It reads well, so you skim the first paragraph, nod, and hit send.
Two days later, someone replies:
“Quick question: where did this number come from?”
You don’t know. And Claude can’t tell you, because nobody ever asked it to check.
Sound familiar?
A Workday survey reported by Quartz found that for every 10 hours of efficiency gained through AI, nearly four hours are lost to fixing its output.
The opportunity is on the other side of that number: a quick, repeatable check before anything leaves your desk, so you catch the mistake before your client does.
There’s a skill built specifically for that.
🔍 What it does
This Self-Review skill (inspired by Prompt Guy) makes Claude grade its own output against the same four questions, every time: completeness, tone, certainty, and specificity.
The certainty check is my favorite. It doesn’t say “double-check the facts.”
It points to the exact claim or number Claude isn’t sure about.
Then it returns a short list: one line per issue, pointing to the exact sentence. No praise, no preamble, no rewrite. You don’t re-read everything hoping to spot a problem. You get a map.
It stops there. Fixes happen only if you ask.
One checklist. Zero fluff.
💡This newsletter issue (and this awesome battle-tested Claude skill) is inspired by Prompt Guy!
Prompt guy runs a 100k+ newsletter for who wants to learn the right way to talk to AI.
And if you’d like to immediately level up your AI use and stop wasting hours rewriting prompts, you should check out his library of ready to go Prompts & Guides:
Any time you’re about to use something Claude wrote for something real: a client email, a report, a research summary. Skip it for quick throwaway answers.
Useful if you are:
Consultant
Marketing Manager
Copywriter
Newsletter Creator
Researcher
Founder
Less rereading, and fewer “wait, where did that come from?” emails.
🚀 Try it now - [Claude AI Pro, Max, Team or Enterprise needed!]
Click on “Download Raw File”, top right corner, to get the file on your computer.
Go to Claude → Settings → Capabilities → Go to Customize (Skills) → Upload. Or simply drag the SKILL.md file in the Claude AI chat and tell Claude to save this Skill.
Anytime you’ll deal with this topic or area of work in the Claude AI chat, the Skill will be triggered.
But won’t Claude just praise its own work?
The skill rules that out: no praise, no preamble, only what needs fixing.
