feat(google-genai): Support thought signatures for Gemini 3 Pro function calling #4977
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…ion calling Add thought signature support required by Gemini 3 Pro when using function calling with includeThoughts enabled. Thought signatures preserve reasoning context during the internal tool execution loop. Changes from original implementation: - Attach thought signatures to functionCall parts per Google specification (not to text parts or separate empty parts) - Clarify in documentation that validation applies only to the current turn's function calling loop, not to historical conversation messages - Add integration tests validating function calls with signatures Key behaviors: - Signatures are extracted from model responses and stored in message metadata - During internal tool execution, signatures are correctly attached to functionCall parts when sending back function responses - Handles both parallel and sequential function calls correctly: - Parallel: only first functionCall gets the signature (per API spec) - Sequential: each step's first functionCall gets its signature - Previous turn signatures in conversation history are not validated by the API See: https://ai.google.dev/gemini-api/docs/thought-signatures Signed-off-by: Dan Dobrin <[email protected]> Signed-off-by: Mark Pollack <[email protected]>
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@ddobrin please review. |
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Looks good @markpollack |
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Summary
includeThoughtsenabledfunctionCallparts per Google specification (not to text parts)Key Behaviors
functionCallpartsDocumentation
internalToolExecutionEnabled=falseTest Plan
See: https://ai.google.dev/gemini-api/docs/thought-signatures
Signed-off-by: Dan Dobrin [email protected]
Signed-off-by: Mark Pollack [email protected]