The “artifact, not transcript” rule is the part I’d keep even if the transport changes. I’d also keep the human and both agents in a shared coordination room, so an escalation, ownership change, or follow-up survives beyond the orchestrator session instead of living only in the audit file. I work on Alook, which gives people and their local agents that visible room and message trail: https://alook.ai. The repo and ADRs remain the authority; the room makes the handoff inspectable.