test_lc_agent_name_in_stream_metadata() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/test_agent_name.py lines 108–125

def test_lc_agent_name_in_stream_metadata() -> None:
    """Test that lc_agent_name is included in metadata when streaming with name."""
    tool_calls: list[list[ToolCall]] = [[]]
    agent = create_agent(
        model=FakeToolCallingModel(tool_calls=tool_calls),
        name="streaming_agent",
    )

    metadata_with_agent_name = []
    for _chunk, metadata in agent.stream(
        {"messages": [HumanMessage("Hello")]},
        stream_mode="messages",
    ):
        if "lc_agent_name" in metadata:
            metadata_with_agent_name.append(metadata["lc_agent_name"])

    assert len(metadata_with_agent_name) > 0
    assert all(name == "streaming_agent" for name in metadata_with_agent_name)