test: narrow tool results to str before splitlines

The tools return str | list[dict] depending on output_format; the new
id-assertion tests called splitlines() without the isinstance narrowing
the sibling tests use, failing ty in CI.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Signed-off-by: Joe P <joe@basicmemory.com>

Author: 2 people

tests/mcp/test_tool_list_directory.py

@@ -234,6 +234,8 @@ async def test_list_directory_file_rows_include_external_id(client, test_graph,
 
     result = await list_directory(project=test_project.name, dir_name="/test")
 
+    assert isinstance(result, str)
+
     uuid_pattern = r"\| id: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}"
     file_lines = [line for line in result.splitlines() if line.startswith("📄")]
     assert file_lines, f"no file rows in: {result!r}"

tests/mcp/test_tool_recent_activity.py

@@ -624,6 +624,8 @@ async def test_recent_activity_entity_rows_include_external_id(client, test_grap
 
     result = await recent_activity(project=test_project.name, timeframe="30d")
 
+    assert isinstance(result, str)
+
     assert "Recent Notes & Documents" in result
     uuid_pattern = r"\[id: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\]"
     entity_lines = [line for line in result.splitlines() if line.strip().startswith("•")]