diff --git a/src/python/jw/pkg/CmdBase.py b/src/python/jw/pkg/CmdBase.py
new file mode 100644
index 00000000..65a517b5
--- /dev/null
+++ b/src/python/jw/pkg/CmdBase.py
@@ -0,0 +1,13 @@
+from .App import App
+from .lib.Cmd import Cmd as Base
+
+class CmdBase(Base):
+
+    @property
+    def app(self) -> App:
+        ret = super().app
+        if not isinstance(ret, App):
+            raise TypeError(
+                f'Expected {self.__class__.__name__}, got {type(ret).__name__}'
+            )
+        return ret
diff --git a/src/python/jw/pkg/cmds/projects/Cmd.py b/src/python/jw/pkg/cmds/projects/Cmd.py
new file mode 100644
index 00000000..2b3799ba
--- /dev/null
+++ b/src/python/jw/pkg/cmds/projects/Cmd.py
@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from argparse import ArgumentParser
+
+from ...CmdBase import CmdBase
+from ..CmdProjects import CmdProjects as Parent
+
+class Cmd(CmdBase):  # export
+
+    def __init__(self, parent: Parent, name: str, help: str) -> None:
+        super().__init__(parent, name, help)
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)