fix: preserve thought_signature on tool call parts for Gemini 3#811
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fix: preserve thought_signature on tool call parts for Gemini 3#811
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The thinking signature was only preserved for Anthropic's namespace, causing Gemini 3 models to fail with "Function call is missing a thought_signature" on the second turn of tool-calling conversations. - Extract signature from google.thoughtSignature and vertex.thoughtSignature - Store signatureProvider to restore the correct namespace on output - Add tests for Google and Vertex signature extraction Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The previous fix only handled thought_signature on reasoning parts, but Gemini 3 also requires thought_signature on functionCall parts in the conversation history. This was the actual root cause of the "Function call is missing a thought_signature" error. - Add providerMetadata field to ToolCallPart schema - Preserve providerMetadata from AI SDK tool call results - Pass providerMetadata as providerOptions when converting back to AI SDK messages Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Follow-up to #809. The previous fix handled thought_signature on reasoning parts, but Gemini 3 also requires thought_signature on functionCall parts in the conversation history. This was the actual root cause.
providerMetadatafield toToolCallPartschema to store provider-specific metadata (e.g., Google'sthoughtSignature)providerMetadatafrom AI SDK tool call results when building tool call partsproviderMetadataasproviderOptionswhen converting back to AI SDK messagesTest plan
bun run typecheckpasses (24/24)bun run testpasses (all packages)🤖 Generated with Claude Code