flutter-mcp-toolkit

Inspect and drive a running Flutter app from your AI assistant.

flutter-mcp-toolkit is a Dart MCP server + Flutter package that lets AI
assistants (Claude Code, Cursor, Codex, Cline) take (semantic snapshots, tap
widgets, type into forms, hot-reload, and read logs from a Flutter app) or create its own tools and resources at runtime using MCP Toolkit —
without leaving the conversation.

View Screenshots

Get started in 4 steps

# 1. Install the binary
curl -fsSL https://raw.githubusercontent.com/Arenukvern/mcp_flutter/main/install.sh | bash

# 2. Add the toolkit to your Flutter app
cd my-flutter-app
flutter-mcp-toolkit codegen-init   # adds flutter_mcp_toolkit + emits main.dart snippet

# 3. Install skills for your AI agent
flutter-mcp-toolkit init claude-code   # or: cursor | codex | cline | all

# 4. Run
flutter run --debug

That's it. Your AI agent can now inspect and drive the running app.

Documentation

Migrating v2 → v3 — fmt_* MCP tools, binaries, client config keys, validate-runtime.
Why this repo matters — what it is, why it exists.
CLI vs MCP — pick the right mode.
Feature map — the 27 tools.
AI agent setup — for non-Claude Code agents.
Architecture — for contributors.
Quick Start, Configuration, MCP RPC description

What it does

The toolkit exposes 27 MCP tools (under the fmt_* capability prefix) across four categories:

Inspection — semantic snapshot, view details, errors, screenshots, VM info
Interaction — tap, scroll, type, fill forms, hot-reload, navigate, wait_for
Debug — recent logs, evaluate Dart expressions
Lifecycle — discover apps, hot-reload, hot-restart

See the flutter-mcp-toolkit-{guide,inspect,control,debug} skills for the full
reference (installed by flutter-mcp-toolkit init).

Dynamic Tools Registration

Flutter apps can register custom tools and resources at runtime. See how it
works in this short YouTube video.
The same arguments.connection targeting is supported by the CLI's exec,
batch, daemon command/execute, daemon watch/start, and snapshot step args.

⚠️ Note on Dump RPCs

Dump RPC methods (like dump_render_tree) can produce huge token output and
are disabled by default. Enable with --dumps. See
mcp_server_dart README for the full flag surface.

🔒 Security

Generally, since you use MCP server to connect to Flutter app in Debug Mode, it should be safe to use. However, I still recommend to review how it works in ARCHITECTURE.md, how it can be modified to improve security if needed.

This MCP server is verified by MseeP.ai.

🔧 Troubleshooting

Connection Issues
- Ensure your Flutter app is running in debug mode
- Verify the port matches in both Flutter app and MCP server
- Check if the port is not being used by another process
- Safest explicit targeting: use arguments.connection.uri and paste exact Flutter machine app.debugPort.wsUri
- If response includes connection_selection_required, retry with arguments.connection.targetId using one URI from availableTargets (or set arguments.connection.uri directly)
AI Tool Not Detecting Inspector
- Restart the AI tool after configuration changes
- Verify the configuration JSON syntax
- Check the tool's logs for connection errors
Dynamic Tools Not Appearing
- Ensure flutter_mcp_toolkit package is properly initialized in your Flutter app
- Check that tools are registered using MCPToolkitBinding.instance.addEntries()
- Use fmt_list_client_tools_and_resources to verify registration
- Hot reload your Flutter app after adding new tools

The Flutter MCP Server is registered with Smithery's registry, making it discoverable and usable by other AI tools through a standardized interface.

Integration Architecture

┌─────────────────┐     ┌───────────────────────┐     ┌─────────────────┐
│                 │     │  Flutter App with     │     │                 │
│  Flutter App    │<--->│  flutter_mcp_toolkit  │<--->│ flutter-mcp-    │
│  (Debug Mode)   │     │  (VM Svc. Extensions  │     │ toolkit-server  │
│                 │     │  + Dynamic Tools)     │     │                 │
└─────────────────┘     └───────────────────────┘     └─────────────────┘

🤝 Contributing

Contributions are welcome! Please feel free to submit pull requests or report issues on the GitHub repository.

✨ Contributors

Huge thanks to all contributors for making this project better!

_{Henry Mao} 🚇	_Marwen 📖	_{Lawrence Sinclair} 📖 🛡️	_{Frank Fiegel} 🚇	_{Harish Anbalagan} 📓 🐛	_{Torben Keller} 📓 🐛	_Isfun 📓 🐛 🔬 💻
_{Cosy Studio} 📓 🐛 🔬	_{Luke Memet} 📓 🔬 🚧 ✅	_{Commentatk Media} 💻 🚧 📖	_{Umit Arslan} 💻 🚧	_{Joel Kitching} 💻 🚧	_{Jean-Luc Thumm} 🚧