LogEntry Class — langchain Architecture

Source Code

libs/core/langchain_core/tracers/log_stream.py lines 40–80

class LogEntry(TypedDict):
    """A single entry in the run log."""

    id: str
    """ID of the sub-run."""

    name: str
    """Name of the object being run."""

    type: str
    """Type of the object being run, eg. prompt, chain, llm, etc."""

    tags: list[str]
    """List of tags for the run."""

    metadata: dict[str, Any]
    """Key-value pairs of metadata for the run."""

    start_time: str
    """ISO-8601 timestamp of when the run started."""

    streamed_output_str: list[str]
    """List of LLM tokens streamed by this run, if applicable."""

    streamed_output: list[Any]
    """List of output chunks streamed by this run, if available."""

    inputs: NotRequired[Any | None]
    """Inputs to this run. Not available currently via `astream_log`."""

    final_output: Any | None
    """Final output of this run.

    Only available after the run has finished successfully.
    """

    end_time: str | None
    """ISO-8601 timestamp of when the run ended.

    Only available after the run has finished.
    """