I saw some coding harness (OMP i think?) labeling sub-agent comms as "IRC" for the agents to use. XMPP is another one I bet AI would just understand what to use it for. I have been absorbing whether tried-and-true old tech like these are going to revive in the AI era, just because it's "locked in" in the training data. AI is going to keep some of these torches burning forever maybe.