InjectedToolCallId

Annotation for injecting the tool call ID.

This annotation is used to mark a tool parameter that should receive the tool call ID at runtime.

from typing import Annotated
from langchain_core.messages import ToolMessage
from langchain_core.tools import tool, InjectedToolCallId

@tool
def foo(
    x: int, tool_call_id: Annotated[str, InjectedToolCallId]
) -> ToolMessage:
    """Return x."""
    return ToolMessage(
        str(x),
        artifact=x,
        name="foo",
        tool_call_id=tool_call_id
    )