Unreal Engine MCP Server

What the code does

We read the source, 20 h ago · rules 3dff92dd89df

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

    return found ? path.join(projectPath, found) : undefined;

    const child = spawn(executable, actualArgs, { shell: false, env: childEnv });

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

      - name: Update package.json
        env:
          FINAL_VERSION: ${{ steps.final_version.outputs.version }}

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add unreal-engine-mcp -- npx -y unreal-engine-mcp-server

{
  "mcpServers": {
    "unreal-engine-mcp": {
      "args": [
        "-y",
        "unreal-engine-mcp-server"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.unreal-engine-mcp]
command = "npx"
args = ["-y", "unreal-engine-mcp-server"]

{
  "mcpServers": {
    "unreal-engine-mcp": {
      "args": [
        "-y",
        "unreal-engine-mcp-server"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "unreal-engine-mcp": {
      "args": [
        "-y",
        "unreal-engine-mcp-server"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: LOG_LEVEL (Logging level: debug, info, warn, error (default: info)), MCP_ROUTE_STDOUT_LOGS (Route standard output to standard error to avoid protocol corruption (default: true)), UE_PROJECT_PATH (Absolute path to your Unreal .uproject file), UE_EDITOR_EXE (Path to UnrealEditor-Cmd.exe (optional)), UE_SCREENSHOT_DIR (Directory to save screenshots (optional)), MCP_AUTOMATION_PORT (Automation bridge WebSocket port (default: 8091)), MCP_AUTOMATION_HOST (Automation bridge WebSocket host (default: 127.0.0.1). Set to 0.0.0.0 for LAN access (requires MCP_AUTOMATION_ALLOW_NON_LOOPBACK=true)), MCP_AUTOMATION_ALLOW_NON_LOOPBACK (SECURITY: Allow binding to non-loopback addresses (e.g., 0.0.0.0) for LAN access. Only enable if you understand the security implications. (default: false)), MCP_AUTOMATION_CLIENT_MODE (Run as client connecting to UE (false) or server listening for UE (true) (default: false)), MCP_AUTOMATION_USE_TLS (Use wss:// for the automation bridge client connection (default: false)), MCP_CONNECTION_TIMEOUT_MS (Connection timeout in milliseconds (default: 5000)), MCP_REQUEST_TIMEOUT_MS (Request timeout in milliseconds (default: 30000)), MCP_AUTOMATION_MAX_MESSAGES_PER_MINUTE (Max inbound automation bridge messages per minute before disconnect (default: 600)), MCP_AUTOMATION_MAX_AUTOMATION_REQUESTS_PER_MINUTE (Max inbound automation request messages per minute before disconnect (default: 120)). The author declared them in the registry entry; get the values from the project itself.