Installation
Copy the prompt below and send it to your AI assistant (e.g. Claude Code) — it will follow the instructions and install automatically.
Install the "subject-line-lab" skill by following the instructions at https://skill123.me/install/subject-line-lab.
Run in your terminal — downloads and installs to ~/.claude/skills/.
curl -fsSL https://skill123.me/install/subject-line-lab.sh | bash
Download the zip and extract it into your skills directory (e.g. ~/.claude/skills/), then restart your session.
⬇ Download v1.0.0 · 7 KBAbout this skill
Overview
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 + mobile, emoji-count, and the inbox preview render (from-name + subject + preheader) — before any test is run. Not for the body copy or CTA — use email-creative-builder; not for the A/B test design or significance read — use send-experiment-designer; not for the profile-weighted EQS or the S1/S2/N1/D1 vetoes — use email-quality-auditor. 邮件主题行生成/主题行预打分/截断与垃圾词检查
Source
- Repo: https://github.com/aaron-he-zhu/aaron-marketing-skills
- Path: email/engage/subject-line-lab
Evaluation
AI-evaluated 2026-09-03: Tight, self-contained pre-scoring workflow: stable variant ids, four labeled heuristics (spam, truncation, emoji, preview), promise-not-just-overflow truncation rule, and explicit flag-not-verdict framing. Drop-in useful for any email marketer with zero tooling prerequisites; safety is careful with no invented claims, untrusted input handling, and no pre-score presented as a placement guarantee.