Wikipedia editors spent months cataloging 35 telltale signs of AI writing. Siqi Chen — Runway Financial CEO, ex-Zynga, better known as @blader — handed that list to Claude Code and said: build a skill that avoids all of them. The result is Humanizer: 43.4K stars, up nearly 1,000 in a single day, MIT-licensed.
What it is
An agent skill — a Markdown instruction file, no model, no dependencies. It runs two passes over your text: a free rewrite first, then a line-by-line audit against the 35 patterns and the original facts. Inflated phrasing, stock transitions, over-hedging, chatbot residue — deleted. Names, numbers, quotes, and code stay untouched. Give it 2-3 paragraphs of your own writing and it mirrors your voice instead of applying a house style.
Plugging it into your agent
Install is one line: /plugin marketplace add blader/humanizer in Claude Code, or npx skills add blader/humanizer for any skill-compatible agent. Version 2.11.2 made Claude Desktop a simple zip upload. Typical use case: pipe every AI draft through it before it ships.
The reason it blew up: everyone else is fighting AI slop with detectors. Humanizer takes the other side — make the output not need detecting.
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