I was going through some GitHub links I'd saved and almost missed this one.
A repo called humanizer by blader. A single skill file for Claude. The description said: "Remove signs of AI-generated writing from text."
I added it to Claude in about two minutes. Then I ran one of my old AI-drafted blog posts through it.
I've been using it every day since.
Why it matters
Here's the thing nobody says out loud: AI-generated text has a specific smell. You know it when you read it. "Groundbreaking." "Seamless." "In today's rapidly evolving landscape." The three bullet points. The conclusion that says "the future looks bright."
GPTZero catches it. Your readers catch it too — they just don't say anything.
I'd tried the usual humanizer web apps. You paste your text, wait, get back slightly different AI text. Same structure. Same hollow rhythm. Just different synonyms.
This is different. It runs inside Claude, targets 20+ specific patterns by name, and does a second pass where it asks itself: "what still makes this obviously AI-generated?" then fixes that too.
That second pass is what I hadn't seen before.
How to add it (takes 2 minutes)
Step 1 — Download the repo
Go to github.com/blader/humanizer, click the green Code button, then Download ZIP.
You'll get a file called humanizer-main.zip in your Downloads.
Step 2 — Open Claude and go to Customize
In claude.ai, look at the left sidebar. Click Customize.
Step 3 — Add the skill
Inside Customize, click Skills in the left panel. Then hit the + button at the top right of the Skills list. A dropdown appears — click Upload a skill.
Choose the humanizer-main.zip file you just downloaded. Claude uploads and installs it automatically.
Step 4 — Confirm it's there
After uploading, you'll see humanizer appear under "My skills" with a green "Uploaded humanizer" confirmation. The skill shows version 2.2.0 and lists its allowed tools.
Done. That's literally it.
How to use it
Start a New chat. At the end of your message (or the beginning), just tell Claude to use the humanizer skill:
use humanizer skill to rewrite this email:
[paste your AI-generated text here]
Or:
write a product description for X, then use humanizer skill to make it sound human
Claude reads the skill instructions, scans your text for AI patterns, rewrites, then audits its own output. The whole thing takes seconds.
What it actually fixes
Here's a real before/after from my own writing.
Before:
In today's rapidly evolving landscape, the platform serves as a testament to seamless innovation, fostering deeper connections and contributing to groundbreaking outcomes for teams of all sizes.
After:
I've used it for two months. Onboarding took ten minutes and the export options got annoying eventually. Worth trying on the free plan first.
The after version is shorter, has an opinion, and sounds like a person who actually used the thing.
One more — a conclusion:
Before:
In conclusion, the future looks bright. Exciting times lie ahead as we continue this journey toward excellence.
After:
The tools are getting better. Whether that changes how most developers work, or just how senior developers work — I genuinely don't know yet.
The patterns it targets specifically:
| Pattern | AI Example | After |
|---|---|---|
| Significance inflation | "marks a pivotal moment" | say what actually happened |
| Hedging | "could potentially be argued" | "I think" |
| Copula avoidance | "serves as a foundation for" | "is" |
| -ing pile | "highlighting how this underscores the importance of fostering" | cut it |
| Chatbot opener | "Great question!" | just answer |
| Generic conclusion | "the future looks bright" | say something real |
The part I didn't expect
It's open source and forkable. I added two patterns specific to how I write. "It's worth noting that" is one. Took five minutes. The SKILL.md file is readable enough that you don't need to understand prompting to extend it.
23 open issues, 21 pull requests. People are actively adding patterns. There are forks for technical docs, marketing copy, academic writing.
That's the right shape for this kind of tool — not a locked product, a shared starting point.
Star it, fork it, add your own patterns: github.com/blader/humanizer
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