print help if there are no sub-commands given

src/kumacli/cmd/maintenance.py

@@ -209,6 +209,8 @@ def setup_maintenance_parser(subparsers):
     maintenance_parser = subparsers.add_parser(
         "maintenance", help="Maintenance operations"
     )
+    # Store reference to parser for help display
+    setup_maintenance_parser._parser = maintenance_parser
     maintenance_subparsers = maintenance_parser.add_subparsers(
         dest="maintenance_action", help="Maintenance actions"
     )
@@ -263,7 +265,15 @@ def handle_maintenance_command(args, client):
     """Handle maintenance command execution"""
     maintenance_commands = MaintenanceCommands(client)
 
-    if args.maintenance_action == "list":
+    if not args.maintenance_action:
+        if hasattr(setup_maintenance_parser, "_parser"):
+            setup_maintenance_parser._parser.print_help()
+        else:
+            print(
+                "Error: No maintenance action specified. Use --help for usage information."
+            )
+        return False
+    elif args.maintenance_action == "list":
         maintenance_commands.list_maintenances()
     elif args.maintenance_action == "add":
         title = (

src/kumacli/cmd/monitor.py

@@ -218,6 +218,8 @@ class MonitorCommands:
 def setup_monitor_parser(subparsers):
     """Setup monitor command parser"""
     monitor_parser = subparsers.add_parser("monitor", help="Monitor operations")
+    # Store reference to parser for help display
+    setup_monitor_parser._parser = monitor_parser
     monitor_subparsers = monitor_parser.add_subparsers(
         dest="monitor_action", help="Monitor actions"
     )
@@ -277,7 +279,15 @@ def handle_monitor_command(args, client):
     """Handle monitor command execution"""
     monitor_commands = MonitorCommands(client)
 
-    if args.monitor_action == "list":
+    if not args.monitor_action:
+        if hasattr(setup_monitor_parser, "_parser"):
+            setup_monitor_parser._parser.print_help()
+        else:
+            print(
+                "Error: No monitor action specified. Use --help for usage information."
+            )
+        return False
+    elif args.monitor_action == "list":
         monitor_commands.list_monitors(
             monitor_patterns=args.monitor, group_patterns=args.group
         )