[drewstone]

Problem. agent-runtime runs modelSilenceMs (cut a silent model call, never a running tool) only on a bridge route whose GET /v1/capabilities?model= answer says toolCallSpans: true (tangle-network/agent-runtime#1885). No backend declared it, so the bound was refused on every route. Baseline, served disco bridge :8899 at cdf9292, 2026-10-20 01:08Z: /v1/capabilities?model=opencode/... has no toolCallSpans.

Change. #266 made opencode report each tool call at its start, and its finished part already carries the outcome. Backend.toolCallSpans is a new optional field; OpencodeBackend sets it, and the capabilities answer includes toolCallSpans: true for a backend that sets it. Other backends are unchanged: claude reports a call at start but never its result, and codex reports calls only when they finish.

Condition. The start signal comes from the plugin in the turn's private config directory, which every turn with an AgentProfile has. agent-runtime's bridge executor always sends agent_profile.

Proof. tests/retained-sessions.test.ts: the route serves toolCallSpans: true for a backend that declares it, and not for the generic backends. Live proof after the disco bridges roll: /v1/capabilities on :8899 answers toolCallSpans: true for an opencode model, and agent-runtime's route preflight admits modelSilenceMs.

Cost / rollback. Adds one field to the JSON answer. Older runtimes ignore unknown keys. Fix forward.

Run ID: run_0692ee937793d1d6d1ea72517f5a9ee7

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-20T01:12:18.385563Z	caf32c3	PR opened

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[tangletools]

✅ Auto-approved PR — caf32c33

Blanket team auto-approval is intentional. This is not a code review.
No automated review runs on this PR. This approval rests on the rule above alone.

_{tangletools · auto-approval · reason: blanket_auto_approve · 2026-10-20T01:13:04Z}

[drewstone]

Live proof after merge (01:40Z). discovery-lab moved disco-bridge@8899/8900/8901 to 77c020d at 01:35:44Z. Authenticated GET /v1/capabilities?model=opencode/glm-5.3 on :8899 and :8900 now answers toolCallSpans: true (at cdf9292 the field was absent). agent-runtime 0.335.0's bridgeModelRouteRefusal, run verbatim from the published tarball against :8899 with modelSilenceMs: 900000, returns no refusal. :8901 answers 404 because it has no opencode backend, which is expected.