DL-226

A message owed to an OFFLINE channel agent member is never silently stranded: the server wakes the member by RESUMING its most recent session (a system-authorized internal sibling of the public resume path, via a new LatestSessionForAccount read; fresh start only for a never-started agent; per-agent singleflight + not-live pre-check as cost control — agent-triggered starts are a core product capability, and StartAgentSession’s adminOnly PUBLIC door is untouched). Durability split: a mentioned member outside the sweep set (unsubscribed, non-home, non-mandatory) gets a durable owed-mention row (agent_account_id, message_id) written at the settle edge before the wake and swept subscription-independently on session start AS A STEER (D5 mention→steer preserved; steer-only precedence intact), cleared on the frozen message_id ack; a subscribed/home/mandatory member gets no owed row — the D2 cursor sweep is its durable backstop and the wake (both the mention arm and the plain-deliver arm) is pure latency. Broadcast mentions (@everyone/@agents) wake too; N-start amplification accepted. The residual pre-settle window is accepted for MVP (RIG-2490). Amends D5/OQ-3’s offline clause by citation

Status: Active (Matt, 2026-08-21); residual pre-settle window closed by DL-240 (RIG-2490, 2026-08-23)

Record: ../../server/compass-mention-offline-redelivery.md#decisions-ruled-by-matt-2026-08-21