diff --git a/hermes_cli/commands.py b/hermes_cli/commands.py
index 87d73af58e..c606e88aec 100644
--- a/hermes_cli/commands.py
+++ b/hermes_cli/commands.py
@@ -862,6 +862,12 @@ class SlashCommandCompleter(Completer):
         except Exception:
             return {}
 
+    # Commands that open pickers when run without arguments.
+    # These should NOT receive a trailing space in completions because:
+    # - The TUI's submit handler applies completions on Enter if input differs
+    # - Adding space makes "/model" → "/model " which blocks picker execution
+    _PICKER_COMMANDS = frozenset({"model", "skin", "personality"})
+
     @staticmethod
     def _completion_text(cmd_name: str, word: str) -> str:
         """Return replacement text for a completion.
@@ -870,8 +876,17 @@ class SlashCommandCompleter(Completer):
         returning ``help`` would be a no-op and prompt_toolkit suppresses the
         menu. Appending a trailing space keeps the dropdown visible and makes
         backspacing retrigger it naturally.
+
+        However, commands that open pickers (model, skin, personality) should
+        NOT get a trailing space — the TUI would apply the completion on Enter
+        and block the picker from opening.
         """
-        return f"{cmd_name} " if cmd_name == word else cmd_name
+        if cmd_name != word:
+            return cmd_name
+        # Don't add space for picker commands — allows Enter to execute them
+        if cmd_name in SlashCommandCompleter._PICKER_COMMANDS:
+            return cmd_name
+        return f"{cmd_name} "
 
     @staticmethod
     def _extract_path_word(text: str) -> str | None: