[Jtsummers]

CORBA kind of has you do that. You still have to add details for the implementation, but you write an interface description once and then both the client and the server know how to communicate. A code generator will produce that interface code, and can stub out the implementation part.

A lot of middleware systems do things like this. The critical part of what the author is doing is that they're spending time developing a specification. If you just grow it organically, on a larger project you're more likely to end up with a mess than a coherent system.