Unity MCP 🔌 MCP server Open source

What it does

MCP for Unity connects an AI coding agent to a running Unity Editor. It has two parts: a C# package that you add to your Unity project, and a Python server that your MCP client talks to. With both running, the agent can create and change scenes and GameObjects, write and edit C# scripts, manage assets, prefabs and materials, read the console, run tests, profile and start player builds. It is MIT-licensed, maintained by Aura, not affiliated with Unity Technologies, and supports Unity 2021.3 LTS through Unity 6.

Tools it gives your agent

• Core (on by default): scene, GameObject, component, prefab, material, asset and package management; C# script creation, structured edits and validation; menu items, console reading, asset refresh and batch execution
• Builds and editor: manage_build for player builds and platform switching, plus editor state and settings control
• Docs: unity_docs for the official Unity documentation and unity_reflect for inspecting the live C# API
• Optional groups: animation, ProBuilder modelling, profiling, and AI asset generation for images, audio and 3D models

Works with

This is a local server. By default it runs over HTTP at localhost:8080, and stdio is also available for clients that only speak stdio, such as Claude Desktop. The docs list Claude Code, Claude Desktop, Cursor, VS Code and GitHub Copilot, Windsurf, Cline, Gemini CLI, Codex and Antigravity, and any MCP client should work. A setup window in Unity writes client configs for you, and a remote multi-user mode with API keys is documented.

How to connect

In Unity's Package Manager, add the package from its git URL (or use OpenUPM), then open Window → MCP for Unity and configure your detected clients. For manual stdio setup:

https://github.com/CoplayDev/unity-mcp.git?path=/MCPForUnity#main
openupm add com.coplaydev.unity-mcp
uvx --from mcpforunityserver mcp-for-unity --transport stdio

Cost and limits

The package and server are free. You need Python 3.10+ with uv. The asset generation tools use your own keys for fal.ai, OpenRouter, Tripo or Meshy, and those services charge you directly.

Safety notes

The agent can delete scripts and assets and run menu items, so use version control on the project. Turn off tool groups you don't need. If you use the remote-hosted mode, keep API-key validation turned on.