fix(ai): exclude client-side tool execution from streamText step/chunk timeouts - #19993
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…k timeouts Clear per-step model timers on model-call-end so stepMs and chunkMs measure model silence only. totalMs and toolMs remain active during tools. Fixes vercel#17310
Add regression test for async generator tools whose preliminary tool-result chunks do not reset chunkMs. Clarify which chunk types reset the timer in docs and JSDoc, per production feedback on vercel#17310.
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Background
timeout.chunkMs/stepMsstay armed while client-side tools run. A healthy long-running tool can therefore abort the stream even thoughtoolMsalready owns that phase. This addresses #17310.Summary
stepMs,firstChunkMs,chunkMs) onmodel-call-end, before pending client tool execution completes.totalMsandtoolMsactive during tools; re-arm fresh step/chunk timers on later model calls.streamTextvsgenerateTextstepMsdifference.End-to-End Verification
Unit coverage with
MockLanguageModelV4(no live provider keys required). The issue reproduction (tool longer thanchunkMs) now completes instead of aborting.Checklist
pnpm changesetin the project root)Testing
Related Issues
Fixes #17310