Logic Pro Server

AI-powered control for Apple Logic Pro via the Model Context Protocol.

An MCP server that lets AI assistants (Claude, etc.) control Logic Pro through AppleScript, macOS Accessibility API, and virtual MIDI.

Features

Category	Tools	Method
Transport	Play, Stop, Record, Tempo, Cycle, Metronome	AppleScript/Key Commands
Tracks	List, Create, Select, Rename, Delete, Mute, Solo	Accessibility + AppleScript
Plugins	List installed, Load, Read/Write parameters, Presets	auval + Accessibility API
MIDI	Send notes, Chords, CC, Patterns	Virtual MIDI Port (node-midi)
Project	Open, Save, Close, Bounce, Undo/Redo	AppleScript
Mixer	Show, Channel strip info, Load strip settings	Accessibility

35 tools total for comprehensive Logic Pro control.

Prerequisites

• macOS (Sonoma 14+ recommended)
• Node.js 18+
• Swift 5.9+ (included with Xcode/Command Line Tools)
• Logic Pro installed and running

Installation

# Clone and install
git clone <repo-url>
cd logic-pro-mcp
npm install

# Build TypeScript
npm run build

# Build Swift accessibility helper
npm run build:swift

macOS Setup

1. Grant Accessibility Access

System Settings → Privacy & Security → Accessibility

Add your terminal app (Terminal.app, iTerm2, or the Claude Desktop app) to the allowed list.

2. Logic Pro Settings

Open Logic Pro → Settings → Accessibility → Enable "Open plug-in windows in Controls view by default"

This exposes plugin parameters to the Accessibility API.

Claude Desktop Configuration

Add this to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "logic-pro": {
      "command": "node",
      "args": ["/absolute/path/to/logic-pro-mcp/dist/index.js"]
    }
  }
}

Usage Examples

Once connected, you can ask Claude things like:

• "List all tracks in my project"
• "Create a new software instrument track"
• "Load a Channel EQ on the selected track"
• "What are the compressor parameters on track 2?"
• "Set the tempo to 128 BPM"
• "Send a C major chord via MIDI"
• "Bounce my project"

Architecture

Claude AI ←→ MCP Server (stdio) ←→ Logic Pro
                  │
    ┌─────────────┼─────────────┐
    ▼             ▼             ▼
AppleScript   Accessibility   Virtual MIDI
(osascript)   (Swift Helper)  (node-midi)

Project Structure

logic-pro-mcp/
├── src/
│   ├── index.ts                  # MCP server entry
│   ├── bridges/
│   │   ├── applescript.ts        # osascript wrapper
│   │   ├── accessibility.ts      # Swift helper wrapper
│   │   └── midi-bridge.ts        # node-midi virtual port
│   └── tools/
│       ├── transport.ts          # Play, Stop, Record, Tempo
│       ├── tracks.ts             # Track management
│       ├── plugins.ts            # Plugin listing & control
│       ├── midi.ts               # MIDI note/CC sending
│       ├── project.ts            # Project management
│       └── mixer.ts              # Mixer controls
├── swift-helper/
│   ├── Package.swift
│   └── Sources/LogicAccessibility/
│       └── main.swift            # AXUIElement interaction
├── package.json
├── tsconfig.json
└── README.md

Limitations

• Logic Pro has no public API – this MCP uses system-level automation
• Some UI scripting operations are timing-sensitive (short delays are used)
• Plugin parameter access requires the Controls view to be enabled
• The Swift accessibility helper must be compiled before first use
• Accessibility permissions must be explicitly granted by the user

License

MIT