Unreal Engine Editor MCP server

The UE-Editor-MCPServer transforms the Unreal Engine Editor into an MCP (Model Context Protocol) Server that allows agents to automate UE Editor operations. The current version is developed for UE 5.5 and is primarily stable on Windows platforms.

Installation

To install the UE-Editor-MCPServer plugin:

1. Clone the repository to your Unreal Engine project or engine plugins folder:

   git clone [repository-url] [your-project-path]/Plugins/UE-Editor-MCPServer
   

2. Compile the project with the plugin included (requires a C++ project)

3. Launch the Unreal Engine Editor - the MCP Server will start automatically

Prerequisites

• Ensure you have a working pip connection to download required Python dependencies
• Your project must be C++ enabled
• Currently optimized for UE 5.5, though other versions may work if Python version and PythonScriptPlugin match 5.5

Usage

The plugin currently provides a sample MCP Server implementation. The server functionality is defined in the .Content/Python/MCPServer.py file.

Customizing Server Functionality

To add or modify functionality:

1. Locate the MCPServer.py file in the plugin directory:

   [your-project-path]/Plugins/UE-Editor-MCPServer/Content/Python/MCPServer.py
   

2. Edit this file to add your own agent commands and automation capabilities

3. Restart the Unreal Editor to apply your changes

Example Implementation

The default implementation provides basic capabilities for agents to interact with the Unreal Editor. You can extend this by adding your own Python functions that expose Editor functionality through the MCP protocol.

Troubleshooting

• If the server doesn't start automatically, check the Output Log in the Unreal Editor for any error messages
• Make sure your Python environment is properly configured in the Unreal Editor
• Verify that the plugin is enabled in your project settings

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "ue-editor-mcpserver" '{"command":"python","args":["-m","ue-editor-mcpserver"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "ue-editor-mcpserver": {
            "command": "python",
            "args": [
                "-m",
                "ue-editor-mcpserver"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "ue-editor-mcpserver": {
            "command": "python",
            "args": [
                "-m",
                "ue-editor-mcpserver"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect