_create_function_message() — langchain Function Reference

Source Code

libs/langchain/langchain_classic/agents/format_scratchpad/openai_functions.py lines 36–65

def _create_function_message(
    agent_action: AgentAction,
    observation: Any,
) -> FunctionMessage:
    """Convert agent action and observation into a function message.

    Args:
        agent_action: the tool invocation request from the agent.
        observation: the result of the tool invocation.

    Returns:
        FunctionMessage that corresponds to the original tool invocation.

    Raises:
        ValueError: if the observation cannot be converted to a string.
    """
    if not isinstance(observation, str):
        try:
            content = json.dumps(observation, ensure_ascii=False)
        except TypeError:
            content = str(observation)
        except Exception:
            _logger.exception("Unexpected error converting observation to string.")
            content = str(observation)
    else:
        content = observation
    return FunctionMessage(
        name=agent_action.tool,
        content=content,
    )