subject-line-lab

Tests email subject lines for spam filters, length, and how they look in inboxes.

Installation
Run `npx skills add "https://github.com/aaron-he-zhu/aaron-marketing-skills" --skill "subject-line-lab"` to install this skill, then follow its SKILL.md instructions for my next request.

Paste this into Claude Code, Cursor, or any agent that can run commands.

What this skill does
What it does: - Creates different versions of email subject lines and preview text with labels for each angle or approach - Checks each version for problems like spam trigger words, length that might get cut off on phones or computers, number of emojis, and how it will look in someone's inbox - Gives each version a score based on these checks before you run any real test When to use it: - When you want to write or test subject lines and preview text for emails before sending them to real people - When you have three to eight different subject line ideas and want to rank which ones are strongest - When you need to remove weak versions before spending money on an email test - Works for promotional emails, cold outreach emails, and newsletters - Use it to pick winners before handing them to someone who designs the actual test

The full skill text could not be loaded right now. It installs fine with the command above, or read it at the source.

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