[v5.0] reproduction: AIInvalidPromptError "messages must be a ModelMessage" caused by - #20283
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[v5.0] reproduction: AIInvalidPromptError "messages must be a ModelMessage" caused by#20283ai-sdk-factory[bot] wants to merge 1 commit into
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Co-authored-by: Aayush Kapoor <83492835+aayush-kapoor@users.noreply.github.com>
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closed via #20285
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…ng undefined object properties (#20285) ## Background Manually reusing generated tool-result messages caused streamText and generateText continuations to reject valid outputs containing nested undefined object properties. ## Root Cause The recursive JSON value schema required every object property to be a JSONValue and rejected retained undefined values. The reproduction confirmed JSON serialization removed those properties and made continuation succeed. ## Summary Updated the internal JSON validator to permit undefined object properties, removed reproduction-only artifacts, and added an ai patch changeset. ## Testing Added a standardizePrompt regression test covering nested undefined properties in JSON tool-result arrays. ## End-to-end Validation - `pnpm -C examples/ai-functions exec tsx src/reproduction/issue-10893-undefined-tool-result-array.ts` via immutable replay exited successfully without the original bug signal. ## Related Issues Fixes #10893 Closes #20283 --------- Co-authored-by: ai-sdk-factory <308175966+ai-sdk-factory@users.noreply.github.com> Co-authored-by: Aayush Kapoor <83492835+aayush-kapoor@users.noreply.github.com> Co-authored-by: wladimiiir <3164600+wladimiiir@users.noreply.github.com>
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Bug
AI_InvalidPromptError ("messages must be a ModelMessage[]") caused by undefined properties in tool-result arrays
Reproduction
release-v5.0withai5.0.251, manually reusing tool-response messages caused bothstreamTextandgenerateTextto reject the expected continuation withAI_InvalidPromptErrorcaused byAI_TypeValidationError.startedAtandcompletedAtas own properties withundefinedvalues;packages/ai/src/types/json-value.tsrejects those values, andpackages/ai/src/prompt/standardize-prompt.tsreports the misleadingModelMessage[]error.undefinedvalues—not heterogeneous arrays with missing keys—are the actual failure condition.nullsucceeded, and automatic multi-step execution usingstopWhen: stepCountIs(2)also succeeded.examples/ai-functions/src/reproduction/issue-10893-undefined-tool-result-array.ts, supported byexamples/ai-functions/package.json,examples/ai-functions/tsconfig.json, andpnpm-lock.yaml; it expects manual continuation to succeed but observes both APIs rejecting it.Related Issues
Reproduces #10893