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tool_call_id_validation
ai-agents-tool-call-id-validat-when-using-create-tool-calling-agent-with-an-input-770eceae
IFWhen using create_tool_calling_agent with an InputChat model that includes ToolMessage in the Union type for chat_history, and the chat history contains messages without 'tool_call_id' (e.g., HumanMessage), a KeyError occurs during pydantic validation.
THENEither remove the specific type hints from the chat_history field (use `List` without Union) or apply a custom validator. The root cause is in the ToolMessage validator expecting 'tool_call_id' unconditionally; a fix is to change `values["tool_call_id"]` to `values.get("tool_call_id")` in langchain_core/messages/tool.py. Updating the library is also recommended.
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