NodeView carries engine_versions and compute_capabilities; ctl nodes shows llamacpp b10991 and 6000-24g (7.5). A profile's engine_version restricts it to nodes whose engine version starts with it, and explain-placement says which version a node has, or which engines it has when it lacks the one asked for. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>