fix(langchain): capture tool_call_id

[hassiebp]

Important

Adds tool_call_id to ToolMessage dictionary in _convert_message_to_dict() to enhance tool call tracking.

• Behavior:
  • Adds tool_call_id to ToolMessage dictionary in _convert_message_to_dict() in langchain.py.
  • Enhances tracking of tool calls by capturing tool_call_id in message conversion.

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Greptile Summary

Disclaimer: Experimental PR review

The PR updates the Langchain integration in langfuse-python to capture a new tool_call_id field from ToolMessage instances for enhanced tracing.

• Updated file: langfuse/callback/langchain.py – added tool_call_id extraction in _convert_message_to_dict.
• Ensures tool call identifiers are captured alongside existing message data.
• Change is localized and should propagate correctly to downstream logging and processing.
• Developers should verify that the new field is compatible with existing trace handling.

[greptile-apps]

LGTM

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[ajram23]

@hassiebp 👀 Does this make traces better???

[hassiebp]

@hassiebp 👀 Does this make traces better???

@ajram23 This should improve the "jump to playground" experience when originating off a Langchain trace with tool calls by relating tool calls by the LLM with the Tool response of the application