It doesn’t contain any information at all about the structure of the JSON output. Is this a greenfield endpoint and anything will work is does it need to conform to an existing API? What about response codes for different failure modes? What about logging?

Your comment exemplifies what a lot of people complain about vibe coding: it works great for greenfielding CRUD apps, but it’s a bitch to use in a real code base.

A programmer wouldn’t write a prompt like that. Notice the questions the OP talked about out answering first.