diff --git a/command.py b/command.py
index 516c2d9..c3cad5e 100644
--- a/command.py
+++ b/command.py
@@ -114,3 +114,8 @@
   """Command which defaults to output in a pager, as its
      display tends to be larger than one screen full.
   """
+
+class MirrorSafeCommand(object):
+  """Command permits itself to run within a mirror,
+     and does not require a working directory.
+  """