AI Game Developer — Initial Setup

This guide walks through installing the unity-mcp-cli command-line tool and using it to set up a Unity project with AI Skills and MCP integration.

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Prerequisites

Install Node.js

unity-mcp-cli requires Node.js ^20.19.0 || >=22.12.0 (Node 21.x is not supported). If you don't have Node.js installed:

Use Homebrew:

brew install node@22

Or download the installer from https://nodejs.org/.

After installation, verify both node and npm are available:

node --version
npm --version

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Install unity-mcp-cli Globally

Install the CLI globally so the unity-mcp-cli command is available system-wide:

npm install -g unity-mcp-cli

Verify installation:

unity-mcp-cli --version

Permission errors? Use sudo npm install -g unity-mcp-cli or configure npm to use a directory you own:

npm config set prefix ~/.npm-global

Then add ~/.npm-global/bin to your PATH.

Alternative: Run any command without installing globally using npx:

npx unity-mcp-cli --help

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Quick Start — Full Project Setup

1. Install the Unity-MCP Plugin

Add the plugin to an existing Unity project:

unity-mcp-cli install-plugin /path/to/unity/project

2. Configure MCP Tools

Enable all tools, prompts, and resources:

unity-mcp-cli configure /path/to/unity/project \
  --enable-all-tools \
  --enable-all-prompts \
  --enable-all-resources

3. Set Up MCP for Your AI Agent

Configure MCP integration for your AI agent (e.g., Claude Code, Cursor, Copilot):

unity-mcp-cli setup-mcp claude-code /path/to/unity/project

List all supported agents:

unity-mcp-cli setup-mcp --list

4. Generate AI Skills

Generate skill files for your AI agent (requires Unity Editor to be running with the plugin):

unity-mcp-cli setup-skills claude-code /path/to/unity/project

5. Open Unity with MCP Connection

unity-mcp-cli open /path/to/unity/project

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Common Commands Reference

Command	Description
unity-mcp-cli install-plugin <path>	Install Unity-MCP plugin into a project
unity-mcp-cli remove-plugin <path>	Remove Unity-MCP plugin from a project
unity-mcp-cli configure <path> --list	List current MCP configuration
unity-mcp-cli setup-mcp <agent> <path>	Write MCP config for an AI agent
unity-mcp-cli setup-skills <agent> <path>	Generate skill files for an AI agent
unity-mcp-cli create-project <path>	Create a new Unity project
unity-mcp-cli install-unity <version>	Install a Unity Editor version
unity-mcp-cli open <path>	Open a Unity project in the Editor
unity-mcp-cli run-tool <tool> <path>	Execute an MCP tool via HTTP API

Add --verbose to any command for detailed diagnostic output.

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Troubleshooting

• npm not found: Node.js is not installed or not in your PATH. Reinstall Node.js and restart your terminal.
• Plugin not appearing in Unity: After install-plugin, open the project in Unity Editor. The package manager resolves dependencies on project open.
• Skills generation fails: Ensure Unity Editor is running with the MCP plugin installed and connected before running setup-skills.