Checks a drafted cold email before it is sent. It tests every claim about the prospect against text you supply, flags claims about you that need proof, checks length, subject line and the single ask, checks the legal basics of commercial email (sender identity, postal address, opt-out), and returns a tightened version with unsupported claims removed.
npx mdskills install proskillpacks/cold-email-checkerRelated
Give it a cold email draft and the text of the prospect's page. It tests every claim about the prospect against that text, flags claims about you that need proof, checks the subject line, the single ask and the length, and lists the commercial email basics from the US FTC's CAN-SPAM guide that the draft is missing. You get a verdict, a claims table, quoted issues and a tightened version with unsupported claims removed.
Any assistant that reads the open SKILL.md format works.
cold-email-checker folder into .agents/skills/ in your project (or ~/.agents/skills/ for everywhere). Or run npx skills add proskillpacks/skills. Or use your tool's own skills folder.No install: open prompt.md, copy it into ChatGPT or any chatbot and paste your material where marked.
Any assistant that reads SKILL.md (Claude, Codex, Gemini CLI, Cursor, GitHub Copilot and others) and any chatbot via prompt.md. Tested on Claude Sonnet.
Before: Draft opening: "Subject: Re: quick question about your growth ... I saw you just launched Hemingway Editor Plus last week and it looks amazing. I've helped 40 software companies double their signups ..."
After (skill output, from a real test run): Test run on a draft we wrote with common flaws, against text from a real public software homepage. Verdict, unedited: "Do not send. The email claims results you can't prove, says the prospect launched something last week when their page doesn't say so, and makes four asks." It marked the launch claim Unsupported, the results claim Needs proof, flagged "Re:" on a first message, listed the missing postal address, opt-out and ad disclosure, and returned a tightened version with [CONFIRM] markers.
1 run on a flawed draft we wrote and text from a real public homepage (Claude Sonnet). The draft is ours, the page text is real.
Made by Pro Skill Packs. MIT licensed: use it, change it, share it.
More skills: https://proskillpacks.github.io/ . Pairs with the paid Cold Email from a Website and Follow-Up Ladder.
Install via CLI
npx mdskills install proskillpacks/cold-email-checkerCold Email Checker is a free, open-source AI agent skill. Checks a drafted cold email before it is sent. It tests every claim about the prospect against text you supply, flags claims about you that need proof, checks length, subject line and the single ask, checks the legal basics of commercial email (sender identity, postal address, opt-out), and returns a tightened version with unsupported claims removed.
Install Cold Email Checker with a single command:
npx mdskills install proskillpacks/cold-email-checkerThis downloads the skill files into your project and your AI agent picks them up automatically.
Cold Email Checker works with Claude Code, Claude Desktop, Cursor, Vscode Copilot, Windsurf, Continue Dev, Codex, Gemini Cli, Amp, Roo Code, Goose, Opencode, Trae, Qodo, Command Code, Chatgpt. Skills use the open SKILL.md format which is compatible with any AI coding agent that reads markdown instructions.