Unity MCP 🔌 MCP server Free

What it does

Unity MCP is an MCP server, companion CLI and Unity plugin that let AI coding agents drive the Unity Editor and runtime directly: creating GameObjects, editing scenes and materials, running tests, capturing screenshots, and calling arbitrary C# methods you expose with a single [AiTool] attribute, instead of only reading and writing script files on disk.

Tools it gives your agent

70+ built-in tools across four categories:

• Project & Assets (21 tools): asset management, prefab operations, shader inspection, package management
• Scene & Hierarchy (25 tools): GameObject manipulation, scene navigation, component control, screenshot capture
• Scripting & Editor (19 tools): Roslyn-based code execution, reflection-based method discovery, test automation, console logging
• Profiling & Diagnostics (12 tools): performance monitoring, memory statistics, rendering analysis, frame capture

Architecture is three-layer: an MCP client (Claude Code, Cursor, etc.), an MCP server bridging client and Unity over stdio or streamableHttp, and a Unity plugin that executes the tools inside the editor or a compiled build. Runtime support means it also works inside running games for live NPC behavior and debugging, not just editor-time edits.

Works with

Claude Code, Claude Desktop, GitHub Copilot, Cursor, Windsurf, Gemini, VS Code, Rider and any other MCP-capable client. Editor support spans Windows, macOS and Linux (x64/arm64); runtime works in compiled games on the same platforms.

How to install

npm install -g unity-mcp-cli
unity-mcp-cli install-plugin ./MyUnityProject
unity-mcp-cli login
unity-mcp-cli open ./MyUnityProject

Then open Window/AI Game Developer in Unity and click "Auto-generate Skills" or configure the MCP connection manually. A .unitypackage download and an OpenUPM package (openupm add com.ivanmurzak.unity.mcp) are also provided for manual installs.

Maintenance and safety

Apache-2.0 licensed and actively developed (4.3k+ stars, 386 forks, 3,100+ commits, commits within days of review), with a Discord community and Docker support for remote/cloud deployment. Free to use, with no paid tier documented, and works with any LLM provider so there is no vendor lock-in.

Who should use it

Unity developers who want their coding agent to act directly on the Editor and the running game — creating and wiring up objects, running tests, calling gameplay code at runtime, exposing custom C# methods as tools — instead of being limited to editing files and waiting for a manual rebuild to see the result.