diff --git a/tests/test_tools_notes.py b/tests/test_tools_notes.py
index 7512d39..5298b09 100644
--- a/tests/test_tools_notes.py
+++ b/tests/test_tools_notes.py
@@ -64,7 +64,11 @@ async def test_create_note_tool_preserves_body_for_knowledge_notes():
 
     async def fake_create_note(**kwargs):
         captured.update(kwargs)
-        return SimpleNamespace(id=1, title=kwargs["title"], status=None)
+        # Knowledge-note return path reads note.project_id; SimpleNamespace
+        # needs the attribute even when it's None.
+        return SimpleNamespace(
+            id=1, title=kwargs["title"], status=None, project_id=None,
+        )
 
     with patch(
         "fabledassistant.services.tools.notes.create_note", new=fake_create_note,