I like the idea of sending messages between agents (colleagues), but I'm seeing more and more approaches like these where we try (with agents) to emulate the classic corp experience. Yes, there is even a PM tool (https://github.com/automazeio/ccpm) that creates PRDs and works on them.

I'm a bit skeptical about replicating the (IMHO) broken process of big corporations - but it would he extremely funny if it turns out that this really works

It actually does work well. And perhaps it’s not even that surprising that it would work, because we know that’s what works already for human developers and companies, so we have an existence proof already.