Tool call information.
Represents a complete tool call made by an LLM, including the call ID and function details.
Optional
Opaque vendor-issued reasoning echo token attached to a tool call. Maps to Gemini thoughtSignature when it is attached to a functionCall part. The value is preserved verbatim for stateless replay.
thoughtSignature
functionCall
Tool call information.
Represents a complete tool call made by an LLM, including the call ID and function details.