The test `test_tool_without_description_omits_tool_description` asserts that `SPANDATA.GEN_AI_TOOL_DESCRIPTION in tool_span['data']` is True and its value is None. However, the PR description explicitly states: 'If no description is available (e.g. the tool has no docstring), the attribute is omitted from the span entirely.' The test docstring also says 'omits tool description' but the assertions verify the opposite - that it IS present with a None value.

The test `test_tool_without_description_omits_tool_description` (line 2871-2872) asserts that when a tool has no docstring, `SPANDATA.GEN_AI_TOOL_DESCRIPTION` should be present in the span data with value `None`. However, the PR description explicitly states: 'If no description is available (e.g. the tool has no docstring), the attribute is omitted from the span entirely.' The implementation in `execute_tool.py` line 41-42 only checks `if tool_definition:` before setting the description, so it will set `None` when the tool exists but has no docstring. The test should either assert the attribute is NOT present (matching PR intent), or the implementation needs to check `if tool_definition and tool_definition.description:`.