Cold email subject lines
When to use: Subject lines, low open rate, “make these subjects better”, or finishing a complete cold email after the offer and body are set.
What it does
Section titled “What it does”Cold email subject lines audits or drafts subject lines — short, clear, low spam risk — and helps you plan fair A/B tests measured on reply rate, not vanity opens. It does not change campaigns or send mail.
Try saying this
Section titled “Try saying this”Give me three all-lowercase subject line options for this email, under 40 characters.
I’ll propose three short, clear subjects (no spam tells) you can paste — I won’t change or send any campaigns.
What you’ll get
Section titled “What you’ll get”- A few ready-to-paste options (or a scorecard when you ask for an audit)
- Spam-word and formatting flags (ALL CAPS, fake Re:, emoji, etc.)
- Simple guidance on how much volume you need for a meaningful test
Get started
Section titled “Get started”No OutboundSync API key. Install:
npx skills add outboundsync/skills --skill cold-email-subject-lines -gMore setup: Install skills. Rubrics: skills/cold-email-subject-lines/.
