feat: add experimental useAgentProtocol flag

packages/cli/src/config/config.ts

@@ -978,6 +978,7 @@ export async function loadCliConfig(
     modelSteering: settings.experimental?.modelSteering,
     topicUpdateNarration: settings.experimental?.topicUpdateNarration,
     toolOutputMasking: settings.experimental?.toolOutputMasking,
+    useAgentProtocol: settings.experimental?.useAgentProtocol,
     noBrowser: !!process.env['NO_BROWSER'],
     summarizeToolOutput: settings.model?.summarizeToolOutput,
     ideMode,

packages/cli/src/config/settingsSchema.ts

@@ -2080,6 +2080,16 @@ const SETTINGS_SCHEMA = {
           'Enable dynamic model configuration (definitions, resolutions, and chains) via settings.',
         showInDialog: false,
       },
+      useAgentProtocol: {
+        type: 'boolean',
+        label: 'Use Agent Protocol',
+        category: 'Experimental',
+        requiresRestart: true,
+        default: false,
+        description:
+          'Enable the experimental unified agent for interactive mode.',
+        showInDialog: false,
+      },
       gemmaModelRouter: {
         type: 'object',
         label: 'Gemma Model Router',