diff --git a/aider/commands.py b/aider/commands.py
index 69bd4c7db..81713c7e1 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -49,12 +49,13 @@ class Commands:
 
         ef = args.strip()
         valid_formats = [coder.edit_format for coder in coders.__all__ if getattr(coder, 'edit_format', None)]
-        dump(valid_formats)
-
+        
+        self.io.tool_output("Valid edit formats:")
+        for format in valid_formats:
+            self.io.tool_output(f"• {format}")
+        
         if ef not in valid_formats:
-            self.io.tool_error(
-                f"Edit format \"{ef}\" should be one of: {', '.join(valid_formats)}"
-            )
+            self.io.tool_error(f"Edit format \"{ef}\" is not valid.")
             return
 
         raise SwitchCoder(edit_format=ef)