test_bind_tools_tool_choice() — langchain Function Reference

Source Code

libs/partners/openai/tests/integration_tests/chat_models/test_base.py lines 594–608

def test_bind_tools_tool_choice(use_responses_api: bool) -> None:
    """Test passing in manually construct tool call message."""
    llm = ChatOpenAI(
        model="gpt-5-nano", temperature=0, use_responses_api=use_responses_api
    )
    for tool_choice in ("any", "required"):
        llm_with_tools = llm.bind_tools(
            tools=[GenerateUsername, MakeASandwich], tool_choice=tool_choice
        )
        msg = cast(AIMessage, llm_with_tools.invoke("how are you"))
        assert msg.tool_calls

    llm_with_tools = llm.bind_tools(tools=[GenerateUsername, MakeASandwich])
    msg = cast(AIMessage, llm_with_tools.invoke("how are you"))
    assert not msg.tool_calls