fix(cli): restore /model command handler

cli.py

@@ -3759,6 +3759,91 @@ def process_command(self, command: str) -> bool:
             self._handle_resume_command(cmd_original)
         elif canonical == "provider":
             self._show_model_and_providers()
+        elif canonical == "model":
+            # Use original case so model names like "Anthropic/Claude-Opus-4" are preserved
+            parts = cmd_original.split(maxsplit=1)
+            if len(parts) > 1:
+                from hermes_cli.model_switch import switch_model, switch_to_custom_provider
+
+                raw_input = parts[1].strip()
+
+                # Handle bare "/model custom" — switch to custom provider
+                # and auto-detect the model from the endpoint.
+                if raw_input.strip().lower() == "custom":
+                    result = switch_to_custom_provider()
+                    if result.success:
+                        self.model = result.model
+                        self.requested_provider = "custom"
+                        self.provider = "custom"
+                        self.api_key = result.api_key
+                        self.base_url = result.base_url
+                        self.agent = None
+                        save_config_value("model.default", result.model)
+                        save_config_value("model.provider", "custom")
+                        save_config_value("model.base_url", result.base_url)
+                        print(f"(^_^)b Model changed to: {result.model} [provider: Custom]")
+                        print(f"  Endpoint: {result.base_url}")
+                        print(f"  Status: connected (model auto-detected)")
+                    else:
+                        print(f"(>_<) {result.error_message}")
+                    return True
+
+                # Core model-switching pipeline (shared with gateway)
+                current_provider = self.provider or self.requested_provider or "openrouter"
+                result = switch_model(
+                    raw_input,
+                    current_provider,
+                    current_base_url=self.base_url or "",
+                    current_api_key=self.api_key or "",
+                )
+
+                if not result.success:
+                    print(f"(>_<) {result.error_message}")
+                    if "Did you mean" not in result.error_message:
+                        print(f"  Model unchanged: {self.model}")
+                        if "credentials" not in result.error_message.lower():
+                            print("  Tip: Use /model to see available models, /provider to see providers")
+                else:
+                    self.model = result.new_model
+                    self.agent = None  # Force re-init
+
+                    if result.provider_changed:
+                        self.requested_provider = result.target_provider
+                        self.provider = result.target_provider
+                        self.api_key = result.api_key
+                        self.base_url = result.base_url
+
+                    provider_note = f" [provider: {result.provider_label}]" if result.provider_changed else ""
+
+                    if result.persist:
+                        saved_model = save_config_value("model.default", result.new_model)
+                        if result.provider_changed:
+                            save_config_value("model.provider", result.target_provider)
+                            # Persist base_url for custom endpoints; clear
+                            # when switching away from custom (#2562 Phase 2).
+                            if result.base_url and "openrouter.ai" not in (result.base_url or ""):
+                                save_config_value("model.base_url", result.base_url)
+                            else:
+                                save_config_value("model.base_url", None)
+                        if saved_model:
+                            print(f"(^_^)b Model changed to: {result.new_model}{provider_note} (saved to config)")
+                        else:
+                            print(f"(^_^) Model changed to: {result.new_model}{provider_note} (this session only)")
+                    else:
+                        print(f"(^_^) Model changed to: {result.new_model}{provider_note} (this session only)")
+                        if result.warning_message:
+                            print(f"  Reason: {result.warning_message}")
+                        print("  Note: Model will revert on restart. Use a verified model to save to config.")
+
+                    # Show endpoint info for custom providers
+                    if result.is_custom_target:
+                        endpoint = result.base_url or self.base_url or "custom endpoint"
+                        print(f"  Endpoint: {endpoint}")
+                        if not result.provider_changed:
+                            print(f"  Tip: To switch providers, use /model provider:model")
+                            print(f"       e.g. /model openai-codex:gpt-5.2-codex")
+            else:
+                self._show_model_and_providers()
         elif canonical == "prompt":
             # Use original case so prompt text isn't lowercased
             self._handle_prompt_command(cmd_original)

hermes_cli/commands.py

@@ -81,6 +81,8 @@ class CommandDef:
                cli_only=True),
     CommandDef("provider", "Show available providers and current provider",
                "Configuration"),
+    CommandDef("model", "Show or switch the active model", "Configuration",
+               args_hint="[provider:model]"),
     CommandDef("prompt", "View/set custom system prompt", "Configuration",
                cli_only=True, args_hint="[text]", subcommands=("clear",)),
     CommandDef("personality", "Set a predefined personality", "Configuration",