Fix more ruff issues

tests/test_registry_critical.py

@@ -187,17 +187,14 @@ class TestToolRegistry:
         for expected in expected_tools:
             assert expected in tools, f"Expected tool {expected} not registered"
 
-    def test_tool_functions_return_dict(self):
-        """Verify all tool functions return dictionaries."""
+    def test_tool_functions_are_valid(self):
+        """Verify all tool functions are properly structured."""
         tools = make_tools()
 
-        # Test with minimal valid arguments
-        # Note: This is a smoke test, not full integration
+        # Verify structure without calling functions
+        # (calling would require full setup with memory, clients, etc.)
         for name, tool in tools.items():
-            sig = inspect.signature(tool.func)
-            # We can't call all tools without proper setup,
-            # but we can verify they're structured correctly
-            assert callable(tool.func)
+            assert callable(tool.func), f"Tool {name} function is not callable"
 
 
 class TestToolDataclass: