fix: preserve assistant reasoning when replaying Open Responses output in tool loops - #18515
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ai-sdk-factory[bot] wants to merge 3 commits into
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fix: preserve assistant reasoning when replaying Open Responses output in tool loops#18515ai-sdk-factory[bot] wants to merge 3 commits into
ai-sdk-factory[bot] wants to merge 3 commits into
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Co-authored-by: Astro-Han <255364436+Astro-Han@users.noreply.github.com>
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Background
The published @ai-sdk/open-responses package lost assistant reasoning when its generated content was replayed in a tool loop, sending zero reasoning items after parsing one.
Root Cause
The assistant-content switch in convertToOpenResponsesInput handled only text and tool-call parts, so parsed reasoning parts fell through without serialization; the offline reproduction confirmed one reasoning part was read and zero were sent.
Summary
Assistant reasoning parts are now serialized as Open Responses reasoning items with reasoning_text content. The request type was tightened accordingly, and a patch changeset was added.
Testing
Added regression coverage asserting that assistant reasoning becomes a correctly shaped reasoning input item.
End-to-end Validation
pnpm -C packages/open-responses build;pnpm -C examples/ai-functions exec tsx src/reproduction/issue-18513-open-responses-reasoning-round-trip.ts— the offline round trip sent one reasoning item instead of zero and exited successfully.Related Issues
Fixes #18513
Closes #18514