test_get_buffer_string_xml_server_tool_call_args_truncation() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/messages/test_utils.py lines 2595–2613

def test_get_buffer_string_xml_server_tool_call_args_truncation() -> None:
    """Test that server_tool_call args are truncated to 500 chars."""
    long_value = "y" * 600
    messages: list[BaseMessage] = [
        AIMessage(
            content=[
                {
                    "type": "server_tool_call",
                    "id": "call_1",
                    "name": "test_tool",
                    "args": {"data": long_value},
                },
            ]
        ),
    ]
    result = get_buffer_string(messages, format="xml")
    assert "..." in result
    # The full 600-char value should not appear
    assert long_value not in result