Free, open-source AI writing humanizer and detector. 55 patterns, 5 voices, a 0-100 AI-tell score, and nothing leaves your machine.
> /plugin marketplace add Aboudjem/humanizer-skill> /plugin install humanizer@humanizer
Repo: Aboudjem/humanizer-skill
What's inside
claude plugin marketplace add Aboudjem/10x
claude plugin install humanizer@10x
AI writing has a fingerprint. Sentences all run about the same length, the same safe words keep coming back, and filler like "in today's landscape" pads the gaps. Humanizer names 55 of those habits, finds the ones in your text, and rewrites it in a voice you pick. The CLI scores the text 0 to 100 from four measurable signals, not from a count of the 55.
Two words worth a gloss. Burstiness is how much your sentence lengths vary, and an AI tell is one of those giveaway habits.
In Claude Code, through the 10x marketplace:
claude plugin marketplace add Aboudjem/10x
claude plugin install humanizer@10x
In 70+ other agents, one line. The skills CLI links the
skill into the directory your agent reads, or copies it with --copy:
npx skills add Aboudjem/humanizer-skill
Project-scoped, so it travels with your repo:
mkdir -p .claude/skills/humanizer && curl -sL https://raw.githubusercontent.com/Aboudjem/humanizer-skill/main/skills/humanizer/SKILL.md -o .claude/skills/humanizer/SKILL.md
Swap the folder for another editor: .cursor/skills/, .github/skills/ for Copilot, .codex/skills/,
.gemini/skills/, .windsurf/skills/, .continue/skills/. Use ~/.claude/skills/ for a global
install. Full paths per agent are in docs/editors.md.
1. Score something you already wrote. This scans, it does not change the file:
node cli/index.js score examples/blog-post/before.md
examples/blog-post/before.md
Score: 46/100 (Mixed)
Signal breakdown (points out of 100):
lexical 40.0 weight 0.4 vocabTellDensity 0.0818
repetition 6.0 weight 0.14 trigramRepetition 0.077
burstiness 0.0 weight 0.28 burstiness 0.798
diversity 0.0 weight 0.18 mattr 0.866
words: 391
sentences: 11
mean sentence length: 35.55
... plus 9 more metric lines
Lower is more human. The breakdown says which signal cost the points, so you know what to fix first.
2. Rewrite it in a voice. In your editor, call the skill on your own draft:
/humanizer --file draft.md --voice technical
Before: This comprehensive guide delves into the intricacies of our authentication system.
After: This guide explains how our authentication system works.
The rewrite cuts the tells. It never adds a fact the source did not have.
3. Check the rewrite kept the facts. A rewrite that quietly drops a number is the real risk:
node cli/index.js compare --before examples/blog-post/before.md \
--after examples/blog-post/after.md --check-facts
It exits 1 and names anything lost: a number, a percentage, a URL, a date, a version, or an acronym.
score command, so a bad number points at a specific cause.casual, professional, technical, warm, blunt.| IDs | Category | Examples |
|---|---|---|
| P1-P8 | Content | Significance inflation, promotional language, AI vocabulary ("delve", "leverage") |
| P9-P18 | Language and style | Negative parallelisms, em dash overuse, structured-list syndrome |
| P19-P21 | Communication | Chatbot artifacts, knowledge-cutoff disclaimers, sycophantic tone |
| P22-P30 | Filler and hedging | Filler phrases, generic conclusions, uniform sentence length |
| P31-P43 | Emerging | Elegant variation, placeholder text, chatbot markup leaks, infomercial hooks |
| P44-P55 | Craft and forensic | False agency, aphorism formulas, unicode obfuscation, leftover hedge debris |
Every pattern has a write-up and its trigger list in SKILL.md. In
references/patterns.md, 34 of the 55 also carry a
before/after pair, one per pattern that benefits from one.
The core catalog (P1-P30) draws on
Wikipedia: Signs of AI writing (CC BY-SA).
Works in Claude Code, Cursor, Codex, Copilot, Gemini CLI, and 70+ other agents through npx skills add.
| Agent | One-line install |
|---|---|
| Claude Code | claude plugin install humanizer@10x |
| Any of 70+ agents | npx skills add Aboudjem/humanizer-skill |
| One named agent (Cursor, Codex, Copilot, Gemini CLI, OpenCode, Zed) | add -a <agent> to that line |
| Everything else | the table in docs/editors.md |
The skill is Markdown, so it runs on whatever model your editor points at.
[!IMPORTANT] Nothing leaves your machine. The skill is one Markdown file your editor reads locally, and the optional metrics CLI is plain Node with no dependencies and no network calls. No telemetry, no account, no API key.
FAQ
aboudjem-humanizer is a Claude Code plugin with 1 hand-picked skill for content work, indexed on Flowy. Install it with the command on its page. It includes humanizer. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.
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