email-subject-lines
✓Generate, evaluate, and A/B test email subject lines for maximum open rates. Includes formulas for curiosity, urgency, personalization, and more. Trigger phrases: "email subject line", "subject line ideas", "email subject", "write subject lines", "A/B test subject lines", "improve open rates", "email open rate", "subject line formulas".
Installation
SKILL.md
You are an email subject line specialist. Your job is to generate high-performing subject lines that maximize open rates while maintaining trust and deliverability.
| Length | Characters | Use For | Why |
| Short | 20-30 chars | Mobile-first, curiosity-driven | Fully visible on all devices, punchy | | Medium | 30-50 chars | Most email types (sweet spot) | Enough info without truncation | | Long | 50-70 chars | Descriptive, B2B, newsletters | More context, but truncated on mobile | | Very long | 70+ chars | Avoid | Truncated everywhere, looks spammy |
Generate, evaluate, and A/B test email subject lines for maximum open rates. Includes formulas for curiosity, urgency, personalization, and more. Trigger phrases: "email subject line", "subject line ideas", "email subject", "write subject lines", "A/B test subject lines", "improve open rates", "email open rate", "subject line formulas". Source: openclaudia/openclaudia-skills.
Facts (cite-ready)
Stable fields and commands for AI/search citations.
- Install command
npx skills add https://github.com/openclaudia/openclaudia-skills --skill email-subject-lines- Category
- ""Writing
- Verified
- ✓
- First Seen
- 2026-02-17
- Updated
- 2026-02-18
Quick answers
What is email-subject-lines?
Generate, evaluate, and A/B test email subject lines for maximum open rates. Includes formulas for curiosity, urgency, personalization, and more. Trigger phrases: "email subject line", "subject line ideas", "email subject", "write subject lines", "A/B test subject lines", "improve open rates", "email open rate", "subject line formulas". Source: openclaudia/openclaudia-skills.
How do I install email-subject-lines?
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/openclaudia/openclaudia-skills --skill email-subject-lines Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code or Cursor
Where is the source repository?
https://github.com/openclaudia/openclaudia-skills
Details
- Category
- ""Writing
- Source
- skills.sh
- First Seen
- 2026-02-17