_DirectlyInjectedToolArg Class — langchain Architecture

Source Code

libs/core/langchain_core/tools/base.py lines 1374–1393

class _DirectlyInjectedToolArg:
    """Annotation for tool arguments that are injected at runtime.

    Injected via direct type annotation, rather than annotated metadata.

    For example, `ToolRuntime` is a directly injected argument.

    Note the direct annotation rather than the verbose alternative:
    `Annotated[ToolRuntime, InjectedRuntime]`

    ```python
    from langchain_core.tools import tool, ToolRuntime


    @tool
    def foo(x: int, runtime: ToolRuntime) -> str:
        # use runtime.state, runtime.context, runtime.store, etc.
        ...
    ```
    """