DL-187

initial_prompt is REMOVED from the whole contract (StartAgentSessionRequest field 2, SpawnAgentRequest field 2, SpawnPeerRequest field 3 — numbers AND names reserved; server/runner/SDK/UI/e2e consumers cut over atomically, no fallback): an agent session ALWAYS starts idle and its first turn arrives as a channel message over the RIG-1569 deliver path (DeliverControl → the idle-deliver arm starts a turn); a provisioned peer’s brief is a post from its provisioning manager into their per-pair DM channel (home channel for human owners)

Status: Active (Matt, 2026-08-10)

Record: ../../agent/compass-first-turn-delivery/design.md#approach