subject-line-lab
Use when the user asks to "generate subject line variants", "pre-score my subject lines", or "will this subject get truncated / trigger spam filters"; produces a labeled subject + preheader variant set and a per-variant heuristic pre-score card — spam-trigger flags, length/truncation across desktop…
Install / Use
npx skills add aaron-he-zhu/aaron-marketing-skills --skill subject-line-labInstalls into whichever agent you are using.
SKILL.md
Installable skill definition
Quality Score
Category
CommunicationSupported Platforms
Our assessment of subject-line-lab
subject-line-lab scores 86/100 on our quality scale, 197th of 291 Communication skills we index.
We have not analysed the SKILL.md file itself yet, so the content part of this score is an estimate until our crawler reaches it.
With 2,835 GitHub stars, it is one of the more widely adopted skills in the catalogue.
Maintenance, license and trust
- The repository was last updated 4 days ago, so subject-line-lab is actively maintained.
- It is released under the Apache-2.0 license, a permissive license that allows use, modification and commercial use with attribution.
- Its trust signals score 100/100, with no cautions. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.
subject-line-lab compared with similar skills
All 4 of these similar skills score higher than subject-line-lab; compare them before choosing.
| Skill | Score | Stars | Updated | Format |
|---|---|---|---|---|
| subject-line-lab (this skill)by aaron-he-zhu | 86 | 2.8k | 4d ago | SKILL.md |
| algorithmic-artby anthropics | 100 | 177.9k | 6d ago | SKILL.md |
| pptxby anthropics | 100 | 177.9k | 6d ago | SKILL.md |
| designby nextlevelbuilder | 100 | 130.2k | 7d ago | SKILL.md |
| ui-ux-pro-maxby nextlevelbuilder | 100 | 130.2k | 7d ago | SKILL.md |
Frequently asked questions
- How do I install subject-line-lab?
- Run
npx skills add aaron-he-zhu/aaron-marketing-skills --skill subject-line-lab. The install tabs above show the steps for each supported agent. - Which AI agents does subject-line-lab work with?
- It is written for Universal, as a SKILL.md file. Other agents that read the same format can often use it too.
- Is subject-line-lab safe to use?
- It is Apache-2.0-licensed and scores 100/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
- Is subject-line-lab still maintained?
- The repository was last updated 4 days ago, so subject-line-lab is actively maintained.
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Languages
Trust signals
From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.