InvalidToolCall Class — langchain Architecture

Source Code

libs/core/langchain_core/messages/content.py lines 336–369

class InvalidToolCall(TypedDict):
    """Allowance for errors made by LLM.

    Here we add an `error` key to surface errors made during generation
    (e.g., invalid JSON arguments.)
    """

    # TODO: Consider making fields NotRequired[str] in the future.

    type: Literal["invalid_tool_call"]
    """Used for discrimination."""

    id: str | None
    """An identifier associated with the tool call.

    An identifier is needed to associate a tool call request with a tool
    call result in events when multiple concurrent tool calls are made.
    """
    # TODO: Consider making this NotRequired[str] in the future.

    name: str | None
    """The name of the tool to be called."""

    args: str | None
    """The arguments to the tool call."""

    error: str | None
    """An error message associated with the tool call."""

    index: NotRequired[int | str]
    """Index of block in aggregate response. Used during streaming."""

    extras: NotRequired[dict[str, Any]]
    """Provider-specific metadata."""