diff --git a/pkg/command/operator.py b/pkg/command/operator.py
index a666f2c3..c5b0615b 100644
--- a/pkg/command/operator.py
+++ b/pkg/command/operator.py
@@ -20,6 +20,8 @@ def operator_class(
     parent_class: typing.Type[CommandOperator] = None
 ) -> typing.Callable[[typing.Type[CommandOperator]], typing.Type[CommandOperator]]:
     def decorator(cls: typing.Type[CommandOperator]) -> typing.Type[CommandOperator]:
+        assert issubclass(cls, CommandOperator)
+        
         cls.name = name
         cls.alias = alias
         cls.help = help