Prices one discount, free-shipping threshold or referral reward against contribution margin: cost per order, share of margin used, break-even lift, code leakage risks, and one recommended offer in two plain sentences. Use alone when you already have the offer, average order value and margin per product; otherwise run email-lifecycle.
Install
npx skills add gooseworks-ai/goose-skills --skill email-lifecycle-offer-mathnpx skills add gooseworks-ai/goose-skills --skill email-lifecycle-offer-math -a claude-code -gnpx skills add gooseworks-ai/goose-skills --skill email-lifecycle-offer-math -a codex -ggemini skills install https://github.com/gooseworks-ai/goose-skills.git --path marketing-agent/skills/email-lifecycle-offer-mathgh skill install gooseworks-ai/goose-skills email-lifecycle-offer-mathgit clone --depth 1 https://github.com/gooseworks-ai/goose-skills /tmp/gooseworks-ai__goose-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/gooseworks-ai__goose-skills/marketing-agent/skills/email-lifecycle-offer-math ~/.claude/skills/email-lifecycle-offer-math # Claude Code
cp -R /tmp/gooseworks-ai__goose-skills/marketing-agent/skills/email-lifecycle-offer-math ~/.agents/skills/email-lifecycle-offer-math # Codex, Cursor, Gemini CLI, Copilot, OpenCode