test_tool_call_id_empty_string_passed_to_callback() — langchain Function Reference

Architecture documentation for the test_tool_call_id_empty_string_passed_to_callback() function in test_tools.py from the langchain codebase.

Function python LangChainCore MessageInterface

Entity Profile

LangChainCore→ MessageInterface→ test_tool_call_id_empty_string_passed_to_callback() — langchain Function Reference

Dependency Diagram

graph TD
  8d9ec39a_e936_276d_b056_ca07c244ccaf["test_tool_call_id_empty_string_passed_to_callback()"]
  8e7836ae_e72c_f670_72a5_4ca6d46e3555["test_tools.py"]
  8d9ec39a_e936_276d_b056_ca07c244ccaf -->|defined in| 8e7836ae_e72c_f670_72a5_4ca6d46e3555
  style 8d9ec39a_e936_276d_b056_ca07c244ccaf fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/test_tools.py lines 3428–3462

def test_tool_call_id_empty_string_passed_to_callback() -> None:
    """Test that empty string `tool_call_id` is correctly passed to callback.

    Some systems may use empty strings as `tool_call_id`, and this should
    be passed through correctly (not converted to `None`).
    """

    @tool
    def simple_tool(query: str) -> str:
        """Simple tool for testing.

        Args:
            query: The query string.
        """
        return f"Result: {query}"

    handler = CallbackHandlerWithToolCallIdCapture(captured_tool_call_ids=[])

    # Invoke tool with empty string tool_call_id
    tool_call: ToolCall = {
        "name": "simple_tool",
        "args": {"query": "test"},
        "id": "",
        "type": "tool_call",
    }

    result = simple_tool.invoke(tool_call, config={"callbacks": [handler]})

    assert result == ToolMessage(
        content="Result: test", name="simple_tool", tool_call_id=""
    )
    assert handler.tool_starts == 1
    assert len(handler.captured_tool_call_ids) == 1
    # Empty string should be passed as-is, not converted to None
    assert handler.captured_tool_call_ids[0] == ""