Unity MCP Pro — Plugin

Unity editor plugin that connects AI assistants (Claude, Cursor, Windsurf, VS Code Copilot) to the Unity editor via WebSocket.

280+ tools across 50 categories — scene management, GameObjects, scripts, prefabs, physics, lighting, animation, materials, terrain, particles, audio, UI, build pipeline, input simulation, screenshots, testing, 2D, timeline, splines, ECS, netcode, XR, and more.

Features

• Full Undo/Redo — Every AI operation goes through Unity's Undo system (Ctrl+Z)
• Production-grade WebSocket — Heartbeat, auto-reconnect with exponential backoff, port scanning (6605–6609)
• Smart Type Parsing — Automatic conversion of strings to Vector3, Color, Quaternion, etc.
• Domain Reload Safe — Survives script recompilation without losing connection state
• Server Setup Window — Built-in editor window for configuring MCP server and IDE integration
• Unity 2021.3+ — Supports Unity 2022, 2023, and Unity 6 (Built-in, URP, HDRP)

50 Tool Categories

Category	#	Category	#
Project	7	Animation	7
Scene	6	Animation Extended	5
GameObject	11	UI (Canvas)	6
Script	6	Audio	5
Editor	5	Particle	5
Prefab	6	Navigation	5
Material & Shader	6	Terrain	4
Physics	6	Build Pipeline	5
Lighting	5	Batch Operations	6
Analysis & Profiling	10	Package Manager	6
Input Simulation	8	Debug	5
Runtime Extended	7	Screenshot & Visual	4
Testing & QA	6	2D Tools	6
Controller	4	Timeline	5
Environment	6	Spline	5
Optimization	7	Shader Graph	5
Camera / Cinemachine	6	Visual Scripting	5
Post-Processing	5	Profiler	4
AI Tools	4	Benchmark	4
Game Systems	5	Playthrough	4
Import Settings	5	Watch / Monitor	3
Multi-Scene	4	Undo History	3
Scene View Camera	4	Addressables	5
Custom Editor	4	Localization	4
Rigging	4	ECS / DOTS	4
Netcode	4	XR / VR	4

Installation

Option 1: Unity Package Manager (Git URL)

1. Open Unity → Window → Package Manager
2. Click + → Add package from git URL...
3. Enter:

   https://github.com/youichi-uda/unity-mcp-pro-plugin.git
   

Option 2: Clone to your project

cd YourUnityProject/Packages
git clone https://github.com/youichi-uda/unity-mcp-pro-plugin.git com.unity-mcp-pro

Option 3: Download and copy

Download this repository and copy it into your project's Packages/com.unity-mcp-pro/ directory.

Setup

This plugin is the Unity-side component of Unity MCP Pro. To use it with AI assistants, you also need the MCP server.

1. Install this plugin (see above)
2. Get the MCP server — Available at unity-mcp.abyo.net
3. Build the MCP server:

   cd server && npm install && npm run build
   

4. Configure your AI client (or use the built-in Window → Unity MCP Pro → Server Setup):

   {
     "mcpServers": {
       "unity-mcp-pro": {
         "command": "node",
         "args": ["/path/to/server/build/index.js"]
       }
     }
   }
   

5. Open Unity — The plugin auto-connects when the editor starts. Check Window → Unity MCP Pro for connection status.

Architecture

AI Assistant  ←—stdio/MCP—→  Node.js MCP Server  ←—WebSocket—→  Unity Editor Plugin (this repo)

The plugin runs a WebSocket client inside the Unity editor that connects to the MCP server on 127.0.0.1:6605–6609. All tool calls are dispatched through the CommandRouter to domain-specific command handlers.

Multi-Editor Support

Run multiple Unity editors simultaneously on ports 6605-6609. Set the UNITY_MCP_PORT environment variable to target a specific instance.

Running Tests

1. Open Unity → Window → General → Test Runner
2. Select EditMode tab
3. Click Run All

Requirements

• Unity 2021.3 LTS or later
• Node.js 18+ (for the MCP server)
• Any MCP-compatible AI client

Links

• Website
• Unity Asset Store — AI Bridge for Unity (MCP Pro)
• MCP Server (itch.io)
• Discord

License

MIT License — see LICENSE