_on_tool_start() — langchain Function Reference

Architecture documentation for the _on_tool_start() function in core.py from the langchain codebase.

Function python Observability Tracers

Entity Profile

Observability→ Tracers→ _on_tool_start() — langchain Function Reference

Dependency Diagram

graph TD
  1a79da34_841b_fa36_05f8_37328a0bc3a5["_on_tool_start()"]
  70348e44_de0f_ccb4_c06a_8453289ed93e["_TracerCore"]
  1a79da34_841b_fa36_05f8_37328a0bc3a5 -->|defined in| 70348e44_de0f_ccb4_c06a_8453289ed93e
  style 1a79da34_841b_fa36_05f8_37328a0bc3a5 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/tracers/core.py lines 644–651

    def _on_tool_start(self, run: Run) -> Coroutine[Any, Any, None] | None:
        """Process the Tool Run upon start.

        Args:
            run: The tool run.
        """
        _ = run
        return None