Individual skill
email-subject-lines
Use this skill when you need a subject line for any email, want to improve open rates, or are A/B testing subject lines. Generates 5-10 high-converting email subject lines using 100 proven direct-response frameworks organized by psychological trigger (curiosity, urgency, pain point, authority, results, contrarian, value, action, empowerment, story, trend, quick win). Analyzes your email content to match the right frameworks, then outputs subject line variations with preview text recommendations. Trigger on "subject line", "email subject", "what should the subject be", "help with this email subject", "write subject lines", "improve my open rates", "subject line ideas", or any request involving email + subject line.
skills/daniel-bustamante/email-subject-lines/SKILL.md
Source commit 5d786aad0c7b2ca59b1abf1f601f9407ca261996
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- Last checked
- Nov 11, 2026
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- Oct 20, 2026
- License
- MIT
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# Generate Email Subject Lines
Generate 5-10 high-converting subject lines for any email using 100 battle-tested frameworks from elite direct-response marketers — matched to your email's specific intent, emotion, and hook.
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## Why This Works
Subject lines are the most leveraged words you'll ever write. A 10% improvement in open rate on a 10,000-person list means 1,000 more people reading your email — from changing a few words. But most people write subject lines last, when they're tired, using whatever comes to mind first. This skill reverses that by matching your email's intent to proven psychological frameworks that have generated millions in revenue across thousands of campaigns. Every framework is categorized by trigger type so Claude picks the right ones for YOUR specific email.
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## How to Use This Skill
