When many accounts join in a short window (six in thirty seconds by default), mods get a raid alert listing the new accounts. Tune thresholds in /settings.
Auto-lockdown
Optional auto-lockdown closes text channels when a raid triggers. Pair with a staff runbook so someone runs /lockdown locked:false scope:server when the wave is handled.
Manual lockdown
/lockdown locked:true scope:channel locks one channel; scope:server locks every text channel Sift can manage. Unlock restores prior lock state rather than guessing.
Content vs structure
Raid tools protect join spam and channel access. Message spam during a raid still hits flood and smart-check rules — see server protection in What Sift catches.