diff --git a/llama_stack/cli/model/model.py b/llama_stack/cli/model/model.py
index f59ba8376..02e7f216f 100644
--- a/llama_stack/cli/model/model.py
+++ b/llama_stack/cli/model/model.py
@@ -26,6 +26,8 @@ class ModelParser(Subcommand):
             description="Work with llama models",
         )
 
+        self.parser.set_defaults(func=lambda args: self.parser.print_help())
+
         subparsers = self.parser.add_subparsers(title="model_subcommands")
 
         # Add sub-commands
diff --git a/llama_stack/cli/stack/stack.py b/llama_stack/cli/stack/stack.py
index 8650bd728..10e49f8c9 100644
--- a/llama_stack/cli/stack/stack.py
+++ b/llama_stack/cli/stack/stack.py
@@ -31,6 +31,8 @@ class StackParser(Subcommand):
             version=f"{version('llama-stack')}",
         )
 
+        self.parser.set_defaults(func=lambda args: self.parser.print_help())
+
         subparsers = self.parser.add_subparsers(title="stack_subcommands")
 
         # Add sub-commands