Flutter Documentation MCP server for AI agents

Flutter MCP provides real-time Flutter/Dart documentation and pub.dev package information to AI assistants, supporting over 50,000 packages on demand. This ensures your AI generates accurate, up-to-date Flutter code instead of hallucinated widgets or deprecated APIs.

Installation

Quick Start

Get the server running with npm:

# One-line usage (no installation required)
npx flutter-mcp

# Or install globally
npm install -g flutter-mcp
flutter-mcp

The server will automatically install dependencies and start running.

For MCP SuperAssistant Users: Use npx flutter-mcp --transport http --port 8000 to enable HTTP transport!

Requirements

Node.js 16+ (for npm/npx)
Python 3.10+ (auto-detected and used by the npm package)
No external dependencies (uses built-in SQLite caching)

Connecting to Your AI Assistant

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "flutter-docs": {
      "command": "npx",
      "args": ["flutter-mcp"]
    }
  }
}

Or if you installed globally:

{
  "mcpServers": {
    "flutter-docs": {
      "command": "flutter-mcp"
    }
  }
}

Restart Claude Desktop after saving.

Claude Code (claude.ai/code)

Create a .mcp.json file in your Flutter project root:

{
  "mcpServers": {
    "flutter-docs": {
      "command": "npx",
      "args": ["flutter-mcp"]
    }
  }
}

Then run Claude Code in your project directory:

cd your-flutter-project
claude

MCP SuperAssistant

MCP SuperAssistant requires HTTP transport:

Start the server with:

npx flutter-mcp --transport http --port 8000

In MCP SuperAssistant, add a new server:
- Name: Flutter MCP
- URL: http://localhost:8000
- Type: HTTP MCP Server

Using Flutter MCP

Flutter MCP provides two main tools for AI assistants:

Universal Search

"Search for Flutter animation widgets"
"Find state management packages" 
"Look for HTTP clients in pub.dev"

Smart Documentation Fetching

"Show me Container widget documentation"
"Get the docs for provider package"
"Explain dart:async Future class"

Version-Specific Documentation

Get documentation for specific package versions:

# Exact versions
"Show me provider:6.0.5 breaking changes"
"How does riverpod:2.5.1 AsyncNotifier work?"

# Version ranges
"Compare dio:^5.0.0 vs dio:^4.0.0"
"What's new in bloc:>=8.0.0?"

# Special keywords
"Try get:latest experimental features"
"Is provider:stable production ready?"

Available Tools

1. `flutter_search` - Universal Search

Search across Flutter/Dart documentation and pub.dev packages:

{
  "tool": "flutter_search",
  "arguments": {
    "query": "state management",
    "limit": 10  // Optional: max results (default: 10)
  }
}

2. `flutter_docs` - Smart Documentation Fetcher

Get documentation for any Flutter/Dart identifier:

{
  "tool": "flutter_docs",
  "arguments": {
    "identifier": "Container",              // Auto-detects as Flutter widget
    "topic": "examples",                    // Optional: filter content
    "max_tokens": 10000                     // Optional: limit response size
  }
}

Supports various formats:

"Container" - Flutter widget
"material.AppBar" - Library-qualified class
"provider" - pub.dev package
"dart:async.Future" - Dart core library

3. `flutter_status` - Health Check

Monitor service health and cache statistics:

{
  "tool": "flutter_status",
  "arguments": {}
}

Troubleshooting

Error: spawn flutter-mcp ENOENT

This means the system cannot find the flutter-mcp command. Solutions:

Use npx (recommended):

{
  "mcpServers": {
    "flutter-docs": {
      "command": "npx",
      "args": ["flutter-mcp"]
    }
  }
}

Install globally first:

npm install -g flutter-mcp

MCP server failed to start

Check if Node.js 16+ is installed: node --version
Try running manually to see errors: npx flutter-mcp
Check if Python 3.8+ is available: python3 --version
View detailed logs: DEBUG=true npx flutter-mcp

Cannot connect from MCP client

Different MCP clients require different transport protocols:

Claude Desktop: Uses STDIO transport (default)
- No port/URL needed
- Just use: npx flutter-mcp
MCP SuperAssistant: Requires HTTP transport
- Start with: npx flutter-mcp --transport http --port 8000
- Connect to: http://localhost:8000
Custom clients: May need SSE transport
- Start with: npx flutter-mcp --transport sse --port 8080
- SSE endpoint: http://localhost:8080/sse

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "flutter-mcp" '{"command":"flutter-mcp","args":["start"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "flutter-mcp": {
            "command": "flutter-mcp",
            "args": [
                "start"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json
Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "flutter-mcp": {
            "command": "flutter-mcp",
            "args": [
                "start"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect

Flutter Documentation MCP server