Justin P Barnett
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README.md
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README.md
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# Unity MCP Package
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# Unity MCP ✨
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A Unity package that enables seamless communication between Unity and Large Language Models (LLMs) like Claude Desktop via the **Model Context Protocol (MCP)**. This server acts as a bridge, allowing Unity to send commands to and receive responses from MCP-compliant tools, empowering developers to automate workflows, manipulate assets, and control the Unity Editor programmatically.
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**Connect your Unity Editor to LLMs using the Model Context Protocol.**
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Welcome to the initial release of this open-source project! Whether you're looking to integrate LLMs into your Unity workflow or contribute to an exciting new tool, I appreciate you taking the time to check it out!
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Unity MCP acts as a bridge, allowing AI assistants (like Claude, Cursor) to interact directly with your Unity Editor via a local **MCP (Model Context Protocol) Client**. Give your LLM tools to manage assets, control scenes, edit scripts, and automate tasks within Unity.
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## Overview
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---
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The Unity MCP Server provides a bidirectional communication channel between Unity (via C#) and a Python server, enabling:
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## <picture><source media="(prefers-color-scheme: dark)" srcset="https://github.com/justinpbarnett/unity-mcp/assets/11047284/c279675a-dd58-406b-9613-5b16b5c6bb63"><source media="(prefers-color-scheme: light)" srcset="https://github.com/justinpbarnett/unity-mcp/assets/11047284/b54f891d-961b-4048-a9c4-3af46e2a52fc"><img alt="UnityMCP Workflow" width="100%" style="max-width: 600px; display: block; margin-left: auto; margin-right: auto;"></picture>
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- **Asset Management**: Create, import, and manipulate Unity assets programmatically.
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- **Scene Control**: Manage scenes, objects, and their properties.
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- **Material Editing**: Modify materials and their properties.
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- **Script Integration**: View, create, and update Unity scripts.
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- **Editor Automation**: Control Unity Editor functions like undo, redo, play, and build.
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## Key Features 🚀
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This project is perfect for developers who want to leverage LLMs to enhance their Unity projects or automate repetitive tasks.
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* **🗣️ Natural Language Control:** Instruct your LLM to perform Unity tasks.
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* **🛠️ Powerful Tools:** Manage assets, scenes, materials, scripts, and editor functions.
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* **🤖 Automation:** Automate repetitive Unity workflows.
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* **🧩 Extensible:** Designed to work with various MCP Clients.
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## Installation
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<details>
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<summary><strong>Expand for Available Tools...</strong></summary>
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To use the Unity MCP Package, ensure you have the following installed:
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Your LLM can use functions like:
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- **Unity 2020.3 LTS or newer** (⚠️ Currently only works in URP projects)
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- **Python 3.12 or newer**
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- **uv package manager**
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* `read_console`: Gets messages from or clears the console.
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* `manage_script`: Manages C# scripts (create, read, update, delete).
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* `manage_editor`: Controls and queries the editor's state and settings.
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* `manage_scene`: Manages scenes (load, save, create, get hierarchy, etc.).
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* `manage_asset`: Performs asset operations (import, create, modify, delete, etc.).
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* `manage_gameobject`: Manages GameObjects: create, modify, delete, find, and component operations.
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* `execute_menu_item`: Executes a menu item via its path (e.g., "File/Save Project").
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</details>
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### Step 1: Install Python
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---
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Download and install Python 3.12 or newer from [python.org](https://www.python.org/downloads/). Make sure to add Python to your system’s PATH during installation.
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## How It Works 🤔
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### Step 2: Install uv
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Unity MCP connects your tools using two components:
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uv is a Python package manager that simplifies dependency management. Install it using the command below based on your operating system:
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1. **Unity MCP Bridge:** A Unity package running inside the Editor. (Installed via Package Manager).
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2. **Unity MCP Server:** A Python server that runs locally, communicating between the Unity Bridge and your MCP Client. (Installed manually).
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- **Mac**:
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**Flow:** `[Your LLM via MCP Client] <-> [Unity MCP Server (Python)] <-> [Unity MCP Bridge (Unity Editor)]`
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---
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## Installation ⚙️
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> **Note:** The setup is constantly improving as we update the package. Check back if you randomly start to run into issues.
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### Prerequisites
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<details>
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<summary><strong>Click to view required software...</strong></summary>
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* **Git CLI:** For cloning the server code. [Download Git](https://git-scm.com/downloads)
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* **Python:** Version 3.12 or newer. [Download Python](https://www.python.org/downloads/)
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* **Unity Hub & Editor:** Version 2020.3 LTS or newer. [Download Unity](https://unity.com/download)
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* **uv (Python package manager):**
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```bash
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brew install uv
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pip install uv
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# Or see: https://docs.astral.sh/uv/getting-started/installation/
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```
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* **An MCP Client:**
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* [Claude Desktop](https://claude.ai/download)
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* [Cursor](https://www.cursor.com/en/downloads)
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* *(Others may work with manual config)*
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</details>
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### Step 1: Install the Unity Package (Bridge)
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1. Open your Unity project.
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2. Go to `Window > Package Manager`.
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3. Click `+` -> `Add package from git URL...`.
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4. Enter:
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```
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https://github.com/justinpbarnett/unity-mcp.git?path=/UnityMcpBridge
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```
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5. Click `Add`.
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6. The MCP Server should automatically be installed onto your machine as a result of this process.
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### Step 2: Configure Your MCP Client
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Connect your MCP Client (Claude, Cursor, etc.) to the Python server you installed in Step 1.
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**Option A: Auto-Configure (Recommended for Claude/Cursor)**
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1. In Unity, go to `Window > Unity MCP`.
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2. Click `Auto Configure Claude` or `Auto Configure Cursor`.
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3. Look for a green status indicator 🟢 and "Connected". *(This attempts to modify the MCP Client's config file automatically)*.
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**Option B: Manual Configuration**
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If Auto-Configure fails or you use a different client:
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1. **Find your MCP Client's configuration file.** (Check client documentation).
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* *Claude Example (macOS):* `~/Library/Application Support/Claude/claude_desktop_config.json`
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* *Claude Example (Windows):* `%APPDATA%\Claude\claude_desktop_config.json`
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2. **Edit the file** to add/update the `mcpServers` section, using the *exact* paths from Step 1.
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<details>
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<summary><strong>Click for OS-Specific JSON Configuration Snippets...</strong></summary>
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**Windows:**
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```json
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{
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"mcpServers": {
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"UnityMCP": {
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"command": "uv",
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"args": [
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"run",
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"--directory",
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"C:\\Users\\YOUR_USERNAME\\AppData\\Local\\Programs\\UnityMCP\\UnityMcpServer\\src",
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"server.py"
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]
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}
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// ... other servers might be here ...
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}
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}
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```
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- **Windows**:
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(Remember to replace YOUR_USERNAME and use double backslashes \\)
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```bash
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powershell -c "irm https://astral.sh/uv/install.ps1 | iex"
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**macOS:**
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```json
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{
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"mcpServers": {
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"UnityMCP": {
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"command": "uv",
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"args": [
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"run",
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"--directory",
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"/usr/local/bin/UnityMCP/UnityMcpServer/src",
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"server.py"
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]
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}
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// ... other servers might be here ...
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}
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}
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```
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(Replace YOUR_USERNAME if using ~/bin)
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**Linux:**
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```json
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{
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"mcpServers": {
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"UnityMCP": {
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"command": "uv",
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"args": [
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"run",
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"--directory",
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"/home/YOUR_USERNAME/bin/UnityMCP/UnityMcpServer/src",
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"server.py"
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]
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}
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// ... other servers might be here ...
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}
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}
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```
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Then, add uv to your PATH:
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(Replace YOUR_USERNAME)
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```bash
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set Path=%USERPROFILE%\.local\bin;%Path%
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```
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</details>
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- **Linux**:
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---
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```bash
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curl -LsSf https://astral.sh/uv/install.sh | sh
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```
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## Usage ▶️
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For alternative installation methods, see the [uv installation guide](https://docs.astral.sh/uv/getting-started/installation/).
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1. **Open your Unity Project.** The Unity MCP Bridge (package) should connect automatically. Check status via Window > Unity MCP.
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**Important**: Do not proceed without installing uv.
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2. **Start your MCP Client** (Claude, Cursor, etc.). It should automatically launch the Unity MCP Server (Python) using the configuration from Installation Step 3.
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### Step 3: Install the Unity Package
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3. **Interact!** Unity tools should now be available in your MCP Client.
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1. Open Unity and go to `Window > Package Manager`.
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2. Click the `+` button and select `Add package from git URL`.
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3. Enter: `https://github.com/justinpbarnett/unity-mcp.git`
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Example Prompt: `Create a 3D player controller.`
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Once installed, the Unity MCP Package will be available in your Unity project. The server will start automatically when used with an MCP client like Claude Desktop or Cursor.
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## Features
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---
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- **Bidirectional Communication**: Seamlessly send and receive data between Unity and LLMs.
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- **Asset Management**: Import assets, instantiate prefabs, and create new prefabs programmatically.
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- **Scene Control**: Open, save, and modify scenes, plus create and manipulate game objects.
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- **Material Editing**: Apply and modify materials with ease.
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- **Script Integration**: Create, view, and update C# scripts within Unity.
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- **Editor Automation**: Automate Unity Editor tasks like building projects or entering play mode.
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## Contributing 🤝
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## Contributing
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Help make Unity MCP better!
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I’d love your help to make the Unity MCP Server even better! Here’s how to contribute:
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1. **Fork** the main repository.
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1. **Fork the Repository**
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Fork [github.com/justinpbarnett/unity-mcp](https://github.com/justinpbarnett/unity-mcp) to your GitHub account.
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2. **Create a branch** (`feature/your-idea` or `bugfix/your-fix`).
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2. **Create a Branch**
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3. **Make changes.**
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```bash
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git checkout -b feature/your-feature-name
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```
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4. **Commit** (feat: Add cool new feature).
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or
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5. **Push** your branch.
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```bash
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git checkout -b bugfix/your-bugfix-name
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```
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6. **Open a Pull Request** against the master branch.
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3. **Make Changes**
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Implement your feature or fix.
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4. **Commit and Push**
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Use clear, descriptive commit messages:
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---
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```bash
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git commit -m "Add feature: your feature description"
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git push origin feature/your-feature-name
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```
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## Troubleshooting ❓
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5. **Submit a Pull Request**
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Open a pull request to the `master` branch with a description of your changes.
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<details>
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<summary><strong>Click to view common issues and fixes...</strong></summary>
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## License
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- **Unity Bridge Not Running/Connecting:**
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This project is licensed under the **MIT License**. Feel free to use, modify, and distribute it as you see fit. See the full license [here](https://github.com/justinpbarnett/unity-mcp/blob/master/LICENSE).
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- Ensure Unity Editor is open.
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## Troubleshooting
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- Check the status window: Window > Unity MCP.
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Encountering issues? Try these fixes:
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- Restart Unity.
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- **Unity Bridge Not Running**
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Ensure the Unity Editor is open and the MCP window is active. Restart Unity if needed.
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- **MCP Client Not Connecting / Server Not Starting:**
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- **Python Server Not Connected**
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Verify that Python and uv are correctly installed and that the Unity MCP package is properly set up.
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- **Verify Server Path:** Double-check the --directory path in your MCP Client's JSON config. It must exactly match the location where you cloned the UnityMCP repository in Installation Step 1 (e.g., .../Programs/UnityMCP/UnityMcpServer/src).
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- **Configuration Issues with Claude Desktop or Cursor**
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Ensure your MCP client is configured to communicate with the Unity MCP server.
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- **Verify uv:** Make sure uv is installed and working (pip show uv).
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For more help, visit the [issue tracker](https://github.com/justinpbarnett/unity-mcp/issues) or file a new issue.
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- **Run Manually:** Try running the server directly from the terminal to see errors: `# Navigate to the src directory first! cd /path/to/your/UnityMCP/UnityMcpServer/src uv run server.py`
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## Contact
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- **Permissions (macOS/Linux):** If you installed the server in a system location like /usr/local/bin, ensure the user running the MCP client has permission to execute uv and access files there. Installing in ~/bin might be easier.
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Have questions or want to chat about the project? Reach out!
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- **Auto-Configure Failed:**
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- **X**: [@justinpbarnett](https://x.com/justinpbarnett)
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- Use the Manual Configuration steps. Auto-configure might lack permissions to write to the MCP client's config file.
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## Acknowledgments
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A huge thanks to everyone who’s supported this project’s initial release. Special shoutout to Unity Technologies for their excellent Editor API.
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</details>
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Happy coding, and enjoy integrating LLMs with Unity!
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Still stuck? [Open an Issue](https://www.google.com/url?sa=E&q=https%3A%2F%2Fgithub.com%2Fjustinpbarnett%2Funity-mcp%2Fissues).
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---
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## License 📜
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MIT License. See [LICENSE](https://www.google.com/url?sa=E&q=https%3A%2F%2Fgithub.com%2Fjustinpbarnett%2Funity-mcp%2Fblob%2Fmaster%2FLICENSE) file.
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---
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## Contact 👋
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- **X/Twitter:** [@justinpbarnett](https://www.google.com/url?sa=E&q=https%3A%2F%2Fx.com%2Fjustinpbarnett)
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---
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## Acknowledgments 🙏
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Thanks to the contributors and the Unity team.
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