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…t in tool loops (vercel#18515) ## 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 vercel#18513 Closes vercel#18514 Closes vercel#18546 --------- Co-authored-by: ai-sdk-factory <308175966+ai-sdk-factory@users.noreply.github.com> Co-authored-by: Astro-Han <255364436+Astro-Han@users.noreply.github.com>
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Background
@ai-sdk/open-responsesparsed provider reasoning items into assistantreasoningparts, but silently dropped those parts when the assistant output was replayed in a subsequent tool-loop request.The live-provider investigation in #18512 captured the missing reasoning item, but DeepSeek accepted that request when its provider-issued tool call ID was retained. The provider-free reproduction in #18514 isolated the serialization defect independently of that provider behavior.
Summary
reasoning_textcontent.@ai-sdk/open-responses.End-to-End Verification
Ran the provider-free two-step reproduction:
pnpm -C examples/ai-functions exec tsx src/reproduction/issue-18511-open-responses-reasoning-round-trip.tsIt completed successfully with the expected second-request ordering:
Verification
pnpm --filter @ai-sdk/open-responses testpnpm --filter @ai-sdk/open-responses buildpnpm --filter @example/ai-functions type-checkpnpm checkpnpm type-check:fullChecklist
pnpm changesetin the project root)Related Issues
Fixes #18511
Fixes #18513
Closes #18512
Closes #18514
Closes #18515
Co-authored by Co-authored-by: Astro-Han 255364436+Astro-Han@users.noreply.github.com