fix(google): make codeExecutionResult.output optional in response schema#12361
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dancer merged 2 commits intovercel:mainfrom Feb 9, 2026
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Gemini 3 Flash omits the `output` field in `codeExecutionResult` when code execution produces no text output (e.g., only saves files via PIL). This caused `AI_APICallError: Invalid JSON response` because the Zod schema required `output` to be a string. Changes: - Make `output` field `.nullish()` in the `codeExecutionResult` schema within `getContentSchema()` (affects both response and chunk schemas) - Default missing `output` to empty string in both doGenerate and doStream code paths - Add regression tests for both generateText and streamText with missing output field Closes vercel#12217
dancer
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Feb 9, 2026
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Background
When using
vertex.tools.codeExecution({})with Gemini 3 Flash (gemini-3-flash-preview),generateTextthrowsAI_APICallError: Invalid JSON responsebecause the Zod response schema requirescodeExecutionResult.outputto be astring. However, Gemini 3 Flash omits theoutputfield entirely when code execution produces no text output (e.g., only saves files via PIL without printing to stdout).Summary
outputfield.nullish()in thecodeExecutionResultZod schema withingetContentSchema(), which is shared by both the response and chunk schemasoutputto an empty string ('') in bothdoGenerateanddoStreamcode paths to maintain a consistentstringtype downstreamdoGenerateanddoStreamwith a missingoutputfieldManual Verification
@ai-sdk/googlepass (10 test files)pnpm type-check:full)Checklist
pnpm changesetin the project root)Closes #12217