skills/smithery.ai/substack-post-crafter

substack-post-crafter

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SKILL.md

Substack Post Crafter Skill

The Email-First Mindset

Substack is primarily email. Every design decision should optimize for:

  1. Subject line (determines open)
  2. Preview text (first 40-90 chars of subtitle)
  3. Hook (determines if they keep reading)
  4. Mobile readability (80% of email opens are on mobile)

Subject Line Mastery

Your subject line = your post title. It determines everything.

The 7-Word Rule

Studies show 7 words hit the sweet spot between too short and too long. Aim for 30-50 characters to fit mobile screens.

Subject Line Formulas

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Apr 11, 2026
substack-post-crafter from smithery.ai