test_tool_node_not_accepted() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py lines 363–378

def test_tool_node_not_accepted() -> None:
    """Test that passing a ToolNode instance to create_agent raises an error."""

    @tool
    def some_tool(value: str) -> str:
        """Some tool."""
        return "result"

    tool_node = ToolNode([some_tool])

    with pytest.raises(TypeError, match="'ToolNode' object is not iterable"):
        create_agent(
            model=FakeToolCallingModel(),
            tools=tool_node,  # type: ignore[arg-type]
            system_prompt="You are a helpful assistant.",
        )