Humanizer
Humanizer rewrites AI-sounding text so it reads like a person wrote it, without changing what it says. Because it is just Markdown, it works with any agent that supports skills.
Installation
Install Humanizer with the Skills CLI:
npx skills add blader/humanizer --global
Leave off --global to install Humanizer only in the current project. Add --agent or --agent '*' to choose which agents receive it, then reload their skills. The skill answers to /humanizer.
Claude Code 2.1.142 or newer can install the plugin instead:
/plugin marketplace add blader/humanizer
/plugin install humanizer@humanizer
The plugin answers to /humanizer:humanizer.
In Claude Desktop, download this repository as a ZIP and upload it as a skill. For a manual install, copy SKILL.md into the agent's skill folder.
Usage
Call the skill directly:
/humanizer
[paste your text here]
Or ask in plain language:
Please humanize this text: [your text]
To rewrite a file, give Humanizer its path:
Humanize the prose in docs/launch-post.md
Match your voice
If you want the rewrite to sound more like you, include a sample:
/humanizer
Here's a sample of my writing for voice matching:
[paste 2-3 paragraphs of your own writing]
Now humanize this text:
[paste AI text to humanize]
Humanizer follows the sample's rhythm, word choice, punctuation, and deliberate quirks, including dashes if you use them.
How it works
A language model writes whatever is most likely to come next, so by default it makes the choice that fits the widest range of readers and subjects. A person chooses for one reader and one subject. Every tell Humanizer looks for is a form of that default choice: a sentence that signals importance instead of adding a fact, rhythm or formatting applied by rule, an ordinary fact dressed as a pivotal one, or text left over from the chat.
"LLMs use statistical algorithms to guess what should come next. The result tends toward the most statistically likely result that applies to the widest variety of cases." Wikipedia, "Signs of AI writing"
Humanizer marks every tell it finds, strongest first. It drafts a rewrite without treating the original structure as fixed, checks the draft against the patterns and the original claims, and then writes the final version. It does not make things up. A name, number, date, quote, citation, or other factual detail must come from the source or the writer, and if a sentence needs a detail that is missing, Humanizer asks instead of inventing one.
When you paste text, Humanizer shows its work: the first rewrite, a short critique of anything that still sounds artificial, and the final version. Point it at a file and it changes only the prose, leaving code, data, frontmatter, and link targets alone. Personal writing keeps the writer's opinions and quirks. Technical and reference prose stays neutral and plain.
The 25 patterns
The patterns are numbered by strength and frequency. The first five justify an edit on a single sighting. Patterns marked weak alone count only when several tells share a passage, because a careful writer may use any one of them on purpose.
A. Staging instead of stating
| # | Pattern | Before | After |
|---|---|---|---|
| 1 | Not X but Y | "It's not just X, it's Y", "This doesn't mean X. It means Y." | State the point directly |
| 2 | One-line closers and dramatic fragments | "That is the real win." after every section; "No prior. No nostalgia." | Cut the closer that repeats; merge fragments into a specific claim |
| 3 | Sayings that sound deep | "At its core, what matters is...", "Symmetry is the language of trust" | Replace the saying with the specific claim |
| 4 | Staged run-up before the point | "Let's dive in", "Honestly? It depends..." | Remove the run-up and state the point |
| 5 | Arguing with no one | "This isn't mainly about...", "A tempting approach would be..." | Remove the unraised objection or fake option; keep any real claim |
B. Rhythm by rule
| # | Pattern | Before | After |
|---|---|---|---|
| 6 | Forced triads | "innovation, inspiration, and insights"; three examples plus a lesson | Use the number of items the meaning needs |
| 7 | Repeated sentence openings | "She noted... She noted... She filed..." | Merge the sentences or change the subject |
| 8 | Dashes as the universal connector (weak alone) | "institutions—not the people—yet this continues—" | Use periods, commas, colons, or parentheses; match a sample that uses dashes |
| 9 | Stacked qualifiers (weak alone) | "could potentially possibly be argued" | Keep only qualifiers the source supports |
| 10 | Hyphenated pairs everywhere (weak alone) | "the team is cross-functional" | Keep only the hyphens grammar needs |
| 11 | Passive voice and missing subjects (weak alone) | "No configuration file needed" | Name the actor when that helps |
C. Inflation and borrowed authority
| # | Pattern | Before | After |
|---|---|---|---|
| 12 | Overused AI words | "delve... testament... landscape... showcasing" | Use plain words; the list in SKILL.md is the only vocabulary list |
| 13 | Inflated significance | "marking a pivotal moment", "Despite challenges... continues to thrive", "The future looks bright" | Keep the fact and drop the significance; end on the last concrete fact |
| 14 | Vague connection or association | "associated with the leadership of", "in connection with" | State the relationship the source gives |
| 15 | Shallow -ing riders | "symbolizing... reflecting... showcasing..." | Keep only what the source supports |
| 16 | Sales language | "nestled within the breathtaking region" | State what the thing is |
| 17 | Borrowed authority | "Experts believe...", "cited in NYT, BBC, FT, and The Hindu" | Name a real source and what it said, or remove the claim or list |
| 18 | Avoiding is, are, and has | "serves as... features... boasts" | "is... has" |
D. Formatting by rule
| # | Pattern | Before | After |
|---|---|---|---|
| 19 | Bold as decoration | "OKRs, KPIs"; "Performance: Performance improved" | Remove the bold; turn a labeled list into prose |
| 20 | Decorative headings | "Strategic Negotiations And Partnerships", "🚀 Launch Phase:" | Sentence case; remove emojis and arrows |
| 21 | Curly quotation marks (weak alone) | said “the project” |
said "the project" |
E. Leftovers from the chat and the draft
| # | Pattern | Before | After |
|---|---|---|---|
| 22 | Chatbot residue | "Great question! ... I hope this helps!" | Remove the wrapper and keep the content |
| 23 | Knowledge-limit disclaimers and guesses | "While details are limited in available sources, it appears..." | State what the source shows, or remove the sentence |
| 24 | A heading repeated in the first sentence | "## Performance" + "Speed matters." | Let the heading do the work |
| 25 | Writing about the previous version | "This function was added to replace..." | Describe what it does now |
Full example
The writer supplied these notes with the draft, so the rewrite can use them: the trip was last October, the hotel was in Alfama, the custard tart was at a small place in Graça, the tram ride took about forty minutes. Without notes like these, Humanizer asks instead of inventing.
Before (AI-sounding):
I recently spent five unforgettable days in Lisbon, and let me tell you — this city completely stole my heart. From the moment I arrived, I knew I was somewhere truly special.
Nestled along the banks of the Tagus River, Lisbon stands as a vibrant testament to Portugal's enduring spirit, where rich history and modern energy intertwine at every turn. Yes, the famous hills are challenging — my legs certainly felt it! — but every climb rewards you with breathtaking, panoramic views that make it all worthwhile.
No trip would be complete without riding the iconic Tram 28, winding through the city's most historic neighborhoods. And the food? Simply divine. The original pastéis de nata at Pastéis de Belém are a beloved national treasure, and savoring one still warm was a moment I will never forget.
But what truly makes Lisbon special isn't just the sights — it's the feeling. Wander a few steps off the main squares and you'll discover a quieter, more authentic side: sun-drenched alleys, charming tiled facades, and friendly locals going about their daily lives, inviting you to slow down and savor every moment.
Of course, the must-see São Jorge Castle offers stunning views over the rooftops below. The queues can be long, but the experience is absolutely worth it for an