Method●Since v0.1

on_tool_start

Run when the tool starts running.

on_tool_start(
  self,
  serialized: dict[str, Any] | None,
  input_str: str,
  run_id: UUID | None = None,
  parent_run_id: UUID | None = None,
  **kwargs: Any = {}
) -> AsyncCallbackManagerForToolRun

Parameters

Name	Type	Description
`serialized`*	`dict[str, Any] \| None`	The serialized tool.
`input_str`*	`str`	The input to the tool.
`run_id`	`UUID \| None`	Default:`None` The ID of the run.
`parent_run_id`	`UUID \| None`	Default:`None` The ID of the parent run.
`**kwargs`	`Any`	Default:`{}` Additional keyword arguments.

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on_tool_start

Parameters

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on_tool_start

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