		w, err := parseWebhook(in)
+		if err != nil || w.Format != want || strings.HasPrefix(w.URL, "slack:") || strings.HasPrefix(w.URL, "json:") {
+			t.Errorf("%q: %+v %v, want %s", in, w, err, want)
+		}
+	}
+	for _, bad := range []string{"hooks.slack.com/x", "ftp://example.com/x", "slack:", "https://"} {
+		if _, err := parseWebhook(bad); err == nil {
+			t.Errorf("%q was taken", bad)
+		}
+	}
+}
+
+func TestWebhooksAreAddedToTheSettingsBesideTheOnesThere(t *testing.T) {
+	doc, err := settings.FromBytes("settings", []byte("router:\n  retries: 2\nnotify:\n  webhooks:\n"+
+		"    - url: https://alerts.example.com/a\n      events: [node_lost]\n      secret_file: /etc/llmgw/secrets/hook\n"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	hooks, _ := parseWebhooks([]string{"https://alerts.example.com/a, https://hooks.slack.com/services/T/B/c"})
+	changed, err := withWebhooks(doc, hooks)
+	if err != nil || !changed {
+		t.Fatalf("changed %v: %v", changed, err)
+	}
+	b, _ := doc.Bytes()
+	got := string(b)
+	for _, want := range []string{"retries: 2", "url: https://alerts.example.com/a", "events: [node_lost]",
+		"secret_file: /etc/llmgw/secrets/hook", "url: https://hooks.slack.com/services/T/B/c", "format: slack"} {
+		if !strings.Contains(got, want) {
+			t.Errorf("%q not in:\n%s", want, got)
+		}
+	}
+	if strings.Count(got, "alerts.example.com/a") != 1 {
+		t.Errorf("a webhook already there was added again:\n%s", got)
+	}
+	if changed, _ := withWebhooks(doc, hooks); changed {
+		t.Error("adding the same webhooks again changed the settings")
+	}
+}
+
+func TestSetupPutsItsWebhooksInTheSettingsAndTestsThemOnceInForce(t *testing.T) {
+	var mu sync.Mutex
+	body, tests := "router:\n  retries: 2\n", 0
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		defer mu.Unlock()
+		w.Header().Set("Content-Type", "application/json")
+		switch {
+		case r.Method == http.MethodGet && r.URL.Path == "/api/v1/settings":
+			_ = json.NewEncoder(w).Encode(adminapi.SettingsView{Version: 1, Body: body})
+		case r.Method == http.MethodPut && r.URL.Path == "/api/v1/settings":
+			var req adminapi.SettingsRequest
+			_ = json.NewDecoder(r.Body).Decode(&req)
+			body = req.Body
+			_ = json.NewEncoder(w).Encode(adminapi.SettingsView{Version: 2, Body: body})
+		case r.Method == http.MethodPost && r.URL.Path == "/api/v1/notify/test":
+			tests++
+			// The first answer comes from the control plane before it
+			// started again on the change: it knows no webhooks.
+			res := []notify.Result{}
+			if tests > 1 {
+				res = []notify.Result{{URL: notify.Redact("https://hooks.slack.com/services/T/B/c")},
+					{URL: notify.Redact("https://ops.example.com/in"), Err: "502 Bad Gateway"}}
+			}
+			_ = json.NewEncoder(w).Encode(res)
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	defer srv.Close()
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "server.yaml"),
+		[]byte("admin_listen: "+strings.TrimPrefix(srv.URL, "http://")+"\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	var out bytes.Buffer
+	in := &serverInit{etcDir: dir, out: &out,
+		webhooks: []string{"https://hooks.slack.com/services/T/B/c", "https://ops.example.com/in"}}
+	err := in.ensureWebhooks(t.Context())
+	if err == nil || !strings.Contains(err.Error(), "502") || !strings.Contains(err.Error(), "ctl notify test") {
+		t.Errorf("a webhook that did not answer: %v", err)
+	}
+	mu.Lock()
+	defer mu.Unlock()
+	if !strings.Contains(body, "format: slack") || !strings.Contains(body, "url: https://ops.example.com/in") ||
+		!strings.Contains(body, "retries: 2") || tests < 2 {
+		t.Errorf("settings %q after %d tests", body, tests)
+	}
+	if strings.Contains(out.String(), "/services/T/B/c") {
+		t.Errorf("a webhook's secret path was printed:\n%s", out.String())
+	}
+	if !strings.Contains(out.String(), "reached https://hooks.slack.com/…") {
+		t.Errorf("the one that answered is not said:\n%s", out.String())
+	}
+}

internal/cli/status_test.go

@@ -52,6 +52,8 @@ func TestModelStatusSeparatesWaitingFromBroken(t *testing.T) {
 		{"nothing could be placed", adminapi.ModelView{Min: 1, Ready: 0, Total: 0}, "not placed"},
 		{"deliberately not running", adminapi.ModelView{Min: 0, Ready: 0, Total: 0}, "stopped"},
 		{"short but rebuilding", adminapi.ModelView{Min: 2, Ready: 1, Total: 2}, "starting"},
+		{"woken by a request", adminapi.ModelView{Min: 0, Ready: 1, Total: 1}, "ready (on demand)"},
+		{"waking", adminapi.ModelView{Min: 0, Ready: 0, Total: 1}, "starting"},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			if got := modelStatus(tc.view); got != tc.want {

internal/cli/tui_console.go

@@ -90,7 +90,10 @@ type consoleData struct {
 	// federation is the other llmgw clusters whose models are offered
 	// here; empty on a control plane without a store.
 	federation adminapi.FederationView
-	err        error
+	// presets is the models that come with llmgw as they stand here; nil
+	// from a control plane that cannot say.
+	presets *adminapi.PresetsView
+	err     error
 }
 
 type (
@@ -275,6 +278,10 @@ func (m consoleModel) fetch() tea.Cmd {
 		_ = c.get(ctx, "/api/v1/jobs", &d.jobs)
 		_ = c.get(ctx, "/api/v1/audit?since=7d&limit=300", &d.audit)
 		_ = c.get(ctx, "/api/v1/federation", &d.federation)
+		var presets adminapi.PresetsView
+		if c.get(ctx, "/api/v1/presets", &presets) == nil {
+			d.presets = &presets
+		}
 		return consoleDataMsg(d)
 	}
 }
@@ -599,6 +606,10 @@ func (m consoleModel) key(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.hf.models, m.hf.err, m.row = nil, nil, 0
 			return m, m.fetchHF()
 		}
+	case "p":
+		if m.menu == cModels && m.inPanel && m.data.presets != nil {
+			m.autoPresetsConfirm()
+		}
 	case "a":
 		switch m.menu {
 		case cQuotas:
@@ -1237,9 +1248,13 @@ func (m consoleModel) panel() (title, body, keys string) {
 				strings.Join(md.Profiles, ","), upd, warn})
 		}
 		if m.inPanel {
-			keys = "↑↓ row · Enter actions · A add from a file · ← back · Q leave"
+			keys = "↑↓ row · Enter actions · A add a model · ← back · Q leave"
+			if m.data.presets != nil {
+				keys = "↑↓ row · Enter actions · A add a model · P pictures and 3D added by themselves · ← back · Q leave"
+			}
 		}
-		return "Models", "\n" + table([]string{"MODEL", "READY", "STATUS", "CLASS", "PROFILES", "UPDATE", ""}, rows, m.row, pw, m.inPanel), keys
+		return "Models", "\n" + table([]string{"MODEL", "READY", "STATUS", "CLASS", "PROFILES", "UPDATE", ""}, rows, m.row, pw, m.inPanel) +
+			presetsBlock(m.data.presets, pw), keys
 	case cReplicas:
 		var rows [][]string
 		for _, r := range m.data.replicas {

internal/cli/tui_init.go

@@ -50,6 +50,7 @@ func (w *lineWriter) Write(p []byte) (int, error) {
 const (
 	fAdmin = iota
 	fHosts
+	fWebhooks
 	fPostgres
 	fMirror
 	fNode
@@ -70,6 +71,7 @@ type initModel struct {
 	focus     int
 	admin     textField
 	hosts     textField
+	webhooks  textField
 	bundle    textField
 	bundleSHA textField
 	toggles   [fCount]bool
@@ -103,6 +105,11 @@ func newInitModel(in *serverInit, found []string, askForm bool) initModel {
 	hosts.SetValue(strings.Join(in.hosts, ", "))
 	hosts.CharLimit = 400
 	hosts.Width = 40
+	webhooks := newTextField()
+	webhooks.Placeholder = "https://hooks.slack.com/services/…"
+	webhooks.SetValue(strings.Join(in.webhooks, ", "))
+	webhooks.CharLimit = 800
+	webhooks.Width = 40
 	bundle := newTextField()
 	bundle.Placeholder = "/media/usb/llmgw-bundle.tar"
 	bundle.SetValue(in.bundle)
@@ -114,7 +121,7 @@ func newInitModel(in *serverInit, found []string, askForm bool) initModel {
 	bundleSHA.CharLimit = 64
 	bundleSHA.Width = 64
 	sp := newSpinner()
-	m := initModel{in: in, found: found, form: askForm, admin: admin, hosts: hosts,
+	m := initModel{in: in, found: found, form: askForm, admin: admin, hosts: hosts, webhooks: webhooks,
 		bundle: bundle, bundleSHA: bundleSHA, spin: sp, width: 100}
 	m.toggles[fPostgres] = in.postgres
 	m.toggles[fMirror] = !in.noMirror
@@ -235,6 +242,17 @@ func (m initModel) formKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.moveFocus(0)
 			return m, nil
 		}
+		hooks := strings.TrimSpace(m.webhooks.Value())
+		if _, err := parseWebhooks([]string{hooks}); err != nil {
+			m.formError = err.Error()
+			m.focus = fWebhooks
+			m.moveFocus(0)
+			return m, nil
+		}
+		m.in.webhooks = nil
+		if hooks != "" {
+			m.in.webhooks = []string{hooks}
+		}
 		m.in.bundle, m.in.bundleSHA = bundle, sum
 		m.in.admin = admin
 		m.in.hosts = nil
@@ -260,6 +278,10 @@ func (m initModel) formKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 		var cmd tea.Cmd
 		m.hosts, cmd = m.hosts.Update(k)
 		return m, cmd
+	case fWebhooks:
+		var cmd tea.Cmd
+		m.webhooks, cmd = m.webhooks.Update(k)
+		return m, cmd
 	case fBundle:
 		var cmd tea.Cmd
 		m.bundle, cmd = m.bundle.Update(k)
@@ -284,6 +306,7 @@ func (m *initModel) moveFocus(d int) {
 	}
 	m.admin.Blur()
 	m.hosts.Blur()
+	m.webhooks.Blur()
 	m.bundle.Blur()
 	m.bundleSHA.Blur()
 	switch m.focus {
@@ -291,6 +314,8 @@ func (m *initModel) moveFocus(d int) {
 		m.admin.Focus()
 	case fHosts:
 		m.hosts.Focus()
+	case fWebhooks:
+		m.webhooks.Focus()
 	case fBundle:
 		m.bundle.Focus()
 	case fBundleSHA:
@@ -409,6 +434,8 @@ func (m initModel) formView() string {
 		found = strings.Join(m.found, ", ")
 	}
 	b.WriteString("    " + sDim.Render("Already in the certificate: "+found+". Add a DNS name or NAT address here.") + "\n\n")
+	fmt.Fprintf(&b, "%s\n    %s\n", label(fWebhooks, "Notification webhooks"), m.webhooks.View())
+	b.WriteString("    " + sDim.Render("Where a parked model, a lost node or a spent budget is said: Slack, Mattermost, or any URL taking JSON. Comma-separated; a test is sent.") + "\n\n")
 	b.WriteString(check(fPostgres, "PostgreSQL", "rather than SQLite; installed here, for several control planes or a larger store"))
 	if m.in.mirrorURL != "" {
 		b.WriteString("  Model mirror " + sDim.Render("at "+m.in.mirrorURL+", from --mirror") + "\n")

internal/cli/tui_init_test.go

@@ -20,6 +20,8 @@ func TestTheInitFormBecomesInitsSettings(t *testing.T) {
 	m = typeIn(m, "ops@example.com")
 	m = send(m, tea.KeyMsg{Type: tea.KeyTab})
 	m = typeIn(m, "llm.example.com, 203.0.113.10")
+	m = send(m, tea.KeyMsg{Type: tea.KeyTab})
+	m = typeIn(m, "https://hooks.slack.com/services/T1/B2/x, json:https://alerts.example.com/in")
 	m = send(m, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune(" ")}) // PostgreSQL on
 	m = send(m, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyTab},
 		tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune(" ")}) // starter model off
@@ -33,11 +35,30 @@ func TestTheInitFormBecomesInitsSettings(t *testing.T) {
 	if !in.postgres || in.noMirror || in.noNode || !in.noModel || !in.noGuardModel {
 		t.Errorf("toggles: postgres %v mirror %v node %v model %v", in.postgres, !in.noMirror, !in.noNode, !in.noModel)
 	}
+	if hooks, err := parseWebhooks(in.webhooks); err != nil || len(hooks) != 2 || hooks[0].Format != "slack" || hooks[1].Format != "json" {
+		t.Errorf("webhooks %q: %+v %v", in.webhooks, hooks, err)
+	}
 	if m.(initModel).form {
 		t.Error("the form stayed up after Set up")
 	}
 }
 
+func TestAWebhookThatIsNoAddressKeepsTheFormUp(t *testing.T) {
+	in := &serverInit{}
+	var m tea.Model = newInitModel(in, nil, true)
+	for range fWebhooks {
+		m = send(m, tea.KeyMsg{Type: tea.KeyTab})
+	}
+	m = typeIn(m, "hooks.slack.com/services/x")
+	for range fStart - fWebhooks {
+		m = send(m, tea.KeyMsg{Type: tea.KeyTab})
+	}
+	m = send(m, tea.KeyMsg{Type: tea.KeyEnter})
+	if !m.(initModel).form || m.(initModel).focus != fWebhooks || !strings.Contains(m.View(), "http(s) address") {
+		t.Errorf("an address without its scheme was taken:\n%s", m.View())
+	}
+}
+
 func TestAnOfflineBundleIsGivenInTheFormWithItsDigest(t *testing.T) {
 	in := &serverInit{}
 	var m tea.Model = newInitModel(in, nil, true)
@@ -117,9 +138,10 @@ func TestWithAMirrorElsewhereTheFormDoesNotOfferOne(t *testing.T) {
 	if v := m.View(); !strings.Contains(v, "at http://10.0.0.150:8082, from --mirror") {
 		t.Errorf("the mirror in use is not shown:\n%s", v)
 	}
-	// Tab from the addresses goes past the mirror line to PostgreSQL, then
-	// the node.
-	m = send(m, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyTab})
+	// Tab from the addresses goes to the webhooks, past the mirror line to
+	// PostgreSQL, then the node.
+	m = send(m, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyTab}, tea.KeyMsg{Type: tea.KeyTab},
+		tea.KeyMsg{Type: tea.KeyTab})
 	if f := m.(initModel).focus; f != fNode {
 		t.Errorf("focus %d, want the node toggle %d", f, fNode)
 	}

internal/cli/tui_mirror.go

@@ -12,6 +12,7 @@ import (
 	tea "github.com/charmbracelet/bubbletea"
 
 	"gitea.mynodes.xyz/ilker/llmgw/internal/config"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/catalog"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/mirror"
 )
 
@@ -253,19 +254,42 @@ func (m consoleModel) mirrorPanel(pw int) (string, string, string) {
 	return "Mirror", head + table([]string{"MODEL", "VERSION", "FILE", "STATE", "SIZE", "USED BY"}, rows, m.row, pw, m.inPanel), keys
 }
 
-// addModelForm adds a model from a definition file on this machine: the
-// same YAML a model takes in server.yaml.
+// fromFile is the add-model choice that reads a definition file rather
+// than naming a preset.
+const fromFile = "from a file"
+
+// addModelForm adds a model that comes with llmgw, or one from a definition
+// file on this machine: the same YAML a model takes in server.yaml.
 func (m *consoleModel) addModelForm() {
 	server := "--server=" + m.client.base
+	var note strings.Builder
+	note.WriteString("A model that comes with llmgw, tried and with its licence:\n")
+	for _, p := range catalog.Presets() {
+		fmt.Fprintf(&note, "  %s: %s, %s, %s\n", p.Model.Name, p.Makes, presetCard(p.Model), presetLicence(p.Model))
+	}
+	note.WriteString("A ComfyUI one has the nodes install ComfyUI if the cluster has none.\n" +
+		"Or a definition file: the YAML a model takes in server.yaml's models.")
+	var choices []string
+	for _, n := range catalog.PresetNames() {
+		choices = append(choices, presetChoice(m.data.presets, n))
+	}
 	m.openForm(&formDialog{title: "Add a model",
-		note: "From a definition file on this machine: the YAML a model takes in\nserver.yaml's models. Serve a model, under Do, needs none.",
+		note: note.String(),
 		fields: []formField{
-			textF("file", "", "like /root/qwen.yaml"),
+			choiceF("model", append(choices, fromFile), choices[0]),
+			textF("file", "", "for "+fromFile+": like /root/qwen.yaml"),
 		},
 		submit: func(m *consoleModel, v []string) (tea.Cmd, error) {
-			if _, err := os.Stat(v[0]); err != nil {
+			if v[0] != fromFile {
+				// The name, without what the choice says beside it.
+				return m.addPreset(strings.Fields(v[0])[0]), nil
+			}
+			if v[1] == "" {
+				return nil, fmt.Errorf("a file, or a model that comes with llmgw")
+			}
+			if _, err := os.Stat(v[1]); err != nil {
 				return nil, err
 			}
-			return m.runCLI("Add a model", "ctl", server, "model", "add", "-f", v[0]), nil
+			return m.runCLI("Add a model", "ctl", server, "model", "add", "-f", v[1]), nil
 		}})
 }

internal/cli/tui_presets.go

@@ -0,0 +1,128 @@
+package cli
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+)
+
+// presetsBlock is the models that come with llmgw, under the models table:
+// whether each fits a card here and whether it is in the catalog, and
+// whether the leader adds them by itself. Empty from a control plane that
+// cannot say.
+func presetsBlock(v *adminapi.PresetsView, width int) string {
+	if v == nil || len(v.Presets) == 0 {
+		return ""
+	}
+	var rows [][]string
+	var why []string
+	for _, p := range v.Presets {
+		rows = append(rows, []string{p.Name, p.Makes, orDash(strings.Join(p.FitsClasses, ",")), presetState(p)})
+		// Why the leader leaves it, under the table: a reason is longer than
+		// any column the panel has room for. Automatic adding being off is
+		// said once, below.
+		if p.Blocked != "" && !strings.HasPrefix(p.Blocked, "presets.auto") && !p.Declined {
+			why = append(why, "  "+wrap(p.Name+": "+p.Blocked, width-4, "    "))
+		}
+	}
+	auto := "Added by themselves where a card fits · P stops that"
+	if !v.Auto {
+		auto = "Not added by themselves · P starts that · A adds one"
+	}
+	out := "\n\n  Pictures and 3D models that come with llmgw\n" +
+		table([]string{"PRESET", "MAKES", "FITS", "HERE"}, rows, -1, width, false)
+	if len(why) > 0 {
+		out += "\n" + sDim.Render(strings.Join(why, "\n"))
+	}
+	return out + "\n  " + sDim.Render(auto)
+}
+
+// presetChoice is how a preset is offered in the add dialog: its name, and
+// where it stands when that is worth knowing before choosing it.
+func presetChoice(v *adminapi.PresetsView, name string) string {
+	if v == nil {
+		return name
+	}
+	for _, p := range v.Presets {
+		if p.Name != name {
+			continue
+		}
+		switch {
+		case p.InCatalog:
+			return name + " (already here)"
+		case presetAddsComfyUI(v, p):
+			return name + " (installs ComfyUI too)"
+		case !p.Fits:
+			return name + " (no card here fits it)"
+		case p.Declined:
+			return name + " (removed before)"
+		}
+	}
+	return name
+}
+
+// presetAddsComfyUI is whether adding a preset by hand also sets
+// engines.comfyui, which has the GPU nodes install it and the control planes
+// restart on the setting.
+func presetAddsComfyUI(v *adminapi.PresetsView, p adminapi.PresetView) bool {
+	return v != nil && !p.InCatalog && v.ComfyUI == ""
+}
+
+// addPreset adds a preset through the control plane, or, from one from
+// before it could, the way the release that brought presets did. One whose
+// adding installs ComfyUI and restarts the control planes is asked about
+// first.
+func (m *consoleModel) addPreset(name string) tea.Cmd {
+	if m.data.presets != nil {
+		for _, p := range m.data.presets.Presets {
+			if p.Name == name && presetAddsComfyUI(m.data.presets, p) {
+				m.confirmD = &confirmDialog{title: "Add " + name + " and ComfyUI",
+					text: "The cluster installs no ComfyUI yet. Adding " + name + " sets engines.comfyui:\n" +
+						"every GPU node installs it, about 10 GB each, and the control planes restart\n" +
+						"on the setting, standbys first. Engines keep serving.",
+					yes: func(m *consoleModel) tea.Cmd { return m.postPreset(name) }}
+				return nil
+			}
+		}
+	}
+	return m.postPreset(name)
+}
+
+func (m *consoleModel) postPreset(name string) tea.Cmd {
+	if m.data.presets == nil {
+		return m.runCLI("Add "+name, "ctl", "--server="+m.client.base, "model", "add", name)
+	}
+	return m.call("Add "+name, http.MethodPost, "/api/v1/presets/"+url.PathEscape(name), map[string]string{},
+		func(_ json.RawMessage) string {
+			return name + " is added, and ComfyUI with it where the cluster had none.\n" +
+				"It is placed on the next pass, and loads when first asked for."
+		})
+}
+
+// autoPresetsConfirm turns the adding of presets by themselves on or off,
+// after saying what that does.
+func (m *consoleModel) autoPresetsConfirm() {
+	on := !m.data.presets.Auto
+	title, text := "Stop adding pictures and 3D models by themselves",
+		"Presets already added stay. A preset is added only when somebody adds it."
+	if on {
+		title, text = "Add pictures and 3D models by themselves",
+			"Where a card fits one and the catalog has nothing that makes what it makes, the leader adds it.\n"+
+				"That also has every GPU node install ComfyUI, about 10 GB each, and the mirror fetch its weights.\n"+
+				"A preset somebody removed is not added again."
+	}
+	m.confirmD = &confirmDialog{title: title, text: text, yes: func(m *consoleModel) tea.Cmd {
+		return m.call(title, http.MethodPut, "/api/v1/presets/auto", adminapi.PresetsAutoRequest{On: on},
+			func(_ json.RawMessage) string {
+				if on {
+					return "Presets are added by themselves where a card fits."
+				}
+				return "Presets are no longer added by themselves."
+			})
+	}}
+}

internal/cli/tui_presets_test.go

@@ -0,0 +1,63 @@
+package cli
+
+import (
+	"strings"
+	"testing"
+
+	tea "github.com/charmbracelet/bubbletea"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+)
+
+func presetsHere() *adminapi.PresetsView {
+	return &adminapi.PresetsView{Auto: true, Presets: []adminapi.PresetView{
+		{Name: "flux-schnell", Makes: "pictures", Card: "cc 7.0+, 24 GB+", Fits: true, FitsClasses: []string{"v100-32g"},
+			Blocked: "the cluster installs no ComfyUI (engines.comfyui); adding it by hand sets that"},
+		{Name: "triposr", Makes: "meshes", Card: "cc 7.0+, 8 GB+", Fits: true, InCatalog: true, AddedBy: "auto"},
+	}}
+}
+
+func TestThePresetsAreOnTheModelsScreen(t *testing.T) {
+	m, _ := consoleWith(t, cModels)
+	m.data.presets = presetsHere()
+	v := m.View()
+	for _, want := range []string{"Pictures and 3D models that come with llmgw", "flux-schnell", "v100-32g",
+		"installs no ComfyUI", "added by itself", "P pictures and 3D"} {
+		if !strings.Contains(v, want) {
+			t.Errorf("%q not shown:\n%s", want, v)
+		}
+	}
+	// A control plane that cannot say shows none of it.
+	m.data.presets = nil
+	if v := m.View(); strings.Contains(v, "come with llmgw") || strings.Contains(v, "P pictures") {
+		t.Errorf("presets shown from nothing:\n%s", v)
+	}
+}
+
+func TestAPresetThatInstallsComfyUIIsAddedOnlyWhenConfirmed(t *testing.T) {
+	m, s := consoleWith(t, cModels)
+	m.data.presets = presetsHere()
+	var tm tea.Model = m
+	tm = press(tm, "a")
+	f := tm.(consoleModel).formD
+	if f == nil || !strings.Contains(f.fields[0].value(), "installs ComfyUI too") {
+		t.Fatalf("no add dialog saying what flux-schnell brings: %+v", f)
+	}
+	tm = press(tm, "enter", "enter", "enter")
+	if tm.(consoleModel).confirmD == nil || s.last() != "" {
+		t.Fatalf("added without asking: %q", s.last())
+	}
+	tm = pressRun(tm, "y")
+	if got := s.last(); got != "POST /api/v1/presets/flux-schnell {}" {
+		t.Fatalf("sent %q", got)
+	}
+
+	tm = press(tm, "esc", "p") // past what the add said
+	if c := tm.(consoleModel).confirmD; c == nil || !strings.HasPrefix(c.title, "Stop adding") {
+		t.Fatalf("P did not ask to stop: %+v", c)
+	}
+	_ = pressRun(tm, "y")
+	if got := s.last(); got != `PUT /api/v1/presets/auto {"on":false}` {
+		t.Fatalf("sent %q", got)
+	}
+}

internal/cli/tui_setup.go

@@ -15,6 +15,7 @@ import (
 	"github.com/charmbracelet/lipgloss"
 
 	joinpkg "gitea.mynodes.xyz/ilker/llmgw/internal/join"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/notify"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/onboard"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/pgha"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/preflight"
@@ -150,8 +151,8 @@ type setupModel struct {
 	ips    []string
 	choice int // 0 one machine, 1 high availability
 
-	admin, names textField
-	afocus       int // admin, names, next
+	admin, names, webhooks textField
+	afocus                 int // admin, names, webhooks, next
 
 	db     [2]dbMachine
 	mfocus int // over both machines' fields, then the check button
@@ -184,8 +185,10 @@ func newSetupModel(host string, ips []string) setupModel {
 	admin.Placeholder, admin.CharLimit, admin.Width = "you@example.com", 200, 40
 	names := newTextField()
 	names.Placeholder, names.CharLimit, names.Width = "llm.example.com, 203.0.113.10", 400, 40
+	webhooks := newTextField()
+	webhooks.Placeholder, webhooks.CharLimit, webhooks.Width = "https://hooks.slack.com/services/…", 800, 40
 	return setupModel{
-		ref: &progRef{}, host: host, ips: ips, admin: admin, names: names,
+		ref: &progRef{}, host: host, ips: ips, admin: admin, names: names, webhooks: webhooks,
 		db: [2]dbMachine{newDBMachine(1), newDBMachine(2)}, spin: newSpinner(), width: 100, height: 30,
 		log: &[]string{}, logMu: &sync.Mutex{},
 	}
@@ -308,14 +311,17 @@ func (m setupModel) key(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 
 func (m setupModel) adminKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 	move := func(d int) {
-		m.afocus = (m.afocus + d + 3) % 3
+		m.afocus = (m.afocus + d + 4) % 4
 		m.admin.Blur()
 		m.names.Blur()
+		m.webhooks.Blur()
 		switch m.afocus {
 		case 0:
 			m.admin.Focus()
 		case 1:
 			m.names.Focus()
+		case 2:
+			m.webhooks.Focus()
 		}
 	}
 	switch k.Type {
@@ -326,7 +332,7 @@ func (m setupModel) adminKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 		move(-1)
 		return m, nil
 	case tea.KeyEnter:
-		if m.afocus < 2 {
+		if m.afocus < 3 {
 			move(1)
 			return m, nil
 		}
@@ -336,6 +342,12 @@ func (m setupModel) adminKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 			move(0)
 			return m, nil
 		}
+		if _, err := parseWebhooks(m.webhookList()); err != nil {
+			m.formErr = err.Error()
+			m.afocus = 2
+			move(0)
+			return m, nil
+		}
 		m.formErr = ""
 		m.page, m.mfocus = pMachines, 0
 		m.db[0].addr.Focus()
@@ -347,10 +359,23 @@ func (m setupModel) adminKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 		m.admin, cmd = m.admin.Update(k)
 	case 1:
 		m.names, cmd = m.names.Update(k)
+	case 2:
+		m.webhooks, cmd = m.webhooks.Update(k)
 	}
 	return m, cmd
 }
 
+// webhookList is the webhooks asked for, one an item.
+func (m setupModel) webhookList() []string {
+	var out []string
+	for _, s := range strings.Split(m.webhooks.Value(), ",") {
+		if s = strings.TrimSpace(s); s != "" {
+			out = append(out, s)
+		}
+	}
+	return out
+}
+
 func (m *setupModel) focusMachine() {
 	for i := range m.db {
 		for f := 0; f < mfCount; f++ {
@@ -589,6 +614,9 @@ func (m setupModel) command() string {
 	for _, t := range m.targets() {
 		parts = append(parts, "--patroni "+t)
 	}
+	for _, w := range m.webhookList() {
+		parts = append(parts, "--webhook "+w)
+	}
 	parts = append(parts, "--no-node", "--no-model")
 	return strings.Join(parts, " \\\n    ")
 }
@@ -600,6 +628,7 @@ func (m *setupModel) startRun() tea.Cmd {
 	in.admin = strings.TrimSpace(m.admin.Value())
 	in.hosts = m.namesList()
 	in.patroni = m.targets()
+	in.webhooks = m.webhookList()
 	// The control plane of a replicated setup is not where models run;
 	// nodes are added once it is up.
 	in.noNode, in.noModel = true, true
@@ -759,7 +788,9 @@ func (m setupModel) adminView() string {
 		sDim.Render("A password is generated and shown once, at the end."))
 	fmt.Fprintf(&b, "%s\n    %s\n    %s\n\n", label(1, "Other names nodes will reach this machine by"), m.names.View(),
 		sDim.Render("Known: "+strings.Join(append([]string{m.host}, m.ips...), ", ")+". Add a DNS name or a floating address."))
-	b.WriteString(button(m.afocus == 2, "Next") + "\n")
+	fmt.Fprintf(&b, "%s\n    %s\n    %s\n\n", label(2, "Notification webhooks"), m.webhooks.View(),
+		sDim.Render("Where a parked model, a lost node or a spent budget is said: Slack, Mattermost, or any URL taking JSON. Optional; a test is sent."))
+	b.WriteString(button(m.afocus == 3, "Next") + "\n")
 	return b.String()
 }
 
@@ -880,6 +911,13 @@ func (m setupModel) planView() string {
 	fmt.Fprintf(&b, "  %s  %s\n      %s\n", lipgloss.NewStyle().Bold(true).Render(m.host), sDim.Render(m.thisAddr()),
 		"control plane and gateway, model mirror, etcd (the third vote)")
 	fmt.Fprintf(&b, "      administrator %s\n", strings.TrimSpace(m.admin.Value()))
+	if hooks, _ := parseWebhooks(m.webhookList()); len(hooks) > 0 {
+		var where []string
+		for _, h := range hooks {
+			where = append(where, notify.Redact(h.URL)+" ("+h.Format+")")
+		}
+		fmt.Fprintf(&b, "      alerts to %s\n", strings.Join(where, ", "))
+	}
 	granted := false
 	for _, d := range m.db {
 		addr := strings.TrimSpace(d.addr.Value())

internal/cli/tui_setup_test.go

@@ -45,7 +45,7 @@ func TestTheSetupAsksForWhatHighAvailabilityNeedsAndRefusesWhatWillNotDo(t *test
 		t.Fatalf("high availability did not lead to the administrator: page %d", s.page)
 	}
 	// No email: refused, with a reason.
-	m = press(m, "tab", "tab", "enter")
+	m = press(m, "tab", "tab", "tab", "enter")
 	if s := m.(setupModel); s.page != pAdmin || !strings.Contains(s.formErr, "email") {
 		t.Fatalf("went on without an administrator: %+v", s.formErr)
 	}
@@ -54,7 +54,7 @@ func TestTheSetupAsksForWhatHighAvailabilityNeedsAndRefusesWhatWillNotDo(t *test
 	if !strings.Contains(m.View(), "Not yet") {
 		t.Error("the refusal was not shown as a dialog")
 	}
-	m = press(m, "x", "a@example.com", "tab", "tab", "enter")
+	m = press(m, "x", "a@example.com", "tab", "tab", "tab", "enter")
 	s := m.(setupModel)
 	if s.page != pMachines {
 		t.Fatalf("page %d: %s", s.page, s.formErr)

internal/clientapi/clientapi.go

@@ -0,0 +1,526 @@
+// Package clientapi describes the API clients use, the one on :8080 — OpenAI's
+// shape and what llmgw adds to it — for its OpenAPI document.
+//
+// The types here are the bodies as they go over the wire, written for the
+// document: the handlers read a request's routing fields and pass the rest
+// to the engine as it came, so a request may carry more than is listed, and
+// an engine's answer may say more than is listed. The route table is checked
+// against the router's own by a test, so an endpoint cannot be added without
+// being described.
+package clientapi
+
+import "encoding/json"
+
+// Error is every refusal: OpenAI's shape.
+type Error struct {
+	Error ErrorBody `json:"error"`
+}
+
+// ErrorBody says why.
+type ErrorBody struct {
+	Message string `json:"message"`
+	// Type is invalid_request_error, server_error, rate_limit_exceeded …
+	Type string `json:"type"`
+	// Code, where there is one a client branches on: model_not_found,
+	// content_policy_violation, job_not_found, system_stopped.
+	Code *string `json:"code"`
+}
+
+// ChatMessage is one turn.
+type ChatMessage struct {
+	// Role is system, user, assistant or tool.
+	Role string `json:"role"`
+	// Content is a string, or a list of parts: text, and image_url for a
+	// model with vision.
+	Content    json.RawMessage `json:"content"`
+	Name       string          `json:"name,omitempty"`
+	ToolCalls  json.RawMessage `json:"tool_calls,omitempty"`
+	ToolCallID string          `json:"tool_call_id,omitempty"`
+}
+
+// StreamOptions asks for usage in the last chunk of a stream.
+type StreamOptions struct {
+	IncludeUsage bool `json:"include_usage"`
+}
+
+// ChatCompletionRequest is a chat turn asked of a model.
+type ChatCompletionRequest struct {
+	// Model is a model's name or alias, or an adapter's name.
+	Model    string        `json:"model"`
+	Messages []ChatMessage `json:"messages"`
+	// Stream answers as server-sent events.
+	Stream              bool           `json:"stream,omitempty"`
+	StreamOptions       *StreamOptions `json:"stream_options,omitempty"`
+	MaxTokens           int            `json:"max_tokens,omitempty"`
+	MaxCompletionTokens int            `json:"max_completion_tokens,omitempty"`
+	Temperature         *float64       `json:"temperature,omitempty"`
+	TopP                *float64       `json:"top_p,omitempty"`
+	Seed                *int64         `json:"seed,omitempty"`
+	// Stop is a string or a list of them.
+	Stop           json.RawMessage `json:"stop,omitempty"`
+	Tools          json.RawMessage `json:"tools,omitempty"`
+	ToolChoice     json.RawMessage `json:"tool_choice,omitempty"`
+	ResponseFormat json.RawMessage `json:"response_format,omitempty"`
+	// User is the client's own name for whoever it serves, kept with the
+	// usage.
+	User string `json:"user,omitempty"`
+	// Metadata are tags kept with the usage, never sent to the engine.
+	Metadata map[string]string `json:"metadata,omitempty"`
+}
+
+// Usage is what a request used.
+type Usage struct {
+	PromptTokens     int `json:"prompt_tokens"`
+	CompletionTokens int `json:"completion_tokens"`
+	TotalTokens      int `json:"total_tokens"`
+}
+
+// ChatChoice is one answer.
+type ChatChoice struct {
+	Index   int         `json:"index"`
+	Message ChatMessage `json:"message"`
+	// FinishReason is stop, length or tool_calls.
+	FinishReason string `json:"finish_reason"`
+}
+
+// ChatCompletion is a model's answer.
+type ChatCompletion struct {
+	ID      string       `json:"id"`
+	Object  string       `json:"object"`
+	Created int64        `json:"created"`
+	Model   string       `json:"model"`
+	Choices []ChatChoice `json:"choices"`
+	Usage   Usage        `json:"usage"`
+}
+
+// CompletionRequest is a prompt to continue.
+type CompletionRequest struct {
+	Model string `json:"model"`
+	// Prompt is a string or a list of them.
+	Prompt      json.RawMessage `json:"prompt"`
+	MaxTokens   int             `json:"max_tokens,omitempty"`
+	Temperature *float64        `json:"temperature,omitempty"`
+	Stream      bool            `json:"stream,omitempty"`
+	Stop        json.RawMessage `json:"stop,omitempty"`
+	Seed        *int64          `json:"seed,omitempty"`
+}
+
+// CompletionChoice is one continuation.
+type CompletionChoice struct {
+	Index        int    `json:"index"`
+	Text         string `json:"text"`
+	FinishReason string `json:"finish_reason"`
+}
+
+// Completion is a continued prompt.
+type Completion struct {
+	ID      string             `json:"id"`
+	Object  string             `json:"object"`
+	Created int64              `json:"created"`
+	Model   string             `json:"model"`
+	Choices []CompletionChoice `json:"choices"`
+	Usage   Usage              `json:"usage"`
+}
+
+// EmbeddingRequest asks for vectors.
+type EmbeddingRequest struct {
+	Model string `json:"model"`
+	// Input is a string or a list of them; each is embedded on its own, and
+	// the longest must fit the model's context.
+	Input          json.RawMessage `json:"input"`
+	EncodingFormat string          `json:"encoding_format,omitempty"`
+	Dimensions     int             `json:"dimensions,omitempty"`
+}
+
+// Embedding is one input's vector.
+type Embedding struct {
+	Object    string    `json:"object"`
+	Index     int       `json:"index"`
+	Embedding []float64 `json:"embedding"`
+}
+
+// EmbeddingList is every input's vector.
+type EmbeddingList struct {
+	Object string      `json:"object"`
+	Data   []Embedding `json:"data"`
+	Model  string      `json:"model"`
+	Usage  Usage       `json:"usage"`
+}
+
+// RerankRequest orders documents by a query, for a reranker vLLM serves.
+type RerankRequest struct {
+	Model     string   `json:"model"`
+	Query     string   `json:"query"`
+	Documents []string `json:"documents"`
+	TopN      int      `json:"top_n,omitempty"`
+}
+
+// ScoreRequest scores pairs of texts, for a scorer vLLM serves.
+type ScoreRequest struct {
+	Model string `json:"model"`
+	// TextA and TextB are strings or lists of them.
+	TextA json.RawMessage `json:"text_1"`
+	TextB json.RawMessage `json:"text_2"`
+}
+
+// TranscriptionForm is speech to text, sent as a form.
+type TranscriptionForm struct {
+	// File is the audio.
+	File           []byte  `json:"file"`
+	Model          string  `json:"model"`
+	Language       string  `json:"language,omitempty"`
+	Prompt         string  `json:"prompt,omitempty"`
+	ResponseFormat string  `json:"response_format,omitempty"`
+	Temperature    float64 `json:"temperature,omitempty"`
+}
+
+// Transcription is the text.
+type Transcription struct {
+	Text string `json:"text"`
+}
+
+// ImageRequest asks for pictures, of a model that makes them.
+type ImageRequest struct {
+	Model  string `json:"model"`
+	Prompt string `json:"prompt"`
+	// N is how many, at most 4.
+	N int `json:"n,omitempty"`
+	// Size is WIDTHxHEIGHT, each a multiple of 16 from 256 to 2048.
+	Size string `json:"size,omitempty"`
+	// ResponseFormat is b64_json, the only one offered.
+	ResponseFormat string   `json:"response_format,omitempty"`
+	Seed           *int64   `json:"seed,omitempty"`
+	Steps          int      `json:"steps,omitempty"`
+	NegativePrompt string   `json:"negative_prompt,omitempty"`
+	Guidance       *float64 `json:"guidance,omitempty"`
+}
+
+// Image is one picture.
+type Image struct {
+	B64JSON string `json:"b64_json"`
+}
+
+// ImagesResponse is the pictures made; x-llmgw-seed says the seed.
+type ImagesResponse struct {
+	Created int64   `json:"created"`
+	Data    []Image `json:"data"`
+}
+
+// ModerationRequest asks the guardrails' judge.
+type ModerationRequest struct {
+	// Input is a string or up to 32 of them.
+	Input json.RawMessage `json:"input"`
+	Model string          `json:"model,omitempty"`
+}
+
+// ModerationResult is one input's verdict.
+type ModerationResult struct {
+	Flagged        bool               `json:"flagged"`
+	Categories     map[string]bool    `json:"categories"`
+	CategoryScores map[string]float64 `json:"category_scores"`
+}
+
+// ModerationResponse is every input's verdict.
+type ModerationResponse struct {
+	ID      string             `json:"id"`
+	Model   string             `json:"model"`
+	Results []ModerationResult `json:"results"`
+}
+
+// ResponsesRequest is OpenAI's Responses API, translated to chat completions.
+type ResponsesRequest struct {
+	Model string `json:"model"`
+	// Input is a string or a list of items: messages, function calls and
+	// their outputs.
+	Input        json.RawMessage `json:"input"`
+	Instructions string          `json:"instructions,omitempty"`
+	Stream       bool            `json:"stream,omitempty"`
+	Tools        json.RawMessage `json:"tools,omitempty"`
+	// Text carries format: a JSON schema the answer follows.
+	Text            json.RawMessage `json:"text,omitempty"`
+	MaxOutputTokens int             `json:"max_output_tokens,omitempty"`
+}
+
+// MessagesRequest is Anthropic's Messages API, translated to chat completions.
+type MessagesRequest struct {
+	Model     string          `json:"model"`
+	Messages  json.RawMessage `json:"messages"`
+	System    json.RawMessage `json:"system,omitempty"`
+	MaxTokens int             `json:"max_tokens"`
+	Stream    bool            `json:"stream,omitempty"`
+	Tools     json.RawMessage `json:"tools,omitempty"`
+}
+
+// TokenCount is how many tokens a Messages request would be.
+type TokenCount struct {
+	InputTokens int `json:"input_tokens"`
+}
+
+// License is the terms what a model makes comes under.
+type License struct {
+	// ID is SPDX where there is one, else the licence's own short name.
+	ID     string `json:"id,omitempty"`
+	Name   string `json:"name"`
+	URL    string `json:"url,omitempty"`
+	Notice string `json:"notice,omitempty"`
+	// Commercial is whether the output may be used commercially; absent is
+	// not said.
+	Commercial *bool `json:"commercial,omitempty"`
+	// ExcludedRegions are ISO 3166 codes, EU for the union, where it grants
+	// nothing.
+	ExcludedRegions []string `json:"excluded_regions,omitempty"`
+	RevenueCapUSD   int64    `json:"revenue_cap_usd,omitempty"`
+	Attribution     string   `json:"attribution,omitempty"`
+}
+
+// WorkflowInfo is what a ComfyUI model takes and makes, for a run at
+// /v1/workflows/runs.
+type WorkflowInfo struct {
+	// Output is pictures, meshes, video, audio or files.
+	Output string          `json:"output"`
+	Inputs []WorkflowInput `json:"inputs"`
+}
+
+// WorkflowInput is one input a workflow takes.
+type WorkflowInput struct {
+	Name string `json:"name"`
+	// Type is text, int, float, bool, choice, image, mask, audio, video or
+	// file; the last five are sent as base64, a data URL, or a file's id.
+	Type     string   `json:"type"`
+	Required bool     `json:"required,omitempty"`
+	Default  any      `json:"default,omitempty"`
+	Min      *float64 `json:"min,omitempty"`
+	Max      *float64 `json:"max,omitempty"`
+	Choices  []string `json:"choices,omitempty"`
+	MaxMB    int      `json:"max_mb,omitempty"`
+	Doc      string   `json:"doc,omitempty"`
+}
+
+// RunRequest asks a ComfyUI model to run its workflow.
+type RunRequest struct {
+	Model string `json:"model"`
+	// Inputs are by name, as the model's workflow lists them in /v1/models.
+	Inputs map[string]any `json:"inputs"`
+	// Seed is the workflow's {{seed}}, where it has one; random otherwise.
+	Seed *int64 `json:"seed,omitempty"`
+}
+
+// ModelInfo is a model a key may use.
+type ModelInfo struct {
+	ID      string `json:"id"`
+	Object  string `json:"object"`
+	Created int64  `json:"created"`
+	OwnedBy string `json:"owned_by"`
+	// Loaded is whether a replica is up now; a model that loads when asked
+	// is listed asleep too, and its first request waits for it to load.
+	Loaded bool `json:"loaded"`
+	// ContextLength and MaxOutputTokens, where the catalog says.
+	ContextLength   int    `json:"context_length,omitempty"`
+	MaxOutputTokens int    `json:"max_output_tokens,omitempty"`
+	Description     string `json:"description,omitempty"`
+	// Capabilities: tools, vision, embeddings, images, meshes, workflows.
+	Capabilities map[string]bool `json:"capabilities"`
+	License      *License        `json:"license,omitempty"`
+	// Workflow is what a ComfyUI model takes and makes.
+	Workflow *WorkflowInfo `json:"workflow,omitempty"`
+}
+
+// ModelList is the models a key may use.
+type ModelList struct {
+	Object string      `json:"object"`
+	Data   []ModelInfo `json:"data"`
+}
+
+// FileForm is a file uploaded, as a form.
+type FileForm struct {
+	File []byte `json:"file"`
+	// Purpose is batch for a batch's input.
+	Purpose string `json:"purpose"`
+}
+
+// File is a file kept: a batch's input or output, a job's result.
+type File struct {
+	ID        string `json:"id"`
+	Object    string `json:"object"`
+	Bytes     int64  `json:"bytes"`
+	CreatedAt int64  `json:"created_at"`
+	Filename  string `json:"filename"`
+	// Purpose is batch, batch_output or job_output.
+	Purpose   string `json:"purpose"`
+	Status    string `json:"status"`
+	ExpiresAt int64  `json:"expires_at,omitempty"`
+}
+
+// FileList is the caller's files.
+type FileList struct {
+	Object string `json:"object"`
+	Data   []File `json:"data"`
+}
+
+// Deleted says a thing is gone.
+type Deleted struct {
+	ID      string `json:"id"`
+	Object  string `json:"object"`
+	Deleted bool   `json:"deleted"`
+}
+
+// BatchRequest runs a file of requests, at the lowest priority.
+type BatchRequest struct {
+	InputFileID string `json:"input_file_id"`
+	// Endpoint is /v1/chat/completions, /v1/completions or /v1/embeddings.
+	Endpoint string `json:"endpoint"`
+	// CompletionWindow is 24h.
+	CompletionWindow string            `json:"completion_window"`
+	Metadata         map[string]string `json:"metadata,omitempty"`
+}
+
+// RequestCounts is how a batch's lines went.
+type RequestCounts struct {
+	Total     int `json:"total"`
+	Completed int `json:"completed"`
+	Failed    int `json:"failed"`
+}
+
+// Batch is a batch and how far it is.
+type Batch struct {
+	ID               string          `json:"id"`
+	Object           string          `json:"object"`
+	Endpoint         string          `json:"endpoint"`
+	InputFileID      string          `json:"input_file_id"`
+	CompletionWindow string          `json:"completion_window"`
+	Status           string          `json:"status"`
+	OutputFileID     *string         `json:"output_file_id"`
+	ErrorFileID      *string         `json:"error_file_id"`
+	CreatedAt        int64           `json:"created_at"`
+	InProgressAt     *int64          `json:"in_progress_at"`
+	ExpiresAt        *int64          `json:"expires_at"`
+	FinalizingAt     *int64          `json:"finalizing_at"`
+	CompletedAt      *int64          `json:"completed_at"`
+	FailedAt         *int64          `json:"failed_at"`
+	ExpiredAt        *int64          `json:"expired_at"`
+	CancellingAt     *int64          `json:"cancelling_at"`
+	CancelledAt      *int64          `json:"cancelled_at"`
+	RequestCounts    RequestCounts   `json:"request_counts"`
+	Errors           json.RawMessage `json:"errors"`
+	Metadata         json.RawMessage `json:"metadata"`
+}
+
+// BatchList is the caller's batches.
+type BatchList struct {
+	Object  string  `json:"object"`
+	Data    []Batch `json:"data"`
+	HasMore bool    `json:"has_more"`
+}
+
+// MeshRequest asks for a 3D model from a picture, of a model that makes
+// them: a job.
+type MeshRequest struct {
+	Model string `json:"model"`
+	// Image is the picture, base64 or a data URL: PNG, JPEG or WebP, one
+	// object on a plain background.
+	Image string `json:"image"`
+	Seed  *int64 `json:"seed,omitempty"`
+	Steps int    `json:"steps,omitempty"`
+	// Resolution is the model's grid, a multiple of 32 from 64 to 2048.
+	Resolution int `json:"resolution,omitempty"`
+}
+
+// JobProgress is how far along a job is.
+type JobProgress struct {
+	// State is queued, running, done or failed.
+	State string `json:"state"`
+	// Ahead is how many wait before it, while queued.
+	Ahead     int    `json:"ahead,omitempty"`
+	NodeClass string `json:"node_class,omitempty"`
+	Step      int    `json:"step,omitempty"`
+	Steps     int    `json:"steps,omitempty"`
+	Percent   int    `json:"percent,omitempty"`
+}
+
+// JobUsage is what a finished job used.
+type JobUsage struct {
+	PromptTokens     int64 `json:"prompt_tokens"`
+	CompletionTokens int64 `json:"completion_tokens"`
+	Images           int64 `json:"images"`
+	Meshes           int64 `json:"meshes"`
+}
+
+// Job is a 3D model asked for: its status, progress and, when done, the
+// file its result is in.
+type Job struct {
+	ID       string `json:"id"`
+	Object   string `json:"object"`
+	Endpoint string `json:"endpoint"`
+	Model    string `json:"model"`
+	// Status is queued, running, cancelling, completed, failed, cancelled
+	// or expired.
+	Status       string       `json:"status"`
+	Progress     *JobProgress `json:"progress"`
+	OutputFileID *string      `json:"output_file_id"`
+	ContentType  *string      `json:"content_type"`
+	Error        *ErrorBody   `json:"error"`
+	CreatedAt    int64        `json:"created_at"`
+	StartedAt    *int64       `json:"started_at"`
+	FinishedAt   *int64       `json:"finished_at"`
+	ExpiresAt    *int64       `json:"expires_at"`
+	Usage        *JobUsage    `json:"usage"`
+	License      *License     `json:"license,omitempty"`
+}
+
+// JobList is the caller's jobs.
+type JobList struct {
+	Object  string  `json:"object"`
+	Data    []Job   `json:"data"`
+	HasMore bool    `json:"has_more"`
+	FirstID *string `json:"first_id"`
+	LastID  *string `json:"last_id"`
+}
+
+// MemoryWrite is a note kept for the caller's project.
+type MemoryWrite struct {
+	Text string   `json:"text"`
+	Tags []string `json:"tags,omitempty"`
+}
+
+// MemoryNote is a note kept.
+type MemoryNote struct {
+	Key       string   `json:"key"`
+	Text      string   `json:"text"`
+	Tags      []string `json:"tags"`
+	CreatedAt string   `json:"created_at"`
+	UpdatedAt string   `json:"updated_at"`
+}
+
+// MemoryList is the project's notes.
+type MemoryList struct {
+	Object string       `json:"object"`
+	Data   []MemoryNote `json:"data"`
+}
+
+// Me is the caller as the gateway sees it: its key, place and limits.
+type Me struct {
+	Authenticated bool   `json:"authenticated"`
+	KeyID         string `json:"key_id,omitempty"`
+	Key           string `json:"key,omitempty"`
+	Project       string `json:"project,omitempty"`
+	Team          string `json:"team,omitempty"`
+	Organization  string `json:"organization,omitempty"`
+	// Limits and Usage are what applies and what has been used of it.
+	Limits json.RawMessage `json:"limits,omitempty"`
+	Usage  json.RawMessage `json:"usage,omitempty"`
+}
+
+// MCPRequest is a JSON-RPC 2.0 call to the gateway's MCP server: its tools
+// are the memory notes.
+type MCPRequest struct {
+	JSONRPC string          `json:"jsonrpc"`
+	ID      json.RawMessage `json:"id"`
+	Method  string          `json:"method"`
+	Params  json.RawMessage `json:"params,omitempty"`
+}
+
+// KBDeleted says a document left a collection.
+type KBDeleted struct {
+	Name    string `json:"name"`
+	Deleted bool   `json:"deleted"`
+}

internal/clientapi/routes.go

@@ -0,0 +1,123 @@
+package clientapi
+
+import (
+	"encoding/json"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/router"
+)
+
+type (
+	// Route and Param are the admin API's, which one generator reads.
+	Route = adminapi.Route
+	Param = adminapi.Param
+)
+
+// PathParams describes the parameters in Routes' paths.
+var PathParams = map[string]string{
+	"files/{id}":       "The file's ID, file-….",
+	"batches/{id}":     "The batch's ID, batch_….",
+	"generations/{id}": "The job's ID, job_….",
+	"runs/{id}":        "The job's ID, job_….",
+	"threads/{id}":     "The conversation's ID, as sent in x-llmgw-thread.",
+	"memory/{key}":     "The note's key, chosen by the caller.",
+	"collections/{id}": "The collection's ID, its name when that is unique, or ORG/NAME.",
+}
+
+// any is a body whose shape is the engine's or the provider's own.
+var anyJSON = json.RawMessage{}
+
+// Routes is every endpoint the client API serves, but /health, /ready and
+// /leader, which are a load balancer's and need no key.
+var Routes = []Route{
+	{Method: "POST", Path: "/v1/chat/completions", Summary: "A chat turn",
+		Description: "A model's name, an alias, or an adapter's name. Fields not listed go to the engine as sent. " +
+			"With a knowledge base, x-llmgw-knowledge names the collections to answer from; x-llmgw-thread continues a stored conversation.",
+		Request: ChatCompletionRequest{}, Response: ChatCompletion{}, Stream: true},
+	{Method: "POST", Path: "/v1/completions", Summary: "A prompt continued",
+		Request: CompletionRequest{}, Response: Completion{}, Stream: true},
+	{Method: "POST", Path: "/v1/embeddings", Summary: "Vectors for texts",
+		Request: EmbeddingRequest{}, Response: EmbeddingList{}},
+	{Method: "POST", Path: "/v1/rerank", Summary: "Documents ordered by a query, for a reranker vLLM serves",
+		Request: RerankRequest{}, Response: anyJSON},
+	{Method: "POST", Path: "/v1/score", Summary: "Pairs of texts scored, for a scorer vLLM serves",
+		Request: ScoreRequest{}, Response: anyJSON},
+	{Method: "POST", Path: "/v1/audio/transcriptions", Summary: "Speech to text",
+		Request: TranscriptionForm{}, Form: true, Response: Transcription{}},
+	{Method: "POST", Path: "/v1/audio/translations", Summary: "Speech to English text",
+		Request: TranscriptionForm{}, Form: true, Response: Transcription{}},
+	{Method: "POST", Path: "/v1/images/generations", Summary: "Pictures, of a model that makes them",
+		Description: "Made by ComfyUI. Pictures come back as b64_json and are kept nowhere; x-llmgw-seed says the seed.",
+		Request:     ImageRequest{}, Response: ImagesResponse{}},
+	{Method: "POST", Path: "/v1/3d/generations", Summary: "A 3D model from a picture, as a job",
+		Description: "Answered 202 with the job; ask after it until it is completed, then download output_file_id from /v1/files.",
+		Request:     MeshRequest{}, Response: Job{}, Status: 202},
+	{Method: "GET", Path: "/v1/3d/generations", Summary: "The caller's 3D jobs, newest first",
+		Query: []Param{
+			{Name: "limit", Type: "integer", Description: "The most jobs to answer with, at most 100; 20 when absent."},
+			{Name: "after", Description: "A job's ID: those asked for before it."},
+		},
+		Response: JobList{}},
+	{Method: "GET", Path: "/v1/3d/generations/{id}", Summary: "A 3D job: its status, progress and result", Response: Job{}},
+	{Method: "POST", Path: "/v1/3d/generations/{id}/cancel", Summary: "Stop a 3D job, in the engine's queue too", Response: Job{}},
+	{Method: "POST", Path: "/v1/workflows/runs", Summary: "Run a ComfyUI model's workflow, as a job",
+		Description: "Inputs are those the model's workflow lists in /v1/models. Answered 202 with the job; " +
+			"download output_file_id from /v1/files once it is completed.",
+		Request: RunRequest{}, Response: Job{}, Status: 202},
+	{Method: "GET", Path: "/v1/workflows/runs", Summary: "The caller's jobs, newest first",
+		Query: []Param{
+			{Name: "limit", Type: "integer", Description: "The most jobs to answer with, at most 100; 20 when absent."},
+			{Name: "after", Description: "A job's ID: those asked for before it."},
+		},
+		Response: JobList{}},
+	{Method: "GET", Path: "/v1/workflows/runs/{id}", Summary: "A run: its status, progress and result", Response: Job{}},
+	{Method: "POST", Path: "/v1/workflows/runs/{id}/cancel", Summary: "Stop a run, in the engine's queue too", Response: Job{}},
+	{Method: "POST", Path: "/v1/moderations", Summary: "Texts judged by the guardrails' judge model",
+		Request: ModerationRequest{}, Response: ModerationResponse{}},
+	{Method: "POST", Path: "/v1/responses", Summary: "OpenAI's Responses API, for Codex and the like",
+		Request: ResponsesRequest{}, Response: anyJSON, Stream: true},
+	{Method: "POST", Path: "/v1/messages", Summary: "Anthropic's Messages API, for Claude Code and Anthropic's SDKs",
+		Description: "The key is sent as x-api-key or as a bearer token.",
+		Request:     MessagesRequest{}, Response: anyJSON, Stream: true},
+	{Method: "POST", Path: "/v1/messages/count_tokens", Summary: "How many tokens a Messages request would be",
+		Request: MessagesRequest{}, Response: TokenCount{}},
+	{Method: "GET", Path: "/v1/models", Summary: "The models the key may use", Response: ModelList{}},
+	{Method: "POST", Path: "/v1/files", Summary: "Upload a file: a batch's input",
+		Request: FileForm{}, Form: true, Response: File{}},
+	{Method: "GET", Path: "/v1/files", Summary: "The caller's files",
+		Query:    []Param{{Name: "purpose", Description: "Only files of this purpose: batch, batch_output, job_output."}},
+		Response: FileList{}},
+	{Method: "GET", Path: "/v1/files/{id}", Summary: "A file", Response: File{}},
+	{Method: "GET", Path: "/v1/files/{id}/content", Summary: "A file's content",
+		Binary: "application/octet-stream"},
+	{Method: "DELETE", Path: "/v1/files/{id}", Summary: "Delete a file", Response: Deleted{}},
+	{Method: "POST", Path: "/v1/batches", Summary: "Run a file of requests at the lowest priority",
+		Request: BatchRequest{}, Response: Batch{}},
+	{Method: "GET", Path: "/v1/batches", Summary: "The caller's batches",
+		Query: []Param{
+			{Name: "limit", Type: "integer", Description: "The most batches to answer with; 20 when absent."},
+			{Name: "after", Description: "A batch's ID: those made before it."},
+		},
+		Response: BatchList{}},
+	{Method: "GET", Path: "/v1/batches/{id}", Summary: "A batch and how far it is", Response: Batch{}},
+	{Method: "POST", Path: "/v1/batches/{id}/cancel", Summary: "Stop a batch", Response: Batch{}},
+	{Method: "DELETE", Path: "/v1/threads/{id}", Summary: "Forget a stored conversation"},
+	{Method: "PUT", Path: "/v1/memory/{key}", Summary: "Keep a note for the project",
+		Request: MemoryWrite{}, Response: MemoryNote{}},
+	{Method: "GET", Path: "/v1/memory/{key}", Summary: "A note", Response: MemoryNote{}},
+	{Method: "GET", Path: "/v1/memory", Summary: "The project's notes", Response: MemoryList{}},
+	{Method: "DELETE", Path: "/v1/memory/{key}", Summary: "Forget a note"},
+	{Method: "POST", Path: "/mcp", Summary: "The gateway's MCP server: the memory notes, and pictures, 3D models, vision and workflows, as tools",
+		Request: MCPRequest{}, Response: anyJSON},
+	{Method: "GET", Path: "/me", Summary: "The caller: its key, its place in the tree, its limits and what it has used",
+		Response: Me{}},
+	{Method: "GET", Path: "/v1/kb/collections", Summary: "The knowledge-base collections the caller may read",
+		Response: []router.KBCollectionView{}},
+	{Method: "GET", Path: "/v1/kb/collections/{id}/manifest", Summary: "A collection and its documents",
+		Response: router.KBManifest{}},
+	{Method: "PUT", Path: "/v1/kb/collections/{id}/documents", Summary: "Add or replace a document, read and embedded by the client",
+		Request: router.KBPutDocument{}, Response: router.KBPutResult{}},
+	{Method: "DELETE", Path: "/v1/kb/collections/{id}/documents", Summary: "Take a document out of a collection",
+		Query:    []Param{{Name: "name", Required: true, Description: "The document's name, as the manifest lists it."}},
+		Response: KBDeleted{}},
+}

internal/clientapi/routes_test.go

@@ -0,0 +1,77 @@
+package clientapi
+
+import (
+	"os"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"slices"
+	"strings"
+	"testing"
+)
+
+// routerRoutes are the client API's routes as the router mounts them, read
+// from its source: every mux.HandleFunc under /v1, /mcp and /me, with the
+// path constants it builds some of them from put back.
+func routerRoutes(t *testing.T) []string {
+	t.Helper()
+	_, file, _, _ := runtime.Caller(0)
+	dir := filepath.Join(filepath.Dir(file), "..", "router")
+	consts := map[string]string{"imagesPath": "/v1/images/generations", "meshesPath": "/v1/3d/generations",
+		"workflowsPath": "/v1/workflows/runs"}
+	literal := regexp.MustCompile(`mux\.HandleFunc\("([A-Z]+) (/[^"]*)"`)
+	built := regexp.MustCompile(`mux\.HandleFunc\("([A-Z]+) "\+([A-Za-z]+Path)(\+"([^"]*)")?`)
+	files, _ := filepath.Glob(filepath.Join(dir, "*.go"))
+	var out []string
+	add := func(method, path string) {
+		if strings.HasPrefix(path, "/v1/") || path == "/mcp" || path == "/me" {
+			out = append(out, method+" "+path)
+		}
+	}
+	for _, f := range files {
+		if strings.HasSuffix(f, "_test.go") {
+			continue
+		}
+		b, _ := os.ReadFile(f)
+		for _, m := range literal.FindAllStringSubmatch(string(b), -1) {
+			add(m[1], m[2])
+		}
+		for _, m := range built.FindAllStringSubmatch(string(b), -1) {
+			c, ok := consts[m[2]]
+			if !ok {
+				t.Fatalf("a route built from %s, which this test does not know", m[2])
+			}
+			add(m[1], c+m[4])
+		}
+	}
+	slices.Sort(out)
+	return slices.Compact(out)
+}
+
+func TestEveryClientRouteIsDescribedAndNothingElse(t *testing.T) {
+	// An endpoint added to the router and not to this table would be missing
+	// from the document every SDK is generated from; one here and not in the
+	// router would be a path that answers 404.
+	mounted := routerRoutes(t)
+	if len(mounted) < 30 {
+		t.Fatalf("read only %d routes from the router: %v", len(mounted), mounted)
+	}
+	var described []string
+	for _, r := range Routes {
+		described = append(described, r.Method+" "+r.Path)
+	}
+	slices.Sort(described)
+	for _, m := range mounted {
+		if m == "GET /v1/openapi.json" {
+			continue // the document itself
+		}
+		if !slices.Contains(described, m) {
+			t.Errorf("%s is mounted and not described in clientapi.Routes", m)
+		}
+	}
+	for _, d := range described {
+		if !slices.Contains(mounted, d) {
+			t.Errorf("%s is described and not mounted", d)
+		}
+	}
+}

internal/comfy/comfy.go

@@ -0,0 +1,789 @@
+// Package comfy has images made by ComfyUI: a workflow filled in with what
+// was asked for, queued, waited on, and its pictures fetched.
+//
+// ComfyUI speaks no OpenAI. A workflow is a graph of nodes that is queued with
+// POST /prompt, is done when GET /history/{id} lists it, and leaves its
+// pictures to be read one by one from GET /view. What the graph is depends on
+// the model — FLUX schnell is not FLUX dev, and neither is SDXL — so the graph
+// is a template the catalog names, with placeholders where a request's
+// prompt, size and seed go.
+package comfy
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"embed"
+	"encoding/binary"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"math/big"
+	"mime/multipart"
+	"net/http"
+	"net/url"
+	"path"
+	"slices"
+	"strconv"
+	"strings"
+	"time"
+)
+
+//go:embed workflows/*.json
+var builtin embed.FS
+
+// DefaultWorkflow is the template used when the catalog names none.
+const DefaultWorkflow = "flux-schnell"
+
+// Builtins are the workflows that come with llmgw, by name.
+func Builtins() []string {
+	entries, _ := builtin.ReadDir("workflows")
+	out := make([]string, 0, len(entries))
+	for _, e := range entries {
+		out = append(out, strings.TrimSuffix(e.Name(), ".json"))
+	}
+	return out
+}
+
+// Template is a workflow in ComfyUI's API format, with placeholders.
+//
+// A placeholder is a string value "{{name}}", or "{{name|default}}" for one a
+// request may leave out. One that is the whole value becomes the value
+// itself, a number where the node wants a number; one inside a longer string
+// is written into it. The names are those of Params.
+type Template struct {
+	graph map[string]any
+}
+
+// Load reads a template: a built-in's name, or the workflow's JSON itself.
+func Load(nameOrJSON string) (*Template, error) {
+	s := strings.TrimSpace(nameOrJSON)
+	if s == "" {
+		s = DefaultWorkflow
+	}
+	raw := []byte(s)
+	if !strings.HasPrefix(s, "{") {
+		b, err := builtin.ReadFile("workflows/" + s + ".json")
+		if err != nil {
+			return nil, fmt.Errorf("no built-in workflow %q (there are %s)", s, strings.Join(Builtins(), ", "))
+		}
+		raw = b
+	}
+	var g map[string]any
+	if err := json.Unmarshal(raw, &g); err != nil {
+		return nil, fmt.Errorf("the workflow is not JSON: %w", err)
+	}
+	if len(g) == 0 {
+		return nil, errors.New("the workflow has no nodes")
+	}
+	for id, n := range g {
+		node, ok := n.(map[string]any)
+		if !ok || node["class_type"] == nil {
+			// The UI's own save format has a "nodes" list instead, and is
+			// not something /prompt accepts.
+			return nil, fmt.Errorf("node %q has no class_type: the workflow must be saved in API format", id)
+		}
+	}
+	return &Template{graph: g}, nil
+}
+
+// Params are what a request decides. A zero number is one not given, which
+// leaves it to the template's default.
+type Params struct {
+	Checkpoint     string
+	Prompt         string
+	NegativePrompt string
+	Width, Height  int
+	N              int
+	Seed           int64
+	Steps          int
+	Guidance       float64
+	// Image is the input picture, by the name Upload gave it in ComfyUI's
+	// input directory: {{image}}.
+	Image string
+	// Extra are a workflow's own placeholders, by name: {{resolution}}.
+	Extra map[string]any
+}
+
+func (p Params) value(name string) (any, bool) {
+	// A workflow's own input of a built-in's name is the request's: an input
+	// named prompt is the prompt a run was given.
+	if v, ok := p.Extra[name]; ok {
+		return v, true
+	}
+	switch name {
+	case "checkpoint":
+		return p.Checkpoint, p.Checkpoint != ""
+	case "prompt":
+		return p.Prompt, true
+	case "negative_prompt":
+		return p.NegativePrompt, true
+	case "width":
+		return p.Width, p.Width > 0
+	case "height":
+		return p.Height, p.Height > 0
+	case "n":
+		return max(p.N, 1), true
+	case "seed":
+		return p.Seed, true
+	case "steps":
+		return p.Steps, p.Steps > 0
+	case "guidance":
+		return p.Guidance, p.Guidance > 0
+	case "image":
+		return p.Image, p.Image != ""
+	}
+	return nil, false
+}
+
+// Builtin are the placeholders Params fills by itself, which a workflow may
+// use without declaring them as inputs.
+var Builtin = []string{"checkpoint", "prompt", "negative_prompt", "width", "height", "n", "seed", "steps", "guidance", "image"}
+
+// Placeholders are the names a template's placeholders use, each once,
+// sorted, and whether each has a default of its own.
+func (t *Template) Placeholders() map[string]bool {
+	out := map[string]bool{}
+	var walk func(v any)
+	walk = func(v any) {
+		switch v := v.(type) {
+		case map[string]any:
+			for _, x := range v {
+				walk(x)
+			}
+		case []any:
+			for _, x := range v {
+				walk(x)
+			}
+		case string:
+			for s := v; ; {
+				i := strings.Index(s, "{{")
+				j := strings.Index(s, "}}")
+				if i < 0 || j < i {
+					return
+				}
+				name, _, hasDef := strings.Cut(s[i+2:j], "|")
+				name = strings.TrimSpace(name)
+				out[name] = out[name] || hasDef
+				s = s[j+2:]
+			}
+		}
+	}
+	walk(t.graph)
+	return out
+}
+
+// Fill is the workflow for one request.
+func (t *Template) Fill(p Params) (map[string]any, error) {
+	var missing []string
+	var fill func(v any) any
+	fill = func(v any) any {
+		switch v := v.(type) {
+		case map[string]any:
+			out := make(map[string]any, len(v))
+			for k, x := range v {
+				out[k] = fill(x)
+			}
+			return out
+		case []any:
+			out := make([]any, len(v))
+			for i, x := range v {
+				out[i] = fill(x)
+			}
+			return out
+		case string:
+			return fillString(v, p, &missing)
+		}
+		return v
+	}
+	g := fill(t.graph).(map[string]any)
+	if len(missing) > 0 {
+		slices.Sort(missing)
+		return nil, fmt.Errorf("the workflow wants %s, which the request did not give and the workflow has no default for",
+			strings.Join(slices.Compact(missing), ", "))
+	}
+	return g, nil
+}
+
+func fillString(s string, p Params, missing *[]string) any {
+	if !strings.Contains(s, "{{") {
+		return s
+	}
+	resolve := func(ph string) (any, bool) {
+		name, def, hasDef := strings.Cut(ph, "|")
+		name = strings.TrimSpace(name)
+		if v, ok := p.value(name); ok {
+			return v, true
+		}
+		if hasDef {
+			def = strings.TrimSpace(def)
+			if f, err := strconv.ParseFloat(def, 64); err == nil {
+				return f, true
+			}
+			// A BOOLEAN input refuses the word: {{albedo_match|false}}.
+			if b, err := strconv.ParseBool(def); err == nil && (def == "true" || def == "false") {
+				return b, true
+			}
+			return def, true
+		}
+		*missing = append(*missing, name)
+		return nil, false
+	}
+	// The whole value: what the node gets is the value, not its text.
+	if strings.HasPrefix(s, "{{") && strings.HasSuffix(s, "}}") && strings.Count(s, "{{") == 1 {
+		v, _ := resolve(s[2 : len(s)-2])
+		return v
+	}
+	var b strings.Builder
+	for {
+		i := strings.Index(s, "{{")
+		j := strings.Index(s, "}}")
+		if i < 0 || j < i {
+			b.WriteString(s)
+			return b.String()
+		}
+		b.WriteString(s[:i])
+		if v, ok := resolve(s[i+2 : j]); ok {
+			fmt.Fprint(&b, v)
+		}
+		s = s[j+2:]
+	}
+}
+
+// RandomSeed is a seed for a request that named none. ComfyUI's are 64-bit,
+// but JSON numbers are read as doubles on the way: kept to 2^53.
+func RandomSeed() int64 {
+	n, err := rand.Int(rand.Reader, big.NewInt(1<<53))
+	if err != nil {
+		return time.Now().UnixNano() & (1<<53 - 1)
+	}
+	return n.Int64()
+}
+
+// Image is one file a workflow made: a picture, a mesh.
+type Image struct {
+	Data        []byte
+	ContentType string
+	// Name is the file's own, as ComfyUI saved it.
+	Name string
+}
+
+// Error is a failure, said as what it means for the request.
+type Error struct {
+	Msg string
+	// Retryable is a failure of this server, which another one might not
+	// have: it could not be reached, or it answered 5xx.
+	Retryable bool
+}
+
+func (e *Error) Error() string { return e.Msg }
+
+// Client queues workflows and waits for them.
+type Client struct {
+	HTTP *http.Client
+	// Poll is how often a queued workflow is asked after.
+	Poll time.Duration
+}
+
+// Generate runs a workflow on the ComfyUI at base and returns its pictures,
+// in the order of the nodes that made them. A context that ends takes the
+// workflow out of the queue, or interrupts it if it is running, so a client
+// that went away does not leave the card working for nobody.
+func (c *Client) Generate(ctx context.Context, base, apiKey string, workflow map[string]any) ([]Image, error) {
+	return c.GenerateWatch(ctx, base, apiKey, workflow, nil)
+}
+
+// progressEvery is how often a workflow's progress is asked after, beside
+// its history: a few requests a second is for the end, not for the news.
+const progressEvery = time.Second
+
+// GenerateWatch is Generate, saying how far along the workflow is as it
+// changes: queued and how many ahead, then the node running and its step.
+func (c *Client) GenerateWatch(ctx context.Context, base, apiKey string, workflow map[string]any,
+	onProgress func(Progress)) ([]Image, error) {
+	base = strings.TrimRight(base, "/")
+	client := make([]byte, 8)
+	_, _ = rand.Read(client)
+	body, err := json.Marshal(map[string]any{"prompt": workflow, "client_id": "llmgw-" + hex.EncodeToString(client)})
+	if err != nil {
+		return nil, err
+	}
+	var queued struct {
+		PromptID   string          `json:"prompt_id"`
+		Error      json.RawMessage `json:"error"`
+		NodeErrors json.RawMessage `json:"node_errors"`
+	}
+	status, err := c.do(ctx, http.MethodPost, base+"/prompt", apiKey, body, &queued)
+	if err != nil {
+		return nil, err
+	}
+	if status != http.StatusOK || queued.PromptID == "" {
+		// A workflow ComfyUI will not run: a checkpoint it does not have, a
+		// node it does not know. The catalog's to fix, not the client's, and
+		// no other replica set up the same way would take it either.
+		return nil, &Error{Msg: "ComfyUI refused the workflow: " + refusal(queued.Error, queued.NodeErrors)}
+	}
+	id := queued.PromptID
+
+	poll := c.Poll
+	if poll <= 0 {
+		poll = 250 * time.Millisecond
+	}
+	t := time.NewTicker(poll)
+	defer t.Stop()
+	var last Progress
+	var asked time.Time
+	for {
+		select {
+		case <-ctx.Done():
+			c.cancel(context.WithoutCancel(ctx), base, apiKey, id)
+			return nil, ctx.Err()
+		case <-t.C:
+		}
+		if onProgress != nil && time.Since(asked) >= progressEvery {
+			asked = time.Now()
+			if p, ok := c.progress(ctx, base, apiKey, id, workflow); ok && p != last {
+				last = p
+				onProgress(p)
+			}
+		}
+		var hist map[string]historyEntry
+		if _, err := c.do(ctx, http.MethodGet, base+"/history/"+url.PathEscape(id), apiKey, nil, &hist); err != nil {
+			if ctx.Err() != nil {
+				continue // said by the select
+			}
+			return nil, err
+		}
+		h, ok := hist[id]
+		if !ok {
+			continue
+		}
+		if h.Status.StatusStr == "error" {
+			return nil, &Error{Msg: "the workflow failed in ComfyUI: " + h.failure()}
+		}
+		if !h.Status.Completed {
+			continue
+		}
+		return c.fetch(ctx, base, apiKey, h)
+	}
+}
+
+type historyEntry struct {
+	Status struct {
+		StatusStr string              `json:"status_str"`
+		Completed bool                `json:"completed"`
+		Messages  [][]json.RawMessage `json:"messages"`
+	} `json:"status"`
+	// Outputs are each node's, by kind: "images" for a picture, "3d" for
+	// the mesh a 3D node saves, and whatever else a custom node names.
+	Outputs map[string]map[string]json.RawMessage `json:"outputs"`
+}
+
+// fileRef is a file an output names, to be read from /view.
+type fileRef struct {
+	Filename  string `json:"filename"`
+	Subfolder string `json:"subfolder"`
+	Type      string `json:"type"`
+}
+
+// failure is what ComfyUI said went wrong, from its execution_error.
+func (h historyEntry) failure() string {
+	for _, m := range h.Status.Messages {
+		if len(m) < 2 || string(m[0]) != `"execution_error"` {
+			continue
+		}
+		var e struct {
+			NodeType string `json:"node_type"`
+			Message  string `json:"exception_message"`
+		}
+		if json.Unmarshal(m[1], &e) == nil && e.Message != "" {
+			return strings.TrimSpace(e.NodeType + ": " + strings.TrimSpace(e.Message))
+		}
+	}
+	return "no reason given"
+}
+
+func (c *Client) fetch(ctx context.Context, base, apiKey string, h historyEntry) ([]Image, error) {
+	nodes := make([]string, 0, len(h.Outputs))
+	for id := range h.Outputs {
+		nodes = append(nodes, id)
+	}
+	// Numerically where they are numbers, which is how ComfyUI names them.
+	slices.SortFunc(nodes, func(a, b string) int {
+		x, ea := strconv.Atoi(a)
+		y, eb := strconv.Atoi(b)
+		if ea == nil && eb == nil {
+			return x - y
+		}
+		return strings.Compare(a, b)
+	})
+	var out []Image
+	for _, n := range nodes {
+		kinds := make([]string, 0, len(h.Outputs[n]))
+		for k := range h.Outputs[n] {
+			kinds = append(kinds, k)
+		}
+		slices.Sort(kinds)
+		for _, k := range kinds {
+			// Any list of files, whatever the node calls it; text and
+			// numbers a node reports beside them are not files.
+			var refs []fileRef
+			if json.Unmarshal(h.Outputs[n][k], &refs) != nil {
+				continue
+			}
+			for _, f := range refs {
+				if f.Filename == "" {
+					continue
+				}
+				q := url.Values{"filename": {f.Filename}, "subfolder": {f.Subfolder}, "type": {f.Type}}
+				img, err := c.get(ctx, base+"/view?"+q.Encode(), apiKey)
+				if err != nil {
+					return nil, err
+				}
+				img.Name = f.Filename
+				// A type the server did not say is the file's by its name,
+				// else by its first bytes.
+				if generic(img.ContentType) {
+					if t := typeByName(f.Filename); t != "" {
+						img.ContentType = t
+					} else {
+						img.ContentType = http.DetectContentType(img.Data)
+					}
+				}
+				if img.ContentType == "image/png" {
+					img.Data = withoutPNGText(img.Data)
+				}
+				out = append(out, img)
+			}
+		}
+	}
+	if len(out) == 0 {
+		return nil, &Error{Msg: "the workflow finished without a file: it has no node that saves one"}
+	}
+	return out, nil
+}
+
+// cancel takes a workflow out of the queue, or stops it if it is the one
+// running. Best effort: the server may be gone, which also stops it.
+func (c *Client) cancel(ctx context.Context, base, apiKey, id string) {
+	ctx, done := context.WithTimeout(ctx, 5*time.Second)
+	defer done()
+	body, _ := json.Marshal(map[string]any{"delete": []string{id}})
+	_, _ = c.do(ctx, http.MethodPost, base+"/queue", apiKey, body, nil)
+	var q struct {
+		Running [][]json.RawMessage `json:"queue_running"`
+	}
+	if _, err := c.do(ctx, http.MethodGet, base+"/queue", apiKey, nil, &q); err != nil {
+		return
+	}
+	for _, r := range q.Running {
+		if len(r) > 1 && string(r[1]) == strconv.Quote(id) {
+			_, _ = c.do(ctx, http.MethodPost, base+"/interrupt", apiKey, []byte("{}"), nil)
+			return
+		}
+	}
+}
+
+func (c *Client) client() *http.Client {
+	if c.HTTP != nil {
+		return c.HTTP
+	}
+	return http.DefaultClient
+}
+
+func (c *Client) request(ctx context.Context, method, u, apiKey string, body []byte) (*http.Response, error) {
+	req, err := http.NewRequestWithContext(ctx, method, u, bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	if apiKey != "" {
+		req.Header.Set("Authorization", "Bearer "+apiKey)
+	}
+	resp, err := c.client().Do(req)
+	if err != nil {
+		if ctx.Err() != nil {
+			return nil, ctx.Err()
+		}
+		return nil, &Error{Msg: "ComfyUI could not be reached: " + err.Error(), Retryable: true}
+	}
+	return resp, nil
+}
+
+// do sends a request and reads a JSON answer into out. A 5xx is an error;
+// any other status is returned with whatever body could be read.
+func (c *Client) do(ctx context.Context, method, u, apiKey string, body []byte, out any) (int, error) {
+	resp, err := c.request(ctx, method, u, apiKey, body)
+	if err != nil {
+		return 0, err
+	}
+	defer resp.Body.Close()
+	b, err := io.ReadAll(io.LimitReader(resp.Body, 16<<20))
+	if err != nil {
+		return 0, &Error{Msg: "reading ComfyUI's answer: " + err.Error(), Retryable: true}
+	}
+	if resp.StatusCode >= 500 {
+		return resp.StatusCode, &Error{Msg: fmt.Sprintf("ComfyUI answered %d: %s", resp.StatusCode, snippet(b)), Retryable: true}
+	}
+	if out != nil && len(b) > 0 {
+		if err := json.Unmarshal(b, out); err != nil && resp.StatusCode == http.StatusOK {
+			return resp.StatusCode, &Error{Msg: "ComfyUI's answer is not JSON: " + snippet(b)}
+		}
+	}
+	return resp.StatusCode, nil
+}
+
+func (c *Client) get(ctx context.Context, u, apiKey string) (Image, error) {
+	resp, err := c.request(ctx, http.MethodGet, u, apiKey, nil)
+	if err != nil {
+		return Image{}, err
+	}
+	defer resp.Body.Close()
+	b, err := io.ReadAll(io.LimitReader(resp.Body, maxFile))
+	if err != nil {
+		return Image{}, &Error{Msg: "reading a file from ComfyUI: " + err.Error(), Retryable: true}
+	}
+	if resp.StatusCode != http.StatusOK {
+		return Image{}, &Error{Msg: fmt.Sprintf("ComfyUI answered %d for a file it made", resp.StatusCode)}
+	}
+	return Image{Data: b, ContentType: resp.Header.Get("Content-Type")}, nil
+}
+
+// generic is a type that says nothing of what a file is.
+func generic(ct string) bool {
+	return ct == "" || strings.HasPrefix(ct, "application/octet-stream") || strings.HasPrefix(ct, "text/plain")
+}
+
+// withoutPNGText is a PNG without its text chunks. ComfyUI writes the whole
+// workflow into every picture it saves — the prompt, and the checkpoint and
+// nodes behind it — and what a picture says about how it was made is the
+// operator's to publish, not something to hand every client. A file that is
+// not a well-formed PNG is returned as it came.
+func withoutPNGText(b []byte) []byte {
+	const sig = "\x89PNG\r\n\x1a\n"
+	if len(b) < len(sig) || string(b[:len(sig)]) != sig {
+		return b
+	}
+	out := make([]byte, 0, len(b))
+	out = append(out, b[:len(sig)]...)
+	for i := len(sig); i < len(b); {
+		if i+12 > len(b) {
+			return b
+		}
+		n := int(binary.BigEndian.Uint32(b[i:]))
+		end := i + 12 + n
+		if n < 0 || end > len(b) {
+			return b
+		}
+		switch string(b[i+4 : i+8]) {
+		case "tEXt", "iTXt", "zTXt":
+		default:
+			out = append(out, b[i:end]...)
+		}
+		i = end
+	}
+	return out
+}
+
+// refusal is what /prompt said when it would not queue a workflow.
+func refusal(e, nodes json.RawMessage) string {
+	var top struct {
+		Message string `json:"message"`
+		Details string `json:"details"`
+	}
+	msg := snippet(e)
+	if json.Unmarshal(e, &top) == nil && top.Message != "" {
+		msg = top.Message
+		if top.Details != "" {
+			msg += ": " + top.Details
+		}
+	}
+	var perNode map[string]struct {
+		ClassType string `json:"class_type"`
+		Errors    []struct {
+			Message string `json:"message"`
+			Details string `json:"details"`
+		} `json:"errors"`
+	}
+	if json.Unmarshal(nodes, &perNode) == nil {
+		var parts []string
+		for _, n := range perNode {
+			for _, er := range n.Errors {
+				parts = append(parts, strings.TrimSpace(n.ClassType+": "+er.Message+" "+er.Details))
+			}
+		}
+		slices.Sort(parts)
+		if len(parts) > 0 {
+			msg += " (" + strings.Join(parts, "; ") + ")"
+		}
+	}
+	if msg == "" {
+		msg = "no reason given"
+	}
+	return msg
+}
+
+func snippet(b []byte) string {
+	s := strings.TrimSpace(string(b))
+	if len(s) > 300 {
+		s = s[:300] + "…"
+	}
+	return s
+}
+
+// maxFile bounds one file read from ComfyUI: a mesh with its textures runs
+// to tens of megabytes, a picture to a few.
+const maxFile = 256 << 20
+
+// typeByName is a file's type by its extension, for those a server sends
+// as octet-stream: the meshes a 3D node saves.
+func typeByName(name string) string {
+	switch strings.ToLower(path.Ext(name)) {
+	case ".glb":
+		return "model/gltf-binary"
+	case ".gltf":
+		return "model/gltf+json"
+	case ".obj":
+		return "model/obj"
+	case ".stl":
+		return "model/stl"
+	case ".ply":
+		return "application/ply"
+	case ".png":
+		return "image/png"
+	case ".jpg", ".jpeg":
+		return "image/jpeg"
+	case ".webp":
+		return "image/webp"
+	case ".gif":
+		return "image/gif"
+	case ".mp4":
+		return "video/mp4"
+	case ".webm":
+		return "video/webm"
+	case ".mov":
+		return "video/quicktime"
+	case ".wav":
+		return "audio/wav"
+	case ".mp3":
+		return "audio/mpeg"
+	case ".flac":
+		return "audio/flac"
+	case ".ogg", ".opus":
+		return "audio/ogg"
+	}
+	return ""
+}
+
+// Upload puts a file in ComfyUI's input directory, where a loader node reads
+// it — LoadImage, LoadAudio, LoadVideo, whatever the workflow uses: ComfyUI's
+// /upload/image takes any file — and returns the name it was given there.
+func (c *Client) Upload(ctx context.Context, base, apiKey, name string, data []byte) (string, error) {
+	base = strings.TrimRight(base, "/")
+	var body bytes.Buffer
+	mw := multipart.NewWriter(&body)
+	fw, err := mw.CreateFormFile("image", name)
+	if err != nil {
+		return "", err
+	}
+	if _, err := fw.Write(data); err != nil {
+		return "", err
+	}
+	_ = mw.WriteField("type", "input")
+	_ = mw.WriteField("overwrite", "true")
+	if err := mw.Close(); err != nil {
+		return "", err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, base+"/upload/image", &body)
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Content-Type", mw.FormDataContentType())
+	if apiKey != "" {
+		req.Header.Set("Authorization", "Bearer "+apiKey)
+	}
+	resp, err := c.client().Do(req)
+	if err != nil {
+		if ctx.Err() != nil {
+			return "", ctx.Err()
+		}
+		return "", &Error{Msg: "ComfyUI could not be reached: " + err.Error(), Retryable: true}
+	}
+	defer resp.Body.Close()
+	b, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode >= 500 {
+		return "", &Error{Msg: fmt.Sprintf("ComfyUI answered %d to the picture: %s", resp.StatusCode, snippet(b)), Retryable: true}
+	}
+	var out struct {
+		Name      string `json:"name"`
+		Subfolder string `json:"subfolder"`
+	}
+	if resp.StatusCode != http.StatusOK || json.Unmarshal(b, &out) != nil || out.Name == "" {
+		return "", &Error{Msg: fmt.Sprintf("ComfyUI did not take the picture (%d): %s", resp.StatusCode, snippet(b))}
+	}
+	if out.Subfolder != "" {
+		return out.Subfolder + "/" + out.Name, nil
+	}
+	return out.Name, nil
+}
+
+// progress is a workflow's: its place in the queue, from ComfyUI, and the
+// node running and its step, from the gate when there is one — a ComfyUI
+// outside the cluster has no gate, and says only where it is queued.
+func (c *Client) progress(ctx context.Context, base, apiKey, id string, workflow map[string]any) (Progress, bool) {
+	p := Progress{PromptID: id, State: "queued"}
+	var q struct {
+		Running [][]json.RawMessage `json:"queue_running"`
+		Pending [][]json.RawMessage `json:"queue_pending"`
+	}
+	if _, err := c.do(ctx, http.MethodGet, base+"/queue", apiKey, nil, &q); err != nil {
+		return p, false
+	}
+	quoted := strconv.Quote(id)
+	queued := false
+	for _, r := range q.Running {
+		if len(r) > 1 && string(r[1]) == quoted {
+			p.State = "running"
+		}
+	}
+	if p.State != "running" {
+		// Pending in the order ComfyUI will take them: by number.
+		mine := -1.0
+		var numbers []float64
+		for _, r := range q.Pending {
+			if len(r) < 2 {
+				continue
+			}
+			var n float64
+			_ = json.Unmarshal(r[0], &n)
+			if string(r[1]) == quoted {
+				mine, queued = n, true
+				continue
+			}
+			numbers = append(numbers, n)
+		}
+		if queued {
+			p.Ahead = len(q.Running)
+			for _, n := range numbers {
+				if n < mine {
+					p.Ahead++
+				}
+			}
+			return p, true
+		}
+	}
+	var g Progress
+	if st, err := c.do(ctx, http.MethodGet, base+"/progress/"+url.PathEscape(id), apiKey, nil, &g); err == nil &&
+		st == http.StatusOK && g.State != "" {
+		p = g
+		p.PromptID = id
+		if node, ok := workflow[p.Node].(map[string]any); ok {
+			p.NodeClass, _ = node["class_type"].(string)
+		}
+	}
+	return p, true
+}

internal/comfy/comfy_test.go

@@ -0,0 +1,270 @@
+package comfy
+
+import (
+	"context"
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestTheBuiltInWorkflowsFillIn(t *testing.T) {
+	for _, name := range Builtins() {
+		if raw, _ := builtin.ReadFile("workflows/" + name + ".json"); strings.Contains(string(raw), "{{image}}") {
+			continue // made from a picture: TestTheBuiltInMeshWorkflowFillsIn
+		}
+		tpl, err := Load(name)
+		if err != nil {
+			t.Fatalf("%s: %v", name, err)
+		}
+		g, err := tpl.Fill(Params{Checkpoint: "flux.safetensors", Prompt: `a "red" fox`, Width: 768, Height: 512, N: 2, Seed: 42})
+		if err != nil {
+			t.Fatalf("%s: %v", name, err)
+		}
+		b, _ := json.Marshal(g)
+		s := string(b)
+		for _, want := range []string{`"ckpt_name":"flux.safetensors"`, `"text":"a \"red\" fox"`, `"width":768`,
+			`"height":512`, `"batch_size":2`, `"seed":42`} {
+			if !strings.Contains(s, want) {
+				t.Errorf("%s: %s not in %s", name, want, s)
+			}
+		}
+		if strings.Contains(s, "{{") {
+			t.Errorf("%s: a placeholder was left: %s", name, s)
+		}
+	}
+}
+
+func TestTheBuiltInMeshWorkflowFillsIn(t *testing.T) {
+	tpl, err := Load("triposr")
+	if err != nil {
+		t.Fatal(err)
+	}
+	g, err := tpl.Fill(Params{Checkpoint: "model.ckpt", Image: "llmgw-1.png"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, _ := json.Marshal(g)
+	s := string(b)
+	// The picture is cut out and centred before TripoSR sees it: without
+	// that, its background becomes geometry.
+	for _, want := range []string{`"image":"llmgw-1.png"`, `"model":"model.ckpt"`, `"geometry_resolution":256`,
+		`"class_type":"LLMGWPrepareForMesh"`, `"reference_image":["5",0]`} {
+		if !strings.Contains(s, want) {
+			t.Errorf("%s not in %s", want, s)
+		}
+	}
+	if strings.Contains(s, "{{") {
+		t.Errorf("a placeholder was left: %s", s)
+	}
+}
+
+func TestAStepCountGivenReplacesTheDefault(t *testing.T) {
+	tpl, _ := Load("flux-schnell")
+	g, _ := tpl.Fill(Params{Checkpoint: "c", Prompt: "p", Width: 512, Height: 512})
+	if steps := g["5"].(map[string]any)["inputs"].(map[string]any)["steps"]; steps != 4.0 {
+		t.Errorf("default steps = %v, want 4", steps)
+	}
+	g, _ = tpl.Fill(Params{Checkpoint: "c", Prompt: "p", Width: 512, Height: 512, Steps: 8})
+	if steps := g["5"].(map[string]any)["inputs"].(map[string]any)["steps"]; steps != 8 {
+		t.Errorf("steps = %v, want 8", steps)
+	}
+}
+
+func TestAPlaceholderWithoutAValueOrADefaultIsSaid(t *testing.T) {
+	tpl, err := Load(`{"1":{"class_type":"X","inputs":{"a":"{{checkpoint}}","b":"size {{width}}x{{height}}"}}}`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := tpl.Fill(Params{Width: 5}); err == nil || !strings.Contains(err.Error(), "checkpoint, height") {
+		t.Fatalf("err = %v", err)
+	}
+	g, err := tpl.Fill(Params{Checkpoint: "c", Width: 5, Height: 6})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if b := g["1"].(map[string]any)["inputs"].(map[string]any)["b"]; b != "size 5x6" {
+		t.Errorf("b = %v", b)
+	}
+}
+
+func TestAWorkflowInTheUIsFormatIsRefused(t *testing.T) {
+	if _, err := Load(`{"nodes":[{"id":1}],"links":[]}`); err == nil || !strings.Contains(err.Error(), "API format") {
+		t.Fatalf("err = %v", err)
+	}
+	if _, err := Load("sdxl-turbo"); err == nil {
+		t.Fatal("an unknown built-in was loaded")
+	}
+}
+
+// fakeComfy is just enough of ComfyUI: /prompt queues, /history answers
+// after a few asks, /view serves a picture.
+type fakeComfy struct {
+	mu          sync.Mutex
+	asked       int
+	fail        string
+	refuse      bool
+	deleted     []string
+	queued      map[string]any
+	readyAt     int
+	srv         *httptest.Server
+	interrupted bool
+}
+
+func newFakeComfy(t *testing.T) *fakeComfy {
+	f := &fakeComfy{readyAt: 2}
+	f.srv = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		f.mu.Lock()
+		defer f.mu.Unlock()
+		switch {
+		case r.Method == http.MethodPost && r.URL.Path == "/prompt":
+			if f.refuse {
+				w.WriteHeader(http.StatusBadRequest)
+				fmt.Fprint(w, `{"error":{"message":"Prompt outputs failed validation","details":""},"node_errors":{"1":{"class_type":"CheckpointLoaderSimple","errors":[{"message":"Value not in list","details":"ckpt_name: 'x' not in []"}]}}}`)
+				return
+			}
+			var b struct {
+				Prompt map[string]any `json:"prompt"`
+			}
+			_ = json.NewDecoder(r.Body).Decode(&b)
+			f.queued = b.Prompt
+			fmt.Fprint(w, `{"prompt_id":"p1","number":1,"node_errors":{}}`)
+		case r.URL.Path == "/history/p1":
+			f.asked++
+			if f.asked < f.readyAt {
+				fmt.Fprint(w, `{}`)
+				return
+			}
+			if f.fail != "" {
+				fmt.Fprintf(w, `{"p1":{"status":{"status_str":"error","completed":false,"messages":[["execution_start",{}],["execution_error",{"node_type":"KSampler","exception_message":%q}]]},"outputs":{}}}`, f.fail)
+				return
+			}
+			fmt.Fprint(w, `{"p1":{"status":{"status_str":"success","completed":true,"messages":[]},"outputs":{"7":{"images":[{"filename":"a.png","subfolder":"","type":"temp"},{"filename":"b.png","subfolder":"","type":"temp"}]}}}}`)
+		case r.URL.Path == "/view":
+			w.Header().Set("Content-Type", "image/png")
+			fmt.Fprint(w, "PNG:"+r.URL.Query().Get("filename"))
+		case r.URL.Path == "/queue" && r.Method == http.MethodPost:
+			var b struct {
+				Delete []string `json:"delete"`
+			}
+			_ = json.NewDecoder(r.Body).Decode(&b)
+			f.deleted = append(f.deleted, b.Delete...)
+		case r.URL.Path == "/queue":
+			fmt.Fprint(w, `{"queue_running":[[1,"p1",{},{},[]]],"queue_pending":[]}`)
+		case r.URL.Path == "/interrupt":
+			f.interrupted = true
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	t.Cleanup(f.srv.Close)
+	return f
+}
+
+func TestGenerateWaitsForTheWorkflowAndFetchesItsPictures(t *testing.T) {
+	f := newFakeComfy(t)
+	c := &Client{Poll: time.Millisecond}
+	images, err := c.Generate(t.Context(), f.srv.URL, "", map[string]any{"1": map[string]any{"class_type": "X"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(images) != 2 || string(images[0].Data) != "PNG:a.png" || images[1].ContentType != "image/png" {
+		t.Fatalf("images = %+v", images)
+	}
+	if f.queued["1"] == nil {
+		t.Error("the workflow was not what was queued")
+	}
+}
+
+func TestAWorkflowThatFailsSaysWhy(t *testing.T) {
+	f := newFakeComfy(t)
+	f.fail = "CUDA out of memory"
+	_, err := (&Client{Poll: time.Millisecond}).Generate(t.Context(), f.srv.URL, "", map[string]any{})
+	if err == nil || !strings.Contains(err.Error(), "KSampler: CUDA out of memory") {
+		t.Fatalf("err = %v", err)
+	}
+}
+
+func TestAWorkflowComfyUIRefusesIsNotRetried(t *testing.T) {
+	f := newFakeComfy(t)
+	f.refuse = true
+	_, err := (&Client{Poll: time.Millisecond}).Generate(t.Context(), f.srv.URL, "", map[string]any{})
+	ce, ok := err.(*Error)
+	if !ok || ce.Retryable || !strings.Contains(ce.Msg, "Value not in list") {
+		t.Fatalf("err = %#v", err)
+	}
+}
+
+func TestAComfyUIThatCannotBeReachedIsRetryable(t *testing.T) {
+	f := newFakeComfy(t)
+	f.srv.Close()
+	_, err := (&Client{Poll: time.Millisecond}).Generate(t.Context(), f.srv.URL, "", map[string]any{})
+	if ce, ok := err.(*Error); !ok || !ce.Retryable {
+		t.Fatalf("err = %#v", err)
+	}
+}
+
+func TestAClientThatLeavesTakesItsWorkflowOffTheCard(t *testing.T) {
+	f := newFakeComfy(t)
+	f.readyAt = 1 << 30
+	ctx, cancel := context.WithTimeout(t.Context(), 30*time.Millisecond)
+	defer cancel()
+	_, err := (&Client{Poll: time.Millisecond}).Generate(ctx, f.srv.URL, "", map[string]any{})
+	if err == nil {
+		t.Fatal("no error")
+	}
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if len(f.deleted) != 1 || f.deleted[0] != "p1" || !f.interrupted {
+		t.Errorf("deleted %v, interrupted %v", f.deleted, f.interrupted)
+	}
+}
+
+func TestAPictureLosesTheWorkflowComfyUIWroteIntoIt(t *testing.T) {
+	chunk := func(kind, data string) []byte {
+		b := make([]byte, 0, 12+len(data))
+		b = binary.BigEndian.AppendUint32(b, uint32(len(data)))
+		b = append(b, kind...)
+		b = append(b, data...)
+		return append(b, 0, 0, 0, 0) // a CRC nobody here checks
+	}
+	png := []byte("\x89PNG\r\n\x1a\n")
+	png = append(png, chunk("IHDR", "0123456789abc")...)
+	png = append(png, chunk("tEXt", "prompt\x00{\"1\":...}")...)
+	png = append(png, chunk("IDAT", "pixels")...)
+	png = append(png, chunk("iTXt", "workflow\x00...")...)
+	png = append(png, chunk("IEND", "")...)
+	got := string(withoutPNGText(png))
+	if strings.Contains(got, "prompt") || strings.Contains(got, "workflow") {
+		t.Errorf("text left in: %q", got)
+	}
+	for _, kind := range []string{"IHDR", "IDAT", "pixels", "IEND"} {
+		if !strings.Contains(got, kind) {
+			t.Errorf("%s gone: %q", kind, got)
+		}
+	}
+	if broken := png[:30]; string(withoutPNGText(broken)) != string(broken) {
+		t.Error("a truncated PNG was changed")
+	}
+}
+
+func TestATrueOrFalseDefaultIsABoolean(t *testing.T) {
+	// A BOOLEAN input refuses the word "false": sf3d's albedo_match.
+	tpl, err := Load((`{"5":{"class_type":"LLMGWSaveMesh","inputs":{"albedo_match":"{{albedo_match|false}}","count":"{{count|2}}","s":"{{s|x}}"}}}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	g, err := tpl.Fill(Params{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	in := g["5"].(map[string]any)["inputs"].(map[string]any)
+	if in["albedo_match"] != false || in["count"] != 2.0 || in["s"] != "x" {
+		t.Errorf("inputs %#v", in)
+	}
+}

internal/comfy/gate.go

@@ -0,0 +1,586 @@
+package comfy
+
+import (
+	"context"
+	"crypto/rand"
+	"crypto/sha1"
+	"crypto/subtle"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"os"
+	"os/exec"
+	"os/signal"
+	"path/filepath"
+	"regexp"
+	"slices"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+)
+
+// The gate is how a node runs ComfyUI as one of llmgw's engines.
+//
+// ComfyUI asks nobody for a key: whoever reaches its port can queue work,
+// upload files and install nodes. Every other engine here demands the key
+// the control plane made for its replica, so ComfyUI is put behind a gate
+// that does: ComfyUI listens on the loopback only, and the gate on the
+// replica's port, letting through only the requests the router makes. The
+// gate also answers what the agent asks every engine — /health once
+// ComfyUI is up, and /v1/models naming the model — and lays the weights out
+// where ComfyUI looks for them.
+//
+// ComfyUI runs as the gate's child, in its process group, so stopping the
+// replica stops both, the card memory ComfyUI holds is counted as the
+// replica's, and either one exiting ends the other.
+
+// GateConfig is one replica's gate.
+type GateConfig struct {
+	// Listen is the replica's address, the one the router is given.
+	Listen string
+	// Model is the name the agent asks /v1/models for.
+	Model string
+	// Key is what every request must carry as a bearer token; empty lets
+	// every request through, as an engine started without one does.
+	Key string
+	// Weights is the model as the agent fetched it: a file, or a directory
+	// of files.
+	Weights string
+	// State is the replica's own directory: ComfyUI's base directory, with
+	// its output, temp and user directories, and the models it is shown.
+	State string
+	// Python runs ComfyUI's main.py, found in Dir.
+	Python, Dir string
+	// Args are passed on to main.py, after the gate's own.
+	Args []string
+	// Output is where ComfyUI's output goes.
+	Output io.Writer
+	Log    *slog.Logger
+}
+
+// The requests the router makes of ComfyUI: queueing, waiting, fetching and
+// cancelling. Nothing that uploads, installs or changes ComfyUI.
+var gatePaths = []string{"/prompt", "/history/", "/view", "/queue", "/interrupt", "/system_stats", "/object_info",
+	// The input picture of a 3D model: into ComfyUI's input directory,
+	// which is the replica's own.
+	"/upload/image"}
+
+// modelFolders are the kinds of file ComfyUI's loaders look for. Each is
+// shown the same directory: a workflow names its files, so a file being
+// listed where it is not wanted costs nothing.
+var modelFolders = []string{"checkpoints", "diffusion_models", "text_encoders", "vae", "loras",
+	"clip_vision", "controlnet", "upscale_models", "embeddings", "style_models"}
+
+// RunGate lays out the replica, starts ComfyUI and serves the gate until
+// ctx ends or ComfyUI exits.
+func RunGate(ctx context.Context, cfg GateConfig) error {
+	log := cfg.Log
+	if log == nil {
+		log = slog.Default()
+	}
+	state, err := filepath.Abs(cfg.State)
+	if err != nil {
+		return err
+	}
+	// What ComfyUI expects to find in its base directory, and dies
+	// without: custom_nodes is listed before anything else is done.
+	for _, d := range []string{"custom_nodes", "input", "output", "temp", "user"} {
+		if err := os.MkdirAll(filepath.Join(state, d), 0o755); err != nil {
+			return err
+		}
+	}
+	out := cfg.Output
+	if out == nil {
+		out = os.Stdout
+	}
+	if err := installOwnNodes(state); err != nil {
+		return fmt.Errorf("llmgw's own ComfyUI nodes: %w", err)
+	}
+	nodes, err := parseNodes(os.Getenv(NodesEnv))
+	if err != nil {
+		return err
+	}
+	site, err := installNodes(ctx, state, cfg.Python, nodes, findUV(), func(s string) { fmt.Fprintln(out, "[gate] "+s) })
+	if err != nil {
+		return err
+	}
+	models := filepath.Join(state, "models")
+	shared, err := parseShared(os.Getenv(SharedModelsEnv))
+	if err != nil {
+		return err
+	}
+	all := []string{cfg.Weights}
+	for _, m := range shared {
+		all = append(all, m.Path)
+	}
+	if err := LinkAllWeights(all, models); err != nil {
+		return err
+	}
+	if repo := os.Getenv(HFRepoEnv); repo != "" {
+		if err := LinkHFCache(cfg.Weights, repo, hfHubDir()); err != nil {
+			return fmt.Errorf("showing the weights as %s: %w", repo, err)
+		}
+	}
+	for _, m := range shared {
+		if m.HFRepo == "" {
+			continue
+		}
+		if err := LinkHFCache(m.Path, m.HFRepo, hfHubDir()); err != nil {
+			return fmt.Errorf("showing %s's weights as %s: %w", m.Name, m.HFRepo, err)
+		}
+	}
+	names := []string{cfg.Model}
+	for _, m := range shared {
+		if !slices.Contains(names, m.Name) {
+			names = append(names, m.Name)
+		}
+	}
+	extra := filepath.Join(state, "extra_model_paths.yaml")
+	if err := os.WriteFile(extra, []byte(extraModelPaths(models)), 0o644); err != nil { //nolint:gosec // not secret
+		return err
+	}
+
+	inner, err := freePort()
+	if err != nil {
+		return err
+	}
+	args := append([]string{filepath.Join(cfg.Dir, "main.py"),
+		"--listen", "127.0.0.1", "--port", strconv.Itoa(inner),
+		"--base-directory", state, "--extra-model-paths-config", extra,
+		"--disable-auto-launch"}, cfg.Args...)
+	child := exec.Command(cfg.Python, args...) //nolint:gosec // the agent's own configuration
+	child.Dir = cfg.Dir
+	child.Env = os.Environ()
+	if site != "" {
+		pp := site
+		if old := os.Getenv("PYTHONPATH"); old != "" {
+			pp += string(os.PathListSeparator) + old
+		}
+		child.Env = append(child.Env, "PYTHONPATH="+pp)
+	}
+	// ComfyUI writes to a pipe of the gate's, never to what the gate was
+	// given. That is the agent's, and an agent that restarts and adopts the
+	// replica leaves it with no reader: ComfyUI's next progress bar would
+	// fail with a broken pipe, and take the workflow it belongs to with it.
+	// The gate reads the pipe for as long as ComfyUI writes, and passes on
+	// what it can.
+	signal.Ignore(syscall.SIGPIPE)
+	pr, err := child.StdoutPipe()
+	if err != nil {
+		return err
+	}
+	child.Stderr = child.Stdout
+	if err := child.Start(); err != nil {
+		return fmt.Errorf("starting ComfyUI: %w", err)
+	}
+	relayed := make(chan struct{})
+	go func() { relay(pr, out); close(relayed) }()
+	exited := make(chan error, 1)
+	go func() {
+		// Wait closes the pipe; what is in it is read first.
+		<-relayed
+		exited <- child.Wait()
+	}()
+
+	upstream := &url.URL{Scheme: "http", Host: net.JoinHostPort("127.0.0.1", strconv.Itoa(inner))}
+	// The workflows' progress, heard on ComfyUI's websocket under an id of
+	// the gate's own.
+	book := newProgressBook()
+	cid := make([]byte, 8)
+	_, _ = rand.Read(cid)
+	clientID := "llmgw-gate-" + hex.EncodeToString(cid)
+	go book.watch(ctx, upstream, clientID, log)
+	srv := &http.Server{
+		Addr:              cfg.Listen,
+		Handler:           newGate(upstream, cfg.Key, names, book, clientID),
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+	served := make(chan error, 1)
+	go func() { served <- srv.ListenAndServe() }()
+	log.Info("ComfyUI gate up", "listen", cfg.Listen, "comfyui", upstream.Host, "weights", cfg.Weights)
+
+	stop := func() {
+		_ = child.Process.Signal(syscall.SIGTERM)
+		select {
+		case <-exited:
+		case <-time.After(20 * time.Second):
+			_ = child.Process.Kill()
+			<-exited
+		}
+	}
+	select {
+	case <-ctx.Done():
+		shutdown(srv)
+		stop()
+		return nil
+	case err := <-exited:
+		shutdown(srv)
+		if err == nil {
+			err = errors.New("exited")
+		}
+		return fmt.Errorf("ComfyUI %w", err)
+	case err := <-served:
+		stop()
+		return fmt.Errorf("the gate stopped serving: %w", err)
+	}
+}
+
+func shutdown(srv *http.Server) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	_ = srv.Shutdown(ctx)
+}
+
+// NewGate is the gate's handler, in front of the ComfyUI at upstream.
+func NewGate(upstream *url.URL, key, model string) http.Handler {
+	return newGate(upstream, key, []string{model}, newProgressBook(), "")
+}
+
+// newGate is the gate with the book of its workflows' progress, kept under
+// clientID; an empty one leaves the workflows' own client ids alone.
+func newGate(upstream *url.URL, key string, names []string, book *progressBook, clientID string) http.Handler {
+	proxy := httputil.NewSingleHostReverseProxy(upstream)
+	base := proxy.Director
+	proxy.Director = func(r *http.Request) {
+		base(r)
+		r.Header.Del("Authorization")
+		// ComfyUI refuses a request whose Origin is not its own host; the
+		// router sends none, and nothing else gets this far.
+		r.Header.Del("Origin")
+		r.Host = upstream.Host
+	}
+	client := &http.Client{Timeout: 3 * time.Second}
+	up := func(ctx context.Context) error {
+		req, _ := http.NewRequestWithContext(ctx, http.MethodGet, upstream.String()+"/system_stats", nil)
+		resp, err := client.Do(req)
+		if err != nil {
+			return err
+		}
+		resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			return fmt.Errorf("ComfyUI answered %s", resp.Status)
+		}
+		return nil
+	}
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if key != "" {
+			got, ok := strings.CutPrefix(r.Header.Get("Authorization"), "Bearer ")
+			if !ok || subtle.ConstantTimeCompare([]byte(got), []byte(key)) != 1 {
+				http.Error(w, "this engine wants its key", http.StatusUnauthorized)
+				return
+			}
+		}
+		switch r.URL.Path {
+		case "/health":
+			if err := up(r.Context()); err != nil {
+				http.Error(w, "ComfyUI is not up yet: "+err.Error(), http.StatusServiceUnavailable)
+				return
+			}
+			w.WriteHeader(http.StatusOK)
+			return
+		case "/v1/models":
+			if err := up(r.Context()); err != nil {
+				http.Error(w, "ComfyUI is not up yet: "+err.Error(), http.StatusServiceUnavailable)
+				return
+			}
+			w.Header().Set("Content-Type", "application/json")
+			data := make([]map[string]string, 0, len(names))
+			for _, n := range names {
+				data = append(data, map[string]string{"id": n, "object": "model", "owned_by": "comfyui"})
+			}
+			_ = json.NewEncoder(w).Encode(map[string]any{"object": "list", "data": data})
+			return
+		}
+		if id, ok := strings.CutPrefix(r.URL.Path, "/progress/"); ok && r.Method == http.MethodGet {
+			p, found := book.get(id)
+			if !found {
+				http.Error(w, "no word of that workflow", http.StatusNotFound)
+				return
+			}
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(p)
+			return
+		}
+		if r.URL.Path == "/prompt" && r.Method == http.MethodPost && clientID != "" {
+			book.promptThroughGate(proxy, clientID)(w, r)
+			return
+		}
+		for _, p := range gatePaths {
+			if r.URL.Path == p || strings.HasSuffix(p, "/") && strings.HasPrefix(r.URL.Path, p) {
+				proxy.ServeHTTP(w, r)
+				return
+			}
+		}
+		http.NotFound(w, r)
+	})
+}
+
+// cachedName is a file the agent fetched by itself: its cache names it by
+// the source's hash, then the name it had.
+var cachedName = regexp.MustCompile(`^[0-9a-f]{16}-`)
+
+// FileName is what a weights file is called where ComfyUI sees it: its own
+// name, without the prefix the agent's cache gives it.
+func FileName(path string) string {
+	return cachedName.ReplaceAllString(filepath.Base(path), "")
+}
+
+// SharedModelsEnv is where the agent hands a shared replica's gate its
+// members: name, the path their weights were fetched to, and the repository
+// a node loads them by name from.
+const SharedModelsEnv = "LLMGW_COMFYUI_MODELS"
+
+// sharedModel is one member of a shared replica.
+type sharedModel struct {
+	Name   string `json:"name"`
+	Path   string `json:"path"`
+	HFRepo string `json:"hf_repo"`
+}
+
+func parseShared(raw string) ([]sharedModel, error) {
+	if strings.TrimSpace(raw) == "" {
+		return nil, nil
+	}
+	var ms []sharedModel
+	if err := json.Unmarshal([]byte(raw), &ms); err != nil {
+		return nil, fmt.Errorf("%s: %w", SharedModelsEnv, err)
+	}
+	for _, m := range ms {
+		if m.Name == "" || m.Path == "" {
+			return nil, fmt.Errorf("%s: a member with no name or no fetched path", SharedModelsEnv)
+		}
+	}
+	return ms, nil
+}
+
+// LinkAllWeights shows ComfyUI every model's weights at once, for a replica
+// that answers for several: links made before are taken away first, then
+// each file of each is linked by its name. Two weights files of one name
+// are refused — ComfyUI would load one for both; anything else of one name
+// (a README, a licence) the first keeps.
+func LinkAllWeights(weights []string, dir string) error {
+	if len(weights) == 1 {
+		return LinkWeights(weights[0], dir)
+	}
+	if err := LinkWeights(weights[0], dir); err != nil {
+		return err
+	}
+	for _, w := range weights[1:] {
+		files, err := weightFiles(w)
+		if err != nil {
+			return err
+		}
+		for _, f := range files {
+			link := filepath.Join(dir, FileName(f))
+			if cur, err := os.Readlink(link); err == nil {
+				if cur == f {
+					continue
+				}
+				if isWeightsFile(f) {
+					return fmt.Errorf("two models' weights are both named %s (%s and %s): give one comfyui.checkpoint of another name",
+						FileName(f), cur, f)
+				}
+				continue
+			}
+			if err := os.Symlink(f, link); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// weightFiles are the files a weights source is: itself, or each of its
+// directory's.
+func weightFiles(weights string) ([]string, error) {
+	weights, err := filepath.Abs(weights)
+	if err != nil {
+		return nil, err
+	}
+	info, err := os.Stat(weights)
+	if err != nil {
+		return nil, fmt.Errorf("the weights: %w", err)
+	}
+	if !info.IsDir() {
+		return []string{weights}, nil
+	}
+	entries, err := os.ReadDir(weights)
+	if err != nil {
+		return nil, err
+	}
+	var out []string
+	for _, e := range entries {
+		if e.Type().IsRegular() && !strings.HasPrefix(e.Name(), ".") {
+			out = append(out, filepath.Join(weights, e.Name()))
+		}
+	}
+	return out, nil
+}
+
+func isWeightsFile(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".safetensors", ".ckpt", ".pt", ".pth", ".bin", ".gguf", ".sft":
+		return true
+	}
+	return false
+}
+
+// LinkWeights shows ComfyUI the weights: a link in dir to the file, or to
+// every file of the directory. Links made before are taken away first, so
+// a replica started again on other weights sees only those.
+func LinkWeights(weights, dir string) error {
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	old, err := os.ReadDir(dir)
+	if err != nil {
+		return err
+	}
+	for _, e := range old {
+		if e.Type()&os.ModeSymlink != 0 {
+			_ = os.Remove(filepath.Join(dir, e.Name()))
+		}
+	}
+	weights, err = filepath.Abs(weights)
+	if err != nil {
+		return err
+	}
+	info, err := os.Stat(weights)
+	if err != nil {
+		return fmt.Errorf("the weights: %w", err)
+	}
+	files := []string{weights}
+	if info.IsDir() {
+		entries, err := os.ReadDir(weights)
+		if err != nil {
+			return err
+		}
+		files = files[:0]
+		for _, e := range entries {
+			if e.Type().IsRegular() && !strings.HasPrefix(e.Name(), ".") {
+				files = append(files, filepath.Join(weights, e.Name()))
+			}
+		}
+		if len(files) == 0 {
+			return fmt.Errorf("the weights directory %s has no files", weights)
+		}
+	}
+	for _, f := range files {
+		if err := os.Symlink(f, filepath.Join(dir, FileName(f))); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func extraModelPaths(models string) string {
+	var b strings.Builder
+	fmt.Fprintf(&b, "llmgw:\n  base_path: %q\n  is_default: true\n", models)
+	for _, f := range modelFolders {
+		fmt.Fprintf(&b, "  %s: .\n", f)
+	}
+	return b.String()
+}
+
+func freePort() (int, error) {
+	l, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		return 0, err
+	}
+	defer l.Close()
+	return l.Addr().(*net.TCPAddr).Port, nil
+}
+
+// relay copies r to w for as long as r has anything, and goes on reading
+// after w fails: a writer that stops reading must not stop the one writing.
+func relay(r io.Reader, w io.Writer) {
+	buf := make([]byte, 32<<10)
+	broken := false
+	for {
+		n, err := r.Read(buf)
+		if n > 0 && !broken {
+			if _, werr := w.Write(buf[:n]); werr != nil {
+				broken = true
+			}
+		}
+		if err != nil {
+			return
+		}
+	}
+}
+
+// HFRepoEnv is where the agent hands the gate the repository a custom node
+// loads the weights by name from.
+const HFRepoEnv = "LLMGW_COMFYUI_HF_REPO"
+
+// hfHubDir is the Hugging Face cache of the user the gate runs as.
+func hfHubDir() string {
+	if d := os.Getenv("HF_HUB_CACHE"); d != "" {
+		return d
+	}
+	if d := os.Getenv("HF_HOME"); d != "" {
+		return filepath.Join(d, "hub")
+	}
+	home, _ := os.UserHomeDir()
+	return filepath.Join(home, ".cache", "huggingface", "hub")
+}
+
+// LinkHFCache shows the weights to a node that loads them by repository
+// name: a snapshot of repo in the Hugging Face cache at hub, each file a link
+// to the weights, refs/main naming it. huggingface_hub then answers from the
+// cache, and a gated repository needs no token on the node.
+func LinkHFCache(weights, repo, hub string) error {
+	owner, name, ok := strings.Cut(repo, "/")
+	if !ok || owner == "" || name == "" || strings.Contains(name, "/") || strings.Contains(repo, "..") || strings.Contains(repo, "\\") {
+		return fmt.Errorf("%q is not owner/name", repo)
+	}
+	weights, err := filepath.Abs(weights)
+	if err != nil {
+		return err
+	}
+	// The snapshot is named as a commit is, which is what refs/main must
+	// hold, and by the weights, so other weights are another snapshot.
+	sum := sha1.Sum([]byte(weights)) //nolint:gosec // a name, not a secret
+	revision := hex.EncodeToString(sum[:])
+	info, err := os.Stat(weights)
+	if err != nil {
+		return err
+	}
+	files := []string{weights}
+	if info.IsDir() {
+		entries, err := os.ReadDir(weights)
+		if err != nil {
+			return err
+		}
+		files = files[:0]
+		for _, e := range entries {
+			if !e.IsDir() && !strings.HasPrefix(e.Name(), ".") {
+				files = append(files, filepath.Join(weights, e.Name()))
+			}
+		}
+	}
+	root := filepath.Join(hub, "models--"+owner+"--"+name)
+	snap := filepath.Join(root, "snapshots", revision)
+	// Made again each time: links to weights that moved must not stay.
+	_ = os.RemoveAll(snap)
+	if err := os.MkdirAll(snap, 0o755); err != nil {
+		return err
+	}
+	for _, f := range files {
+		if err := os.Symlink(f, filepath.Join(snap, FileName(f))); err != nil {
+			return err
+		}
+	}
+	if err := os.MkdirAll(filepath.Join(root, "refs"), 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(filepath.Join(root, "refs", "main"), []byte(revision), 0o644) //nolint:gosec // not secret
+}

internal/comfy/gate_test.go

@@ -0,0 +1,301 @@
+package comfy
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestTheGateWantsTheKeyAndLetsThroughOnlyTheRoutersRequests(t *testing.T) {
+	var got []string
+	comfy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		got = append(got, r.Method+" "+r.URL.Path+" auth="+r.Header.Get("Authorization"))
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer comfy.Close()
+	u, _ := url.Parse(comfy.URL)
+	gate := httptest.NewServer(NewGate(u, "k", "flux"))
+	defer gate.Close()
+
+	do := func(method, path, key string) (int, string) {
+		req, _ := http.NewRequest(method, gate.URL+path, strings.NewReader("{}"))
+		if key != "" {
+			req.Header.Set("Authorization", "Bearer "+key)
+		}
+		resp, err := http.DefaultClient.Do(req)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer resp.Body.Close()
+		b, _ := io.ReadAll(resp.Body)
+		return resp.StatusCode, string(b)
+	}
+	if code, _ := do("POST", "/prompt", ""); code != http.StatusUnauthorized {
+		t.Errorf("no key: %d", code)
+	}
+	if code, _ := do("POST", "/prompt", "wrong"); code != http.StatusUnauthorized {
+		t.Errorf("wrong key: %d", code)
+	}
+	for _, p := range []string{"/upload/mask", "/api/manager/queue/install", "/userdata/x", "/internal/logs"} {
+		if code, _ := do("POST", p, "k"); code != http.StatusNotFound {
+			t.Errorf("%s: %d, want it refused", p, code)
+		}
+	}
+	for _, p := range []string{"/prompt", "/history/p1", "/view?filename=a.png", "/queue", "/interrupt", "/upload/image"} {
+		if code, _ := do("POST", p, "k"); code != http.StatusOK {
+			t.Errorf("%s: %d", p, code)
+		}
+	}
+	if code, body := do("GET", "/v1/models", "k"); code != 200 || !strings.Contains(body, `"id":"flux"`) {
+		t.Errorf("/v1/models: %d %s", code, body)
+	}
+	if code, _ := do("GET", "/health", "k"); code != 200 {
+		t.Errorf("/health: %d", code)
+	}
+	for _, g := range got {
+		if strings.Contains(g, "auth=Bearer") {
+			t.Errorf("the key reached ComfyUI: %s", g)
+		}
+	}
+	comfy.Close()
+	if code, _ := do("GET", "/health", "k"); code != http.StatusServiceUnavailable {
+		t.Errorf("/health with ComfyUI down: %d", code)
+	}
+}
+
+func TestTheWeightsAreShownByTheirOwnNames(t *testing.T) {
+	cache := t.TempDir()
+	one := filepath.Join(cache, "0123456789abcdef-flux1-schnell-fp8.safetensors")
+	_ = os.WriteFile(one, []byte("w"), 0o644)
+	models := filepath.Join(t.TempDir(), "models")
+	if err := LinkWeights(one, models); err != nil {
+		t.Fatal(err)
+	}
+	if target, err := os.Readlink(filepath.Join(models, "flux1-schnell-fp8.safetensors")); err != nil || target != one {
+		t.Fatalf("%q %v", target, err)
+	}
+
+	set := t.TempDir()
+	for _, n := range []string{"flux1-dev.safetensors", "ae.safetensors", "t5xxl_fp8.safetensors", ".complete"} {
+		_ = os.WriteFile(filepath.Join(set, n), []byte("w"), 0o644)
+	}
+	if err := LinkWeights(set, models); err != nil {
+		t.Fatal(err)
+	}
+	entries, _ := os.ReadDir(models)
+	var names []string
+	for _, e := range entries {
+		names = append(names, e.Name())
+	}
+	if strings.Join(names, ",") != "ae.safetensors,flux1-dev.safetensors,t5xxl_fp8.safetensors" {
+		t.Errorf("shown %v: the old weights' link should be gone and the marker not shown", names)
+	}
+	if !strings.Contains(extraModelPaths(models), "checkpoints: .") {
+		t.Error(extraModelPaths(models))
+	}
+}
+
+// TestMain lets the test binary stand in for ComfyUI: started by the gate
+// as `python main.py --listen … --port …`, it answers /system_stats and
+// says what it was given.
+func TestMain(m *testing.M) {
+	if os.Getenv("LLMGW_FAKE_COMFYUI") == "1" {
+		fakeComfyUI()
+		return
+	}
+	os.Exit(m.Run())
+}
+
+func fakeComfyUI() {
+	var port, base string
+	for i, a := range os.Args {
+		switch a {
+		case "--port":
+			port = os.Args[i+1]
+		case "--base-directory":
+			base = os.Args[i+1]
+		}
+	}
+	_ = os.WriteFile(filepath.Join(base, "args"), []byte(strings.Join(os.Args[1:], " ")+"\nkey="+os.Getenv("LLMGW_ENGINE_KEY")), 0o644)
+	http.HandleFunc("/system_stats", func(w http.ResponseWriter, _ *http.Request) {
+		// A progress bar's worth of output with every answer: a write that
+		// failed would end this process, as it fails ComfyUI's workflow.
+		if _, err := os.Stdout.Write([]byte(strings.Repeat("progress ", 20000) + "\n")); err != nil {
+			os.Exit(4)
+		}
+		_, _ = io.WriteString(w, "{}")
+	})
+	http.HandleFunc("/quit", func(w http.ResponseWriter, _ *http.Request) { os.Exit(3) })
+	if os.Getenv("LLMGW_FAKE_COMFYUI_EXIT") == "1" {
+		time.AfterFunc(200*time.Millisecond, func() { os.Exit(3) })
+	}
+	_ = http.ListenAndServe("127.0.0.1:"+port, nil)
+}
+
+func TestTheGateRunsComfyUIAndEndsWithIt(t *testing.T) {
+	t.Setenv("LLMGW_FAKE_COMFYUI", "1")
+	weights := filepath.Join(t.TempDir(), "flux.safetensors")
+	_ = os.WriteFile(weights, []byte("w"), 0o644)
+	state := t.TempDir()
+	l, _ := net.Listen("tcp", "127.0.0.1:0")
+	listen := l.Addr().String()
+	l.Close()
+
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+	done := make(chan error, 1)
+	go func() {
+		done <- RunGate(ctx, GateConfig{Listen: listen, Model: "flux", Weights: weights, State: state,
+			Python: os.Args[0], Dir: t.TempDir(), Args: []string{"--disable-smart-memory"}, Output: io.Discard})
+	}()
+	get := func(path string) int {
+		resp, err := http.Get("http://" + listen + path)
+		if err != nil {
+			return 0
+		}
+		resp.Body.Close()
+		return resp.StatusCode
+	}
+	deadline := time.Now().Add(10 * time.Second)
+	for get("/health") != http.StatusOK {
+		if time.Now().After(deadline) {
+			t.Fatal("the gate never said ComfyUI was up")
+		}
+		time.Sleep(20 * time.Millisecond)
+	}
+	b, _ := os.ReadFile(filepath.Join(state, "args"))
+	for _, want := range []string{"main.py --listen 127.0.0.1 --port", "--base-directory " + state,
+		"--extra-model-paths-config " + filepath.Join(state, "extra_model_paths.yaml"), "--disable-smart-memory"} {
+		if !strings.Contains(string(b), want) {
+			t.Errorf("%q not in what ComfyUI was given: %s", want, b)
+		}
+	}
+	if _, err := os.Lstat(filepath.Join(state, "models", "flux.safetensors")); err != nil {
+		t.Error("the weights were not shown to ComfyUI:", err)
+	}
+	if _, err := os.Stat(filepath.Join(state, "custom_nodes")); err != nil {
+		t.Error("ComfyUI lists custom_nodes in its base directory first thing, and it is not there:", err)
+	}
+	if get("/quit") != http.StatusNotFound {
+		t.Error("a path the router never asks for was let through")
+	}
+	cancel()
+	select {
+	case err := <-done:
+		if err != nil {
+			t.Errorf("stopped, the gate said %v", err)
+		}
+	case <-time.After(25 * time.Second):
+		t.Fatal("the gate did not stop")
+	}
+}
+
+func TestComfyUIExitingEndsTheGate(t *testing.T) {
+	t.Setenv("LLMGW_FAKE_COMFYUI", "1")
+	t.Setenv("LLMGW_FAKE_COMFYUI_EXIT", "1")
+	weights := filepath.Join(t.TempDir(), "w.safetensors")
+	_ = os.WriteFile(weights, []byte("w"), 0o644)
+	err := RunGate(t.Context(), GateConfig{Listen: "127.0.0.1:0", Weights: weights, State: t.TempDir(),
+		Python: os.Args[0], Dir: t.TempDir(), Output: io.Discard})
+	if err == nil || !strings.Contains(err.Error(), "exit status 3") {
+		t.Fatalf("err = %v", err)
+	}
+}
+
+type brokenWriter struct{}
+
+func (brokenWriter) Write([]byte) (int, error) { return 0, errors.New("broken pipe") }
+
+func TestComfyUIKeepsWritingWhenWhatTheGateWritesToIsGone(t *testing.T) {
+	t.Setenv("LLMGW_FAKE_COMFYUI", "1")
+	weights := filepath.Join(t.TempDir(), "w.safetensors")
+	_ = os.WriteFile(weights, []byte("w"), 0o644)
+	l, _ := net.Listen("tcp", "127.0.0.1:0")
+	listen := l.Addr().String()
+	l.Close()
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+	done := make(chan error, 1)
+	go func() {
+		done <- RunGate(ctx, GateConfig{Listen: listen, Weights: weights, State: t.TempDir(),
+			Python: os.Args[0], Dir: t.TempDir(), Output: brokenWriter{}})
+	}()
+	ok := 0
+	deadline := time.Now().Add(10 * time.Second)
+	for ok < 20 && time.Now().Before(deadline) {
+		resp, err := http.Get("http://" + listen + "/health")
+		if err == nil {
+			if resp.StatusCode == http.StatusOK {
+				ok++
+			}
+			resp.Body.Close()
+		}
+		select {
+		case err := <-done:
+			t.Fatalf("the gate ended: %v", err)
+		default:
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+	if ok < 20 {
+		t.Fatalf("ComfyUI answered %d times; output it could not hand on stopped it", ok)
+	}
+}
+
+func TestLLMGWsOwnNodesArePutInEveryReplica(t *testing.T) {
+	state := t.TempDir()
+	if err := installOwnNodes(state); err != nil {
+		t.Fatal(err)
+	}
+	b, err := os.ReadFile(filepath.Join(state, "custom_nodes", "llmgw_nodes", "__init__.py"))
+	if err != nil || !strings.Contains(string(b), "LLMGWPrepareForMesh") {
+		t.Fatalf("%v %.80s", err, b)
+	}
+}
+
+func TestASharedReplicaSeesEveryMembersWeights(t *testing.T) {
+	root := t.TempDir()
+	write := func(p string) string {
+		full := filepath.Join(root, p)
+		_ = os.MkdirAll(filepath.Dir(full), 0o755)
+		if err := os.WriteFile(full, []byte("w"), 0o644); err != nil {
+			t.Fatal(err)
+		}
+		return full
+	}
+	flux := write("flux1-schnell-fp8.safetensors")
+	write("sf3d/model.safetensors")
+	write("sf3d/README.md")
+	write("tripo/model.ckpt")
+	write("tripo/README.md")
+	dir := filepath.Join(root, "models")
+	if err := LinkAllWeights([]string{flux, filepath.Join(root, "sf3d"), filepath.Join(root, "tripo")}, dir); err != nil {
+		t.Fatal(err)
+	}
+	for _, want := range []string{"flux1-schnell-fp8.safetensors", "model.safetensors", "model.ckpt", "README.md"} {
+		if _, err := os.Lstat(filepath.Join(dir, want)); err != nil {
+			t.Errorf("%s not linked: %v", want, err)
+		}
+	}
+	// Two weights of one name: ComfyUI would load one for both.
+	write("other/model.safetensors")
+	err := LinkAllWeights([]string{filepath.Join(root, "sf3d"), filepath.Join(root, "other")}, dir)
+	if err == nil || !strings.Contains(err.Error(), "both named model.safetensors") {
+		t.Errorf("err %v", err)
+	}
+	if ms, err := parseShared(`[{"name":"sf3d","path":"/x","hf_repo":"stabilityai/stable-fast-3d"}]`); err != nil || ms[0].HFRepo == "" {
+		t.Errorf("parse %+v %v", ms, err)
+	}
+	if _, err := parseShared(`[{"name":"sf3d"}]`); err == nil {
+		t.Error("a member with no path was taken")
+	}
+}

internal/comfy/nodes.go

@@ -0,0 +1,334 @@
+package comfy
+
+import (
+	"context"
+	"embed"
+	"encoding/json"
+	"fmt"
+	"io/fs"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"slices"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Custom nodes, put in a replica's own base directory at the commit the
+// catalog names, their packages installed beside the replica rather than
+// into ComfyUI's environment: one model's node cannot break another
+// model's replicas, or the pictures every replica makes.
+
+// Node is a custom node as the catalog gives it.
+type Node struct {
+	Repo         string   `json:"repo"`
+	Commit       string   `json:"commit"`
+	Requirements []string `json:"requirements,omitempty"`
+	// Build are directories of the node that are packages to compile.
+	Build []string `json:"build,omitempty"`
+}
+
+//go:embed all:nodes
+var ownNodes embed.FS
+
+// installOwnNodes writes llmgw's own nodes into a replica's custom_nodes:
+// what every workflow may use, from the binary rather than a repository,
+// written again at every start so a replica runs the gate's own version.
+func installOwnNodes(state string) error {
+	return fs.WalkDir(ownNodes, "nodes", func(p string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		dst := filepath.Join(state, "custom_nodes", strings.TrimPrefix(p, "nodes"))
+		if d.IsDir() {
+			return os.MkdirAll(dst, 0o755)
+		}
+		b, err := ownNodes.ReadFile(p)
+		if err != nil {
+			return err
+		}
+		return os.WriteFile(dst, b, 0o644) //nolint:gosec // code ComfyUI reads, not secret
+	})
+}
+
+// NodesEnv is where the agent hands the gate a model's custom nodes.
+const NodesEnv = "LLMGW_COMFYUI_NODES"
+
+var nodeDir = regexp.MustCompile(`[^A-Za-z0-9._-]`)
+
+// installNodes puts each node in state/custom_nodes at its commit and its
+// packages in state/site, and returns the PYTHONPATH ComfyUI is started
+// with: empty when no node wants a package. Run as the engines' user, in
+// the replica's own directory, before ComfyUI starts.
+func installNodes(ctx context.Context, state, python string, nodes []Node, uv string, out func(string)) (string, error) {
+	if len(nodes) == 0 {
+		return "", nil
+	}
+	ctx, cancel := context.WithTimeout(ctx, 20*time.Minute)
+	defer cancel()
+	var reqs, built []string
+	for _, n := range nodes {
+		name := nodeDir.ReplaceAllString(strings.TrimSuffix(path.Base(n.Repo), ".git"), "_")
+		dir := filepath.Join(state, "custom_nodes", name)
+		if head, err := gitOutput(ctx, dir, "rev-parse", "HEAD"); err == nil && head == n.Commit {
+			reqs = append(reqs, n.Requirements...)
+			wheels, err := buildNode(ctx, n, dir, python, uv, out)
+			if err != nil {
+				return "", err
+			}
+			built = append(built, wheels...)
+			continue
+		}
+		out(fmt.Sprintf("custom node %s at %s", n.Repo, n.Commit[:12]))
+		_ = os.RemoveAll(dir)
+		for _, args := range [][]string{
+			{"init", "-q", dir},
+			{"-C", dir, "remote", "add", "origin", n.Repo},
+			{"-C", dir, "fetch", "-q", "--depth", "1", "origin", n.Commit},
+			{"-C", dir, "checkout", "-q", "FETCH_HEAD"},
+		} {
+			if b, err := exec.CommandContext(ctx, "git", args...).CombinedOutput(); err != nil { //nolint:gosec // the catalog's repository, checked as https
+				return "", fmt.Errorf("custom node %s at %s: git %s: %v: %s", n.Repo, n.Commit, args[len(args)-2], err, lastLines(b))
+			}
+		}
+		reqs = append(reqs, n.Requirements...)
+		wheels, err := buildNode(ctx, n, dir, python, uv, out)
+		if err != nil {
+			return "", err
+		}
+		built = append(built, wheels...)
+	}
+	if len(reqs) == 0 && len(built) == 0 {
+		return "", nil
+	}
+	if uv == "" {
+		return "", fmt.Errorf("custom nodes need %s, and no uv is installed to install them with", strings.Join(reqs, ", "))
+	}
+	// A built package is named by its wheel; ComfyUI's own copy, if one was
+	// ever put there, must not pin it to another.
+	named := slices.Clone(reqs)
+	for _, w := range built {
+		named = append(named, wheelPackage(w))
+	}
+	reqs = append(reqs, built...)
+	site := filepath.Join(state, "site")
+	marker := filepath.Join(site, ".llmgw-requirements")
+	want := strings.Join(reqs, "\n")
+	if b, err := os.ReadFile(marker); err == nil && string(b) == want {
+		return site, nil
+	}
+	out("installing " + strings.Join(reqs, " ") + " for the custom nodes")
+	// What ComfyUI's environment has, as constraints: a package both want is
+	// installed at the version ComfyUI runs, so the replica's copy and
+	// ComfyUI's never disagree.
+	freeze, err := exec.CommandContext(ctx, uv, "pip", "freeze", "--python", python).Output() //nolint:gosec // the agent's own uv
+	if err != nil {
+		return "", fmt.Errorf("reading ComfyUI's packages: %w", err)
+	}
+	constraints := filepath.Join(state, "constraints.txt")
+	if err := os.WriteFile(constraints, withoutNamed(freeze, named), 0o644); err != nil { //nolint:gosec // not secret
+		return "", err
+	}
+	_ = os.RemoveAll(site)
+	args := append([]string{"pip", "install", "--python", python, "--target", site, "-c", constraints, "--quiet"}, reqs...)
+	cmd := exec.CommandContext(ctx, uv, args...) //nolint:gosec // requirements checked by the catalog as package specs
+	cmd.Env = append(os.Environ(), "UV_NO_CONFIG=1", "UV_CACHE_DIR="+filepath.Join(state, ".uv-cache"))
+	if b, err := cmd.CombinedOutput(); err != nil {
+		return "", fmt.Errorf("installing the custom nodes' packages (%s): %v: %s", strings.Join(reqs, " "), err, lastLines(b))
+	}
+	// The replica's copies come first on ComfyUI's path, but of anything
+	// both have they are the same version, so which is found is the same.
+	if err := os.WriteFile(marker, []byte(want), 0o644); err != nil { //nolint:gosec // not secret
+		return "", err
+	}
+	return site, nil
+}
+
+// parseNodes reads the nodes the agent handed over.
+func parseNodes(s string) ([]Node, error) {
+	if strings.TrimSpace(s) == "" {
+		return nil, nil
+	}
+	var nodes []Node
+	if err := json.Unmarshal([]byte(s), &nodes); err != nil {
+		return nil, fmt.Errorf("%s: %w", NodesEnv, err)
+	}
+	return nodes, nil
+}
+
+// findUV is the uv the agent installed engines with.
+func findUV() string {
+	if m, _ := filepath.Glob("/opt/llmgw/engines/uv/*/*/uv"); len(m) > 0 {
+		return m[len(m)-1]
+	}
+	if p, err := exec.LookPath("uv"); err == nil {
+		return p
+	}
+	return ""
+}
+
+func gitOutput(ctx context.Context, dir string, args ...string) (string, error) {
+	b, err := exec.CommandContext(ctx, "git", append([]string{"-C", dir}, args...)...).Output() //nolint:gosec // fixed arguments
+	return strings.TrimSpace(string(b)), err
+}
+
+func lastLines(b []byte) string {
+	lines := strings.Split(strings.TrimSpace(string(b)), "\n")
+	if len(lines) > 4 {
+		lines = lines[len(lines)-4:]
+	}
+	return strings.Join(lines, " | ")
+}
+
+// withoutNamed is ComfyUI's packages less those a node names itself: of a
+// package a node asks for by name, the node's range decides — TripoSR's
+// checkpoint loads with transformers 4 and not 5 — and of everything else,
+// what ComfyUI runs. A node that names a package must name a range ComfyUI
+// can run with too: the copy it gets is first on ComfyUI's path.
+func withoutNamed(freeze []byte, reqs []string) []byte {
+	named := map[string]bool{}
+	for _, r := range reqs {
+		named[packageName(r)] = true
+	}
+	var out []string
+	for _, line := range strings.Split(string(freeze), "\n") {
+		if strings.TrimSpace(line) == "" || named[packageName(line)] {
+			continue
+		}
+		out = append(out, line)
+	}
+	return []byte(strings.Join(out, "\n") + "\n")
+}
+
+// packageName is a requirement's package, as PyPI compares them.
+func packageName(spec string) string {
+	s := strings.TrimSpace(spec)
+	if i := strings.IndexAny(s, "<>=!~;[ @"); i >= 0 {
+		s = s[:i]
+	}
+	return strings.NewReplacer("_", "-", ".", "-").Replace(strings.ToLower(s))
+}
+
+// Packages a node's repository has that no index does — C++ and CUDA
+// extensions — are built here, for the card the replica runs on: a CUDA
+// kernel compiled for one architecture does not load on another, and a
+// site's cards are not the PoC's. A build is minutes; its wheel is kept on
+// the node, by the node's commit, the directory and the architecture, for
+// the next replica on the same kind of card.
+
+// cudaArch is the compute capability of the card the replica sees, as
+// TORCH_CUDA_ARCH_LIST wants it ("7.5"). A var for the tests.
+var cudaArch = func(ctx context.Context, python string) (string, error) {
+	cmd := exec.CommandContext(ctx, python, "-c", //nolint:gosec // the agent's own Python
+		"import torch; print('%d.%d' % torch.cuda.get_device_capability())")
+	b, err := cmd.Output()
+	if err != nil {
+		return "", fmt.Errorf("asking torch for the card's compute capability: %v", err)
+	}
+	return strings.TrimSpace(string(b)), nil
+}
+
+// buildWheel builds the package in dir as a wheel into outDir, with
+// ComfyUI's Python and what it already has (torch, setuptools): a CUDA
+// extension builds against the torch it will load with. A var for the tests.
+var buildWheel = func(ctx context.Context, uv, python, dir, outDir string, env []string) ([]byte, error) {
+	cmd := exec.CommandContext(ctx, uv, "build", "--wheel", "--no-build-isolation", //nolint:gosec // the catalog's node, at its commit
+		"--python", python, "--out-dir", outDir, dir)
+	cmd.Env = env
+	return cmd.CombinedOutput()
+}
+
+// buildCache is where built wheels are kept: under the engines' home, which
+// outlives a replica.
+func buildCache() string {
+	if d, err := os.UserCacheDir(); err == nil {
+		return filepath.Join(d, "llmgw", "node-builds")
+	}
+	return filepath.Join(os.TempDir(), "llmgw-node-builds")
+}
+
+// buildNode builds each of a node's packages that are compiled, or finds the
+// wheel built before for this commit and card, and returns the wheels.
+func buildNode(ctx context.Context, n Node, dir, python, uv string, out func(string)) ([]string, error) {
+	if len(n.Build) == 0 {
+		return nil, nil
+	}
+	if uv == "" {
+		return nil, fmt.Errorf("custom node %s has packages to build, and no uv is installed to build them with", n.Repo)
+	}
+	arch, err := cudaArch(ctx, python)
+	if err != nil {
+		return nil, fmt.Errorf("custom node %s: %w", n.Repo, err)
+	}
+	cudaHome := os.Getenv("CUDA_HOME")
+	if cudaHome == "" {
+		for _, c := range []string{"/usr/local/cuda"} {
+			if _, err := os.Stat(filepath.Join(c, "bin", "nvcc")); err == nil {
+				cudaHome = c
+			}
+		}
+	}
+	var wheels []string
+	for _, sub := range n.Build {
+		cached := filepath.Join(buildCache(), n.Commit[:12], "sm"+strings.ReplaceAll(arch, ".", ""), nodeDir.ReplaceAllString(sub, "_"))
+		if w, ok := firstWheel(cached); ok {
+			wheels = append(wheels, w)
+			continue
+		}
+		if cudaHome == "" {
+			return nil, fmt.Errorf("custom node %s: %s is compiled, and this node has no CUDA toolkit (no nvcc in "+
+				"CUDA_HOME or /usr/local/cuda) to compile it with", n.Repo, sub)
+		}
+		out(fmt.Sprintf("building %s of %s for compute %s", sub, n.Repo, arch))
+		// Built beside where it is kept and moved there whole: two replicas
+		// starting at once on one node must not see half a wheel.
+		if err := os.MkdirAll(filepath.Dir(cached), 0o755); err != nil {
+			return nil, err
+		}
+		tmp, err := os.MkdirTemp(filepath.Dir(cached), ".build-")
+		if err != nil {
+			return nil, err
+		}
+		env := append(os.Environ(), "TORCH_CUDA_ARCH_LIST="+arch, "CUDA_HOME="+cudaHome,
+			"PATH="+filepath.Join(cudaHome, "bin")+string(os.PathListSeparator)+os.Getenv("PATH"),
+			"UV_NO_CONFIG=1", "MAX_JOBS="+strconv.Itoa(max(runtime.NumCPU(), 1)))
+		b, err := buildWheel(ctx, uv, python, filepath.Join(dir, sub), tmp, env)
+		if err != nil {
+			_ = os.RemoveAll(tmp)
+			return nil, fmt.Errorf("custom node %s: building %s: %v: %s", n.Repo, sub, err, lastLines(b))
+		}
+		if _, ok := firstWheel(tmp); !ok {
+			_ = os.RemoveAll(tmp)
+			return nil, fmt.Errorf("custom node %s: building %s made no wheel: %s", n.Repo, sub, lastLines(b))
+		}
+		if err := os.Rename(tmp, cached); err != nil {
+			_ = os.RemoveAll(tmp)
+			// Another replica got there first: its wheel is as good.
+			if _, ok := firstWheel(cached); !ok {
+				return nil, err
+			}
+		}
+		w, _ := firstWheel(cached)
+		wheels = append(wheels, w)
+	}
+	return wheels, nil
+}
+
+func firstWheel(dir string) (string, bool) {
+	m, _ := filepath.Glob(filepath.Join(dir, "*.whl"))
+	if len(m) == 0 {
+		return "", false
+	}
+	return m[0], true
+}
+
+// wheelPackage is the package a wheel file is of: its name up to the first
+// '-', as PyPI compares names.
+func wheelPackage(wheel string) string {
+	name, _, _ := strings.Cut(filepath.Base(wheel), "-")
+	return packageName(name)
+}

internal/comfy/nodes/llmgw_nodes/__init__.py

@@ -0,0 +1,183 @@
+"""llmgw's own ComfyUI nodes, put in every replica by the gate.
+
+LLMGWPrepareForMesh is what an image-to-3D model wants of its picture, as
+TripoSR's own pipeline (tsr/utils.py) does it: the background taken away —
+by the picture's alpha where it has one, by rembg (MIT; u2net, Apache 2.0)
+where it does not — the object cropped to its bounds, set square in the
+middle at a ratio of the side, on grey.
+"""
+
+import numpy as np
+import torch
+from PIL import Image
+
+_sessions = {}
+
+
+def _rembg(img, model):
+    try:
+        import rembg
+    except ImportError as e:  # a model that wants it names it in its nodes' requirements
+        raise RuntimeError("the picture has no alpha and rembg is not installed for this model: "
+                           "add rembg and onnxruntime to its custom node requirements") from e
+    if model not in _sessions:
+        _sessions[model] = rembg.new_session(model)
+    return rembg.remove(img, session=_sessions[model])
+
+
+def _fit(rgba, ratio):
+    """tsr.utils.resize_foreground: crop to the alpha's bounds, pad square,
+    pad again so the object is ratio of the side."""
+    a = np.array(rgba)
+    ys, xs = np.where(a[..., 3] > 0)
+    if len(ys) == 0:
+        raise RuntimeError("nothing is left of the picture once its background is taken away")
+    fg = a[ys.min():ys.max() + 1, xs.min():xs.max() + 1]
+    size = max(fg.shape[0], fg.shape[1])
+    ph0, pw0 = (size - fg.shape[0]) // 2, (size - fg.shape[1]) // 2
+    sq = np.pad(fg, ((ph0, size - fg.shape[0] - ph0), (pw0, size - fg.shape[1] - pw0), (0, 0)))
+    new = int(size / ratio)
+    ph0, pw0 = (new - size) // 2, (new - size) // 2
+    return np.pad(sq, ((ph0, new - size - ph0), (pw0, new - size - pw0), (0, 0)))
+
+
+class LLMGWPrepareForMesh:
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+                "foreground_ratio": ("FLOAT", {"default": 0.85, "min": 0.3, "max": 1.0, "step": 0.01}),
+                "background": ("FLOAT", {"default": 0.5, "min": 0.0, "max": 1.0, "step": 0.01}),
+                "remove_background": (["auto", "always", "never"],),
+                "rembg_model": (["u2net", "isnet-general-use", "u2netp"],),
+            },
+            "optional": {"mask": ("MASK",)},
+        }
+
+    RETURN_TYPES = ("IMAGE", "MASK")
+    RETURN_NAMES = ("image", "mask")
+    FUNCTION = "prepare"
+    CATEGORY = "llmgw"
+
+    def prepare(self, image, foreground_ratio, background, remove_background, rembg_model, mask=None):
+        out = []
+        for i in range(image.shape[0]):
+            rgb = (image[i].cpu().numpy() * 255).clip(0, 255).astype(np.uint8)
+            h, w = rgb.shape[:2]
+            alpha = None
+            # LoadImage's mask is 1 - alpha, and a 64x64 of zeros for a
+            # picture with none.
+            if mask is not None and remove_background != "always":
+                m = mask[min(i, mask.shape[0] - 1)].cpu().numpy()
+                if m.shape == (h, w) and m.max() > 0:
+                    alpha = ((1.0 - m) * 255).clip(0, 255).astype(np.uint8)
+            if alpha is None and remove_background != "never":
+                rgba = np.array(_rembg(Image.fromarray(rgb), rembg_model).convert("RGBA"))
+            else:
+                if alpha is None:
+                    alpha = np.full((h, w), 255, np.uint8)
+                rgba = np.dstack([rgb, alpha])
+            sq = _fit(rgba, foreground_ratio).astype(np.float32) / 255.0
+            a = sq[..., 3:4]
+            img = sq[..., :3] * a + (1.0 - a) * background
+            out.append(torch.from_numpy(np.dstack([img, a])))
+        # One size for the batch: the first picture's.
+        side = out[0].shape[0]
+        out = [o if o.shape[0] == side else torch.from_numpy(
+            np.array(Image.fromarray((o.numpy() * 255).astype(np.uint8)).resize((side, side)))).float() / 255.0
+            for o in out]
+        both = torch.stack(out)
+        # The picture on its background, and the object's alpha as a mask
+        # (1 where the object is) for a model that wants it, as Stable Fast
+        # 3D's sampler does.
+        return (both[..., :3].contiguous(), both[..., 3].contiguous())
+
+
+def _to_linear(x):
+    return np.where(x <= 0.04045, x / 12.92, ((x + 0.055) / 1.055) ** 2.4)
+
+
+def _to_srgb(x):
+    return np.where(x <= 0.0031308, x * 12.92, 1.055 * np.power(np.clip(x, 0, None), 1 / 2.4) - 0.055)
+
+
+def _match_albedo(tex, reference, mask):
+    """The texture's brightness brought to the picture's: Stable Fast 3D
+    takes the light out of what it sees, and a dark object it reads as a
+    light one dimly lit — a basalt of 0.17 came back 0.67. Scaled in linear
+    light by the ratio of the medians over the object, so its marks keep
+    their contrast; texels nothing maps to (black) are left as they are."""
+    t = np.asarray(tex.convert("RGB")).astype(np.float64) / 255.0
+    used = t.max(-1) > 2 / 255
+    ref = reference.cpu().numpy().astype(np.float64)
+    obj = mask.cpu().numpy() > 0.5 if mask is not None else np.ones(ref.shape[:2], bool)
+    if used.sum() < 16 or obj.sum() < 16:
+        return tex
+    lum = lambda a: a @ np.array([0.2126, 0.7152, 0.0722])
+    want = np.median(lum(_to_linear(ref[obj])))
+    have = np.median(lum(_to_linear(t[used])))
+    if have <= 0:
+        return tex
+    k = float(np.clip(want / have, 0.05, 20.0))
+    out = t.copy()
+    out[used] = np.clip(_to_srgb(_to_linear(t[used]) * k), 0, 1)
+    img = Image.fromarray((out * 255 + 0.5).astype(np.uint8))
+    img.format = tex.format
+    return img
+
+
+class LLMGWSaveMesh:
+    """Writes each mesh a 3D node made to output/ as a GLB and names the
+    files, which is how the gate finds a result. A model's own save node
+    may return the mesh as base64 (Stable Fast 3D's does) or as an OBJ
+    without its texture, and the gate reads neither.
+
+    With albedo_match and the picture the mesh was made from (and its
+    mask), the mesh's base colour is brought to the picture's brightness."""
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {"required": {"mesh": ("MESH",), "filename_prefix": ("STRING", {"default": "mesh"})},
+                "optional": {"albedo_match": ("BOOLEAN", {"default": False}),
+                             "reference": ("IMAGE",), "reference_mask": ("MASK",)}}
+
+    RETURN_TYPES = ()
+    OUTPUT_NODE = True
+    FUNCTION = "save"
+    CATEGORY = "llmgw"
+
+    def save(self, mesh, filename_prefix="mesh", albedo_match=False, reference=None, reference_mask=None):
+        import os
+        import folder_paths
+        import trimesh
+        from trimesh.exchange import gltf
+
+        folder, name, counter, subfolder, _ = folder_paths.get_save_image_path(
+            filename_prefix, folder_paths.get_output_directory())
+        saved = []
+        for i, m in enumerate(mesh if isinstance(mesh, (list, tuple)) else [mesh]):
+            if albedo_match and reference is not None:
+                _match_scene(m, reference[min(i, reference.shape[0] - 1)],
+                             None if reference_mask is None else reference_mask[min(i, reference_mask.shape[0] - 1)])
+            file = f"{name.replace('%batch_num%', str(i))}_{counter + i:05}_.glb"
+            scene = m if isinstance(m, trimesh.Scene) else trimesh.Scene(m)
+            with open(os.path.join(folder, file), "wb") as f:
+                f.write(gltf.export_glb(scene, include_normals=True))
+            saved.append({"filename": file, "type": "output", "subfolder": subfolder})
+        return {"ui": {"mesh": saved}}
+
+
+def _match_scene(m, reference, mask):
+    """_match_albedo on every base colour texture of a mesh or scene."""
+    geoms = m.geometry.values() if hasattr(m, "geometry") else [m]
+    for g in geoms:
+        mat = getattr(getattr(g, "visual", None), "material", None)
+        tex = getattr(mat, "baseColorTexture", None)
+        if tex is not None:
+            mat.baseColorTexture = _match_albedo(tex, reference, mask)
+
+
+NODE_CLASS_MAPPINGS = {"LLMGWPrepareForMesh": LLMGWPrepareForMesh, "LLMGWSaveMesh": LLMGWSaveMesh}
+NODE_DISPLAY_NAME_MAPPINGS = {"LLMGWPrepareForMesh": "Prepare a picture for a 3D model (llmgw)",
+                              "LLMGWSaveMesh": "Save a mesh as GLB (llmgw)"}

internal/comfy/nodes_test.go

@@ -0,0 +1,165 @@
+package comfy
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"sync/atomic"
+	"testing"
+)
+
+// fakeUV is a uv that answers pip freeze with ComfyUI's packages and records
+// what pip install was given.
+func fakeUV(t *testing.T, freeze string) (uv, log string) {
+	t.Helper()
+	dir := t.TempDir()
+	log = filepath.Join(dir, "install.log")
+	uv = filepath.Join(dir, "uv")
+	script := "#!/bin/sh\nif [ \"$2\" = freeze ]; then printf '%s' '" + freeze + "'; exit 0; fi\n" +
+		"echo \"$@\" >> " + log + "\n" +
+		"prev=; for a in \"$@\"; do if [ \"$prev\" = --target ]; then mkdir -p \"$a\"; fi; prev=$a; done\nexit 0\n"
+	if err := os.WriteFile(uv, []byte(script), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	return uv, log
+}
+
+func gitRepo(t *testing.T, files map[string]string) (repo, commit string) {
+	t.Helper()
+	if _, err := exec.LookPath("git"); err != nil {
+		t.Skip("no git")
+	}
+	repo = t.TempDir()
+	run := func(args ...string) string {
+		cmd := exec.Command("git", args...)
+		cmd.Dir = repo
+		cmd.Env = append(os.Environ(), "GIT_AUTHOR_NAME=t", "GIT_AUTHOR_EMAIL=t@t", "GIT_COMMITTER_NAME=t", "GIT_COMMITTER_EMAIL=t@t")
+		b, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Fatalf("git %v: %v %s", args, err, b)
+		}
+		return strings.TrimSpace(string(b))
+	}
+	run("init", "-q")
+	run("config", "uploadpack.allowReachableSHA1InWant", "true")
+	for name, body := range files {
+		_ = os.MkdirAll(filepath.Dir(filepath.Join(repo, name)), 0o755)
+		_ = os.WriteFile(filepath.Join(repo, name), []byte(body), 0o644)
+	}
+	run("add", ".")
+	run("commit", "-qm", "one")
+	return repo, run("rev-parse", "HEAD")
+}
+
+func TestANodesCompiledPackagesAreBuiltForTheCardOnceAndInstalledBesideTheReplica(t *testing.T) {
+	repo, commit := gitRepo(t, map[string]string{"__init__.py": "", "texture_baker/setup.py": "", "uv_unwrapper/setup.py": ""})
+	t.Setenv("XDG_CACHE_HOME", t.TempDir())
+	t.Setenv("HOME", t.TempDir())
+	cuda := t.TempDir()
+	_ = os.MkdirAll(filepath.Join(cuda, "bin"), 0o755)
+	_ = os.WriteFile(filepath.Join(cuda, "bin", "nvcc"), nil, 0o755)
+	t.Setenv("CUDA_HOME", cuda)
+
+	var builds atomic.Int32
+	var envSeen []string
+	oldArch, oldBuild := cudaArch, buildWheel
+	t.Cleanup(func() { cudaArch, buildWheel = oldArch, oldBuild })
+	cudaArch = func(context.Context, string) (string, error) { return "7.5", nil }
+	buildWheel = func(_ context.Context, _, _, dir, out string, env []string) ([]byte, error) {
+		builds.Add(1)
+		envSeen = env
+		name := strings.ReplaceAll(filepath.Base(dir), "_", "-")
+		return nil, os.WriteFile(filepath.Join(out, strings.ReplaceAll(name, "-", "_")+"-0.0.1-cp312-cp312-linux_x86_64.whl"), []byte("w"), 0o644)
+	}
+	// ComfyUI's environment has an old hand-installed copy, which must not
+	// pin the built one.
+	uv, log := fakeUV(t, "numpy==2.5.3\ntexture-baker @ file:///home/someone/texture_baker-0.0.1.whl\n")
+	node := Node{Repo: "file://" + repo, Commit: commit, Requirements: []string{"trimesh"},
+		Build: []string{"texture_baker", "uv_unwrapper"}}
+
+	state := t.TempDir()
+	site, err := installNodes(t.Context(), state, "python3", []Node{node}, uv, func(string) {})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if site == "" || builds.Load() != 2 {
+		t.Fatalf("site %q, %d builds", site, builds.Load())
+	}
+	if !strings.Contains(strings.Join(envSeen, " "), "TORCH_CUDA_ARCH_LIST=7.5") {
+		t.Error("the build was not told the card's architecture")
+	}
+	installed, _ := os.ReadFile(log)
+	if !strings.Contains(string(installed), "trimesh") || !strings.Contains(string(installed), "sm75/texture_baker/texture_baker-0.0.1") ||
+		!strings.Contains(string(installed), "uv_unwrapper-0.0.1") {
+		t.Errorf("installed %s", installed)
+	}
+	constraints, _ := os.ReadFile(filepath.Join(state, "constraints.txt"))
+	if strings.Contains(string(constraints), "texture-baker") || !strings.Contains(string(constraints), "numpy==2.5.3") {
+		t.Errorf("constraints %s", constraints)
+	}
+
+	// A second replica on the same kind of card finds the wheels built.
+	if _, err := installNodes(t.Context(), t.TempDir(), "python3", []Node{node}, uv, func(string) {}); err != nil {
+		t.Fatal(err)
+	}
+	if builds.Load() != 2 {
+		t.Errorf("built again: %d builds", builds.Load())
+	}
+	// Another kind of card builds its own.
+	cudaArch = func(context.Context, string) (string, error) { return "8.9", nil }
+	if _, err := installNodes(t.Context(), t.TempDir(), "python3", []Node{node}, uv, func(string) {}); err != nil {
+		t.Fatal(err)
+	}
+	if builds.Load() != 4 {
+		t.Errorf("an Ada used Turing's wheels: %d builds", builds.Load())
+	}
+}
+
+func TestANodeToCompileOnAMachineWithoutCUDASaysSo(t *testing.T) {
+	repo, commit := gitRepo(t, map[string]string{"__init__.py": "", "ext/setup.py": ""})
+	t.Setenv("XDG_CACHE_HOME", t.TempDir())
+	t.Setenv("HOME", t.TempDir())
+	t.Setenv("CUDA_HOME", "")
+	if _, err := os.Stat("/usr/local/cuda/bin/nvcc"); err == nil {
+		t.Skip("this machine has a CUDA toolkit")
+	}
+	oldArch := cudaArch
+	t.Cleanup(func() { cudaArch = oldArch })
+	cudaArch = func(context.Context, string) (string, error) { return "8.0", nil }
+	uv, _ := fakeUV(t, "")
+	_, err := installNodes(t.Context(), t.TempDir(), "python3", []Node{{Repo: "file://" + repo, Commit: commit, Build: []string{"ext"}}},
+		uv, func(string) {})
+	if err == nil || !strings.Contains(err.Error(), "no CUDA toolkit") {
+		t.Errorf("%v", err)
+	}
+}
+
+func TestWeightsANodeLoadsByRepositoryNameAreInTheHuggingFaceCache(t *testing.T) {
+	weights := t.TempDir()
+	_ = os.WriteFile(filepath.Join(weights, "config.yaml"), []byte("c"), 0o644)
+	_ = os.WriteFile(filepath.Join(weights, "model.safetensors"), []byte("m"), 0o644)
+	hub := t.TempDir()
+	if err := LinkHFCache(weights, "stabilityai/stable-fast-3d", hub); err != nil {
+		t.Fatal(err)
+	}
+	root := filepath.Join(hub, "models--stabilityai--stable-fast-3d")
+	ref, _ := os.ReadFile(filepath.Join(root, "refs", "main"))
+	if len(ref) != 40 {
+		t.Fatalf("refs/main %q is not a commit's form", ref)
+	}
+	b, err := os.ReadFile(filepath.Join(root, "snapshots", string(ref), "model.safetensors"))
+	if err != nil || string(b) != "m" {
+		t.Errorf("the weights through the cache: %q %v", b, err)
+	}
+	// Again, as a replica started a second time does.
+	if err := LinkHFCache(weights, "stabilityai/stable-fast-3d", hub); err != nil {
+		t.Errorf("a second time: %v", err)
+	}
+	for _, bad := range []string{"noslash", "a/b/c", "../x", "a/.."} {
+		if err := LinkHFCache(weights, bad, hub); err == nil {
+			t.Errorf("%q taken for a repository", bad)
+		}
+	}
+}

internal/comfy/progress.go

@@ -0,0 +1,223 @@
+package comfy
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/net/websocket"
+)
+
+// How far along a workflow is, which ComfyUI says only on its websocket and
+// only to the client that queued the workflow. The gate keeps one websocket
+// open to its ComfyUI, under a client id of its own, puts that id on every
+// workflow it lets through, and keeps the last word on each: the node
+// running and its step out of how many. The router asks at
+// /progress/{prompt_id} while it waits, and a job says it.
+
+// Progress is a workflow's state as the gate last heard it.
+type Progress struct {
+	PromptID string `json:"prompt_id,omitempty"`
+	// State is queued, running, done or failed.
+	State string `json:"state"`
+	// Ahead is how many workflows wait before it, while it is queued.
+	Ahead int `json:"ahead,omitempty"`
+	// Node is the workflow's node running, by its id; NodeClass its kind.
+	Node      string `json:"node,omitempty"`
+	NodeClass string `json:"node_class,omitempty"`
+	// Step of Steps is the running node's own count: a sampler's steps.
+	Step  int `json:"step,omitempty"`
+	Steps int `json:"steps,omitempty"`
+	// Percent is Step of Steps, where a node counts.
+	Percent int    `json:"percent,omitempty"`
+	Error   string `json:"error,omitempty"`
+}
+
+// progressBook is the last word on each of the most recent workflows.
+type progressBook struct {
+	mu    sync.Mutex
+	by    map[string]*Progress
+	order []string
+}
+
+// keptPrompts bounds the book: a gate serves one replica, which runs one
+// workflow at a time and queues a few.
+const keptPrompts = 256
+
+func newProgressBook() *progressBook { return &progressBook{by: map[string]*Progress{}} }
+
+func (b *progressBook) update(id string, f func(*Progress)) {
+	if id == "" {
+		return
+	}
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	p, ok := b.by[id]
+	if !ok {
+		p = &Progress{PromptID: id, State: "queued"}
+		b.by[id] = p
+		b.order = append(b.order, id)
+		for len(b.order) > keptPrompts {
+			delete(b.by, b.order[0])
+			b.order = b.order[1:]
+		}
+	}
+	f(p)
+}
+
+func (b *progressBook) get(id string) (Progress, bool) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	p, ok := b.by[id]
+	if !ok {
+		return Progress{}, false
+	}
+	return *p, true
+}
+
+// read takes one message off ComfyUI's websocket into the book.
+func (b *progressBook) read(msg []byte) {
+	var m struct {
+		Type string `json:"type"`
+		Data struct {
+			PromptID string          `json:"prompt_id"`
+			Node     json.RawMessage `json:"node"`
+			Value    int             `json:"value"`
+			Max      int             `json:"max"`
+			Message  string          `json:"exception_message"`
+			NodeType string          `json:"node_type"`
+		} `json:"data"`
+	}
+	if json.Unmarshal(msg, &m) != nil {
+		return
+	}
+	d := m.Data
+	var node string
+	_ = json.Unmarshal(d.Node, &node)
+	switch m.Type {
+	case "execution_start":
+		b.update(d.PromptID, func(p *Progress) { p.State, p.Ahead = "running", 0 })
+	case "executing":
+		b.update(d.PromptID, func(p *Progress) {
+			if node == "" {
+				// No node: the workflow is through.
+				p.State, p.Node, p.Step, p.Steps, p.Percent = "done", "", 0, 0, 100
+				return
+			}
+			p.State, p.Ahead, p.Node, p.Step, p.Steps, p.Percent = "running", 0, node, 0, 0, 0
+		})
+	case "progress":
+		b.update(d.PromptID, func(p *Progress) {
+			p.State, p.Step, p.Steps = "running", d.Value, d.Max
+			if node != "" {
+				p.Node = node
+			}
+			if d.Max > 0 {
+				p.Percent = min(100, d.Value*100/d.Max)
+			}
+		})
+	case "execution_success":
+		b.update(d.PromptID, func(p *Progress) { p.State, p.Percent = "done", 100 })
+	case "execution_error", "execution_interrupted":
+		b.update(d.PromptID, func(p *Progress) {
+			p.State = "failed"
+			p.Error = strings.TrimSpace(d.NodeType + ": " + d.Message)
+			if m.Type == "execution_interrupted" {
+				p.Error = "interrupted"
+			}
+		})
+	}
+}
+
+// watch keeps a websocket open to the ComfyUI at upstream under clientID,
+// reading into the book, until ctx ends: opened again when it closes, as it
+// does whenever ComfyUI restarts.
+func (b *progressBook) watch(ctx context.Context, upstream *url.URL, clientID string, log *slog.Logger) {
+	ws := "ws://" + upstream.Host + "/ws?clientId=" + url.QueryEscape(clientID)
+	wait := time.Second
+	for ctx.Err() == nil {
+		conn, err := websocket.Dial(ws, "", "http://"+upstream.Host)
+		if err == nil {
+			wait = time.Second
+			go func() { <-ctx.Done(); conn.Close() }()
+			for {
+				var msg []byte
+				if err := websocket.Message.Receive(conn, &msg); err != nil {
+					break
+				}
+				// Binary frames are previews of pictures; only text is news.
+				if len(msg) > 0 && msg[0] == '{' {
+					b.read(msg)
+				}
+			}
+			conn.Close()
+		} else if log != nil {
+			log.Debug("ComfyUI's websocket is not open yet", "err", err)
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(wait):
+		}
+		wait = min(wait*2, 30*time.Second)
+	}
+}
+
+// withClient is a /prompt body with the gate's client id in it, so the
+// progress of the workflow it queues comes to the gate's websocket.
+func withClient(body []byte, clientID string) []byte {
+	var m map[string]json.RawMessage
+	if json.Unmarshal(body, &m) != nil {
+		return body
+	}
+	id, _ := json.Marshal(clientID)
+	m["client_id"] = id
+	out, err := json.Marshal(m)
+	if err != nil {
+		return body
+	}
+	return out
+}
+
+// promptThroughGate forwards a /prompt with the gate's client id, and books
+// the workflow it queued as queued.
+func (b *progressBook) promptThroughGate(proxy http.Handler, clientID string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		body, err := io.ReadAll(io.LimitReader(r.Body, 64<<20))
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+		body = withClient(body, clientID)
+		r.Body = io.NopCloser(bytes.NewReader(body))
+		r.ContentLength = int64(len(body))
+		rec := &captured{ResponseWriter: w}
+		proxy.ServeHTTP(rec, r)
+		var out struct {
+			PromptID string `json:"prompt_id"`
+		}
+		if json.Unmarshal(rec.body.Bytes(), &out) == nil && out.PromptID != "" {
+			b.update(out.PromptID, func(*Progress) {})
+		}
+	}
+}
+
+// captured passes a response on and keeps a copy of the first of it.
+type captured struct {
+	http.ResponseWriter
+	body bytes.Buffer
+}
+
+func (c *captured) Write(p []byte) (int, error) {
+	if c.body.Len() < 64<<10 {
+		c.body.Write(p)
+	}
+	return c.ResponseWriter.Write(p)
+}

internal/comfy/progress_test.go

@@ -0,0 +1,192 @@
+package comfy
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestTheBookReadsComfyUIsWebsocket(t *testing.T) {
+	b := newProgressBook()
+	for _, m := range []string{
+		`{"type":"status","data":{"status":{"exec_info":{"queue_remaining":1}}}}`,
+		`{"type":"execution_start","data":{"prompt_id":"p1"}}`,
+		`{"type":"executing","data":{"node":"5","prompt_id":"p1"}}`,
+		`{"type":"progress","data":{"value":12,"max":30,"prompt_id":"p1","node":"5"}}`,
+	} {
+		b.read([]byte(m))
+	}
+	p, _ := b.get("p1")
+	if p.State != "running" || p.Node != "5" || p.Step != 12 || p.Steps != 30 || p.Percent != 40 {
+		t.Errorf("%+v", p)
+	}
+	b.read([]byte(`{"type":"executing","data":{"node":null,"prompt_id":"p1"}}`))
+	if p, _ := b.get("p1"); p.State != "done" || p.Percent != 100 {
+		t.Errorf("finished: %+v", p)
+	}
+	b.read([]byte(`{"type":"execution_error","data":{"prompt_id":"p2","node_type":"KSampler","exception_message":"CUDA out of memory"}}`))
+	if p, _ := b.get("p2"); p.State != "failed" || p.Error != "KSampler: CUDA out of memory" {
+		t.Errorf("failed: %+v", p)
+	}
+	for i := range keptPrompts + 10 {
+		b.update(fmt.Sprint("x", i), func(*Progress) {})
+	}
+	if _, ok := b.get("p1"); ok || len(b.by) != keptPrompts {
+		t.Errorf("the book kept %d", len(b.by))
+	}
+}
+
+func TestTheGateHearsTheWorkflowsItLetsThrough(t *testing.T) {
+	var mu sync.Mutex
+	var sent map[string]any
+	comfy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/prompt" {
+			mu.Lock()
+			_ = json.NewDecoder(r.Body).Decode(&sent)
+			mu.Unlock()
+			fmt.Fprint(w, `{"prompt_id":"p9"}`)
+		}
+	}))
+	defer comfy.Close()
+	u, _ := url.Parse(comfy.URL)
+	book := newProgressBook()
+	gate := httptest.NewServer(newGate(u, "", []string{"m"}, book, "llmgw-gate-1"))
+	defer gate.Close()
+	resp, err := http.Post(gate.URL+"/prompt", "application/json", strings.NewReader(`{"prompt":{},"client_id":"router"}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, _ := io.ReadAll(resp.Body)
+	resp.Body.Close()
+	if !strings.Contains(string(b), "p9") {
+		t.Fatalf("the answer did not come through: %s", b)
+	}
+	mu.Lock()
+	if sent["client_id"] != "llmgw-gate-1" {
+		t.Errorf("ComfyUI was sent client %v: its progress would go to nobody listening", sent["client_id"])
+	}
+	mu.Unlock()
+	book.read([]byte(`{"type":"progress","data":{"value":3,"max":4,"prompt_id":"p9","node":"2"}}`))
+	resp, _ = http.Get(gate.URL + "/progress/p9")
+	var p Progress
+	_ = json.NewDecoder(resp.Body).Decode(&p)
+	resp.Body.Close()
+	if p.State != "running" || p.Percent != 75 {
+		t.Errorf("/progress: %+v", p)
+	}
+	if resp, _ := http.Get(gate.URL + "/progress/unknown"); resp.StatusCode != http.StatusNotFound {
+		t.Errorf("an unknown workflow: %d", resp.StatusCode)
+	}
+}
+
+func TestAWaitingWorkflowSaysHowManyAreAheadAndThenHowFarAlong(t *testing.T) {
+	var mu sync.Mutex
+	stage := 0
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		s := stage
+		mu.Unlock()
+		switch r.URL.Path {
+		case "/prompt":
+			fmt.Fprint(w, `{"prompt_id":"me"}`)
+		case "/queue":
+			if s == 0 {
+				fmt.Fprint(w, `{"queue_running":[[1,"a"]],"queue_pending":[[3,"me"],[2,"b"],[4,"c"]]}`)
+			} else {
+				fmt.Fprint(w, `{"queue_running":[[3,"me"]],"queue_pending":[]}`)
+			}
+		case "/progress/me":
+			fmt.Fprint(w, `{"state":"running","node":"5","step":6,"steps":12,"percent":50}`)
+		case "/history/me":
+			if s < 2 {
+				fmt.Fprint(w, `{}`)
+				return
+			}
+			fmt.Fprint(w, `{"me":{"status":{"status_str":"success","completed":true},"outputs":{"9":{"images":[{"filename":"a.png","type":"temp"}]}}}}`)
+		case "/view":
+			w.Header().Set("Content-Type", "image/png")
+			fmt.Fprint(w, "png")
+		}
+	}))
+	defer srv.Close()
+	var seen []Progress
+	c := &Client{Poll: time.Millisecond}
+	done := make(chan error, 1)
+	go func() {
+		_, err := c.GenerateWatch(t.Context(), srv.URL, "", map[string]any{"5": map[string]any{"class_type": "KSampler"}},
+			func(p Progress) {
+				mu.Lock()
+				seen = append(seen, p)
+				stage++
+				mu.Unlock()
+			})
+		done <- err
+	}()
+	if err := <-done; err != nil {
+		t.Fatal(err)
+	}
+	if len(seen) < 2 || seen[0].State != "queued" || seen[0].Ahead != 2 {
+		t.Fatalf("%+v: queued behind the one running and the one numbered before it, wanted first", seen)
+	}
+	if seen[1].State != "running" || seen[1].Percent != 50 || seen[1].NodeClass != "KSampler" {
+		t.Errorf("then %+v", seen[1])
+	}
+}
+
+func TestANodeIsPutAtItsCommit(t *testing.T) {
+	if _, err := exec.LookPath("git"); err != nil {
+		t.Skip("no git")
+	}
+	repo := t.TempDir()
+	run := func(args ...string) string {
+		cmd := exec.Command("git", args...)
+		cmd.Dir = repo
+		cmd.Env = append(os.Environ(), "GIT_AUTHOR_NAME=t", "GIT_AUTHOR_EMAIL=t@t", "GIT_COMMITTER_NAME=t", "GIT_COMMITTER_EMAIL=t@t")
+		b, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Fatalf("git %v: %v %s", args, err, b)
+		}
+		return strings.TrimSpace(string(b))
+	}
+	run("init", "-q")
+	run("config", "uploadpack.allowReachableSHA1InWant", "true")
+	_ = os.WriteFile(filepath.Join(repo, "__init__.py"), []byte("v1\n"), 0o644)
+	run("add", ".")
+	run("commit", "-qm", "one")
+	first := run("rev-parse", "HEAD")
+	_ = os.WriteFile(filepath.Join(repo, "__init__.py"), []byte("v2\n"), 0o644)
+	run("commit", "-qam", "two")
+
+	state := t.TempDir()
+	site, err := installNodes(t.Context(), state, "python3", []Node{{Repo: "file://" + repo, Commit: first}}, "", func(string) {})
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, _ := os.ReadFile(filepath.Join(state, "custom_nodes", filepath.Base(repo), "__init__.py"))
+	if string(b) != "v1\n" || site != "" {
+		t.Errorf("the node is %q, site %q: wanted the commit named, not the branch's head", b, site)
+	}
+	if _, err := installNodes(t.Context(), state, "python3", []Node{{Repo: "file://" + repo, Commit: first,
+		Requirements: []string{"trimesh"}}}, "", func(string) {}); err == nil || !strings.Contains(err.Error(), "no uv") {
+		t.Errorf("packages without a uv: %v", err)
+	}
+}
+
+func TestANodesOwnRangeDecidesThePackagesItNames(t *testing.T) {
+	freeze := []byte("numpy==2.3.1\ntransformers==5.19.0\nhuggingface-hub==1.33.0\nPillow==12.3.0\n")
+	got := string(withoutNamed(freeze, []string{"transformers>=4.50.3,<5", "Huggingface_Hub<1", "trimesh"}))
+	if strings.Contains(got, "transformers") || strings.Contains(got, "huggingface") ||
+		!strings.Contains(got, "numpy==2.3.1") || !strings.Contains(got, "Pillow==12.3.0") {
+		t.Errorf("constraints %q", got)
+	}
+}

internal/comfy/workflows/flux-dev.json

@@ -0,0 +1,12 @@
+{
+  "1": {"class_type": "CheckpointLoaderSimple", "inputs": {"ckpt_name": "{{checkpoint}}"}},
+  "2": {"class_type": "CLIPTextEncode", "inputs": {"text": "{{prompt}}", "clip": ["1", 1]}},
+  "3": {"class_type": "CLIPTextEncode", "inputs": {"text": "{{negative_prompt}}", "clip": ["1", 1]}},
+  "8": {"class_type": "FluxGuidance", "inputs": {"guidance": "{{guidance|3.5}}", "conditioning": ["2", 0]}},
+  "4": {"class_type": "EmptySD3LatentImage", "inputs": {"width": "{{width}}", "height": "{{height}}", "batch_size": "{{n}}"}},
+  "5": {"class_type": "KSampler", "inputs": {
+    "seed": "{{seed}}", "steps": "{{steps|20}}", "cfg": 1, "sampler_name": "euler", "scheduler": "simple", "denoise": 1,
+    "model": ["1", 0], "positive": ["8", 0], "negative": ["3", 0], "latent_image": ["4", 0]}},
+  "6": {"class_type": "VAEDecode", "inputs": {"samples": ["5", 0], "vae": ["1", 2]}},
+  "7": {"class_type": "PreviewImage", "inputs": {"images": ["6", 0]}}
+}

internal/comfy/workflows/flux-schnell.json

@@ -0,0 +1,11 @@
+{
+  "1": {"class_type": "CheckpointLoaderSimple", "inputs": {"ckpt_name": "{{checkpoint}}"}},
+  "2": {"class_type": "CLIPTextEncode", "inputs": {"text": "{{prompt}}", "clip": ["1", 1]}},
+  "3": {"class_type": "CLIPTextEncode", "inputs": {"text": "{{negative_prompt}}", "clip": ["1", 1]}},
+  "4": {"class_type": "EmptySD3LatentImage", "inputs": {"width": "{{width}}", "height": "{{height}}", "batch_size": "{{n}}"}},
+  "5": {"class_type": "KSampler", "inputs": {
+    "seed": "{{seed}}", "steps": "{{steps|4}}", "cfg": 1, "sampler_name": "euler", "scheduler": "simple", "denoise": 1,
+    "model": ["1", 0], "positive": ["2", 0], "negative": ["3", 0], "latent_image": ["4", 0]}},
+  "6": {"class_type": "VAEDecode", "inputs": {"samples": ["5", 0], "vae": ["1", 2]}},
+  "7": {"class_type": "PreviewImage", "inputs": {"images": ["6", 0]}}
+}

internal/comfy/workflows/triposr.json

@@ -0,0 +1,9 @@
+{
+  "1": {"class_type": "LoadImage", "inputs": {"image": "{{image}}"}},
+  "5": {"class_type": "LLMGWPrepareForMesh", "inputs": {"image": ["1", 0], "mask": ["1", 1],
+        "foreground_ratio": 0.85, "background": 0.5, "remove_background": "auto", "rembg_model": "u2net"}},
+  "2": {"class_type": "TripoSRModelLoader", "inputs": {"model": "{{checkpoint}}", "chunk_size": 8192}},
+  "3": {"class_type": "TripoSRSampler", "inputs": {"model": ["2", 0], "reference_image": ["5", 0],
+        "geometry_resolution": "{{resolution|256}}", "threshold": 25.0}},
+  "4": {"class_type": "TripoSRViewer", "inputs": {"mesh": ["3", 0]}}
+}

internal/config/config.go

@@ -158,6 +158,13 @@ type Server struct {
 	// Firewall turns llmgw's firewall on every machine on or off.
 	Firewall FirewallSettings `koanf:"firewall"`
 
+	// Presets is how the models that come with llmgw reach the catalog.
+	Presets PresetSettings `koanf:"presets"`
+
+	// OnDemand is how models that load when asked for take turns on the
+	// cards.
+	OnDemand OnDemandSettings `koanf:"on_demand"`
+
 	// Agents are the nodes' agent settings: agent.yaml's keys but those an
 	// agent needs to start, for every node (default) and for one
 	// (nodes.<id>). Sent to the agents as they change; an agent whose
@@ -493,6 +500,11 @@ type Personal struct {
 type Price struct {
 	PromptPer1k     int64 `koanf:"prompt_per_1k"`
 	CompletionPer1k int64 `koanf:"completion_per_1k"`
+	// PerImage is the cost of one picture, for a model that makes them
+	// (/v1/images/generations), on top of its prompt's tokens.
+	PerImage int64 `koanf:"per_image"`
+	// PerMesh is the cost of one 3D model (/v1/3d/generations).
+	PerMesh int64 `koanf:"per_mesh"`
 }
 
 // Control configures the control plane.
@@ -686,6 +698,10 @@ type Band struct {
 	Name              string  `koanf:"name"`
 	Priority          int     `koanf:"priority"`
 	SaturationCeiling float64 `koanf:"saturation_ceiling"`
+	// QueueTTL is how long this band's requests may wait for room; the
+	// admission's queue_ttl unless set. Long for a band of bulk work, which
+	// had rather wait behind people than be turned away.
+	QueueTTL time.Duration `koanf:"queue_ttl"`
 }
 
 // Timeouts bounds each phase of an upstream request.
@@ -723,7 +739,10 @@ type Endpoint struct {
 	Models []string `koanf:"models"`
 	// Engine names the inference engine, which decides what its metrics are
 	// called. Empty means vLLM's names.
-	Engine   string  `koanf:"engine"`
+	Engine string `koanf:"engine"`
+	// Workflow is the ComfyUI workflow for engine: comfyui, a built-in's
+	// name or its JSON; flux-schnell unless set.
+	Workflow string  `koanf:"workflow"`
 	Pool     string  `koanf:"pool"`
 	Weight   float64 `koanf:"weight"`
 	Priority int     `koanf:"priority"`
@@ -783,6 +802,7 @@ func Default() Server {
 		MaxConnections: 10_000,
 		Mirror:         Mirror{UpdateCheck: 6 * time.Hour},
 		Firewall:       FirewallSettings{Enabled: true},
+		Presets:        PresetSettings{Auto: true},
 		Control: Control{
 			Interval:         5 * time.Second,
 			BaseBackoff:      10 * time.Second,

internal/config/ondemand.go

@@ -0,0 +1,18 @@
+package config
+
+import "time"
+
+// OnDemandSettings is how models that load when asked for take turns on the
+// cards: on a site with fewer cards than such models, the wait between one
+// and the next.
+type OnDemandSettings struct {
+	// EvictAfterIdle is how long an on-demand replica must go unasked-for
+	// before a model that wants its card may have it. Zero keeps 2m.
+	EvictAfterIdle time.Duration `koanf:"evict_after_idle"`
+	// MinLifetime is how long a replica that has just come up is safe from
+	// that, so two models do not take turns paying for loads. Zero keeps
+	// 5m. On one card shared by a picture model and a 3D model, 1m each
+	// brings the wait between a picture and its mesh to about a minute.
+	// Both are in force on the leader within seconds.
+	MinLifetime time.Duration `koanf:"min_lifetime"`
+}

internal/config/presets.go

@@ -0,0 +1,13 @@
+package config
+
+// PresetSettings is how the models that come with llmgw reach the catalog.
+type PresetSettings struct {
+	// Auto has the leading control plane add a picture model (flux-schnell)
+	// and a 3D model (triposr) by itself, on demand, once a node has a card
+	// that fits one and the catalog has no model that makes the same kind of
+	// thing — so a new cluster's portal has its pictures and 3D pages
+	// without anybody writing a definition. Only where the cluster already
+	// installs ComfyUI (engines.comfyui). A preset somebody removed is not
+	// added again by itself. In force on the leader within a minute.
+	Auto bool `koanf:"auto"`
+}

internal/control/adminapi/api.go

@@ -81,11 +81,15 @@ type API struct {
 	// revoke records a removed node, so its certificate is refused.
 	revoke func(ctx context.Context, nodeID string, at time.Time) error
 
-	models   Models
-	capacity Capacity
-	usage    Usage
-	quotas   Quotas
-	ctl      *control.Controller
+	models Models
+	// presets keeps what became of each preset, presetCfg reads the
+	// settings in force; nil without a store.
+	presets   PresetStore
+	presetCfg func() PresetConfig
+	capacity  Capacity
+	usage     Usage
+	quotas    Quotas
+	ctl       *control.Controller
 }
 
 // New builds the API over a controller.
@@ -166,6 +170,7 @@ func (a *API) Register(mux Mux) {
 		}
 		writeJSON(w, http.StatusOK, t)
 	})
+	a.registerPresets(mux)
 	mux.HandleFunc("GET /api/v1/models", a.listModels)
 	mux.HandleFunc("GET /api/v1/replicas", a.listReplicas)
 	// Listing is a read and deleting is a separate verb, so a mistyped
@@ -203,6 +208,9 @@ func (a *API) Register(mux Mux) {
 	mux.HandleFunc("POST /api/v1/models/{name}/origin", a.setOrigin)
 	mux.HandleFunc("GET /api/v1/plan", a.planModel)
 	mux.HandleFunc("POST /api/v1/metrics/range", a.metricsBatch)
+	mux.HandleFunc("GET /api/v1/client-jobs", a.listJobs)
+	mux.HandleFunc("GET /api/v1/client-jobs/{id}", a.getJob)
+	mux.HandleFunc("POST /api/v1/client-jobs/{id}/cancel", a.cancelJob)
 	mux.HandleFunc("GET /api/v1/requests/{id}", a.request)
 	mux.HandleFunc("GET /api/v1/requests/{id}/body", a.requestBody)
 	mux.HandleFunc("POST /api/v1/requests/{id}/replay", a.replayRequest)
@@ -1226,6 +1234,8 @@ func (a *API) removeModel(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, err.Error())
 		return
 	}
+	// A preset removed is one the leader must not put back by itself.
+	a.presetDeclined(r.Context(), name, actorOf(r))
 	writeJSON(w, http.StatusOK, Removed{Removed: name})
 }
 
@@ -1611,6 +1621,8 @@ type RequestView struct {
 	TTFTMs           int64     `json:"ttft_ms"`
 	PromptTokens     int64     `json:"prompt_tokens"`
 	CompletionTokens int64     `json:"completion_tokens"`
+	Images           int64     `json:"images,omitempty"`
+	Meshes           int64     `json:"meshes,omitempty"`
 	CostMicros       int64     `json:"cost_micros"`
 	// What the guardrails did, by name.
 	GuardAction   string `json:"guard_action,omitempty"`
@@ -1644,7 +1656,7 @@ func (a *API) request(w http.ResponseWriter, r *http.Request) {
 		RequestID: u.RequestID, At: u.At, KeyID: u.KeyID, UserID: u.UserID, ProjectID: u.ProjectID,
 		Model: u.Model, ServedModel: u.ServedModel, Replica: u.Replica, Status: u.Status,
 		LatencyMs: u.LatencyMs, QueueMs: u.QueueMs, TTFTMs: u.TTFTMs,
-		PromptTokens: u.PromptTokens, CompletionTokens: u.CompletionTokens, CostMicros: u.CostMicros,
+		PromptTokens: u.PromptTokens, CompletionTokens: u.CompletionTokens, Images: u.Images, Meshes: u.Meshes, CostMicros: u.CostMicros,
 		GuardAction: u.GuardAction, GuardPolicy: u.GuardPolicy, GuardCategory: u.GuardCategory, GuardRule: u.GuardRule, GuardMs: u.GuardMs,
 		EndUser: u.EndUser, Tags: u.Tags, CacheHit: u.CacheHit,
 	})

internal/control/adminapi/export.go

@@ -75,11 +75,11 @@ func (a *API) usageExport(w http.ResponseWriter, r *http.Request) {
 func WriteExportCSV(w io.Writer, rows []store.ExportRow) {
 	c := csv.NewWriter(w)
 	_ = c.Write([]string{"period_start", "org", "team", "project", "user", "key", "model",
-		"requests", "errors", "limited", "prompt_tokens", "completion_tokens", "cost_micros", "cost"})
+		"requests", "errors", "limited", "prompt_tokens", "completion_tokens", "cost_micros", "cost", "images", "meshes"})
 	for _, r := range rows {
 		_ = c.Write([]string{r.Period.Format(time.RFC3339), safe(r.Org), safe(r.Team), safe(r.Project), safe(r.User),
 			r.Key, safe(r.Model), i(r.Requests), i(r.Errors), i(r.Limited), i(r.Prompt), i(r.Completion),
-			i(r.CostMicros), strconv.FormatFloat(float64(r.CostMicros)/1e6, 'f', 6, 64)})
+			i(r.CostMicros), strconv.FormatFloat(float64(r.CostMicros)/1e6, 'f', 6, 64), i(r.Images), i(r.Meshes)})
 	}
 	c.Flush()
 }

internal/control/adminapi/jobs.go

@@ -0,0 +1,115 @@
+package adminapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+	"time"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
+)
+
+// Jobs — 3D models asked for and asked after — as an operator sees them:
+// every owner's, which a client sees only of its own.
+
+// jobStore is what jobs need of the store; asked of the usage source by
+// type assertion, as requestFinder is.
+type jobStore interface {
+	AllJobs(ctx context.Context, status string, limit int) ([]store.Job, error)
+	JobByID(ctx context.Context, id string) (store.Job, error)
+	CancelJob(ctx context.Context, id string, now time.Time) (store.Job, error)
+}
+
+// JobView is one job.
+type JobView struct {
+	ID           string          `json:"id"`
+	Owner        string          `json:"owner"`
+	KeyID        string          `json:"key_id"`
+	Endpoint     string          `json:"endpoint"`
+	Model        string          `json:"model"`
+	Status       string          `json:"status"`
+	Progress     json.RawMessage `json:"progress,omitempty"`
+	OutputFileID string          `json:"output_file_id,omitempty"`
+	ContentType  string          `json:"content_type,omitempty"`
+	Error        string          `json:"error,omitempty"`
+	CreatedAt    time.Time       `json:"created_at"`
+	StartedAt    *time.Time      `json:"started_at,omitempty"`
+	FinishedAt   *time.Time      `json:"finished_at,omitempty"`
+}
+
+func jobView(j store.Job) JobView {
+	v := JobView{ID: j.ID, Owner: j.Owner, KeyID: j.KeyID, Endpoint: j.Endpoint, Model: j.Model, Status: j.Status,
+		OutputFileID: j.OutputFileID, ContentType: j.ContentType, Error: j.Error, CreatedAt: j.CreatedAt}
+	if j.Progress != "" && json.Valid([]byte(j.Progress)) {
+		v.Progress = json.RawMessage(j.Progress)
+	}
+	if !j.StartedAt.IsZero() {
+		v.StartedAt = &j.StartedAt
+	}
+	if !j.FinishedAt.IsZero() {
+		v.FinishedAt = &j.FinishedAt
+	}
+	return v
+}
+
+func (a *API) jobs() (jobStore, bool) {
+	s, ok := a.usage.(jobStore)
+	return s, ok
+}
+
+func (a *API) listJobs(w http.ResponseWriter, r *http.Request) {
+	s, ok := a.jobs()
+	if !ok {
+		writeError(w, http.StatusNotImplemented, "jobs need the store, which this control plane runs without")
+		return
+	}
+	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
+	js, err := s.AllJobs(r.Context(), r.URL.Query().Get("status"), limit)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	out := make([]JobView, 0, len(js))
+	for _, j := range js {
+		out = append(out, jobView(j))
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+func (a *API) getJob(w http.ResponseWriter, r *http.Request) {
+	s, ok := a.jobs()
+	if !ok {
+		writeError(w, http.StatusNotImplemented, "jobs need the store, which this control plane runs without")
+		return
+	}
+	j, err := s.JobByID(r.Context(), r.PathValue("id"))
+	if errors.Is(err, store.ErrNotFound) {
+		writeError(w, http.StatusNotFound, "no job "+r.PathValue("id"))
+		return
+	}
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	writeJSON(w, http.StatusOK, jobView(j))
+}
+
+func (a *API) cancelJob(w http.ResponseWriter, r *http.Request) {
+	s, ok := a.jobs()
+	if !ok {
+		writeError(w, http.StatusNotImplemented, "jobs need the store, which this control plane runs without")
+		return
+	}
+	if _, err := s.JobByID(r.Context(), r.PathValue("id")); errors.Is(err, store.ErrNotFound) {
+		writeError(w, http.StatusNotFound, "no job "+r.PathValue("id"))
+		return
+	}
+	j, err := s.CancelJob(r.Context(), r.PathValue("id"), time.Now())
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	writeJSON(w, http.StatusOK, jobView(j))
+}

internal/control/adminapi/kb.go

@@ -499,7 +499,11 @@ func (a *API) kbSearch(w http.ResponseWriter, r *http.Request) {
 	// Said, not swallowed: a search that quietly lost its meaning half
 	// looks like a collection that does not know the answer.
 	if a.kb.Embed != nil {
-		v, err := a.kb.Embed(r.Context(), c.EmbedModel, in.Query)
+		question := in.Query
+		if m, ok := a.ctl.Catalog().Resolve(c.EmbedModel); ok {
+			question = m.QueryPrefix + question
+		}
+		v, err := a.kb.Embed(r.Context(), c.EmbedModel, question)
 		if err != nil {
 			writeError(w, http.StatusBadGateway, c.EmbedModel+" did not embed the question: "+err.Error())
 			return

internal/control/adminapi/presets.go

@@ -0,0 +1,353 @@
+package adminapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/provision"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/catalog"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/settings"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
+)
+
+// PresetsView is the models that come with llmgw, and whether the leader adds
+// them by itself.
+type PresetsView struct {
+	// Auto is whether a preset is added when a node fits it and the catalog
+	// has no model that makes what it makes (presets.auto).
+	Auto bool `json:"auto"`
+	// ComfyUI is engines.comfyui as it stands: the version the nodes
+	// install, "" for none — in which case adding a preset sets it, and the
+	// control planes start again on that.
+	ComfyUI string       `json:"comfyui"`
+	Presets []PresetView `json:"presets"`
+}
+
+// PresetView is one preset as it stands in this cluster.
+type PresetView struct {
+	Name        string          `json:"name"`
+	Makes       string          `json:"makes"`
+	Description string          `json:"description"`
+	Card        string          `json:"card"`
+	Licence     catalog.License `json:"licence"`
+	// Fits is whether some node has a card that meets the preset's need;
+	// FitsClasses names those classes.
+	Fits        bool     `json:"fits"`
+	FitsClasses []string `json:"fits_classes,omitempty"`
+	InCatalog   bool     `json:"in_catalog"`
+	// AddedBy is "auto" when the leader added it, who did otherwise, ""
+	// when it was not added as a preset; AddedAt is when.
+	AddedBy string    `json:"added_by,omitempty"`
+	AddedAt time.Time `json:"added_at,omitzero"`
+	// Declined is whether somebody removed it after it was added, so it is
+	// not added again by itself; adding it again clears that.
+	Declined bool `json:"declined"`
+	// Blocked is why the leader does not add it by itself — presets.auto
+	// off, no ComfyUI, no card that fits, declined, another model already
+	// making the same — empty when it would or has.
+	Blocked string `json:"blocked,omitempty"`
+}
+
+// PresetsAutoRequest turns the automatic adding of presets on or off.
+type PresetsAutoRequest struct {
+	On bool `json:"on"`
+}
+
+// errPresetsUnavailable is a control plane without the store presets are
+// kept in.
+var errPresetsUnavailable = errors.New("this control plane has no store, so presets cannot be added here")
+
+// PresetStore keeps what became of each preset, and the audit log the
+// leader writes its own additions to.
+type PresetStore interface {
+	PresetStates(ctx context.Context) (map[string]store.PresetState, error)
+	PresetAdded(ctx context.Context, name, by string, at time.Time) error
+	PresetDeclined(ctx context.Context, name, by string, at time.Time) error
+	WriteAudit(ctx context.Context, e store.AuditEvent) error
+}
+
+// PresetConfig is what the presets read of the settings in force.
+type PresetConfig struct {
+	// Auto is presets.auto.
+	Auto bool
+	// ComfyUI is engines.comfyui: the version the nodes install, empty for
+	// none.
+	ComfyUI string
+}
+
+// SetPresets enables the presets: where what became of them is kept, and
+// the settings in force.
+func (a *API) SetPresets(st PresetStore, cfg func() PresetConfig) {
+	a.presets, a.presetCfg = st, cfg
+}
+
+// Presets is the presets as they stand in this cluster.
+func (a *API) Presets(ctx context.Context) (PresetsView, error) {
+	if a.presets == nil || a.presetCfg == nil {
+		return PresetsView{}, errPresetsUnavailable
+	}
+	states, err := a.presets.PresetStates(ctx)
+	if err != nil {
+		return PresetsView{}, err
+	}
+	cfg := a.presetCfg()
+	cat := a.ctl.Catalog()
+	kinds := a.gpuKinds()
+	out := PresetsView{Auto: cfg.Auto, ComfyUI: cfg.ComfyUI}
+	for _, p := range catalog.Presets() {
+		v := PresetView{Name: p.Model.Name, Makes: p.Makes, Description: p.Model.Description,
+			Card: presetCard(p.Model), FitsClasses: presetFits(p.Model, kinds)}
+		if p.Model.License != nil {
+			v.Licence = *p.Model.License
+		}
+		v.Fits = len(v.FitsClasses) > 0
+		_, v.InCatalog = cat.Resolve(p.Model.Name)
+		if st, ok := states[p.Model.Name]; ok {
+			v.AddedBy, v.AddedAt, v.Declined = st.AddedBy, st.AddedAt, st.Declined
+		}
+		v.Blocked = presetBlocked(p, v, cfg, cat)
+		out.Presets = append(out.Presets, v)
+	}
+	return out, nil
+}
+
+// AddPreset adds the preset of that name, and clears its decline. A cluster
+// that installs no ComfyUI yet is set to (engines.comfyui), as `llmgw ctl
+// model add` does; that change starts the control planes again.
+func (a *API) AddPreset(ctx context.Context, name, by string) error {
+	if a.presets == nil || a.presetCfg == nil || a.models == nil {
+		return errPresetsUnavailable
+	}
+	p, ok := catalog.PresetNamed(name)
+	if !ok {
+		return fmt.Errorf("%w: %q (there are %s)", errNoSuchPreset, name, strings.Join(catalog.PresetNames(), ", "))
+	}
+	if _, in := a.ctl.Catalog().Resolve(name); in {
+		return fmt.Errorf("%s is already in the catalog", name)
+	}
+	if a.presetCfg().ComfyUI == "" {
+		if err := a.setComfyUI(ctx, by); err != nil {
+			return err
+		}
+	}
+	if err := a.models.Add(ctx, p.Model, by); err != nil {
+		return err
+	}
+	return a.presets.PresetAdded(ctx, name, by, time.Now())
+}
+
+// SetAutoPresets turns presets.auto on or off.
+func (a *API) SetAutoPresets(ctx context.Context, on bool, by string) error {
+	if a.presets == nil {
+		return errPresetsUnavailable
+	}
+	note := "presets added by themselves: " + map[bool]string{true: "on", false: "off"}[on]
+	return a.editSettings(ctx, []string{"presets", "auto"}, strconv.FormatBool(on), by, note)
+}
+
+// PresetsPass adds, as "auto", each preset a node fits whose kind of model
+// the catalog has none of: run by the leader, now and then. It adds nothing
+// with presets.auto off, where the cluster installs no ComfyUI, or a preset
+// somebody declined. It says what it added.
+func (a *API) PresetsPass(ctx context.Context) ([]string, error) {
+	v, err := a.Presets(ctx)
+	if err != nil || !v.Auto {
+		return nil, err
+	}
+	var added []string
+	for _, pv := range v.Presets {
+		if pv.Blocked != "" || pv.InCatalog {
+			continue
+		}
+		p, _ := catalog.PresetNamed(pv.Name)
+		if err := a.models.Add(ctx, p.Model, store.PresetAdder); err != nil {
+			return added, fmt.Errorf("adding %s: %w", pv.Name, err)
+		}
+		now := time.Now()
+		if err := a.presets.PresetAdded(ctx, pv.Name, store.PresetAdder, now); err != nil {
+			return added, err
+		}
+		_ = a.presets.WriteAudit(ctx, store.AuditEvent{At: now, Actor: store.PresetAdder, Source: "presets",
+			Action: "add preset", Target: pv.Name, Status: http.StatusOK,
+			Detail: fmt.Sprintf("%s, on demand: a node has %s (%s) and the catalog made no %s",
+				pv.Name, strings.Join(pv.FitsClasses, ", "), pv.Card, pv.Makes)})
+		added = append(added, pv.Name)
+	}
+	return added, nil
+}
+
+// presetDeclined records a preset's name removed from the catalog, so the
+// leader does not put it back.
+func (a *API) presetDeclined(ctx context.Context, name, by string) {
+	if a.presets == nil {
+		return
+	}
+	if _, ok := catalog.PresetNamed(name); ok {
+		_ = a.presets.PresetDeclined(ctx, name, by, time.Now())
+	}
+}
+
+// presetBlocked is why the leader would not add a preset by itself, empty
+// when it would (or has).
+func presetBlocked(p catalog.Preset, v PresetView, cfg PresetConfig, cat *catalog.Catalog) string {
+	switch {
+	case v.InCatalog:
+		return ""
+	case v.Declined:
+		return "removed from the catalog after it was added; add it again to undo"
+	case !cfg.Auto:
+		return "presets.auto is off"
+	case cfg.ComfyUI == "":
+		return "the cluster installs no ComfyUI (engines.comfyui); adding it by hand sets that"
+	case !v.Fits:
+		return "no node has a card it needs (" + v.Card + ")"
+	}
+	for _, m := range cat.Models() {
+		if p.Makes == catalog.OutputPictures && m.MakesImages() || p.Makes == catalog.OutputMeshes && m.MakesMeshes() {
+			return "the catalog has " + m.Name + ", which makes " + p.Makes + " already"
+		}
+	}
+	return ""
+}
+
+// presetCard is what a preset needs of a card, as people read it.
+func presetCard(m catalog.Model) string {
+	var needs []string
+	for _, pr := range m.Profiles {
+		switch {
+		case pr.GPU != nil:
+			needs = append(needs, pr.GPU.String())
+		case pr.GPUClass != "":
+			needs = append(needs, pr.GPUClass)
+		}
+	}
+	return strings.Join(needs, " or ")
+}
+
+// presetFits are the classes of card in the cluster one of the preset's
+// profiles can run on.
+func presetFits(m catalog.Model, kinds []catalog.GPUKind) []string {
+	var out []string
+	for _, k := range kinds {
+		for _, pr := range m.Profiles {
+			if pr.GPU != nil && pr.GPU.Fits(k) || pr.GPU == nil && pr.GPUClass == k.Class {
+				out = append(out, k.Class)
+				break
+			}
+		}
+	}
+	return out
+}
+
+// gpuKinds are the kinds of card the cluster's nodes have.
+func (a *API) gpuKinds() []catalog.GPUKind {
+	var gpus []discovery.GPU
+	for _, n := range a.ctl.Nodes() {
+		gpus = append(gpus, n.GPUs...)
+	}
+	return catalog.GPUKinds(gpus)
+}
+
+// setComfyUI has the nodes install the ComfyUI this release knows.
+func (a *API) setComfyUI(ctx context.Context, by string) error {
+	if a.settings != nil {
+		cur, err := a.settings.Store.ClusterSettings(ctx)
+		if err != nil {
+			return err
+		}
+		if doc, err := settings.FromBytes("settings", []byte(cur.Body)); err == nil {
+			if n := doc.Node([]string{"engines", catalog.EngineComfyUI}); n != nil && n.Value == "" {
+				return errors.New("engines.comfyui is set to none, so the nodes install no ComfyUI: " +
+					"set a version (llmgw ctl config set engines.comfyui " + provision.ComfyUIVersion() + ")")
+			}
+		}
+	}
+	return a.editSettings(ctx, []string{"engines", catalog.EngineComfyUI}, provision.ComfyUIVersion(), by,
+		"ComfyUI for the presets")
+}
+
+// editSettings sets one key of the cluster's settings, as a new version.
+func (a *API) editSettings(ctx context.Context, path []string, value, by, note string) error {
+	if a.settings == nil {
+		return errors.New("this control plane keeps no cluster settings")
+	}
+	cur, err := a.settings.Store.ClusterSettings(ctx)
+	if err != nil {
+		return err
+	}
+	doc, err := settings.FromBytes("settings", []byte(cur.Body))
+	if err != nil {
+		return err
+	}
+	if n := doc.Node(path); n != nil && n.Value == value {
+		return nil
+	}
+	if err := doc.SetYAML(path, value); err != nil {
+		return err
+	}
+	b, err := doc.Bytes()
+	if err != nil {
+		return err
+	}
+	if err := a.settings.Check(b); err != nil {
+		return err
+	}
+	_, err = a.settings.Store.PutClusterSettings(ctx, cur.Version, string(b), by, note)
+	return err
+}
+
+func (a *API) registerPresets(mux Mux) {
+	mux.HandleFunc("GET /api/v1/presets", func(w http.ResponseWriter, r *http.Request) {
+		v, err := a.Presets(r.Context())
+		if err != nil {
+			writeError(w, presetStatus(err), err.Error())
+			return
+		}
+		writeJSON(w, http.StatusOK, v)
+	})
+	mux.HandleFunc("POST /api/v1/presets/{name}", func(w http.ResponseWriter, r *http.Request) {
+		if err := a.AddPreset(r.Context(), r.PathValue("name"), actorOf(r)); err != nil {
+			writeError(w, presetStatus(err), err.Error())
+			return
+		}
+		writeJSON(w, http.StatusOK, ModelAdded{Added: r.PathValue("name")})
+	})
+	mux.HandleFunc("PUT /api/v1/presets/auto", func(w http.ResponseWriter, r *http.Request) {
+		var req PresetsAutoRequest
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			writeError(w, http.StatusBadRequest, err.Error())
+			return
+		}
+		if err := a.SetAutoPresets(r.Context(), req.On, actorOf(r)); err != nil {
+			writeError(w, presetStatus(err), err.Error())
+			return
+		}
+		v, err := a.Presets(r.Context())
+		if err != nil {
+			writeError(w, presetStatus(err), err.Error())
+			return
+		}
+		writeJSON(w, http.StatusOK, v)
+	})
+}
+
+// errNoSuchPreset is a name no preset has.
+var errNoSuchPreset = errors.New("no preset of that name")
+
+func presetStatus(err error) int {
+	switch {
+	case errors.Is(err, errPresetsUnavailable):
+		return http.StatusNotImplemented
+	case errors.Is(err, errNoSuchPreset):
+		return http.StatusNotFound
+	default:
+		return http.StatusBadRequest
+	}
+}

internal/control/adminapi/presets_test.go

@@ -0,0 +1,141 @@
+package adminapi
+
+import (
+	"net/http"
+	"path/filepath"
+	"slices"
+	"strings"
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/catalog"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/inventory"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
+)
+
+func v100Node(id string) inventory.Node {
+	return inventory.Node{ID: id, State: inventory.Ready, AgentVersion: "v1", GPUs: []discovery.GPU{{
+		Index: 0, Name: "Tesla V100-SXM2-32GB", MemoryTotalMB: 32768, ComputeCapability: "7.0"}}}
+}
+
+func presetsAPI(t *testing.T, models []catalog.Model, cfg PresetConfig, nodes ...inventory.Node) (*API, *fakeModels, *store.DB) {
+	t.Helper()
+	a, _ := setup(t, models, nodes...)
+	st, err := store.OpenSQLite(t.Context(), filepath.Join(t.TempDir(), "p.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = st.Close() })
+	fm := &fakeModels{}
+	a.SetModels(fm)
+	a.SetPresets(st, func() PresetConfig { return cfg })
+	a.SetSettings(&Settings{Store: st, Check: func([]byte) error { return nil }})
+	return a, fm, st
+}
+
+func TestTheLeaderAddsThePresetsANodeFitsAndNoOtherWhere(t *testing.T) {
+	// A customer's portal had no pictures or 3D pages: nobody had written a
+	// definition for either, on a cluster with a V100 that runs both.
+	a, fm, st := presetsAPI(t, testModels(), PresetConfig{Auto: true, ComfyUI: "0.39.2"}, v100Node("p-g3"))
+	added, err := a.PresetsPass(t.Context())
+	if err != nil || !slices.Equal(added, []string{"flux-schnell", "triposr"}) {
+		t.Fatalf("added %v %v", added, err)
+	}
+	if !slices.Equal(fm.actors, []string{store.PresetAdder, store.PresetAdder}) {
+		t.Errorf("added by %v", fm.actors)
+	}
+	states, _ := st.PresetStates(t.Context())
+	if states["triposr"].AddedBy != store.PresetAdder || states["triposr"].AddedAt.IsZero() {
+		t.Errorf("state %+v", states["triposr"])
+	}
+	events, _ := st.AuditEvents(t.Context(), store.AuditFilter{Limit: 10})
+	if len(events) != 2 || events[0].Actor != store.PresetAdder || !strings.Contains(events[0].Detail, "v100-32g") {
+		t.Errorf("audit %+v", events)
+	}
+}
+
+func TestAPresetIsNotAddedByItselfWhereItShouldNotBe(t *testing.T) {
+	picture := catalog.Model{Name: "sdxl", Source: "/w/sdxl.safetensors", ComfyUI: &catalog.ComfyUI{Workflow: "flux-schnell"},
+		Profiles: []catalog.Profile{{Name: "p", Engine: catalog.EngineComfyUI, GPUClass: "v100-32g", TP: 1}}}
+	cases := []struct {
+		name   string
+		models []catalog.Model
+		cfg    PresetConfig
+		nodes  []inventory.Node
+		want   map[string]string // preset -> part of why it is not added
+	}{
+		{"auto off", testModels(), PresetConfig{Auto: false, ComfyUI: "0.39.2"}, []inventory.Node{v100Node("g")},
+			map[string]string{"flux-schnell": "presets.auto is off", "triposr": "presets.auto is off"}},
+		{"no ComfyUI", testModels(), PresetConfig{Auto: true}, []inventory.Node{v100Node("g")},
+			map[string]string{"triposr": "engines.comfyui"}},
+		{"no card", testModels(), PresetConfig{Auto: true, ComfyUI: "0.39.2"}, nil,
+			map[string]string{"triposr": "no node has a card"}},
+		{"a picture model already", append(testModels(), picture), PresetConfig{Auto: true, ComfyUI: "0.39.2"},
+			[]inventory.Node{v100Node("g")}, map[string]string{"flux-schnell": "sdxl"}},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			a, fm, _ := presetsAPI(t, c.models, c.cfg, c.nodes...)
+			v, err := a.Presets(t.Context())
+			if err != nil {
+				t.Fatal(err)
+			}
+			if v.ComfyUI != c.cfg.ComfyUI {
+				t.Errorf("comfyui %q", v.ComfyUI)
+			}
+			for _, p := range v.Presets {
+				if why, ok := c.want[p.Name]; ok && !strings.Contains(p.Blocked, why) {
+					t.Errorf("%s blocked %q, want it to say %q", p.Name, p.Blocked, why)
+				}
+			}
+			_, _ = a.PresetsPass(t.Context())
+			for _, m := range fm.added {
+				if _, blocked := c.want[m.Name]; blocked {
+					t.Errorf("%s was added", m.Name)
+				}
+			}
+		})
+	}
+}
+
+func TestAPresetRemovedStaysOutUntilAddedAgain(t *testing.T) {
+	a, fm, _ := presetsAPI(t, testModels(), PresetConfig{Auto: true, ComfyUI: "0.39.2"}, v100Node("g"))
+	if code := call(t, a, http.MethodDelete, "/api/v1/models/triposr", "", nil); code != http.StatusOK {
+		t.Fatalf("remove %d", code)
+	}
+	var v PresetsView
+	call(t, a, http.MethodGet, "/api/v1/presets", "", &v)
+	i := slices.IndexFunc(v.Presets, func(p PresetView) bool { return p.Name == "triposr" })
+	if i < 0 || !v.Presets[i].Declined || !strings.Contains(v.Presets[i].Blocked, "removed") {
+		t.Fatalf("after removal %+v", v.Presets)
+	}
+	added, _ := a.PresetsPass(t.Context())
+	if slices.Contains(added, "triposr") {
+		t.Error("a removed preset was added back by itself")
+	}
+	if code := call(t, a, http.MethodPost, "/api/v1/presets/triposr", "", nil); code != http.StatusOK {
+		t.Fatalf("add again %d", code)
+	}
+	if fm.added[len(fm.added)-1].Name != "triposr" {
+		t.Error("adding it again did not add it")
+	}
+	call(t, a, http.MethodGet, "/api/v1/presets", "", &v)
+	i = slices.IndexFunc(v.Presets, func(p PresetView) bool { return p.Name == "triposr" })
+	if v.Presets[i].Declined {
+		t.Error("adding it again left it declined")
+	}
+	if code := call(t, a, http.MethodPost, "/api/v1/presets/nope", "", nil); code != http.StatusNotFound {
+		t.Errorf("unknown preset %d", code)
+	}
+}
+
+func TestPresetsAutoIsTheClusterSetting(t *testing.T) {
+	a, _, st := presetsAPI(t, testModels(), PresetConfig{Auto: true, ComfyUI: "0.39.2"})
+	if code := call(t, a, http.MethodPut, "/api/v1/presets/auto", `{"on":false}`, nil); code != http.StatusOK {
+		t.Fatalf("put %d", code)
+	}
+	cur, _ := st.ClusterSettings(t.Context())
+	if !strings.Contains(cur.Body, "auto: false") {
+		t.Errorf("settings %q", cur.Body)
+	}
+}

internal/control/adminapi/routes.go

@@ -42,6 +42,13 @@ type Route struct {
 	Status int
 	// CSV is set when the answer is CSV unless JSON is asked for.
 	CSV bool
+	// Form is a request sent as multipart/form-data — a file uploaded —
+	// whose fields are Request's.
+	Form bool
+	// Stream is an answer that may come as server-sent events instead.
+	Stream bool
+	// Binary is the type of an answer that is a file, not JSON.
+	Binary string
 }
 
 // Param is a query parameter.
@@ -58,10 +65,12 @@ type Param struct {
 // before them and their name.
 var PathParams = map[string]string{
 	"models/{name}":     "The model's name in the catalog.",
+	"presets/{name}":    "The preset's name, as `llmgw ctl model presets` lists it.",
 	"nodes/{id}":        "The node's ID, as `llmgw ctl nodes` lists it.",
 	"jobs/{id}":         "The job's ID, as starting it answered.",
 	"runs/{id}":         "The quality run's ID, as starting it answered.",
 	"requests/{id}":     "The request's ID: the x-request-id a client was answered with.",
+	"client-jobs/{id}":  "The job's ID, job_….",
 	"fabrics/{id}":      "The physical fabric's ID, as GET /api/v1/fabrics lists it.",
 	"quotas/{scope}":    "The scope: org:NAME, team:ORG/TEAM, project:ORG/TEAM/PROJECT, or their IDs after the colon.",
 	"federation/{peer}": "The federation peer's name, as `llmgw ctl federation list` lists it.",
@@ -128,6 +137,12 @@ var Routes = []Route{
 		Request: CollectRequest{}, OptionalBody: true, Response: []CollectResult{}},
 
 	// The catalog.
+	{Method: "GET", Path: "/api/v1/presets", Summary: "The models that come with llmgw: whether each fits this cluster, is in the catalog, was declined",
+		Response: PresetsView{}},
+	{Method: "POST", Path: "/api/v1/presets/{name}", Summary: "Add a preset to the catalog, and clear its decline",
+		Response: ModelAdded{}},
+	{Method: "PUT", Path: "/api/v1/presets/auto", Summary: "Turn on or off the adding of presets when a node fits them",
+		Request: PresetsAutoRequest{}, Response: PresetsView{}},
 	{Method: "GET", Path: "/api/v1/models", Summary: "Every model, with its replicas and state",
 		Response: []ModelView{}},
 	{Method: "POST", Path: "/api/v1/models", Summary: "Add a model to the catalog",
@@ -397,6 +412,14 @@ var Routes = []Route{
 			{Name: "format", Description: "json for JSON; CSV otherwise."},
 		},
 		Response: []store.ExportRow{}, CSV: true},
+	{Method: "GET", Path: "/api/v1/client-jobs", Summary: "Jobs clients asked for — 3D models — of every owner, newest first",
+		Query: []Param{
+			{Name: "status", Description: "Only jobs in this status: queued, running, cancelling, completed, failed, cancelled, expired."},
+			{Name: "limit", Type: "integer", Description: "The most jobs to answer with; 50 when absent."},
+		},
+		Response: []JobView{}},
+	{Method: "GET", Path: "/api/v1/client-jobs/{id}", Summary: "One job a client asked for", Response: JobView{}},
+	{Method: "POST", Path: "/api/v1/client-jobs/{id}/cancel", Summary: "Stop a job, in the engine's queue too", Response: JobView{}},
 	{Method: "GET", Path: "/api/v1/requests/{id}", Summary: "What one request went through",
 		Response: RequestView{}},
 	{Method: "GET", Path: "/api/v1/requests/{id}/body", Summary: "A kept request and its answer",

internal/control/adminapi/weights.go

@@ -30,7 +30,7 @@ type OrphanView struct {
 func (a *API) Orphans() []OrphanView {
 	var wanted []string
 	for _, m := range a.ctl.Catalog().Models() {
-		wanted = append(wanted, m.Source)
+		wanted = append(wanted, m.WeightSources()...)
 		// A model's adapters are its weights too; collecting them would
 		// leave replicas that cannot restart.
 		for _, ad := range m.Adapters {

internal/control/catalog/catalog.go

@@ -7,13 +7,17 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"maps"
 	"net/url"
+	"path"
+	"regexp"
 	"slices"
 	"strings"
 	"time"
 
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/engines"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/comfy"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/control/facility"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/control/placement"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/guard"
@@ -172,6 +176,12 @@ type Profile struct {
 	// 0.10.2. Empty takes whatever version the node has.
 	EngineVersion string `json:"engine_version,omitempty" koanf:"engine_version"`
 	GPUClass      string `json:"gpu_class,omitempty" koanf:"gpu_class"`
+	// Source is the weights this profile loads, when not the model's: an
+	// embedding model served by vLLM from its repository on a card and by
+	// llama.cpp from a GGUF on CPUs is one model with two sources. Empty
+	// loads the model's. Updates and canaries move the model's source; a
+	// profile with its own keeps it.
+	Source string `json:"source,omitempty" koanf:"source"`
 
 	TP int `json:"tp,omitempty" koanf:"tp"`
 	PP int `json:"pp,omitempty" koanf:"pp"`
@@ -269,6 +279,14 @@ type Profile struct {
 	// which the router's hashing assumes; arguments overriding either leave
 	// the index empty, and the agent says so in its log.
 	KVEvents bool `json:"kv_events,omitempty" koanf:"kv_events"`
+
+	// GPU says what card the profile needs, in place of naming its class:
+	// it stands for every class in the cluster that meets it. A catalog
+	// entry written once then places sensibly on any site's cards.
+	GPU *GPUNeed `json:"gpu,omitempty" koanf:"gpu"`
+	// ComfyUI is this profile's own workflow, checkpoint and nodes, over the
+	// model's: an fp8 workflow where the card has fp8, fp16 where it has not.
+	ComfyUI *ProfileComfyUI `json:"comfyui,omitempty" koanf:"comfyui"`
 }
 
 // CPUOnly reports whether this profile needs no GPUs.
@@ -277,7 +295,7 @@ type Profile struct {
 // actually serve without a card are allowed to leave it out — otherwise an
 // omitted class would quietly become a replica placed on a machine with no
 // hardware to run it.
-func (p Profile) CPUOnly() bool { return p.GPUClass == "" && cpuCapable(p.Engine) }
+func (p Profile) CPUOnly() bool { return p.GPUClass == "" && p.GPU == nil && cpuCapable(p.Engine) }
 
 // cpuCapable reports whether an engine can serve a model without a GPU.
 //
@@ -321,6 +339,13 @@ type Model struct {
 	// prompts leave the cluster, so which keys may name it is worth an
 	// allowlist.
 	External *External `json:"external,omitempty" koanf:"external"`
+	// ComfyUI is how a model whose profiles run engine comfyui makes its
+	// pictures: the workflow, and the file it loads.
+	ComfyUI *ComfyUI `json:"comfyui,omitempty" koanf:"comfyui"`
+	// License is the terms of what the model makes, for a model whose
+	// output somebody ships: shown with every result and written into a
+	// mesh.
+	License *License `json:"license,omitempty" koanf:"license"`
 	// Adapters are LoRA adapters served on this model's replicas, each asked
 	// for by its own name as though it were a model. Every replica loads
 	// every adapter, applying one only to a request that names it — unless
@@ -363,6 +388,13 @@ type Model struct {
 	// Capabilities is what this model can do beyond plain completion.
 	Capabilities Capabilities `json:"capabilities,omitempty" koanf:"capabilities"`
 
+	// QueryPrefix is put before a question an embedding model embeds for a
+	// knowledge-base search; documents are embedded without it. Models
+	// trained with an instruction on the query side want it, Qwen3-Embedding
+	// "Instruct: Given a web search query, retrieve relevant passages that
+	// answer the query\nQuery: " for one.
+	QueryPrefix string `json:"query_prefix,omitempty" koanf:"query_prefix"`
+
 	// Role "guard" is a model that judges the gateway's traffic for the
 	// guardrails rather than serving clients: hidden from /v1/models and the
 	// chat page, refused to any key that names it, critical by default, and
@@ -377,6 +409,10 @@ type Model struct {
 	// say that the repository has published different weights since, and
 	// move the model to them.
 	Origin *Origin `json:"origin,omitempty" koanf:"origin"`
+
+	// Shared is set on an environment's hidden entry only: the members its
+	// replica answers for. Made by the catalog, never written.
+	Shared *SharedComfy `json:"shared,omitempty" koanf:"-"`
 }
 
 // RoleGuard is a judge model's role.
@@ -450,6 +486,287 @@ type Capabilities struct {
 	Tools      bool `json:"tools,omitempty" koanf:"tools"`
 	Vision     bool `json:"vision,omitempty" koanf:"vision"`
 	Embeddings bool `json:"embeddings,omitempty" koanf:"embeddings"`
+	// Images is a model that makes pictures, asked for at
+	// /v1/images/generations. Implied by an external model whose API is
+	// ComfyUI's.
+	Images bool `json:"images,omitempty" koanf:"images"`
+	// Meshes is a model that makes 3D models from a picture, asked for as a
+	// job at /v1/3d/generations. Implied by a ComfyUI model whose output is
+	// meshes.
+	Meshes bool `json:"meshes,omitempty" koanf:"meshes"`
+}
+
+// The kinds of thing a ComfyUI model makes.
+const (
+	OutputPictures = "pictures"
+	OutputMeshes   = "meshes"
+)
+
+// comfyOutput is what a ComfyUI model makes: pictures unless it says.
+func (m Model) comfyOutput() string {
+	out := ""
+	switch {
+	case m.External != nil:
+		out = m.External.Output
+	case m.ComfyUI != nil:
+		out = m.ComfyUI.Output
+	}
+	if out == "" {
+		return OutputPictures
+	}
+	return out
+}
+
+// MakesImages reports whether a model answers /v1/images/generations.
+func (m Model) MakesImages() bool {
+	return m.Capabilities.Images || m.ServesComfyUI() && m.comfyOutput() == OutputPictures
+}
+
+// MakesMeshes reports whether a model answers /v1/3d/generations.
+func (m Model) MakesMeshes() bool {
+	return m.Capabilities.Meshes || m.ServesComfyUI() && m.comfyOutput() == OutputMeshes
+}
+
+// License is the terms what a model makes comes under: said beside every
+// result, and written into a mesh, which travels without the API.
+type License struct {
+	// ID names the licence for a machine: an SPDX identifier where there is
+	// one (MIT, Apache-2.0, CC-BY-NC-4.0), else a lowercase name of the
+	// licence's own (stability-community, tencent-hunyuan-community). What a
+	// person's or a site's choice of licences matches on. Name is for people.
+	ID string `json:"id,omitempty" koanf:"id"`
+	// Name is the licence's own: MIT, Apache-2.0.
+	Name string `json:"name" koanf:"name"`
+	URL  string `json:"url,omitempty" koanf:"url"`
+	// Notice is what must accompany what was made: attribution, terms on
+	// the output, what the weights were trained on.
+	Notice string `json:"notice,omitempty" koanf:"notice"`
+	// Commercial says whether what is made may be used commercially: nil
+	// is not said, which is not the same as yes.
+	Commercial *bool `json:"commercial,omitempty" koanf:"commercial"`
+	// ExcludedRegions are where the licence grants nothing: ISO 3166 codes,
+	// and EU for the union (Hunyuan's: EU, UK, KR).
+	ExcludedRegions []string `json:"excluded_regions,omitempty" koanf:"excluded_regions"`
+	// RevenueCapUSD is the yearly revenue above which the licence asks for
+	// another agreement (Stability's community licence: 1000000). Zero is
+	// none.
+	RevenueCapUSD int64 `json:"revenue_cap_usd,omitempty" koanf:"revenue_cap_usd"`
+	// Attribution is what a product using the output must show: "Powered by
+	// Stability AI".
+	Attribution string `json:"attribution,omitempty" koanf:"attribution"`
+}
+
+var (
+	licenseID = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9.+-]{0,63}$`)
+	regionID  = regexp.MustCompile(`^[A-Z]{2}$`)
+)
+
+func (l License) validate(model string) error {
+	if strings.TrimSpace(l.Name) == "" {
+		return fmt.Errorf("model %q: license.name is required: a licence nobody can name is none", model)
+	}
+	if l.ID != "" && !licenseID.MatchString(l.ID) {
+		return fmt.Errorf("model %q: license.id %q is not an SPDX-style identifier (letters, digits, '.', '+', '-')", model, l.ID)
+	}
+	for _, r := range l.ExcludedRegions {
+		if !regionID.MatchString(r) {
+			return fmt.Errorf("model %q: license.excluded_regions %q is not an ISO 3166 code in capitals (EU for the union)", model, r)
+		}
+	}
+	if l.RevenueCapUSD < 0 {
+		return fmt.Errorf("model %q: license.revenue_cap_usd is negative", model)
+	}
+	return nil
+}
+
+// EngineComfyUI is the engine that runs ComfyUI on a node.
+const EngineComfyUI = "comfyui"
+
+// ServesComfyUI reports whether a model is made by ComfyUI, on the
+// cluster's own nodes or on a server outside it.
+func (m Model) ServesComfyUI() bool {
+	if m.External != nil {
+		return m.External.API == APIComfyUI
+	}
+	return len(m.Profiles) > 0 && m.Profiles[0].Engine == EngineComfyUI
+}
+
+// ComfyUI is a ComfyUI model's workflow and checkpoint.
+type ComfyUI struct {
+	// Workflow is a built-in's name (flux-schnell, the default, or
+	// flux-dev) or a JSON file on the control plane, in ComfyUI's API
+	// format.
+	Workflow string `json:"workflow,omitempty" koanf:"workflow"`
+	// Checkpoint is the file the workflow's {{checkpoint}} names: the
+	// source's own name unless set, which a source that is a set of files
+	// must.
+	Checkpoint string `json:"checkpoint,omitempty" koanf:"checkpoint"`
+	// Output is what the workflow makes: pictures (the default), asked for
+	// at /v1/images/generations; meshes, asked for as a job at
+	// /v1/3d/generations from a picture; or video, audio or files. Every
+	// kind is asked for as a job at /v1/workflows/runs too.
+	Output string `json:"output,omitempty" koanf:"output"`
+	// Inputs are what the workflow takes from a request at
+	// /v1/workflows/runs, each the placeholder of its name.
+	Inputs []Input `json:"inputs,omitempty" koanf:"inputs"`
+	// Nodes are custom nodes the workflow needs, put in each replica's own
+	// custom_nodes at the commit named.
+	Nodes []CustomNode `json:"nodes,omitempty" koanf:"nodes"`
+	// HuggingFaceRepo is the repository a custom node loads the weights by
+	// name from (Stable Fast 3D's loader asks for stabilityai/stable-fast-3d):
+	// the replica's weights are shown to the node there, in the Hugging Face
+	// cache of the engines' user, so nothing is fetched and no token is
+	// needed when it runs.
+	HuggingFaceRepo string `json:"huggingface_repo,omitempty" koanf:"huggingface_repo"`
+	// Environment names the models that may share one ComfyUI replica: every
+	// model of an environment agrees on the custom nodes they both name, so
+	// one replica can carry all of them and ComfyUI moves between their
+	// weights itself. Empty is an environment of the model alone.
+	Environment string `json:"environment,omitempty" koanf:"environment"`
+}
+
+// CustomNode is a ComfyUI node from a git repository.
+type CustomNode struct {
+	// Repo is the repository, https only.
+	Repo string `json:"repo" koanf:"repo"`
+	// Commit is the full commit the node is used at: a branch moves, and a
+	// node that changed under a model is a model that changed unasked.
+	Commit string `json:"commit" koanf:"commit"`
+	// Requirements are the PyPI packages the node needs, by name and version
+	// range only. They are installed beside the replica, never into
+	// ComfyUI's environment: a package named here at the range named, and
+	// every other one at the version ComfyUI already runs. One named here
+	// is first on ComfyUI's path, so its range must suit ComfyUI too.
+	Requirements []string `json:"requirements,omitempty" koanf:"requirements"`
+	// Build are directories of the repository that are Python packages to
+	// be compiled rather than downloaded: C++ and CUDA extensions no index
+	// has (Stable Fast 3D's texture_baker and uv_unwrapper). Each is built
+	// as a wheel with ComfyUI's Python for the card the replica runs on,
+	// kept on the node for the next replica on the same kind of card, and
+	// installed beside the replica like its requirements.
+	Build []string `json:"build,omitempty" koanf:"build"`
+}
+
+// NodesEnv carries a ComfyUI model's custom nodes to the agent, which hands
+// them to the gate.
+const NodesEnv = "LLMGW_COMFYUI_NODES"
+
+// HFRepoEnv carries the repository a node loads the weights by name from.
+const HFRepoEnv = "LLMGW_COMFYUI_HF_REPO"
+
+// SharedModelsEnv carries a shared replica's members — name, weights source,
+// repository — to the agent, which fetches each and hands the gate where
+// they landed.
+const SharedModelsEnv = "LLMGW_COMFYUI_MODELS"
+
+var hfRepo = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9._-]*/[A-Za-z0-9][A-Za-z0-9._-]*$`)
+
+var (
+	fullCommit  = regexp.MustCompile(`^[0-9a-f]{40}$`)
+	packageSpec = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9._-]*(\[[A-Za-z0-9,._-]+\])?\s*([<>=!~]=?\s*[A-Za-z0-9.*+!_-]+\s*,?\s*)*$`)
+)
+
+func (n CustomNode) validate(model string) error {
+	u, err := url.Parse(n.Repo)
+	if err != nil || u.Scheme != "https" || u.Host == "" || u.User != nil {
+		return fmt.Errorf("model %q: custom node %q is not an https repository", model, n.Repo)
+	}
+	if !fullCommit.MatchString(n.Commit) {
+		return fmt.Errorf("model %q: custom node %s needs its full commit (40 hex), not %q: a branch moves",
+			model, n.Repo, n.Commit)
+	}
+	for _, b := range n.Build {
+		clean := path.Clean(b)
+		if b == "" || path.IsAbs(b) || clean == "." || clean == ".." || strings.HasPrefix(clean, "../") || strings.ContainsAny(b, "\\ ") {
+			return fmt.Errorf("model %q: custom node %s build %q is not a directory inside the repository", model, n.Repo, b)
+		}
+	}
+	for _, r := range n.Requirements {
+		// A package and a version range: an option or a URL would install
+		// from somewhere other than PyPI.
+		if !packageSpec.MatchString(strings.TrimSpace(r)) {
+			return fmt.Errorf("model %q: custom node %s requirement %q is not a package with a version range", model, n.Repo, r)
+		}
+	}
+	return nil
+}
+
+// ComfyWorkflow is what a ComfyUI model's replicas are sent: the workflow
+// as the catalog names it, and the checkpoint it loads.
+func (m Model) ComfyWorkflow() (workflow, checkpoint string) {
+	if m.External != nil {
+		return m.External.Workflow, m.External.Model
+	}
+	if m.ComfyUI != nil {
+		workflow, checkpoint = m.ComfyUI.Workflow, m.ComfyUI.Checkpoint
+	}
+	if checkpoint == "" && !strings.HasSuffix(m.Source, "/") {
+		checkpoint = path.Base(strings.TrimPrefix(m.Source, "hf:"))
+	}
+	return workflow, checkpoint
+}
+
+// checkWorkflow refuses a workflow that is neither a built-in nor a file.
+func checkWorkflow(model, w string) error {
+	// A file is read where the router runs; a name is checked here.
+	if w != "" && !strings.ContainsAny(w, "/.") && !slices.Contains(comfy.Builtins(), w) {
+		return fmt.Errorf("model %q: no built-in workflow %q (there are %s; or name a JSON file)",
+			model, w, strings.Join(comfy.Builtins(), ", "))
+	}
+	return nil
+}
+
+func (m Model) validateComfyUI() error {
+	comfyProfiles := 0
+	for _, p := range m.Profiles {
+		if p.Engine == EngineComfyUI {
+			comfyProfiles++
+		}
+	}
+	if comfyProfiles == 0 {
+		if m.ComfyUI != nil {
+			return fmt.Errorf("model %q: comfyui: is for a model whose profiles run engine comfyui", m.Name)
+		}
+		return nil
+	}
+	if comfyProfiles != len(m.Profiles) {
+		return fmt.Errorf("model %q: every profile runs engine comfyui or none does: "+
+			"a request for pictures cannot be answered by an engine that writes text", m.Name)
+	}
+	if len(m.Adapters) > 0 {
+		return fmt.Errorf("model %q: ComfyUI serves no adapters", m.Name)
+	}
+	var w string
+	if m.ComfyUI != nil {
+		w = m.ComfyUI.Workflow
+	}
+	if err := checkWorkflow(m.Name, w); err != nil {
+		return err
+	}
+	if m.ComfyUI != nil {
+		for _, n := range m.ComfyUI.Nodes {
+			if err := n.validate(m.Name); err != nil {
+				return err
+			}
+		}
+	}
+	if err := validOutput(m.Name, m.comfyOutput()); err != nil {
+		return err
+	}
+	if m.ComfyUI != nil && m.ComfyUI.HuggingFaceRepo != "" && !hfRepo.MatchString(m.ComfyUI.HuggingFaceRepo) {
+		return fmt.Errorf("model %q: comfyui.huggingface_repo %q is not owner/name", m.Name, m.ComfyUI.HuggingFaceRepo)
+	}
+	if out := m.comfyOutput(); out != OutputPictures && w == "" {
+		return fmt.Errorf("model %q: a model that makes %s names its workflow: no built-in makes them", m.Name, out)
+	}
+	if err := validateInputs(m.Name, m.ComfyInputs()); err != nil {
+		return err
+	}
+	if _, ckpt := m.ComfyWorkflow(); ckpt == "" {
+		return fmt.Errorf("model %q: its source is a set of files, so comfyui.checkpoint must name the one the workflow loads",
+			m.Name)
+	}
+	return nil
 }
 
 // Catalog is the set of models the cluster should serve.
@@ -470,6 +787,9 @@ func New(models []Model) (*Catalog, error) {
 	}
 
 	for i := range models {
+		if models[i].IsEnvironment() {
+			continue // the catalog's own, made again below
+		}
 		m := models[i].normalize()
 		if err := m.validate(); err != nil {
 			return nil, err
@@ -543,6 +863,25 @@ func New(models []Model) (*Catalog, error) {
 		}
 		canaryOf[target.Name] = name
 	}
+	envs, err := c.environments()
+	if err != nil {
+		return nil, err
+	}
+	for _, e := range envs {
+		if len(e.Models) < 2 {
+			continue
+		}
+		var members []Model
+		for _, n := range e.Models {
+			members = append(members, c.models[n])
+		}
+		em := envModel(e, members)
+		if _, clash := c.models[em.Name]; clash {
+			return nil, fmt.Errorf("model %q: the name is the hidden entry of environment %q", em.Name, e.Name)
+		}
+		c.models[em.Name] = em
+		c.order = append(c.order, em.Name)
+	}
 	return c, nil
 }
 
@@ -658,9 +997,15 @@ func (m Model) normalize() Model {
 	// repository it names: the engine downloads a repository id itself,
 	// where the page was fetched as one file of HTML and failed at start.
 	if repo, ok := repositoryPage(m.Source); ok && len(m.Profiles) > 0 &&
-		!slices.ContainsFunc(m.Profiles, func(p Profile) bool { return p.Engine == "llamacpp" }) {
+		!slices.ContainsFunc(m.Profiles, func(p Profile) bool { return p.Engine == "llamacpp" && p.Source == "" }) {
 		m.Source = repo
 	}
+	for i := range m.Profiles {
+		p := &m.Profiles[i]
+		if repo, ok := repositoryPage(p.Source); ok && p.Engine != "llamacpp" {
+			p.Source = repo
+		}
+	}
 	return m
 }
 
@@ -671,15 +1016,31 @@ func (m Model) validate() error {
 	if m.Source == "" {
 		return fmt.Errorf("model %q: source is required", m.Name)
 	}
-	if repo, ok := repositoryPage(m.Source); ok {
-		// A page, not weights: a node fetches the HTML as one file and the
-		// engine fails at start, on a path that looks right. For vLLM it was
-		// read as the repository id when the model was made; only a model
-		// llama.cpp runs is left here, which needs a file.
+	if m.License != nil {
+		if err := m.License.validate(m.Name); err != nil {
+			return err
+		}
+	}
+	// A page, not weights: a node fetches the HTML as one file and the
+	// engine fails at start, on a path that looks right. For vLLM it was
+	// read as the repository id when the model was made; only a source
+	// llama.cpp loads is left here, which needs a file.
+	if repo, ok := repositoryPage(m.Source); ok && (len(m.Profiles) == 0 ||
+		slices.ContainsFunc(m.Profiles, func(p Profile) bool { return p.Engine == "llamacpp" && p.Source == "" })) {
 		return fmt.Errorf("model %q: source %s is a Hugging Face repository page, not a file; "+
 			"llama.cpp needs a .gguf: mirror one and use its source (repository %s)",
 			m.Name, m.Source, repo)
 	}
+	for _, p := range m.Profiles {
+		if repo, ok := repositoryPage(p.Source); ok {
+			return fmt.Errorf("model %q profile %q: source %s is a Hugging Face repository page, not a file; "+
+				"llama.cpp needs a .gguf: mirror one and use its source (repository %s)",
+				m.Name, p.Name, p.Source, repo)
+		}
+		if p.Source != "" && m.External != nil {
+			return fmt.Errorf("model %q profile %q: an external model has no profiles to give a source", m.Name, p.Name)
+		}
+	}
 	if err := validateAdapters(m); err != nil {
 		return err
 	}
@@ -690,6 +1051,9 @@ func (m Model) validate() error {
 	} else if len(m.Profiles) == 0 {
 		return fmt.Errorf("model %q: at least one profile is required", m.Name)
 	}
+	if err := m.validateComfyUI(); err != nil {
+		return err
+	}
 	if m.Owner != "" && !validOwner(m.Owner) {
 		return fmt.Errorf("model %q: owner %q is not org:ID, team:ID or project:ID", m.Name, m.Owner)
 	}
@@ -771,10 +1135,18 @@ func (m Model) validate() error {
 				return fmt.Errorf("model %q profile %q: keep_within: %w", m.Name, p.Name, err)
 			}
 		}
-		if p.GPUClass == "" && !cpuCapable(p.Engine) {
-			return fmt.Errorf("model %q profile %q: gpu_class is required for engine %q",
+		if err := p.validateHardware(m); err != nil {
+			return err
+		}
+		if p.GPUClass == "" && p.GPU == nil && !cpuCapable(p.Engine) {
+			return fmt.Errorf("model %q profile %q: gpu_class is required for engine %q, or gpu: the card it needs",
 				m.Name, p.Name, p.Engine)
 		}
+		if p.GPU != nil {
+			// Its class is known only when it is placed; what can be checked
+			// of a class waits for then.
+			continue
+		}
 		if p.CPUOnly() {
 			if p.Nodes > 1 {
 				return fmt.Errorf("model %q profile %q: a CPU profile cannot span %d nodes",
@@ -817,7 +1189,7 @@ func (m Model) validate() error {
 				return fmt.Errorf("model %q profile %q: trtllm runs a replica on one node; "+
 					"use vllm or sglang for a %d-node replica", m.Name, p.Name, p.Nodes)
 			}
-			if strings.HasSuffix(strings.ToLower(strings.TrimSuffix(m.Source, "/")), ".gguf") {
+			if strings.HasSuffix(strings.ToLower(strings.TrimSuffix(m.SourceOf(p), "/")), ".gguf") {
 				return fmt.Errorf("model %q profile %q: trtllm loads a Hugging Face checkpoint, not a .gguf; "+
 					"serve a GGUF with llamacpp", m.Name, p.Name)
 			}
@@ -885,10 +1257,16 @@ func (c *Catalog) AliasesOf(name string) []string {
 	return slices.Clone(m.Aliases)
 }
 
-// PlacementProfiles converts a model's profiles into placement's view.
+// PlacementProfiles converts a model's profiles into placement's view. A
+// profile that names its card by need is left out: with no class it would
+// read to placement as one that needs no GPU. PlacementProfilesFor gives
+// it the classes it stands for.
 func (m Model) PlacementProfiles() []placement.Profile {
 	out := make([]placement.Profile, 0, len(m.Profiles))
 	for _, p := range m.Profiles {
+		if p.GPU != nil {
+			continue
+		}
 		out = append(out, placement.Profile{
 			Name:          p.Name,
 			Engine:        p.Engine,
@@ -903,19 +1281,75 @@ func (m Model) PlacementProfiles() []placement.Profile {
 			CPUCores:      p.CPUCores,
 			PowerWatts:    p.PowerWatts,
 			KeepWithin:    facility.Level(strings.ToLower(strings.TrimSpace(p.KeepWithin))),
-			// The model's source, so placement can prefer nodes that already
+			// The profile's source, so placement can prefer nodes that already
 			// hold the weights rather than one that must first move them.
-			Source: m.Source,
+			Source: m.SourceOf(p),
 		})
 	}
 	return out
 }
 
+// SourceOf is the weights a profile loads: its own, or the model's.
+func (m Model) SourceOf(p Profile) string {
+	if p.Source != "" {
+		return p.Source
+	}
+	return m.Source
+}
+
+// WeightSources are every source a model's replicas may load: the model's
+// and each profile's of its own, once each. What a node must not have
+// collected from under it.
+func (m Model) WeightSources() []string {
+	out := []string{}
+	if m.Source != "" {
+		out = append(out, m.Source)
+	}
+	for _, p := range m.Profiles {
+		if p.Source != "" && !slices.Contains(out, p.Source) {
+			out = append(out, p.Source)
+		}
+	}
+	return out
+}
+
 // EngineProfile converts a catalog profile into the engine adapter's view.
 func (m Model) EngineProfile(name string) (engines.Profile, bool) {
-	for _, p := range m.Profiles {
-		if p.Name != name {
-			continue
+	if p, ok := m.ProfileByName(name); ok {
+		env := p.Env
+		if nodes := m.ComfyNodesFor(p); p.Engine == EngineComfyUI && len(nodes) > 0 {
+			nodes, _ := json.Marshal(nodes)
+			env = maps.Clone(env)
+			if env == nil {
+				env = map[string]string{}
+			}
+			env[NodesEnv] = string(nodes)
+		}
+		if p.Engine == EngineComfyUI && m.Shared != nil {
+			// Every member's weights, for the node to fetch and the gate to
+			// link: one replica answers for all of them.
+			type member struct {
+				Name   string `json:"name"`
+				Source string `json:"source"`
+				HFRepo string `json:"hf_repo,omitempty"`
+			}
+			var ms []member
+			for _, sm := range m.Shared.Members {
+				ms = append(ms, member{Name: sm.Name, Source: sm.Source, HFRepo: sm.HFRepo})
+			}
+			b, _ := json.Marshal(ms)
+			env = maps.Clone(env)
+			if env == nil {
+				env = map[string]string{}
+			}
+			env[SharedModelsEnv] = string(b)
+		}
+		if p.Engine == EngineComfyUI && m.ComfyUI != nil && m.ComfyUI.HuggingFaceRepo != "" {
+			env = maps.Clone(env)
+			if env == nil {
+				env = map[string]string{}
+			}
+			env[HFRepoEnv] = m.ComfyUI.HuggingFaceRepo
 		}
 		return engines.Profile{
 			Name:            p.Name,
@@ -926,8 +1360,8 @@ func (m Model) EngineProfile(name string) (engines.Profile, bool) {
 			GPUsPerNode:     p.GPUsPerNode,
 			Nodes:           p.Nodes,
 			Args:            slices.Clone(p.Args),
-			Env:             p.Env,
-			ModelPath:       m.Source,
+			Env:             env,
+			ModelPath:       m.SourceOf(p),
 			ServedModelName: m.Name,
 			Adapters:        m.engineAdapters(),
 			KVEvents:        p.KVEvents,
@@ -948,13 +1382,23 @@ func (m Model) KVIndex() bool {
 	return false
 }
 
-// ProfileByName returns one of a model's profiles.
+// ProfileByName returns one of a model's profiles, or one a profile that
+// names its GPU by need stands for: "<profile>@<class>", with the class.
 func (m Model) ProfileByName(name string) (Profile, bool) {
 	for _, p := range m.Profiles {
 		if p.Name == name {
 			return p, true
 		}
 	}
+	base, class, ok := strings.Cut(name, "@")
+	if !ok || class == "" {
+		return Profile{}, false
+	}
+	for _, p := range m.Profiles {
+		if p.Name == base && p.GPU != nil {
+			return p.forClass(class), true
+		}
+	}
 	return Profile{}, false
 }
 
@@ -1094,8 +1538,22 @@ type External struct {
 	// than one written by hand. Such a model is named PEER/MODEL, comes and
 	// goes with the peer's own list, and is sent only while the peer is up.
 	Peer string `json:"peer,omitempty" koanf:"peer"`
+	// API is what the provider speaks: OpenAI's, unless this says comfyui —
+	// a ComfyUI server, asked for pictures at /v1/images/generations and
+	// sent the workflow below with the request's prompt in it. Model is then
+	// the checkpoint file the workflow loads, as ComfyUI lists it.
+	API string `json:"api,omitempty" koanf:"api"`
+	// Workflow is the ComfyUI workflow, in its API format: a built-in's name
+	// (flux-schnell, the default, or flux-dev) or a JSON file on the control
+	// plane.
+	Workflow string `json:"workflow,omitempty" koanf:"workflow"`
+	// Output is what it makes: pictures, or meshes (see ComfyUI.Output).
+	Output string `json:"output,omitempty" koanf:"output"`
 }
 
+// APIComfyUI is External.API for a ComfyUI server.
+const APIComfyUI = "comfyui"
+
 // IsPeer reports whether a model is offered by a federated cluster.
 func (m Model) IsPeer() bool { return m.External != nil && m.External.Peer != "" }
 
@@ -1110,6 +1568,29 @@ func (e *External) validate(model string, profiles int) error {
 	if strings.TrimSpace(e.Model) == "" {
 		return fmt.Errorf("model %q: external model needs the name the provider knows it by", model)
 	}
+	switch e.API {
+	case "", "openai":
+		if e.Workflow != "" || e.Output != "" {
+			return fmt.Errorf("model %q: a workflow and an output are for api: comfyui", model)
+		}
+	case APIComfyUI:
+		if e.Peer != "" {
+			return fmt.Errorf("model %q: a federated model speaks OpenAI's API, not ComfyUI's", model)
+		}
+		if err := checkWorkflow(model, e.Workflow); err != nil {
+			return err
+		}
+		if e.Output != "" {
+			if err := validOutput(model, e.Output); err != nil {
+				return err
+			}
+		}
+		if e.Output != "" && e.Output != OutputPictures && e.Workflow == "" {
+			return fmt.Errorf("model %q: a model that makes %s names its workflow: no built-in makes them", model, e.Output)
+		}
+	default:
+		return fmt.Errorf("model %q: external api %q is not openai or comfyui", model, e.API)
+	}
 	return nil
 }
 

internal/control/catalog/comfyui_test.go

@@ -0,0 +1,83 @@
+package catalog
+
+import (
+	"strings"
+	"testing"
+)
+
+func comfyModel(source string, c *ComfyUI, profiles ...Profile) Model {
+	if len(profiles) == 0 {
+		profiles = []Profile{{Name: "gpu", Engine: EngineComfyUI, GPUClass: "6000-24g", TP: 1}}
+	}
+	return Model{Name: "flux", Source: source, ComfyUI: c, Profiles: profiles}
+}
+
+func TestAComfyUIModelMakesPicturesFromItsSourcesFile(t *testing.T) {
+	cat, err := New([]Model{comfyModel("hf:Comfy-Org/flux1-schnell/flux1-schnell-fp8.safetensors", nil)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := cat.Resolve("flux")
+	if !m.MakesImages() || !m.ServesComfyUI() {
+		t.Error("a ComfyUI model does not say it makes pictures")
+	}
+	if w, ckpt := m.ComfyWorkflow(); w != "" || ckpt != "flux1-schnell-fp8.safetensors" {
+		t.Errorf("workflow %q, checkpoint %q", w, ckpt)
+	}
+}
+
+func TestAComfyUIModelIsRefusedWhatItCannotDo(t *testing.T) {
+	for name, c := range map[string]struct {
+		m    Model
+		want string
+	}{
+		"a set without a checkpoint": {comfyModel("https://mirror/flux-dev/v1/", nil), "comfyui.checkpoint"},
+		"an unknown workflow":        {comfyModel("/w/f.safetensors", &ComfyUI{Workflow: "sdxl"}), "no built-in workflow"},
+		"mixed engines": {comfyModel("/w/f.safetensors", nil,
+			Profile{Name: "a", Engine: EngineComfyUI, GPUClass: "6000-24g", TP: 1},
+			Profile{Name: "b", Engine: "vllm", GPUClass: "6000-24g", TP: 1}), "every profile"},
+		"comfyui settings without the engine": {Model{Name: "x", Source: "/w/x", ComfyUI: &ComfyUI{},
+			Profiles: []Profile{{Name: "a", Engine: "vllm", GPUClass: "6000-24g", TP: 1}}}, "engine comfyui"},
+		"no card": {comfyModel("/w/f.safetensors", nil, Profile{Name: "a", Engine: EngineComfyUI, TP: 1}), "gpu_class"},
+	} {
+		if _, err := New([]Model{c.m}); err == nil || !strings.Contains(err.Error(), c.want) {
+			t.Errorf("%s: %v", name, err)
+		}
+	}
+	ok := comfyModel("https://mirror/flux-dev/v1/", &ComfyUI{Workflow: "flux-dev", Checkpoint: "flux1-dev-fp8.safetensors"})
+	if _, err := New([]Model{ok}); err != nil {
+		t.Errorf("a set with its checkpoint named was refused: %v", err)
+	}
+}
+
+func TestACustomNodeIsPinnedAndItsPackagesArePackages(t *testing.T) {
+	node := func(n CustomNode) Model {
+		return comfyModel("hf:stabilityai/TripoSR/model.ckpt", &ComfyUI{Workflow: "w.json", Output: OutputMeshes,
+			Nodes: []CustomNode{n}})
+	}
+	ok := CustomNode{Repo: "https://github.com/flowtyone/ComfyUI-Flowty-TripoSR",
+		Commit: "0123456789abcdef0123456789abcdef01234567", Requirements: []string{"omegaconf", "trimesh>=4,<5", "scikit-image"}}
+	cat, err := New([]Model{node(ok)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := cat.Resolve("flux")
+	p, _ := m.EngineProfile("gpu")
+	if !strings.Contains(p.Env[NodesEnv], "ComfyUI-Flowty-TripoSR") || !m.MakesMeshes() || m.MakesImages() {
+		t.Errorf("env %v meshes %v pictures %v", p.Env, m.MakesMeshes(), m.MakesImages())
+	}
+	for name, n := range map[string]CustomNode{
+		"a branch":  {Repo: ok.Repo, Commit: "main"},
+		"http":      {Repo: "http://example.com/n", Commit: ok.Commit},
+		"an option": {Repo: ok.Repo, Commit: ok.Commit, Requirements: []string{"--index-url=https://evil"}},
+		"a url":     {Repo: ok.Repo, Commit: ok.Commit, Requirements: []string{"x @ https://evil/x.whl"}},
+	} {
+		if _, err := New([]Model{node(n)}); err == nil {
+			t.Errorf("%s: accepted", name)
+		}
+	}
+	noWorkflow := comfyModel("hf:a/b/c.ckpt", &ComfyUI{Output: OutputMeshes})
+	if _, err := New([]Model{noWorkflow}); err == nil || !strings.Contains(err.Error(), "names its workflow") {
+		t.Errorf("a mesh model without a workflow: %v", err)
+	}
+}

internal/control/catalog/environments.go

@@ -0,0 +1,172 @@
+package catalog
+
+import (
+	"fmt"
+	"regexp"
+	"slices"
+	"strings"
+)
+
+// Environments: the ComfyUI models that may share one replica.
+//
+// Every ComfyUI model used to run in a replica of its own, so two models on
+// one card took turns with a cold start each time: flux, then a mesh model,
+// then flux again, each loading ComfyUI and its weights from nothing. ComfyUI
+// itself moves between models' weights in one process; what keeps two models
+// out of one process is their custom nodes, which share one Python. An
+// environment is a set of models whose nodes can: the catalog checks it, and
+// placement may then run one replica for all of them.
+
+// Environment is one environment's models and what a replica of it carries.
+type Environment struct {
+	Name string `json:"name"`
+	// Models are the catalog models in it, in catalog order.
+	Models []string `json:"models"`
+	// Nodes are every custom node any of them names, once each.
+	Nodes []CustomNode `json:"nodes,omitempty"`
+	// Sources are every weights source its models load, once each: what a
+	// replica of it must have on its node.
+	Sources []string `json:"sources,omitempty"`
+}
+
+// ComfyEnvironment is the environment a ComfyUI model is in, or "" for one in
+// none, which is an environment of its own.
+func (m Model) ComfyEnvironment() string {
+	if m.ComfyUI == nil {
+		return ""
+	}
+	return m.ComfyUI.Environment
+}
+
+var envName = regexp.MustCompile(`^[a-z0-9][a-z0-9._-]{0,62}$`)
+
+// Environments are the catalog's named environments, by name.
+func (c *Catalog) Environments() []Environment {
+	envs, _ := c.environments()
+	return envs
+}
+
+// EnvironmentOf is the environment a model is in, when it is in a named one.
+func (c *Catalog) EnvironmentOf(model string) (Environment, bool) {
+	m, ok := c.Resolve(model)
+	if !ok || m.ComfyEnvironment() == "" {
+		return Environment{}, false
+	}
+	for _, e := range c.Environments() {
+		if e.Name == m.ComfyEnvironment() {
+			return e, true
+		}
+	}
+	return Environment{}, false
+}
+
+// environments builds the named environments and refuses one whose models
+// cannot share a replica: two commits of one node, or two ranges of one
+// package, of which one Python can hold only one.
+func (c *Catalog) environments() ([]Environment, error) {
+	byName := map[string]*Environment{}
+	var order []string
+	// Who brought each node and each package into each environment, to name
+	// both models when two disagree.
+	nodeFrom := map[string]map[string]string{} // env -> repo -> model
+	nodeAt := map[string]map[string]string{}   // env -> repo -> commit
+	pkgFrom := map[string]map[string]string{}  // env -> package -> model
+	pkgSpec := map[string]map[string]string{}  // env -> package -> spec
+	for _, name := range c.order {
+		m := c.models[name]
+		env := m.ComfyEnvironment()
+		if env == "" || m.IsEnvironment() {
+			continue
+		}
+		if !envName.MatchString(env) {
+			return nil, fmt.Errorf("model %q: comfyui.environment %q is not a name of lowercase letters, digits, '.', '_' and '-'",
+				name, env)
+		}
+		if !m.ServesComfyUI() || m.External != nil {
+			return nil, fmt.Errorf("model %q: comfyui.environment is for a model the cluster's ComfyUI serves", name)
+		}
+		e := byName[env]
+		if e == nil {
+			e = &Environment{Name: env}
+			byName[env] = e
+			order = append(order, env)
+			nodeFrom[env], nodeAt[env] = map[string]string{}, map[string]string{}
+			pkgFrom[env], pkgSpec[env] = map[string]string{}, map[string]string{}
+		}
+		e.Models = append(e.Models, name)
+		for _, src := range m.WeightSources() {
+			if !slices.Contains(e.Sources, src) {
+				e.Sources = append(e.Sources, src)
+			}
+		}
+		for _, n := range m.ComfyUI.Nodes {
+			repo := strings.TrimSuffix(strings.TrimRight(n.Repo, "/"), ".git")
+			if at, seen := nodeAt[env][repo]; seen {
+				if at != n.Commit {
+					return nil, fmt.Errorf("environment %q: models %q and %q name custom node %s at different commits (%s, %s): "+
+						"one replica holds one of them", env, nodeFrom[env][repo], name, n.Repo, short(at), short(n.Commit))
+				}
+			} else {
+				nodeAt[env][repo], nodeFrom[env][repo] = n.Commit, name
+				e.Nodes = append(e.Nodes, CustomNode{Repo: n.Repo, Commit: n.Commit})
+			}
+			i := slices.IndexFunc(e.Nodes, func(x CustomNode) bool {
+				return strings.TrimSuffix(strings.TrimRight(x.Repo, "/"), ".git") == repo
+			})
+			for _, b := range n.Build {
+				if !slices.Contains(e.Nodes[i].Build, b) {
+					e.Nodes[i].Build = append(e.Nodes[i].Build, b)
+				}
+			}
+			for _, r := range n.Requirements {
+				pkg, spec := requirementName(r), normalizeSpec(r)
+				if prev, seen := pkgSpec[env][pkg]; seen {
+					if prev != spec {
+						return nil, fmt.Errorf("environment %q: models %q and %q ask for %s as %q and %q: "+
+							"one Python holds one version; name the same range in both",
+							env, pkgFrom[env][pkg], name, pkg, prev, spec)
+					}
+					continue
+				}
+				pkgSpec[env][pkg], pkgFrom[env][pkg] = spec, name
+				// The requirement goes with the node that first named it:
+				// what the replica installs is the union, and each once.
+				e.Nodes[i].Requirements = append(e.Nodes[i].Requirements, strings.TrimSpace(r))
+			}
+		}
+	}
+	out := make([]Environment, 0, len(order))
+	for _, n := range order {
+		out = append(out, *byName[n])
+	}
+	return out, nil
+}
+
+// requirementName is a requirement's package, as PyPI compares names.
+func requirementName(spec string) string {
+	s := strings.TrimSpace(spec)
+	if i := strings.IndexAny(s, "<>=!~;[ "); i >= 0 {
+		s = s[:i]
+	}
+	return strings.NewReplacer("_", "-", ".", "-").Replace(strings.ToLower(s))
+}
+
+// normalizeSpec is a requirement without its spaces and with its package
+// named as PyPI compares it, so "transformers >=4.50, <5" and
+// "Transformers>=4.50,<5" are one range.
+func normalizeSpec(spec string) string {
+	s := strings.Join(strings.Fields(spec), "")
+	name := requirementName(s)
+	i := strings.IndexAny(s, "<>=!~;[")
+	if i < 0 {
+		return name
+	}
+	return name + s[i:]
+}
+
+func short(commit string) string {
+	if len(commit) > 12 {
+		return commit[:12]
+	}
+	return commit
+}

internal/control/catalog/environments_test.go

@@ -0,0 +1,114 @@
+package catalog
+
+import (
+	"strings"
+	"testing"
+)
+
+const (
+	commitA = "0123456789abcdef0123456789abcdef01234567"
+	commitB = "fedcba9876543210fedcba9876543210fedcba98"
+)
+
+func inEnv(name, env, source string, nodes ...CustomNode) Model {
+	m := comfyModel(source, &ComfyUI{Workflow: "w.json", Output: OutputMeshes, Environment: env, Nodes: nodes})
+	m.Name = name
+	return m
+}
+
+func TestModelsInOneEnvironmentShareTheirNodesAndWeights(t *testing.T) {
+	sf3d := CustomNode{Repo: "https://github.com/Stability-AI/stable-fast-3d", Commit: commitA,
+		Requirements: []string{"trimesh", "transformers>=4.42,<5"}}
+	tripo := CustomNode{Repo: "https://github.com/flowtyone/ComfyUI-Flowty-TripoSR", Commit: commitB,
+		Requirements: []string{"Transformers >= 4.42, <5", "rembg"}}
+	flux := comfyModel("/w/flux.safetensors", &ComfyUI{Environment: "shared"})
+	cat, err := New([]Model{
+		flux,
+		inEnv("sf3d", "shared", "/w/sf3d/model.safetensors", sf3d),
+		inEnv("triposr", "shared", "/w/tripo/model.ckpt", tripo),
+		inEnv("alone", "", "/w/alone.ckpt"),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	envs := cat.Environments()
+	if len(envs) != 1 {
+		t.Fatalf("environments %+v", envs)
+	}
+	e := envs[0]
+	if strings.Join(e.Models, ",") != "flux,sf3d,triposr" {
+		t.Errorf("models %v", e.Models)
+	}
+	if len(e.Sources) != 3 || len(e.Nodes) != 2 {
+		t.Errorf("sources %v nodes %+v", e.Sources, e.Nodes)
+	}
+	// transformers once, with the node that named it first; rembg with its own.
+	if got := strings.Join(e.Nodes[0].Requirements, " "); got != "trimesh transformers>=4.42,<5" {
+		t.Errorf("first node's requirements %q", got)
+	}
+	if got := strings.Join(e.Nodes[1].Requirements, " "); got != "rembg" {
+		t.Errorf("second node's requirements %q", got)
+	}
+	if got, ok := cat.EnvironmentOf("sf3d"); !ok || got.Name != "shared" {
+		t.Errorf("sf3d's environment %+v %v", got, ok)
+	}
+	if _, ok := cat.EnvironmentOf("alone"); ok {
+		t.Error("a model with no environment is in one")
+	}
+}
+
+func TestAnEnvironmentWhoseModelsDisagreeIsRefused(t *testing.T) {
+	node := func(commit string, reqs ...string) CustomNode {
+		return CustomNode{Repo: "https://github.com/a/node", Commit: commit, Requirements: reqs}
+	}
+	for name, c := range map[string]struct {
+		models []Model
+		want   string
+	}{
+		"two commits of one node": {[]Model{
+			inEnv("a", "e", "/w/a", node(commitA)), inEnv("b", "e", "/w/b", node(commitB))}, "different commits"},
+		"two ranges of one package": {[]Model{
+			inEnv("a", "e", "/w/a", node(commitA, "numpy<2")),
+			inEnv("b", "e", "/w/b", CustomNode{Repo: "https://github.com/b/other", Commit: commitB,
+				Requirements: []string{"numpy>=2"}})}, `"a" and "b" ask for numpy`},
+		"a bad name": {[]Model{inEnv("a", "Shared Env", "/w/a")}, "comfyui.environment"},
+	} {
+		if _, err := New(c.models); err == nil || !strings.Contains(err.Error(), c.want) {
+			t.Errorf("%s: %v", name, err)
+		}
+	}
+	// The same node at the same commit, the same range written two ways: fine.
+	if _, err := New([]Model{
+		inEnv("a", "e", "/w/a", node(commitA, "numpy >= 2")),
+		inEnv("b", "e", "/w/b", node(commitA, "NumPy>=2")),
+	}); err != nil {
+		t.Errorf("agreeing models refused: %v", err)
+	}
+}
+
+func TestALicenceIsSaidSoAMachineCanMatchIt(t *testing.T) {
+	yes := true
+	ok := License{ID: "tencent-hunyuan-community", Name: "Tencent Hunyuan Community License", Commercial: &yes,
+		ExcludedRegions: []string{"EU", "GB", "KR"}}
+	m := comfyModel("/w/f.safetensors", nil)
+	m.License = &ok
+	if _, err := New([]Model{m}); err != nil {
+		t.Fatalf("a full licence refused: %v", err)
+	}
+	for name, c := range map[string]struct {
+		l    License
+		want string
+	}{
+		"no name":        {License{ID: "MIT"}, "license.name"},
+		"a sentence id":  {License{ID: "the MIT one", Name: "MIT"}, "license.id"},
+		"a lowercase eu": {License{Name: "x", ExcludedRegions: []string{"eu"}}, "excluded_regions"},
+		"a negative cap": {License{Name: "x", RevenueCapUSD: -1}, "revenue_cap_usd"},
+	} {
+		m := comfyModel("/w/f.safetensors", nil)
+		l := c.l
+		m.License = &l
+		if _, err := New([]Model{m}); err == nil || !strings.Contains(err.Error(), c.want) {
+			t.Errorf("%s: %v", name, err)
+		}
+	}
+}

internal/control/catalog/hardware.go

@@ -0,0 +1,188 @@
+package catalog
+
+import (
+	"fmt"
+	"slices"
+	"strconv"
+	"strings"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/control/placement"
+)
+
+// Profiles that fit the hardware.
+//
+// A profile names its GPU class — 6000-24g, a100-80g — and placement matches
+// it exactly. A catalog entry meant for many sites cannot know their class
+// names: the PoC has one Turing card, a customer an A100, another an L40S. So
+// a profile may say what card it needs instead — a compute capability, a
+// memory — and stands for every class in the cluster that meets it. What
+// differs between cards goes on the profile too: its own weights (Source),
+// its own workflow and nodes (ComfyUI), its own engine arguments. The model
+// then has, say, an fp8 profile for compute 8.9 and up at a higher priority
+// and an fp16 one for anything with 16 GB, and each site gets the best its
+// cards can run.
+
+// GPUNeed is what card a profile needs.
+type GPUNeed struct {
+	// MinComputeCapability is the oldest architecture that runs it: 7.5 is
+	// Turing, 8.0 Ampere (bf16, flash-attention 2), 8.9 Ada (fp8), 9.0 Hopper.
+	MinComputeCapability float64 `json:"min_compute_capability,omitempty" koanf:"min_compute_capability"`
+	// MinMemoryGB is the card's own memory it needs.
+	MinMemoryGB int `json:"min_memory_gb,omitempty" koanf:"min_memory_gb"`
+}
+
+// ProfileComfyUI is what a ComfyUI profile runs differently from the model:
+// each field set replaces the model's.
+type ProfileComfyUI struct {
+	Workflow   string       `json:"workflow,omitempty" koanf:"workflow"`
+	Checkpoint string       `json:"checkpoint,omitempty" koanf:"checkpoint"`
+	Nodes      []CustomNode `json:"nodes,omitempty" koanf:"nodes"`
+}
+
+// GPUKind is one kind of card in the cluster.
+type GPUKind struct {
+	Class             string
+	ComputeCapability float64
+	MemoryGB          int
+}
+
+// GPUKinds are the kinds of card among gpus, one each, by class.
+func GPUKinds(gpus []discovery.GPU) []GPUKind {
+	seen := map[string]bool{}
+	var out []GPUKind
+	for _, g := range gpus {
+		c := g.Class()
+		if seen[c] {
+			continue
+		}
+		seen[c] = true
+		cc, _ := strconv.ParseFloat(strings.TrimSpace(g.ComputeCapability), 64)
+		// A MIG instance's memory is the instance's: what a process sees.
+		out = append(out, GPUKind{Class: c, ComputeCapability: cc, MemoryGB: (g.MemoryTotalMB + 512) / 1024})
+	}
+	slices.SortFunc(out, func(a, b GPUKind) int { return strings.Compare(a.Class, b.Class) })
+	return out
+}
+
+// Fits reports whether a kind of card meets the need.
+func (n GPUNeed) Fits(k GPUKind) bool {
+	// A card that does not say its capability is not taken for one that has
+	// it: an fp8 workflow on a card of unknown age fails at its first step.
+	if n.MinComputeCapability > 0 && k.ComputeCapability+1e-9 < n.MinComputeCapability {
+		return false
+	}
+	return n.MinMemoryGB <= 0 || k.MemoryGB >= n.MinMemoryGB
+}
+
+func (n GPUNeed) String() string {
+	var parts []string
+	if n.MinComputeCapability > 0 {
+		parts = append(parts, fmt.Sprintf("compute %.1f+", n.MinComputeCapability))
+	}
+	if n.MinMemoryGB > 0 {
+		parts = append(parts, fmt.Sprintf("%d GB+", n.MinMemoryGB))
+	}
+	if len(parts) == 0 {
+		return "any GPU"
+	}
+	return strings.Join(parts, ", ")
+}
+
+// forClass is a profile that names its GPU by need, as the one it stands for
+// on a class.
+func (p Profile) forClass(class string) Profile {
+	p.Name = p.Name + "@" + class
+	p.GPUClass = class
+	p.GPU = nil
+	return p
+}
+
+func (p Profile) validateHardware(m Model) error {
+	if strings.Contains(p.Name, "@") {
+		return fmt.Errorf("model %q profile %q: a profile's name has no '@': it is how one standing for a class is named",
+			m.Name, p.Name)
+	}
+	if p.GPU != nil {
+		if p.GPUClass != "" {
+			return fmt.Errorf("model %q profile %q: gpu_class and gpu are one or the other: a class, or what card it needs",
+				m.Name, p.Name)
+		}
+		if p.GPU.MinComputeCapability < 0 || p.GPU.MinComputeCapability > 20 || p.GPU.MinMemoryGB < 0 {
+			return fmt.Errorf("model %q profile %q: gpu %+v is not a compute capability and a memory", m.Name, p.Name, *p.GPU)
+		}
+	}
+	if p.ComfyUI != nil {
+		if p.Engine != EngineComfyUI {
+			return fmt.Errorf("model %q profile %q: comfyui: is for a profile of engine comfyui", m.Name, p.Name)
+		}
+		if err := checkWorkflow(m.Name, p.ComfyUI.Workflow); err != nil {
+			return err
+		}
+		for _, n := range p.ComfyUI.Nodes {
+			if err := n.validate(m.Name); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// PlacementProfilesFor is a model's profiles in placement's view, each one
+// that names its GPU by need standing for every kind of card among kinds
+// that meets it, at its own priority. One that no card meets stands for
+// none, and is not tried.
+func (m Model) PlacementProfilesFor(kinds []GPUKind) []placement.Profile {
+	var expanded []Profile
+	for _, p := range m.Profiles {
+		if p.GPU == nil {
+			expanded = append(expanded, p)
+			continue
+		}
+		for _, k := range kinds {
+			if p.GPU.Fits(k) {
+				expanded = append(expanded, p.forClass(k.Class))
+			}
+		}
+	}
+	mm := m
+	mm.Profiles = expanded
+	return mm.PlacementProfiles()
+}
+
+// ComfyWorkflowFor is what a profile's replicas are sent: the profile's own
+// workflow and checkpoint where it has them, else the model's.
+func (m Model) ComfyWorkflowFor(p Profile) (workflow, checkpoint string) {
+	workflow, checkpoint = m.ComfyWorkflow()
+	if p.ComfyUI != nil {
+		if p.ComfyUI.Workflow != "" {
+			workflow = p.ComfyUI.Workflow
+		}
+		if p.ComfyUI.Checkpoint != "" {
+			checkpoint = p.ComfyUI.Checkpoint
+		}
+	}
+	if p.Source != "" && (p.ComfyUI == nil || p.ComfyUI.Checkpoint == "") && !strings.HasSuffix(p.Source, "/") {
+		// A profile with weights of its own loads them by their own name.
+		checkpoint = lastPathPart(strings.TrimPrefix(p.Source, "hf:"))
+	}
+	return workflow, checkpoint
+}
+
+// ComfyNodesFor are the custom nodes a profile's replicas carry.
+func (m Model) ComfyNodesFor(p Profile) []CustomNode {
+	if p.ComfyUI != nil && p.ComfyUI.Nodes != nil {
+		return p.ComfyUI.Nodes
+	}
+	if m.ComfyUI != nil {
+		return m.ComfyUI.Nodes
+	}
+	return nil
+}
+
+func lastPathPart(s string) string {
+	if i := strings.LastIndex(s, "/"); i >= 0 {
+		return s[i+1:]
+	}
+	return s
+}

internal/control/catalog/hardware_test.go

@@ -0,0 +1,103 @@
+package catalog
+
+import (
+	"strings"
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/discovery"
+)
+
+// sf3dByCard is one entry for every site: fp16 on anything with 16 GB, and
+// a bf16 workflow with its own weights where the card is Ampere or newer.
+func sf3dByCard() Model {
+	return Model{Name: "sf3d", Source: "/w/sf3d/model.safetensors",
+		ComfyUI: &ComfyUI{Workflow: "/etc/llmgw/workflows/sf3d.json", Output: OutputMeshes},
+		Profiles: []Profile{
+			{Name: "ampere", Engine: EngineComfyUI, TP: 1, Priority: 10, GPU: &GPUNeed{MinComputeCapability: 8.0, MinMemoryGB: 16},
+				Source:  "/w/sf3d-bf16/model-bf16.safetensors",
+				ComfyUI: &ProfileComfyUI{Workflow: "/etc/llmgw/workflows/sf3d-bf16.json"}},
+			{Name: "any", Engine: EngineComfyUI, TP: 1, GPU: &GPUNeed{MinMemoryGB: 16}},
+		}}
+}
+
+func TestAProfileThatNamesItsCardByNeedStandsForEveryClassThatMeetsIt(t *testing.T) {
+	cat, err := New([]Model{sf3dByCard()})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := cat.Resolve("sf3d")
+	turing := GPUKinds([]discovery.GPU{{Name: "Quadro RTX 6000", MemoryTotalMB: 24576, ComputeCapability: "7.5"}})
+	if len(turing) != 1 || turing[0].Class != "6000-24g" || turing[0].ComputeCapability != 7.5 || turing[0].MemoryGB != 24 {
+		t.Fatalf("kinds %+v", turing)
+	}
+	ps := m.PlacementProfilesFor(turing)
+	if len(ps) != 1 || ps[0].Name != "any@6000-24g" || ps[0].GPUClass != "6000-24g" {
+		t.Fatalf("on Turing: %+v", ps)
+	}
+
+	both := GPUKinds([]discovery.GPU{
+		{Name: "Quadro RTX 6000", MemoryTotalMB: 24576, ComputeCapability: "7.5"},
+		{Name: "NVIDIA A100-SXM4-80GB", MemoryTotalMB: 81920, ComputeCapability: "8.0"},
+		{Name: "NVIDIA A100-SXM4-80GB", MemoryTotalMB: 81920, ComputeCapability: "8.0"},
+		{Name: "Tesla T4", MemoryTotalMB: 15360, ComputeCapability: "7.5"},
+	})
+	var names []string
+	for _, p := range m.PlacementProfilesFor(both) {
+		names = append(names, p.Name+"/"+p.GPUClass)
+	}
+	if got := strings.Join(names, " "); got != "ampere@a100-80g/a100-80g any@6000-24g/6000-24g any@a100-80g/a100-80g" {
+		t.Errorf("on a mixed cluster: %s (the T4 has 15 GB, short of 16)", got)
+	}
+	if len(m.PlacementProfiles()) != 0 {
+		t.Error("with no cards known, a profile by need stood for something")
+	}
+
+	// A replica placed as ampere@a100-80g is started with that profile's own
+	// weights, workflow and class.
+	p, ok := m.ProfileByName("ampere@a100-80g")
+	if !ok || p.GPUClass != "a100-80g" || p.GPU != nil || m.SourceOf(p) != "/w/sf3d-bf16/model-bf16.safetensors" {
+		t.Fatalf("profile %+v %v", p, ok)
+	}
+	if w, ckpt := m.ComfyWorkflowFor(p); w != "/etc/llmgw/workflows/sf3d-bf16.json" || ckpt != "model-bf16.safetensors" {
+		t.Errorf("workflow %q checkpoint %q", w, ckpt)
+	}
+	if ep, ok := m.EngineProfile("ampere@a100-80g"); !ok || ep.GPUClass != "a100-80g" || ep.ModelPath != "/w/sf3d-bf16/model-bf16.safetensors" {
+		t.Errorf("engine profile %+v", ep)
+	}
+	if w, ckpt := m.ComfyWorkflowFor(m.Profiles[1]); w != "/etc/llmgw/workflows/sf3d.json" || ckpt != "model.safetensors" {
+		t.Errorf("the fallback's workflow %q checkpoint %q", w, ckpt)
+	}
+	if _, ok := m.ProfileByName("nothing@a100-80g"); ok {
+		t.Error("a profile that is not there was found")
+	}
+}
+
+func TestAProfileByNeedIsCheckedLikeAnyOther(t *testing.T) {
+	for name, c := range map[string]struct {
+		p    Profile
+		want string
+	}{
+		"both":           {Profile{Name: "p", Engine: EngineComfyUI, TP: 1, GPUClass: "a100-80g", GPU: &GPUNeed{MinMemoryGB: 8}}, "one or the other"},
+		"an @ in a name": {Profile{Name: "p@x", Engine: EngineComfyUI, TP: 1, GPUClass: "a100-80g"}, "no '@'"},
+		"a capability of 80": {Profile{Name: "p", Engine: EngineComfyUI, TP: 1, GPU: &GPUNeed{MinComputeCapability: 80}},
+			"compute capability"},
+		"comfyui on vllm": {Profile{Name: "p", Engine: "vllm", TP: 1, GPU: &GPUNeed{}, ComfyUI: &ProfileComfyUI{}},
+			"engine comfyui"},
+	} {
+		m := sf3dByCard()
+		m.Profiles = []Profile{c.p}
+		if c.p.Engine == "vllm" {
+			m.ComfyUI = nil
+		}
+		if _, err := New([]Model{m}); err == nil || !strings.Contains(err.Error(), c.want) {
+			t.Errorf("%s: %v", name, err)
+		}
+	}
+	need := GPUNeed{MinComputeCapability: 8.9}
+	if need.Fits(GPUKind{Class: "x", MemoryGB: 80}) {
+		t.Error("a card that does not say its capability was taken for an Ada")
+	}
+	if !need.Fits(GPUKind{ComputeCapability: 9.0}) || need.String() != "compute 8.9+" {
+		t.Error("a Hopper is not an Ada or newer")
+	}
+}

internal/control/catalog/presets.go

@@ -0,0 +1,99 @@
+package catalog
+
+import (
+	"slices"
+	"time"
+)
+
+// Preset is a catalog entry that comes with llmgw: a model whose workflow,
+// custom nodes, packages and licence somebody has already found and tried,
+// so that adding it is naming it.
+//
+// A ComfyUI model cannot be worked out from its repository the way a GGUF
+// can: which workflow runs it, which node at which commit, which packages at
+// which ranges, and under which licence what it makes is shipped are learned
+// by running it. Written in a document, they were copied by hand on every
+// site, and a line left out — the node that cuts the picture out — gave
+// meshes with their background as geometry.
+type Preset struct {
+	// Makes is what it makes: pictures or meshes.
+	Makes string
+	Model Model
+}
+
+// Presets are the entries that come with llmgw, by name. Each profile says
+// the card it needs rather than naming a class, so the entry places on any
+// site's cards.
+func Presets() []Preset {
+	yes := true
+	return []Preset{
+		{
+			Makes: OutputPictures,
+			Model: Model{
+				Name:        "flux-schnell",
+				Description: "FLUX.1 [schnell]: pictures from a prompt, in four steps",
+				Source:      "hf:Comfy-Org/flux1-schnell/flux1-schnell-fp8.safetensors",
+				ComfyUI:     &ComfyUI{Workflow: "flux-schnell"},
+				License: &License{
+					ID: "Apache-2.0", Name: "Apache-2.0", Commercial: &yes,
+					URL:    "https://huggingface.co/black-forest-labs/FLUX.1-schnell",
+					Notice: "Made with FLUX.1 [schnell] (Black Forest Labs, Apache 2.0).",
+				},
+				Scaling: Scaling{Min: 0, Max: 1, IdleTimeout: 15 * time.Minute},
+				// The checkpoint is 17 GB with its text encoders; a card with
+				// no fp8 has its weights upcast as they load.
+				Profiles: []Profile{{Name: "gpu", Engine: EngineComfyUI, TP: 1,
+					GPU: &GPUNeed{MinComputeCapability: 7.0, MinMemoryGB: 24}}},
+			},
+		},
+		{
+			Makes: OutputMeshes,
+			Model: Model{
+				Name:        "triposr",
+				Description: "TripoSR: a 3D model (GLB) from a picture of one object on a plain background, as a job",
+				Source:      "hf:stabilityai/TripoSR/model.ckpt",
+				ComfyUI: &ComfyUI{
+					Workflow: "triposr",
+					Output:   OutputMeshes,
+					Nodes: []CustomNode{{
+						Repo:   "https://github.com/flowtyone/ComfyUI-Flowty-TripoSR",
+						Commit: "a0c94ac60a7cc062604f61aeeea6d0d493521de3",
+						// transformers 5 renames the checkpoint's keys; rembg
+						// and onnxruntime cut out a picture with no alpha.
+						Requirements: []string{"omegaconf", "trimesh", "scikit-image", "imageio",
+							"transformers>=4.50.3,<5", "huggingface-hub<1", "tokenizers", "rembg", "onnxruntime"},
+					}},
+				},
+				License: &License{
+					ID: "MIT", Name: "MIT", Commercial: &yes,
+					URL: "https://huggingface.co/stabilityai/TripoSR/blob/main/LICENSE",
+					Notice: "Made with TripoSR (Stability AI and Tripo AI, MIT). Its image encoder is " +
+						"facebook/dino-vitb16 (Apache 2.0). TripoSR was trained on a filtered subset of " +
+						"Objaverse, some of whose objects carry their own licences.",
+				},
+				Scaling: Scaling{Min: 0, Max: 1, IdleTimeout: 10 * time.Minute},
+				Profiles: []Profile{{Name: "gpu", Engine: EngineComfyUI, TP: 1,
+					GPU: &GPUNeed{MinComputeCapability: 7.0, MinMemoryGB: 8}}},
+			},
+		},
+	}
+}
+
+// PresetNamed is the preset of that name.
+func PresetNamed(name string) (Preset, bool) {
+	ps := Presets()
+	i := slices.IndexFunc(ps, func(p Preset) bool { return p.Model.Name == name })
+	if i < 0 {
+		return Preset{}, false
+	}
+	return ps[i], true
+}
+
+// PresetNames are the presets' names, in order.
+func PresetNames() []string {
+	var out []string
+	for _, p := range Presets() {
+		out = append(out, p.Model.Name)
+	}
+	return out
+}

internal/control/catalog/presets_test.go

@@ -0,0 +1,59 @@
+package catalog
+
+import (
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/comfy"
+)
+
+func TestEveryPresetIsACatalogEntryThatLoads(t *testing.T) {
+	var models []Model
+	for _, p := range Presets() {
+		models = append(models, p.Model)
+	}
+	cat, err := New(models)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, p := range Presets() {
+		m, ok := cat.Resolve(p.Model.Name)
+		if !ok {
+			t.Fatalf("%s is not in the catalog", p.Model.Name)
+		}
+		if p.Makes == OutputMeshes && !m.MakesMeshes() || p.Makes == OutputPictures && !m.MakesImages() {
+			t.Errorf("%s does not make %s", m.Name, p.Makes)
+		}
+		// A shipped entry has its workflow inside llmgw, not in a file a
+		// site would have to write.
+		w, ckpt := m.ComfyWorkflow()
+		if _, err := comfy.Load(w); err != nil {
+			t.Errorf("%s: %v", m.Name, err)
+		}
+		if ckpt == "" {
+			t.Errorf("%s has no checkpoint", m.Name)
+		}
+		if m.License == nil || m.License.ID == "" || m.License.Commercial == nil {
+			t.Errorf("%s does not say its licence for a machine to match", m.Name)
+		}
+		for _, pr := range m.Profiles {
+			if pr.GPUClass != "" || pr.GPU == nil {
+				t.Errorf("%s/%s names a class: a preset fits any site's cards", m.Name, pr.Name)
+			}
+		}
+	}
+}
+
+func TestAPresetIsFoundByName(t *testing.T) {
+	if p, ok := PresetNamed("triposr"); !ok || p.Model.ComfyUI.Workflow != "triposr" {
+		t.Errorf("triposr: %+v %v", p, ok)
+	}
+	if _, ok := PresetNamed("sdxl"); ok {
+		t.Error("a preset that is not there was found")
+	}
+	// Each call is a fresh copy: a caller changing one changes nobody's.
+	a, _ := PresetNamed("triposr")
+	a.Model.ComfyUI.Nodes[0].Requirements[0] = "x"
+	if b, _ := PresetNamed("triposr"); b.Model.ComfyUI.Nodes[0].Requirements[0] == "x" {
+		t.Error("a preset was changed by a caller")
+	}
+}

internal/control/catalog/profilesource_test.go

@@ -0,0 +1,90 @@
+package catalog
+
+import (
+	"encoding/json"
+	"slices"
+	"strings"
+	"testing"
+)
+
+// embedModel is an embedding model the way it was wanted on the PoC: vLLM
+// on the card from the repository, llama.cpp on CPUs from a GGUF.
+func embedModel() Model {
+	return Model{Name: "qwen3-embed-4b", Source: "Qwen/Qwen3-Embedding-4B",
+		Profiles: []Profile{
+			{Name: "gpu", Engine: "vllm", GPUClass: "6000-24g", TP: 1},
+			{Name: "cpu", Engine: "llamacpp", Source: "hf:Qwen/Qwen3-Embedding-4B-GGUF/Qwen3-Embedding-4B-Q8_0.gguf"},
+		}}
+}
+
+func TestEachProfileLoadsItsOwnSource(t *testing.T) {
+	// The catalog had one source a model, so serving an embedding model by
+	// vLLM on a card and by llama.cpp on CPUs meant swapping the entry by
+	// hand halfway through an import.
+	cat, err := New([]Model{embedModel()})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := cat.Resolve("qwen3-embed-4b")
+	gpu, _ := m.EngineProfile("gpu")
+	cpu, _ := m.EngineProfile("cpu")
+	if gpu.ModelPath != "Qwen/Qwen3-Embedding-4B" || !strings.HasSuffix(cpu.ModelPath, "Q8_0.gguf") {
+		t.Errorf("gpu loads %q, cpu %q", gpu.ModelPath, cpu.ModelPath)
+	}
+	for _, p := range m.PlacementProfiles() {
+		if want := map[string]string{"gpu": gpu.ModelPath, "cpu": cpu.ModelPath}[p.Name]; p.Source != want {
+			t.Errorf("placement for %s looks for %q, want %q", p.Name, p.Source, want)
+		}
+	}
+	if got := m.WeightSources(); len(got) != 2 || !slices.Contains(got, cpu.ModelPath) {
+		t.Errorf("weight sources %v: a profile's own must not be collected", got)
+	}
+}
+
+func TestAProfileWithoutASourceKeepsItsFingerprint(t *testing.T) {
+	// Replicas are compared with their profile by fingerprint; a field added
+	// to every profile must not make every running replica look stale.
+	p := Profile{Name: "gpu", Engine: "vllm", GPUClass: "6000-24g", TP: 1}
+	before := p.Fingerprint()
+	if strings.Contains(mustJSON(t, p), "source") {
+		t.Error("an empty source is written into the profile")
+	}
+	p.Source = "Qwen/Other"
+	if p.Fingerprint() == before {
+		t.Error("a profile whose source changed reads as unchanged")
+	}
+}
+
+func TestAProfileSourceIsCheckedAsTheModelsIs(t *testing.T) {
+	page := embedModel()
+	page.Profiles[1].Source = "https://huggingface.co/Qwen/Qwen3-Embedding-4B-GGUF"
+	if _, err := New([]Model{page}); err == nil || !strings.Contains(err.Error(), `profile "cpu"`) {
+		t.Errorf("a repository page for llama.cpp: %v", err)
+	}
+	// The model's own source may be a page vLLM reads as a repository, now
+	// that the llama.cpp profile loads something else.
+	repo := embedModel()
+	repo.Source = "https://huggingface.co/Qwen/Qwen3-Embedding-4B"
+	cat, err := New([]Model{repo})
+	if err != nil {
+		t.Fatalf("a repository page for the vLLM profile beside a llama.cpp one with its own GGUF: %v", err)
+	}
+	m, _ := cat.Resolve("qwen3-embed-4b")
+	if m.Source != "Qwen/Qwen3-Embedding-4B" {
+		t.Errorf("the page was not read as the repository: %q", m.Source)
+	}
+	trt := embedModel()
+	trt.Profiles[0] = Profile{Name: "gpu", Engine: "trtllm", GPUClass: "6000-24g", TP: 1, Source: "hf:a/b/m.gguf"}
+	if _, err := New([]Model{trt}); err == nil || !strings.Contains(err.Error(), "not a .gguf") {
+		t.Errorf("trtllm given a GGUF by its profile: %v", err)
+	}
+}
+
+func mustJSON(t *testing.T, v any) string {
+	t.Helper()
+	b, err := json.Marshal(v)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(b)
+}

internal/control/catalog/shared.go

@@ -0,0 +1,110 @@
+package catalog
+
+import (
+	"time"
+)
+
+// A shared replica: one ComfyUI serving every model of an environment.
+//
+// Each ComfyUI model ran in a replica of its own, so on one card a picture
+// model and a 3D model took turns, each stopping the other and loading
+// ComfyUI and its weights from nothing. An environment of two or more models
+// gets a hidden catalog entry of its own, whose replica carries every
+// member's weights and custom nodes and answers for each of them; the
+// members get no replicas of their own. Placement, idleness, eviction and
+// adoption then work as for any model, on that entry.
+
+// RoleEnvironment is the role of an environment's hidden entry.
+const RoleEnvironment = "environment"
+
+// EnvModelPrefix names an environment's hidden entry: comfyui-env-<name>.
+const EnvModelPrefix = "comfyui-env-"
+
+// SharedComfy is what an environment's entry carries of its members.
+type SharedComfy struct {
+	Environment string         `json:"environment"`
+	Members     []SharedMember `json:"members"`
+}
+
+// SharedMember is one model a shared replica answers for.
+type SharedMember struct {
+	Name    string   `json:"name"`
+	Aliases []string `json:"aliases,omitempty"`
+	// Source is the member's weights, which the replica's node fetches.
+	Source string `json:"source"`
+	// HFRepo is the repository its node loads the weights by name from.
+	HFRepo string `json:"hf_repo,omitempty"`
+	// Workflow and Checkpoint are what a request for it is sent.
+	Workflow   string `json:"workflow"`
+	Checkpoint string `json:"checkpoint"`
+}
+
+// IsEnvironment reports whether a model is an environment's hidden entry.
+func (m Model) IsEnvironment() bool { return m.Role == RoleEnvironment }
+
+// SharedBy is the hidden entry whose replica serves a model, when it is in
+// an environment of two or more.
+func (c *Catalog) SharedBy(model string) (string, bool) {
+	m, ok := c.Resolve(model)
+	if !ok || m.IsEnvironment() || m.ComfyEnvironment() == "" {
+		return "", false
+	}
+	name := EnvModelPrefix + m.ComfyEnvironment()
+	if _, ok := c.models[name]; !ok {
+		return "", false
+	}
+	return name, true
+}
+
+// envModel is the hidden entry for an environment of two or more models: on
+// the first member's profiles, needing the most memory any of them does,
+// on demand for the longest idle timeout of theirs.
+func envModel(env Environment, members []Model) Model {
+	first := members[0]
+	profs := make([]Profile, len(first.Profiles))
+	copy(profs, first.Profiles)
+	mem := 0
+	for _, m := range members {
+		for _, p := range m.Profiles {
+			mem = max(mem, p.MinMemoryGB)
+		}
+	}
+	shared := &SharedComfy{Environment: env.Name}
+	var idle time.Duration
+	minN, maxN := 0, 1
+	class := ""
+	for _, m := range members {
+		workflow, ckpt := m.ComfyWorkflow()
+		hf := ""
+		if m.ComfyUI != nil {
+			hf = m.ComfyUI.HuggingFaceRepo
+		}
+		shared.Members = append(shared.Members, SharedMember{Name: m.Name, Aliases: m.Aliases,
+			Source: m.Source, HFRepo: hf, Workflow: workflow, Checkpoint: ckpt})
+		idle = max(idle, m.Scaling.IdleTimeout)
+		minN, maxN = max(minN, m.Scaling.Min), max(maxN, m.Scaling.Max)
+		if ClassRank(m.EffectiveClass()) > ClassRank(class) || class == "" {
+			class = m.EffectiveClass()
+		}
+	}
+	for i := range profs {
+		profs[i].MinMemoryGB = max(profs[i].MinMemoryGB, mem)
+		profs[i].ComfyUI = nil // the environment's nodes, below
+		profs[i].Source = ""
+	}
+	return Model{
+		Name:        EnvModelPrefix + env.Name,
+		Role:        RoleEnvironment,
+		Description: "the shared ComfyUI replica of environment " + env.Name,
+		Source:      first.Source,
+		ComfyUI:     &ComfyUI{Environment: env.Name, Nodes: env.Nodes, Output: OutputEnvironment},
+		Profiles:    profs,
+		Scaling:     Scaling{Min: minN, Max: maxN, IdleTimeout: idle},
+		Class:       class,
+		Shared:      shared,
+	}
+}
+
+// OutputEnvironment is an environment entry's output: it makes nothing of
+// its own, its members do.
+const OutputEnvironment = "environment"

internal/control/catalog/shared_test.go

@@ -0,0 +1,51 @@
+package catalog
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestAnEnvironmentOfTwoGetsOneHiddenEntryThatServesBoth(t *testing.T) {
+	// flux and a mesh model on one card took turns, each loading ComfyUI
+	// from nothing; in one environment one replica answers for both.
+	flux := comfyModel("/w/flux.safetensors", &ComfyUI{Environment: "art", Workflow: "flux-schnell"})
+	flux.Scaling = Scaling{Max: 1, IdleTimeout: 15 * time.Minute}
+	sf3d := inEnv("sf3d", "art", "/w/sf3d/", CustomNode{Repo: "https://example.com/sf3d", Commit: commitA})
+	sf3d.ComfyUI.HuggingFaceRepo = "stabilityai/stable-fast-3d"
+	sf3d.ComfyUI.Checkpoint = "model.safetensors"
+	sf3d.Scaling = Scaling{Max: 1, IdleTimeout: 10 * time.Minute}
+	cat, err := New([]Model{flux, sf3d, inEnv("alone", "solo", "/w/alone.ckpt")})
+	if err != nil {
+		t.Fatal(err)
+	}
+	host, ok := cat.SharedBy("sf3d")
+	if !ok || host != "comfyui-env-art" {
+		t.Fatalf("sf3d shared by %q %v", host, ok)
+	}
+	if _, ok := cat.SharedBy("alone"); ok {
+		t.Error("an environment of one got a hidden entry")
+	}
+	em, _ := cat.Resolve(host)
+	if !em.IsEnvironment() || em.MakesImages() || em.MakesMeshes() || em.Scaling.IdleTimeout != 15*time.Minute ||
+		len(em.Shared.Members) != 2 || em.Shared.Members[1].HFRepo != "stabilityai/stable-fast-3d" {
+		t.Errorf("entry %+v", em)
+	}
+	p, ok := em.EngineProfile(em.Profiles[0].Name)
+	if !ok {
+		t.Fatal("no engine profile")
+	}
+	var ms []map[string]string
+	if err := json.Unmarshal([]byte(p.Env[SharedModelsEnv]), &ms); err != nil || len(ms) != 2 || ms[1]["source"] != "/w/sf3d/" {
+		t.Errorf("members for the agent %q %v", p.Env[SharedModelsEnv], err)
+	}
+	if !strings.Contains(p.Env[NodesEnv], "sf3d") {
+		t.Errorf("nodes %q", p.Env[NodesEnv])
+	}
+	// A catalog built again from its own models is the same catalog.
+	again, err := New(cat.Models())
+	if err != nil || len(again.Models()) != len(cat.Models()) {
+		t.Errorf("rebuilt: %v, %d models vs %d", err, len(again.Models()), len(cat.Models()))
+	}
+}

internal/control/catalog/workflow.go

@@ -0,0 +1,156 @@
+package catalog
+
+import (
+	"fmt"
+	"regexp"
+	"slices"
+	"strings"
+)
+
+// What a ComfyUI workflow takes and what it makes, said in the catalog so a
+// model is data rather than code: a request is checked against its inputs
+// before a job is written, a client can build a form from /v1/models, and
+// the answer is picked from the files the workflow saved by its output kind.
+
+// The kinds of thing a ComfyUI model makes, beside pictures and meshes.
+const (
+	OutputVideo = "video"
+	OutputAudio = "audio"
+	// OutputFiles is whatever the workflow saves, of any type.
+	OutputFiles = "files"
+)
+
+// Outputs are every output kind a ComfyUI model may name.
+var Outputs = []string{OutputPictures, OutputMeshes, OutputVideo, OutputAudio, OutputFiles}
+
+// The types of a workflow's input.
+const (
+	InputText   = "text"
+	InputInt    = "int"
+	InputFloat  = "float"
+	InputBool   = "bool"
+	InputChoice = "choice"
+	InputImage  = "image"
+	InputMask   = "mask"
+	InputAudio  = "audio"
+	InputVideo  = "video"
+	InputFile   = "file"
+)
+
+// InputTypes are every type an input may have.
+var InputTypes = []string{InputText, InputInt, InputFloat, InputBool, InputChoice,
+	InputImage, InputMask, InputAudio, InputVideo, InputFile}
+
+// Input is one thing a workflow takes from a request: the placeholder
+// {{name}} in its graph, filled with the request's inputs.name.
+type Input struct {
+	// Name is the placeholder's, and the request's key.
+	Name string `json:"name" koanf:"name"`
+	// Type is one of text, int, float, bool, choice, image, mask, audio,
+	// video, file. The last five are files, sent as base64, a data URL, or
+	// the id of a file uploaded to /v1/files, and put in ComfyUI's input
+	// directory; the placeholder gets the name they were given there.
+	Type string `json:"type" koanf:"type"`
+	// Required inputs must be in every request; the others take Default,
+	// or the workflow's own {{name|default}}.
+	Required bool `json:"required,omitempty" koanf:"required"`
+	Default  any  `json:"default,omitempty" koanf:"default"`
+	// Min and Max bound a number; for text, Max bounds its length.
+	Min *float64 `json:"min,omitempty" koanf:"min"`
+	Max *float64 `json:"max,omitempty" koanf:"max"`
+	// Choices are what a choice may be.
+	Choices []string `json:"choices,omitempty" koanf:"choices"`
+	// MaxMB bounds a file input; zero is the type's own bound.
+	MaxMB int `json:"max_mb,omitempty" koanf:"max_mb"`
+	// Doc says what the input is for, to whoever fills it in.
+	Doc string `json:"doc,omitempty" koanf:"doc"`
+}
+
+// IsFile reports whether the input is a file put in ComfyUI's input directory.
+func (in Input) IsFile() bool {
+	switch in.Type {
+	case InputImage, InputMask, InputAudio, InputVideo, InputFile:
+		return true
+	}
+	return false
+}
+
+// MaxBytes is the most a file input may be.
+func (in Input) MaxBytes() int64 {
+	if in.MaxMB > 0 {
+		return int64(in.MaxMB) << 20
+	}
+	switch in.Type {
+	case InputImage, InputMask:
+		return 16 << 20
+	case InputVideo:
+		return 256 << 20
+	}
+	return 64 << 20
+}
+
+var inputName = regexp.MustCompile(`^[a-z][a-z0-9_]{0,63}$`)
+
+func (in Input) validate(model string) error {
+	if !inputName.MatchString(in.Name) {
+		return fmt.Errorf("model %q: input %q is not a name of lowercase letters, digits and '_'", model, in.Name)
+	}
+	if !slices.Contains(InputTypes, in.Type) {
+		return fmt.Errorf("model %q: input %q has type %q, not one of %s", model, in.Name, in.Type, strings.Join(InputTypes, ", "))
+	}
+	if in.Type == InputChoice && len(in.Choices) == 0 {
+		return fmt.Errorf("model %q: input %q is a choice with no choices", model, in.Name)
+	}
+	if in.Type != InputChoice && len(in.Choices) > 0 {
+		return fmt.Errorf("model %q: input %q has choices but is not a choice", model, in.Name)
+	}
+	if in.Min != nil && in.Max != nil && *in.Min > *in.Max {
+		return fmt.Errorf("model %q: input %q has min above max", model, in.Name)
+	}
+	if in.Required && in.Default != nil {
+		return fmt.Errorf("model %q: input %q is required and has a default: it is one or the other", model, in.Name)
+	}
+	if in.IsFile() && in.Default != nil {
+		return fmt.Errorf("model %q: input %q is a file and cannot have a default", model, in.Name)
+	}
+	if in.MaxMB < 0 {
+		return fmt.Errorf("model %q: input %q has a negative max_mb", model, in.Name)
+	}
+	return nil
+}
+
+// ComfyOutput is what a ComfyUI model makes: pictures unless it says.
+func (m Model) ComfyOutput() string { return m.comfyOutput() }
+
+// ComfyInputs are what a ComfyUI model's workflow takes from a request.
+func (m Model) ComfyInputs() []Input {
+	if m.ComfyUI == nil {
+		return nil
+	}
+	return m.ComfyUI.Inputs
+}
+
+// RunsWorkflows reports whether a model answers /v1/workflows/runs: any the
+// cluster's ComfyUI or a ComfyUI outside it serves.
+func (m Model) RunsWorkflows() bool { return m.ServesComfyUI() }
+
+func validOutput(model, out string) error {
+	if !slices.Contains(Outputs, out) {
+		return fmt.Errorf("model %q: comfyui.output %q is not one of %s", model, out, strings.Join(Outputs, ", "))
+	}
+	return nil
+}
+
+func validateInputs(model string, inputs []Input) error {
+	seen := map[string]bool{}
+	for _, in := range inputs {
+		if err := in.validate(model); err != nil {
+			return err
+		}
+		if seen[in.Name] {
+			return fmt.Errorf("model %q: input %q is declared twice", model, in.Name)
+		}
+		seen[in.Name] = true
+	}
+	return nil
+}

internal/control/catalog/workflow_test.go

@@ -0,0 +1,47 @@
+package catalog
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestAWorkflowsInputsAreCheckedWhenTheCatalogIsBuilt(t *testing.T) {
+	one := 1.0
+	zero := 0.0
+	run := func(out string, inputs ...Input) Model {
+		return comfyModel("/w/ace.safetensors", &ComfyUI{Workflow: "w.json", Output: out, Inputs: inputs})
+	}
+	cat, err := New([]Model{run(OutputAudio,
+		Input{Name: "tags", Type: InputText, Required: true},
+		Input{Name: "strength", Type: InputFloat, Min: &zero, Max: &one, Default: 0.5},
+		Input{Name: "style", Type: InputChoice, Choices: []string{"pop"}},
+		Input{Name: "clip", Type: InputVideo, MaxMB: 512})})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := cat.Resolve("flux")
+	if !m.RunsWorkflows() || m.MakesImages() || m.MakesMeshes() || m.ComfyOutput() != OutputAudio || len(m.ComfyInputs()) != 4 {
+		t.Errorf("an audio model: runs %v pictures %v meshes %v output %q", m.RunsWorkflows(), m.MakesImages(), m.MakesMeshes(), m.ComfyOutput())
+	}
+	if m.ComfyInputs()[3].MaxBytes() != 512<<20 || (Input{Type: InputImage}).MaxBytes() != 16<<20 {
+		t.Error("a file input's bound")
+	}
+	for name, c := range map[string]struct {
+		m    Model
+		want string
+	}{
+		"an unknown kind":      {run("hologram"), "not one of pictures"},
+		"video, no workflow":   {comfyModel("/w/x", &ComfyUI{Output: OutputVideo}), "makes video names its workflow"},
+		"a capital name":       {run(OutputAudio, Input{Name: "Tags", Type: InputText}), "lowercase"},
+		"an unknown type":      {run(OutputAudio, Input{Name: "x", Type: "colour"}), "not one of text"},
+		"a choice of nothing":  {run(OutputAudio, Input{Name: "x", Type: InputChoice}), "no choices"},
+		"min above max":        {run(OutputAudio, Input{Name: "x", Type: InputInt, Min: &one, Max: &zero}), "min above max"},
+		"required and default": {run(OutputAudio, Input{Name: "x", Type: InputInt, Required: true, Default: 3}), "one or the other"},
+		"a file's default":     {run(OutputAudio, Input{Name: "x", Type: InputImage, Default: "a.png"}), "cannot have a default"},
+		"twice":                {run(OutputAudio, Input{Name: "x", Type: InputText}, Input{Name: "x", Type: InputInt}), "declared twice"},
+	} {
+		if _, err := New([]Model{c.m}); err == nil || !strings.Contains(err.Error(), c.want) {
+			t.Errorf("%s: %v", name, err)
+		}
+	}
+}

internal/control/control.go

@@ -9,6 +9,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"log/slog"
+	"os"
 	"strings"
 	"sync"
 	"time"
@@ -360,7 +361,7 @@ func (c *Controller) endpoints() []endpoint.Info {
 		names := append([]string{m.Name}, m.Aliases...)
 
 		prof, _ := m.ProfileByName(rep.Profile)
-		out = append(out, endpoint.Info{
+		info := endpoint.Info{
 			ID:       rep.ID,
 			URL:      strings.TrimRight(rep.Endpoint, "/"),
 			Models:   names,
@@ -369,7 +370,47 @@ func (c *Controller) endpoints() []endpoint.Info {
 			Pool:     rep.Pool,
 			Weight:   rep.Weight,
 			Priority: prof.Priority,
-		})
+		}
+		if m.Shared != nil {
+			// One replica answering for every member of its environment:
+			// offered under their names, each sent its own workflow and
+			// checkpoint. Its own hidden name nobody asks for.
+			info.Models = nil
+			info.Comfy = map[string]endpoint.ComfyRoute{}
+			ok := true
+			for _, sm := range m.Shared.Members {
+				w, err := c.workflow(sm.Workflow)
+				if err != nil {
+					c.log.Warn("a shared ComfyUI member's workflow could not be read; its replica is not offered",
+						"model", sm.Name, "replica", rep.ID, "err", err)
+					ok = false
+					break
+				}
+				route := endpoint.ComfyRoute{Workflow: w, Checkpoint: sm.Checkpoint}
+				for _, n := range append([]string{sm.Name}, sm.Aliases...) {
+					info.Models = append(info.Models, n)
+					info.Comfy[n] = route
+				}
+				if info.Workflow == "" {
+					info.Workflow, info.UpstreamModel = w, sm.Checkpoint
+				}
+			}
+			if ok {
+				out = append(out, info)
+			}
+			continue
+		}
+		if prof.Engine == catalog.EngineComfyUI {
+			workflow, ckpt := m.ComfyWorkflowFor(prof)
+			w, err := c.workflow(workflow)
+			if err != nil {
+				c.log.Warn("a ComfyUI model's workflow could not be read; its replica is not offered",
+					"model", m.Name, "replica", rep.ID, "err", err)
+				continue
+			}
+			info.Workflow, info.UpstreamModel = w, ckpt
+		}
+		out = append(out, info)
 	}
 	return append(out, c.externalEndpoints()...)
 }
@@ -412,23 +453,45 @@ func (c *Controller) externalEndpoints() []endpoint.Info {
 		if m.IsPeer() {
 			id = "peer:" + m.Name
 		}
+		engine, workflow := endpoint.EngineExternal, ""
+		if m.External.API == catalog.APIComfyUI {
+			w, err := c.workflow(m.External.Workflow)
+			if err != nil {
+				c.log.Warn("a ComfyUI model's workflow could not be read; not offered", "model", m.Name, "err", err)
+				continue
+			}
+			engine, workflow = endpoint.EngineComfyUI, w
+		}
 		out = append(out, endpoint.Info{
 			ID: id, URL: strings.TrimRight(m.External.URL, "/"),
 			Models: append([]string{m.Name}, m.Aliases...), APIKey: key,
-			Engine: endpoint.EngineExternal, Pool: "external", Weight: 1,
+			Engine: engine, Pool: "external", Weight: 1,
 			UpstreamModel: m.External.Model,
 			Peer:          m.External.Peer, PeerCluster: cluster, PeerTags: tags,
+			Workflow: workflow,
 		})
 	}
 	return out
 }
 
+// workflow is a ComfyUI workflow as the router is sent it: a built-in's
+// name as it is, a file read here, on the control plane the catalog says it
+// is on, and sent as the workflow itself.
+func (c *Controller) workflow(w string) (string, error) {
+	if !strings.ContainsAny(w, "/.") {
+		return w, nil
+	}
+	b, err := os.ReadFile(w)
+	return string(b), err
+}
+
 // fingerprint summarizes a list so an unchanged one can be skipped.
 func fingerprint(infos []endpoint.Info) string {
 	var b strings.Builder
 	for _, i := range infos {
-		fmt.Fprintf(&b, "%s|%s|%s|%s|%v|%g|%d|%s|%s|%s|%t|%x;", i.ID, i.URL, i.Engine, i.Pool, i.Models, i.Weight,
-			i.Priority, i.UpstreamModel, i.Peer, i.PeerCluster, i.PeerTags, sha256.Sum256([]byte(i.APIKey)))
+		fmt.Fprintf(&b, "%s|%s|%s|%s|%v|%g|%d|%s|%s|%s|%t|%x|%x;", i.ID, i.URL, i.Engine, i.Pool, i.Models, i.Weight,
+			i.Priority, i.UpstreamModel, i.Peer, i.PeerCluster, i.PeerTags, sha256.Sum256([]byte(i.APIKey)),
+			sha256.Sum256([]byte(i.Workflow)))
 	}
 	return b.String()
 }

internal/control/modelserve/canary.go

@@ -92,7 +92,7 @@ func (s *Server) addCandidate(ctx context.Context, j *Job, p prepared, cn catalo
 		s.step(j, "smoke test", Running, "asking "+r.ID+" to say hello")
 		var reply string
 		var tps float64
-		if reply, tps, err = s.smoke(ctx, r, cand); err == nil {
+		if reply, tps, err = s.smoke(ctx, r, cand, s.embeds(cand)); err == nil {
 			s.step(j, "smoke test", Done, fmt.Sprintf("answered at %.1f tokens/s: %q", tps, reply))
 		} else {
 			s.step(j, "smoke test", Failed, err.Error())

internal/control/modelserve/modelserve.go

@@ -153,6 +153,13 @@ type Request struct {
 	// is written into the catalog, where clients and editors read it. Check
 	// a running replica with llmgw ctl tool-check before saying so.
 	Tools bool `json:"tools,omitempty"`
+	// Embeddings serves it as an embedding model, which its GGUF header
+	// says by itself for most: --embedding, many slots, a batch that holds
+	// a whole passage, /v1/embeddings.
+	Embeddings bool `json:"embeddings,omitempty"`
+	// sized is the caller having said --ctx-pool or --context-length, which
+	// an embedding model's defaults then leave alone.
+	sized bool
 	// CPUCores is what a replica computes on; zero takes half the smallest
 	// node it fits on.
 	CPUCores int `json:"cpu_cores,omitempty"`
@@ -268,6 +275,7 @@ func (s *Server) Start(req Request) (Job, error) {
 	if req.GuardFormat != "" && req.Replicas == 0 {
 		return Job{}, errors.New("a judge model must always run: give it --replicas 1 or more, not --on-demand")
 	}
+	req.sized = req.CtxPool > 0 || req.ContextLength > 0
 	if req.CtxPool <= 0 {
 		req.CtxPool = 16384
 	}
@@ -473,6 +481,30 @@ func (s *Server) run(j *Job) {
 		}
 		header = v.Header
 	}
+	if header.Embedding {
+		req.Embeddings = true
+	}
+	if req.Embeddings && !req.sized {
+		// Many passages at once rather than four: an import of a hundred
+		// thousand chunks went at the pace of four slots with the card a
+		// third busy.
+		req.ContextLength, req.CtxPool = embedSlotTokens, embedSlotTokens*embedSlots
+	}
+	// On one card, the weights and the context's cache have to fit it: a
+	// 70B with a 65536-token pool on a 24 GB card loaded its weights and then
+	// failed to make its context, every time, as did an 8B with 131072.
+	if len(layout) > 0 && layout[0].Class != "" && !layout[0].CPU {
+		fitted, why, err := fitPoolToCard(req, header, set.Bytes, layout[0].Class, max(layout[0].GPUsPerNode, 1))
+		if err != nil {
+			s.fail(j, "check", err)
+			return
+		}
+		if why != "" {
+			s.step(j, "check", Running, why)
+			req = fitted
+		}
+	}
+	j.Request = req
 	memGB := int((header.MemoryBytes(set.Bytes, req.CtxPool) + 1<<30 - 1) >> 30)
 	basis := fmt.Sprintf("weights %.1f GB + KV cache %.1f GB for %d tokens + engine",
 		gb(set.Bytes), gb(int64(req.CtxPool)*header.KVBytesPerToken()), req.CtxPool)
@@ -587,10 +619,24 @@ func profilesFor(layout []modelplan.Option, req Request, memGB, cores int) []cat
 // slots of 8192, and the gateway, told 32768, sent requests the engine then
 // refused.
 func llamaArgs(req Request) []string {
-	return []string{"--ctx-size", strconv.Itoa(req.CtxPool),
+	args := []string{"--ctx-size", strconv.Itoa(req.CtxPool),
 		"--parallel", strconv.Itoa(max(1, req.CtxPool/req.ContextLength))}
+	if req.Embeddings {
+		// A passage is embedded in one batch: with the default 512, one of
+		// 516 tokens was refused.
+		n := strconv.Itoa(req.ContextLength)
+		args = append([]string{"--embedding"}, append(args, "--batch-size", n, "--ubatch-size", n)...)
+	}
+	return args
 }
 
+// An embedding model's slots, when its caller did not size them: passages
+// of up to a thousand tokens, thirty-two at a time.
+const (
+	embedSlotTokens = 1024
+	embedSlots      = 32
+)
+
 // maxOutput is the longest answer the catalog allows: a quarter of the
 // context, from 1024 to 8192. 1024 everywhere cut an editor's agent off in
 // the middle of the file it was writing.
@@ -620,7 +666,7 @@ func (s *Server) addAndStart(ctx context.Context, j *Job, repo hf.Repo, set hf.F
 		RoutingProfile: "chat", ContextLength: req.ContextLength, MaxOutput: maxOutput(req.ContextLength),
 		Profiles:     profs,
 		Scaling:      catalog.Scaling{Min: req.Replicas, Max: max(req.Replicas, 1)},
-		Capabilities: catalog.Capabilities{Vision: req.Projector != "", Tools: req.Tools},
+		Capabilities: catalog.Capabilities{Vision: req.Projector != "", Tools: req.Tools, Embeddings: req.Embeddings},
 		Origin:       &catalog.Origin{Repo: repo.ID, Revision: repo.Revision, Files: originFiles(set)},
 	}
 	if req.GuardFormat != "" {
@@ -655,7 +701,7 @@ func (s *Server) addAndStart(ctx context.Context, j *Job, repo hf.Repo, set hf.F
 
 	// 6. Does it answer.
 	s.step(j, "smoke test", Running, "asking "+rep.ID+" to say hello")
-	reply, tps, err := s.smoke(ctx, rep, name)
+	reply, tps, err := s.smoke(ctx, rep, name, req.Embeddings)
 	if err != nil {
 		s.fail(j, "smoke test", err)
 		return
@@ -859,7 +905,10 @@ func (s *Server) waitReady(ctx context.Context, j *Job, name string, hardware bo
 }
 
 // smoke sends one short request straight to the replica, with its engine key.
-func (s *Server) smoke(ctx context.Context, r reconciler.Replica, name string) (string, float64, error) {
+func (s *Server) smoke(ctx context.Context, r reconciler.Replica, name string, embeddings bool) (string, float64, error) {
+	if embeddings {
+		return s.smokeEmbeddings(ctx, r, name)
+	}
 	body, _ := json.Marshal(map[string]any{
 		"model":      name,
 		"max_tokens": 32,
@@ -989,3 +1038,77 @@ func pickSafetensors(repo hf.Repo, _ Request) (hf.FileSet, error) {
 	}
 	return set, nil
 }
+
+// smokeEmbeddings asks an embedding model for one vector, and says its
+// length: an embedding model does not chat.
+func (s *Server) smokeEmbeddings(ctx context.Context, r reconciler.Replica, name string) (string, float64, error) {
+	body, _ := json.Marshal(map[string]any{"model": name, "input": "hello"})
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		strings.TrimRight(r.Endpoint, "/")+"/v1/embeddings", bytes.NewReader(body))
+	if err != nil {
+		return "", 0, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	if k := s.deps.Fleet.EngineKey(r.ID); k != "" {
+		req.Header.Set("Authorization", "Bearer "+k)
+	}
+	resp, err := s.deps.HTTP.Do(req)
+	if err != nil {
+		return "", 0, err
+	}
+	defer resp.Body.Close()
+	b, _ := io.ReadAll(io.LimitReader(resp.Body, 4<<20))
+	if resp.StatusCode != http.StatusOK {
+		return "", 0, fmt.Errorf("the replica answered %s: %s", resp.Status, strings.TrimSpace(string(b)))
+	}
+	var out struct {
+		Data []struct {
+			Embedding []float64 `json:"embedding"`
+		} `json:"data"`
+	}
+	if err := json.Unmarshal(b, &out); err != nil || len(out.Data) == 0 || len(out.Data[0].Embedding) == 0 {
+		return "", 0, fmt.Errorf("the replica answered no vector: %s", strings.TrimSpace(string(b)))
+	}
+	return fmt.Sprintf("a vector of %d dimensions", len(out.Data[0].Embedding)), 0, nil
+}
+
+// embeds is whether the catalog serves name as an embedding model, for a
+// smoke test of one already there (a canary, an update).
+func (s *Server) embeds(name string) bool {
+	if s.deps.Current == nil {
+		return false
+	}
+	for _, m := range s.deps.Current() {
+		if m.Name == name {
+			return m.Capabilities.Embeddings
+		}
+	}
+	return false
+}
+
+// fitPoolToCard shrinks a context pool the cards cannot hold to one they
+// can, saying so, and refuses weights that do not fit at all. The slots stay
+// as many as asked while each keeps 2048 tokens, then fewer.
+func fitPoolToCard(req Request, h gguf.Header, weights int64, class string, gpus int) (Request, string, error) {
+	maxTok := h.PoolThatFits(weights, gguf.ClassMemGB(class), gpus)
+	switch {
+	case maxTok == 0 || req.CtxPool <= maxTok:
+		return req, "", nil
+	case maxTok < 0:
+		return req, "", fmt.Errorf("its weights (%.1f GB) do not fit %d card(s) of %s with room to run: "+
+			"choose a smaller quantisation, or more cards", gb(weights), gpus, class)
+	}
+	slots := max(1, req.CtxPool/max(req.ContextLength, 1))
+	for slots > 1 && maxTok/slots < 2048 {
+		slots--
+	}
+	per := (maxTok / slots) / 1024 * 1024
+	if per < 1024 {
+		return req, "", fmt.Errorf("its weights (%.1f GB) leave room on %s for a context of %d tokens only",
+			gb(weights), class, maxTok)
+	}
+	was := req.CtxPool
+	req.ContextLength, req.CtxPool = per, per*slots
+	return req, fmt.Sprintf("a %d-token pool does not fit %s beside %.1f GB of weights: %d slots of %d tokens instead",
+		was, class, gb(weights), slots, per), nil
+}

internal/control/modelserve/modelserve_test.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/binary"
 	"fmt"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/gguf"
 	"net/http"
 	"net/http/httptest"
 	"slices"
@@ -397,3 +398,33 @@ func TestOnlyTheLastFinishedJobsAreRemembered(t *testing.T) {
 		t.Error("the oldest finished job is still remembered")
 	}
 }
+
+func TestAnEmbeddingModelIsServedForEmbedding(t *testing.T) {
+	// Four slots and a 512-token batch: an import went at four passages a
+	// pass, and one passage of 516 tokens was refused.
+	args := strings.Join(llamaArgs(Request{Embeddings: true, ContextLength: embedSlotTokens,
+		CtxPool: embedSlotTokens * embedSlots}), " ")
+	for _, want := range []string{"--embedding", "--ctx-size 32768", "--parallel 32", "--batch-size 1024", "--ubatch-size 1024"} {
+		if !strings.Contains(args, want) {
+			t.Errorf("%q not in %q", want, args)
+		}
+	}
+	if args := strings.Join(llamaArgs(Request{ContextLength: 4096, CtxPool: 16384}), " "); strings.Contains(args, "embedding") {
+		t.Errorf("a chat model got %q", args)
+	}
+}
+
+func TestAPoolTheCardCannotHoldIsShrunkNotStarted(t *testing.T) {
+	h := gguf.Header{Architecture: "apertus", BlockCount: 32, HeadCount: 32, HeadCountKV: 8, EmbeddingLength: 4096}
+	req := Request{CtxPool: 131072, ContextLength: 32768}
+	got, why, err := fitPoolToCard(req, h, int64(8.5*(1<<30)), "6000-24g", 1)
+	if err != nil || why == "" || got.CtxPool > 105000 || got.CtxPool/got.ContextLength != 4 {
+		t.Errorf("fitted %+v %q %v", got, why, err)
+	}
+	if _, _, err := fitPoolToCard(req, h, int64(30*(1<<30)), "6000-24g", 1); err == nil {
+		t.Error("weights larger than the card were not refused")
+	}
+	if got, why, _ := fitPoolToCard(Request{CtxPool: 16384, ContextLength: 4096}, h, int64(8.5*(1<<30)), "6000-24g", 1); why != "" || got.CtxPool != 16384 {
+		t.Errorf("a pool that fits was changed: %+v %q", got, why)
+	}
+}

internal/control/modelserve/updates.go

@@ -689,7 +689,7 @@ func (s *Server) replace(ctx context.Context, j *Job, name string) error {
 			}
 			s.step(j, "replicas", Done, fmt.Sprintf("%d replaced", len(old)))
 			s.step(j, "smoke test", Running, "asking "+ready[0].ID+" to say hello")
-			reply, tps, err := s.smoke(ctx, ready[0], name)
+			reply, tps, err := s.smoke(ctx, ready[0], name, s.embeds(name))
 			if err != nil {
 				s.step(j, "smoke test", Failed, err.Error())
 				return err

internal/control/modelsvc/modelsvc.go

@@ -87,8 +87,8 @@ func (s *Service) Sources(ctx context.Context) (map[string][]catalog.Model, erro
 	}
 	out := map[string][]catalog.Model{}
 	for _, m := range c.Models() {
-		if m.Source != "" {
-			out[m.Source] = append(out[m.Source], m)
+		for _, src := range m.WeightSources() {
+			out[src] = append(out[src], m)
 		}
 		for _, ad := range m.Adapters {
 			out[ad.Source] = append(out[ad.Source], m)

internal/control/reconciler/adopt.go

@@ -111,7 +111,22 @@ func (r *Reconciler) Adopt(nodeID string, shards []AdoptedShard) (unclaimed []Ad
 		}
 		r.mergeAdopted(rep, group)
 		r.replicas[replicaID] = rep
-
+		// An on-demand model that is up was asked for, by somebody this
+		// control plane has not heard of: it started before a restart or a
+		// change of leader. Without this it reads as wanted by nobody and is
+		// drained on the next pass — every awake on-demand model, at every
+		// failover. It gets a whole idle timeout from now instead.
+		if _, asked := r.wanted[m.Name]; !asked && m.Scaling.OnDemand() {
+			r.wanted[m.Name] = r.now()
+		}
+		// And counted as used now, for the same reason. Left unknown it was
+		// never idle enough to evict: a 3D job waited out the whole fifteen
+		// minutes of a picture model nobody had asked for since the restart.
+		// A replica in use is reported by the router within seconds, and
+		// moves this forward.
+		if m.Scaling.OnDemand() {
+			rep.LastUsedAt = r.now()
+		}
 	}
 	return unclaimed
 }