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fix(session): recover orphan reasoning stream parts - #41630
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The AI SDK enqueues a non-fatal "reasoning part <id> not found" / "text part <id> not found" error part when a reasoning/text delta arrives with no preceding *-start block (common with OpenAI-compatible and Anthropic proxies). The adapter promoted every error part to a fatal Effect.fail, aborting the turn and spamming logs. Recognize these SDK-internal orphan stream-state errors and drop them instead of failing; genuine errors still fail.
Proxies that stream deltas without a preceding *-start caused the processor to drop the delta and any providerMetadata riding on it, including Anthropic thinking signatures. Repair the stream in the adapter by emitting the missing start before the delta.
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The following comment was made by an LLM, it may be inaccurate: Related PRs Found#39287 -
#26167 -
These are related PRs in the same stream recovery space, but #39287 is the direct predecessor that this PR builds upon. |
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Issue for this PR
Closes#36241
Type of change
What does this PR do?
AI SDK reports a missing reasoning/text start as an in-band
part ... not founderror, then keeps streaming. OpenCode promoted that bookkeeping error to a fatal turn failure.Emit a missing start before orphan deltas or end events, preserve provider metadata, and ignore only matching AI SDK bookkeeping errors. Real provider errors still fail.
Based on #39287 by DragonBaiMo, rebased onto current
dev, with coverage moved into current adapter suite. Existing PR no longer passes that suite after recent adapter changes.How did you verify your code works?
bun test test/session/llm.test.ts: 29 passbun typecheckfrompackages/opencodeScreenshots / recordings
Not applicable.
Checklist