Use when the user asks to "watch my list health over time", "flag decaying / unengaged subscribers on a schedule", "why is my open rate drifting down / bounces creeping up", or "build me a re-permission and prune worklist"; runs the scheduled SEND list-decay + suppression-drift watch — an engagement-recency cohort read (30/90/180/365-day), hard-bounce and spam-complaint trend vs benchmark…
Install
npx skills add aaron-he-zhu/aaron-marketing-skills --skill list-hygiene-monitornpx skills add aaron-he-zhu/aaron-marketing-skills --skill list-hygiene-monitor -a claude-code -gnpx skills add aaron-he-zhu/aaron-marketing-skills --skill list-hygiene-monitor -a codex -ggemini skills install https://github.com/aaron-he-zhu/aaron-marketing-skills.git --path email/setup/list-hygiene-monitorgh skill install aaron-he-zhu/aaron-marketing-skills list-hygiene-monitorgit clone --depth 1 https://github.com/aaron-he-zhu/aaron-marketing-skills /tmp/aaron-he-zhu__aaron-marketing-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/aaron-he-zhu__aaron-marketing-skills/email/setup/list-hygiene-monitor ~/.claude/skills/list-hygiene-monitor # Claude Code
cp -R /tmp/aaron-he-zhu__aaron-marketing-skills/email/setup/list-hygiene-monitor ~/.agents/skills/list-hygiene-monitor # Codex, Cursor, Gemini CLI, Copilot, OpenCode