from_function() — langchain Function Reference

Architecture documentation for the from_function() function in simple.py from the langchain codebase.

Function python AgentOrchestration ActionLogic

Entity Profile

AgentOrchestration→ ActionLogic→ from_function() — langchain Function Reference

Dependency Diagram

graph TD
  a4750a39_8afe_6ac4_ad0b_49c77bf6dcda["from_function()"]
  4ddde15c_138a_6971_91c4_325c8c3034dd["Tool"]
  a4750a39_8afe_6ac4_ad0b_49c77bf6dcda -->|defined in| 4ddde15c_138a_6971_91c4_325c8c3034dd
  style a4750a39_8afe_6ac4_ad0b_49c77bf6dcda fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/tools/simple.py lines 165–204

    def from_function(
        cls,
        func: Callable | None,
        name: str,  # We keep these required to support backwards compatibility
        description: str,
        return_direct: bool = False,  # noqa: FBT001,FBT002
        args_schema: ArgsSchema | None = None,
        coroutine: Callable[..., Awaitable[Any]]
        | None = None,  # This is last for compatibility, but should be after func
        **kwargs: Any,
    ) -> Tool:
        """Initialize tool from a function.

        Args:
            func: The function to create the tool from.
            name: The name of the tool.
            description: The description of the tool.
            return_direct: Whether to return the output directly.
            args_schema: The schema of the tool's input arguments.
            coroutine: The asynchronous version of the function.
            **kwargs: Additional arguments to pass to the tool.

        Returns:
            The tool.

        Raises:
            ValueError: If the function is not provided.
        """
        if func is None and coroutine is None:
            msg = "Function and/or coroutine must be provided"
            raise ValueError(msg)
        return cls(
            name=name,
            func=func,
            coroutine=coroutine,
            description=description,
            return_direct=return_direct,
            args_schema=args_schema,
            **kwargs,
        )