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Marionette MCP
Your agent's hands and eyes on a running Flutter app.
Marionette connects Claude Code, Cursor, Codex, Gemini CLI, Copilot or any MCP client to the Flutter app you run in debug mode. The agent sees the screen, taps, types, scrolls, reads the logs, hot reloads, and writes a report of what it did. If you know Playwright MCP: this is that, for Flutter.
Website · Docs · Video · Article
Quick start
- Add the package to your app and initialize the binding in debug builds:
bash
flutter pub add marionette_flutter
dart
void main() {
if (kDebugMode) {
MarionetteBinding.ensureInitialized();
} else {
WidgetsFlutterBinding.ensureInitialized();
}
runApp(const MyApp());
}
- Give your agent a bridge: the MCP server or the
marionetteCLI, whichever you prefer (every agent):
```bash # MCP server, registered with Claude Code dart pub global activate marionette_mcp claude mcp add --transport stdio marionette -- marionette_mcp
# or the CLI dart pub global activate marionette_cli ```
- Run the app with
flutter runand paste thews://…/wsVM service URI it prints into the prompt, or ask the agent to run the app itself:
Connect to ws://127.0.0.1:9101/…/ws. On Profile, a malformed email must show an error and keep Submit disabled, and a valid one must submit.
[!IMPORTANT] Flutter's own widgets work as is. A custom design system needs one configuration step, or the agent cannot see your buttons and fields: see Configure.
What the agent can do
| Tools | |
|---|---|
| See | get_interactive_elements, take_screenshots |
| Act | tap, enter_text, scroll_to, swipe, long_press, double_tap, pinch_zoom, press_key, press_back_button |
| Verify | get_logs, set_device_config (text scale, bold text, dark mode) |
| Iterate | hot_reload, hot_restart |
| Extend | your app's own actions, registered with registerMarionetteExtension |
With MarionetteConfiguration(enableSessionReports: true), every run leaves a folder: a steps.md the server writes, one line per tool call, and a report.md the agent writes from it. See Reports.
The marionette CLI drives the app with the same actions as shell commands: see Drive.
Agent Skills
marionette_flutter ships three Agent Skills:
| Skill | Teaches the agent to |
|---|---|
marionette-flutter-setup |
Add the binding, configure a custom design system, logs and device config |
marionette-flutter-drive-app |
Drive the app with the MCP tools or the CLI, and write the report |
marionette-flutter-to-patrol |
Turn a verified run into Patrol tests |
dart run skills@ get # in an app that depends on marionette_flutter
npx skills add leancodepl/marionette_mcp # without the Dart toolchain
Documentation
| Page | What is inside |
|---|---|
| Start | Setup, every agent's config, the first prompt, the example app, FAQ |
| Concepts | How the agent sees a screen, selectors, compaction, the single-binding rule |
| Configure | Custom design systems, Semantics, logs, device config, custom extensions |
| Drive | Prompts for common jobs, every tool with its CLI command, the CLI |
| Reports | Session folders, steps.md, report.md, the verdict |
Packages
| Package | Role |
|---|---|
marionette_flutter |
The binding in your app. Required. |
marionette_mcp |
The MCP server your agent runs. |
marionette_cli |
The marionette CLI, for shell-only agents. |
marionette_logging |
Log collection from the logging package. |
marionette_logger |
Log collection from the logger package. |
🛠️ Maintained by LeanCode
Marionette is built by LeanCode, the creators of Patrol, the testing framework for Flutter. We build Flutter products from scratch to long-term maintenance.
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