docs: add Flutter Driver example to MCP server page

sites/docs/src/content/ai/mcp-server.md

@@ -392,6 +392,69 @@ is now a single request.
 
 [`package:fl_chart`]: {{site.pub-pkg}}/fl_chart
 
+### Interact with a running app
+
+You can use the Dart and Flutter MCP server to drive a running
+Flutter app from your AI assistant—take screenshots, tap buttons,
+enter text, scroll, and hot reload.
+
+First, add the `flutter_driver` package:
+
+```console
+$ flutter pub add "flutter_driver:{sdk: flutter}"
+```
+
+On mobile and desktop, gate `enableFlutterDriverExtension()` behind a
+`--dart-define` flag in your app's `main()` so it stays out of
+production builds:
+
+```dart
+import 'package:flutter_driver/driver_extension.dart';
+
+void main() {
+  if (const bool.fromEnvironment('ENABLE_FLUTTER_DRIVER')) {
+    enableFlutterDriverExtension();
+  }
+  runApp(const MyApp());
+}
+```
+
+Launch your app with the flag turned on:
+
+```console
+$ flutter run -d <device-id> --dart-define=ENABLE_FLUTTER_DRIVER=true
+```
+
+:::warning
+Enabling the Flutter Driver extension disables real keyboard input—typing
+is dropped and the on-screen keyboard might not appear. To type manually,
+use `enableFlutterDriverExtension(enableTextEntryEmulation: false)`, but
+then the agent's `enterText` command stops working.
+:::
+
+Then ask your assistant to connect:
+
+> Connect to my running Flutter app, take a screenshot, then tap "Sign In".
+
+The agent uses the `dtd` tool to discover the app and
+`flutter_driver_command` to drive its UI.
+
+:::note
+**Web**: the `flutter_driver` extension isn't supported on web builds, so
+finder-based commands like screenshots and taps aren't available there.
+Pair the Dart MCP server with a browser-driving MCP for those. Everything
+that flows through DTD—widget tree, runtime errors, and hot reload—still
+works in a normal `flutter run` web debug session. Prefer
+`flutter run -d web-server` so the browser the agent drives is the one DTD
+is connected to—with `-d chrome`, only the window Flutter spawned receives
+hot reload patches.
+
+See the [setup guide][flutter-driver-guide] for the web-safe conditional
+import, the `-d web-server` versus `-d chrome` modes, and common pitfalls.
+:::
+
+[flutter-driver-guide]: https://github.com/dart-lang/ai/blob/main/pkgs/dart_mcp_server/README.md#connect-to-a-running-flutter-app
+
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