[dezren39]

Closes #5294

Adds configurable OPENCODE_ROUTE_PROXY_LEAF_TIMEOUT_MS (default 3000 ms) to bound each leaf request until response headers arrive. A per-leaf timeout is recorded as outcome=timeout, error_tag=Transport, with failed_over_to, and the walk continues; client aborts and the existing whole-walk deadline remain terminal.

Adds a proxy regression test proving a hung first leaf is shed and a live second leaf completes within the client window, with both attempts recorded.

Client-side verification: OpenCode reads input.model.routing.policy.firstTokenTimeoutMs; it is configurable via experimental.model_routes.<route>.health.firstTokenTimeoutMs, defaults to 10000 ms, and false disables it. The proxy's 3000 ms default is therefore below the default no-output window.

Tests: node --test bin/opencode-route-proxy.test.mjs (35 passed).

---

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-04T07:15:46.520829Z	6d6e7bc	PR opened

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Reviewed commit: 6d6e7bc1af

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[chatgpt-codex-connector]

Preserve a longer generation deadline for non-streaming requests

For requests with stream omitted or false, an upstream can legitimately wait until the entire completion is generated before sending response headers. Applying this 3-second timer unconditionally therefore aborts healthy non-streaming generations that take longer than three seconds, retries them on subsequent leaves, and ultimately returns 502 if none finishes within that limit. Previously these requests could complete within the existing whole-request deadline. Apply the short first-response timeout only to streaming requests, or provide a separate non-streaming deadline that accommodates full generation.

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