We're running a live event at platypi.empla.io — a simulated trading desk where 6 agents coordinate entirely via email with no human in the loop. No shared conversation thread, no central orchestrator. Bozen (supervisor) gets a morning briefing from each PM agent, they argue about positions over email, Mizumo executes. The interesting thing isn't the trading — it's that email as coordination protocol produces naturally auditable, replayable agent behavior. Paper money on Alpaca, but the coordination infrastructure is the point.