async def list_artifact_keys(
      self, *, app_name: str, user_id: str, session_id: str
  ) -> list[str]:
    """Lists all the artifact filenames within a session.

    Args:
        app_name: The name of the application.
        user_id: The ID of the user.
        session_id: The ID of the session.

    Returns:
        A list of all artifact filenames within a session.
    """
Lists all the artifact filenames within a session.

    Args:
        app_name: The name of the application.
        user_id: The ID of the user.
        session_id: The ID of the session.

    Returns:
        A list of all artifact filenames within a session.
    
src/google/adk/artifacts/base_artifact_service.py