This is pretty basic stuff, just build a bunch of tools with any openAI compatible api and you'll get good. I think stuff like this is kinda overcomplicating simple problems. "Framework free", bruh its just jsonRPC for the most part.
This was probably made to show off for an interview or something, hence why they're throwing throwing around the term "FDE" so much. Its meant to impress a very specific type of person (gullible managers).