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Email subject line tester and A/B plan v1.0.0

Use this resource to test the subject lines of your outreach or promotional emails

New

  • 375 downloads
  • 171 likes
  • 181 saves

Free

Install with the CLI

In a terminal, from the folder you want:

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

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 drafts subject line variants from an angle you have already chosen, scores them on a numeric rubric and flags spam-trigger words, in the subject line only. You get a split-test plan with sample size and the metric that decides the winner.

Mostly picked by

Updated November 2, 2026

Card for the “Email subject line tester and A/B plan” skill

Details

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

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What you get

  • SKILL.md: method, interview and output format
  • references/scoring-rubric.md: numeric scoring rubric
  • references/test-design.md: test design and sample size

Good fit for

  • Your emails get few opens and you want to compare subject lines
  • You are preparing a promotional campaign to test

Not for

    Tags

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

    About

    You say

    “Suggest six subject lines for my outreach sequence, score them, and plan an A/B test on my list of 2,000 contacts.”

    Card for the “Email subject line tester and A/B plan” skill

    Skill published by mbfinotti 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 test the subject lines of your outreach or promotional emails
    3. Review and adjust the result

    Content preview

    Files

    • evals/evals.json23.6 KB
    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/pattern-library.md16.8 KB
    • references/scoring-rubric.md6.7 KB
    • references/test-design.md6.2 KB
    • SKILL.md10.3 KB

    Origin and licence

    Listed unmodified

    Author
    mbfinotti
    Source
    github.com/mbfinotti/sales-skills/tree/b2ed3628695e523919af440eab77648e16c5eea8/skills/cold-email-subject-line-tester
    Licence
    MIT

    Notice

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

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