Method from_function

libs/core/langchain_core/tools.py:676–699

Initialize tool from a function.

(
        cls,
        func: Optional[Callable],
        name: str,  # We keep these required to support backwards compatibility
        description: str,
        return_direct: bool = False,
        args_schema: Optional[Type[BaseModel]] = None,
        coroutine: Optional[
            Callable[..., Awaitable[Any]]
        ] = None,  # This is last for compatibility, but should be after func
        **kwargs: Any,
    )

    @classmethod
    def from_function(
        cls,
        func: Optional[Callable],
        name: str,  # We keep these required to support backwards compatibility
        description: str,
        return_direct: bool = False,
        args_schema: Optional[Type[BaseModel]] = None,
        coroutine: Optional[
            Callable[..., Awaitable[Any]]
        ] = None,  # This is last for compatibility, but should be after func
        **kwargs: Any,
    ) -> Tool:
        """Initialize tool from a function."""
        if func is None and coroutine is None:
            raise ValueError("Function and/or coroutine must be provided")
        return cls(
            name=name,
            func=func,
            coroutine=coroutine,
            description=description,
            return_direct=return_direct,
            args_schema=args_schema,
            **kwargs,
        )


class StructuredTool(BaseTool):