unreal-engine-mcp MCP Server

Connect to unreal-engine-mcp

Hosted endpoint — paste into any MCP client.

Environment variables

Configuration this server reads at startup.

• 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)

Resources

Where to find authoritative docs and source for unreal-engine-mcp.

• Source repository