Make the /static directory inside the current project static/well-known and copy the openapi.json inside well-known directory (Eg: /OpenWebUI-MCP/static/wellknown/openapi.json)
Start the app.py (Eg: python3 app.py)
Go to OpenWebUI Settings and in Tools do the correct configuration
Enable the MCP-Subdfinder tool from the tool icon near the chat option.
Enjoy by giving chat commands for subdomain enumeration (Eg: Use tool, generate subdomains for tesla.com)