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ilkerandClaude Opus 5 2373726efd Agent stream: connect the fleet to the control plane 
One bidirectional connect-go stream per node, carrying registration, heartbeats
and shard status up, and start, stop and drain down. The agent dials out: GPU
nodes sit behind firewalls far more often than a control plane does, and an
outbound connection needs no inbound rule on every node in the fleet.

- registration carries the whole hardware inventory, so there is no separate
  discovery call and a reconnecting agent refreshes what the scheduler knows.
  The fabric labels travel with it; they cannot be inferred from the wire, so
  losing them in transit would silently disable multi-node placement.
- agentsvc is both the stream handler and the reconciler's dispatcher, because
  it holds the open streams and is therefore the only thing that can deliver a
  command to a node.
- the agent validates a profile before launching anything, since an engine that
  refuses a profile does so after minutes of loading, then supervises the
  process and reports every transition with the engine's output tail on failure.
- reconnects forever with jittered backoff. A control plane restart must not
  require touching every GPU node, and a fleet must not reconnect in lockstep
  and knock it over again. Engines keep serving throughout, because the router
  talks to them directly.

llmgw agent is real now, and llmgw server runs a control plane whenever any
model declares a profile. The static endpoint list stays for router-only runs.

Verified with real binaries as separate processes: the agent registers, a
replica is placed, an engine launches through the vLLM adapter's actual argument
construction, streaming traffic is served, and killing the agent moves the node
through unreachable to lost with placement explaining why nothing can run.

config.Model and catalog.Model were the same thing described twice, so the
router now reads catalog entries directly and the validation rules live in one
place.

Still missing: mTLS. The stream is plaintext HTTP/2 and must stay on a trusted
network until that lands.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-09-16 02:48:21 +02:00

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