diff --git a/craft_cli/errors.py b/craft_cli/errors.py
index 102a328..fed1d7e 100644
--- a/craft_cli/errors.py
+++ b/craft_cli/errors.py
@@ -16,6 +16,10 @@
 
 """Error classes."""
 
+__all__ = [
+    "CraftError",
+]
+
 from typing import Optional
 
 
diff --git a/craft_cli/messages.py b/craft_cli/messages.py
index 3b37acd..8307a81 100644
--- a/craft_cli/messages.py
+++ b/craft_cli/messages.py
@@ -16,6 +16,12 @@
 
 """Support for all messages, ok or after errors, to screen and log file."""
 
+__all__ = [
+    "EmitterMode",
+    "TESTMODE",
+    "emit",
+]
+
 import enum
 import itertools
 import logging