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fix(ai): handle missing reasoning-start in streamText eventProcessor - #13110
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turnerburchard wants to merge 4 commits into
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turnerburchard wants to merge 4 commits into
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When a provider emits reasoning-delta or reasoning-end events without a preceding reasoning-start (e.g. OpenAI Responses API with empty or malformed reasoning blocks), the eventProcessor now auto-creates the reasoning entry instead of emitting an error that terminates the stream. This is the same class of bug fixed in vercel#12055 for extractReasoningMiddleware, but in a different code path. Fixes vercel#12054
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Running into this with opus 4.7 and amazon bedrock |
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Summary
When a provider emits
reasoning-deltaorreasoning-endstream events without a precedingreasoning-start, theeventProcessorinstreamTextnow auto-creates the reasoning entry instead of emitting an error event that terminates the stream.This is the same class of bug fixed in #12055 for
extractReasoningMiddleware, but in theeventProcessorTransformStream insidestreamText.Context
We hit this with OpenAI's Responses API (
reasoningSummary: 'auto') — on a trivial input, the API intermittently sentreasoning-deltaevents without a precedingreasoning-start, producing repeated errors:Changes
stream-text.ts: Whenreasoning-deltaorreasoning-endarrives without an active reasoning entry, auto-create one (matching the approach from Fixes to reasoning-0 not found error #12055) instead of emitting an errorstream-text.test.ts: Two new test cases covering both scenariosTest plan
Relates to #12054