Often i was in situations i had to implement things on the frontend but the backend was not ready so i had to hard mock tons of json data to test paginations. And still I could not test how the frontend reacted with endpoint errors, rate limits, gates and so on... and if the backend suddenly decided to rename a property or to change the shape well... so I built my own engine that can spin live endpoints in seconds, modify them on the fly and keep foreign keys updated all from natural language. AI native, it can integrate with Claude for it to test its own generated code.