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feat(v2): fall back to the next model instead of only waiting - #41
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In v2, fallbackModels is now an ordered chain. When a request fails with a rate limit or a transient upstream error, a session whose model is in the chain is switched (session.switchModel) to the next model after it and retried about one second later. Once the chain is exhausted, fallbackMode decides: cycle back to the session's own model after a cooldown, retry-last, stop, or wait (never switch). A session whose model is not in the chain keeps the wait behaviour. The next real user prompt puts the session back on its own model. OpenCode 2.0.31 keeps retrying past attempt 5 (its ceiling is about 10), so the timer that resumed at attempt 5 pushed an empty user message into a turn that was still running. A turn is now resumed only after session.execution.failed with a retryable error; interrupted turns stay stopped. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- Leave sessions whose model is not in fallbackModels to OpenCode by default, as 2.0.x did; "otherModels": "wait" opts into retrying the same model after a cooldown. - Register nothing for a non-wait config without fallback models, so a default config still does nothing. - Validate otherModels in config and cover the compatibility cases in tests.
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What
Implements the v1-style fallback chain for the OpenCode v2 entry point (
v2.ts) instead of only supportingfallbackMode: "wait".fallbackModelsis an ordered chain: on a rate limit / transient upstream error the session switches to the next model and retries after ~1s.cycle/retry-last/stopbehave like their v1 counterparts.waitmode keeps its existing single-model, exponential-backoff behavior.session.execution.failed, so an interrupted turn is not resumed.Backward compatibility
index.ts, 1.x line) is untouched.fallbackModels, so a non-waitconfig registers nothing, exactly like 2.0.x.otherModels: "ignore").otherModels: "wait"opts into waiting on the same model, matching 2.0.x wait behavior.package.jsongoes 2.0.3 -> 2.1.0; publishing stays under theopencode-v2npm tag, solatestremains the 1.x line.Tests
npm run typecheckpasses.__tests__/config/watcher.test.tsfs.watch timing tests, which fail identically onmainon macOS; they are untouched by this branch and CI runs on Ubuntu.