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Email subject lines and A/B tests v1.0.0

Use this resource to write and test email subject lines to lift open rates

New

  • 443 downloads
  • 223 likes
  • 207 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install email-subject-line-tests

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent gathers the email’s purpose, content, audience and tone, then proposes subject lines across seven formulas and pairs them with preview text. You get a ranked list with variants ready for an A/B test.

Mostly picked by

Updated November 2, 2026

Card for the “Email subject lines and A/B tests” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md : subject length rules and preview text rules
  • SKILL.md : seven formulas (curiosity, urgency, personalization, question, number, how-to, controversy)

Good fit for

  • Your newsletter open rates have plateaued
  • You want to test two subject lines for a promotional campaign

Not for

    Tags

    • subject line
    • open rate
    • a/b test
    • newsletter

    About

    You say

    “Suggest ten subject lines for our new collection announcement, one per formula.”

    Card for the “Email subject lines and A/B tests” skill

    Skill published by openclaudia under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to write and test email subject lines to lift open rates
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md13 KB

    Origin and licence

    Listed unmodified

    Author
    openclaudia
    Source
    github.com/openclaudia/openclaudia-skills/tree/e88f5a9fc726183cd3c90f5c279117bbae7da3b3/skills/email-subject-lines
    Licence
    MIT

    Notice

    « email-subject-lines » (openclaudia, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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