list-hygiene-monitor

# List Hygiene Monitor The ongoing hygiene watch, not the pre-flight — a scheduled read of list decay and suppression drift that turns the ESP export into a segmented **re-permission / sunset / prune worklist**. It cohorts the list by engagement recency (30/90/180/365-day last-open/click), trends hard-bounce and spam-complaint rates against benchmark and the prior baseline, and checks suppression-list growth and leakage — feeding the SEND **S (Sender-integrity / Deliverability, list-hygiene sub-item)** and **E (Engagement, engagement-decay / sunset sub-item)** signals. **Scope guard: this skill produces the recurring hygiene worklist and the S-hygiene / E-decay reads only; it does NOT run the one-time authentication pre-flight ([deliverability-qa](../deliverability-qa/SKILL.md)), own the consent / suppression record ([consent-registry](../../../protocol/consent-registry/SKILL.md)), or compute the goal-weighted EQS / enforce the `S1`/`S2`/`N1`/`D1` vetoes ([email-quality-auditor](../../deliver/email-quality-auditor/SKILL.md)).** deliverability-qa answers "will this one send land?"; this skill answers "is the list rotting between sends, and who do I re-permission or prune?" — build the worklist here, let the gate render the EQS verdict. ## Quick Start ``` Watch my list health for [program]. Here is my ESP engagement export (last-open/click per subscriber) and bounce/complaint report — give me the decay cohorts and a prune worklist. ``` ``` My open rate is drifting down and ...