Codex CLI plugin
Install the Codex Humanizer Skill With One Command
Agentic Humanizer is a free, open-source skill that has Codex rewrite AI-generated text in five passes, in your own voice if you hand it a sample. Add the marketplace, install the plugin, and type /agentic-humanizer.
Add the marketplace in your terminal
codex plugin marketplace add numen-tech/slopornot- Start codex and open /plugins.
- Switch to the slopornot marketplace.
- Choose Install plugin.
- Free and open source
- MIT-licensed on GitHub. There is no account to create and no humanizer subscription to pay for.
- Five rewrite passes
- Each pass changes something different: AI-writing patterns, tone, reading level, targeted edits, and, if the draft still reads generated, its structure.
- Slop or Not is optional
- The rewrite works without it. Add Slop or Not on a Mac with Pro and every pass gets an on-device score.
Run
How Do You Use the Humanizer Skill in Codex?
Type the command and paste your draft. Before it changes a word, the skill asks four things: language and variant, reading level, tone, and how far the length may drift. Codex takes at most three questions per prompt, so they arrive in two short rounds, and you can save the answers as your defaults.
/agentic-humanizer
[paste your AI-generated text here]To make the rewrite sound like you, save 200 or more words of your own writing to ~/.agentic-humanizer/voice.txt, or answer yes when the skill offers to match a writing sample. It reads rhythm, register, contractions, and phrasing from the sample, shows you what it found, and uses that only after you approve it.
No plugins?
Copy the Skill Into ~/.codex/skills Instead
A Codex build without plugin support can load the skill folder directly. Clone the repository once, copy both skill folders, then restart Codex so it finds them. The copy also installs slop-check, the companion skill for one-shot checks on your Mac.
git clone https://github.com/numen-tech/slopornot /tmp/slopornot
rm -rf ~/.codex/skills/agentic-humanizer ~/.codex/skills/slop-check && \
mkdir -p ~/.codex/skills && \
cp -R /tmp/slopornot/skills/agentic-humanizer ~/.codex/skills/ && \
cp -R /tmp/slopornot/skills/slop-check ~/.codex/skills/Reference
Commands and Inline Flags
Put flags on the same line as the command and the skill skips the questions they answer. The profile commands read or clear what it saved under ~/.agentic-humanizer/.
| Flag or command | What it does |
|---|---|
language=<code> | Sets the target language, for example language=de. Without a variant, that language's default variant applies. |
variant=<spec> | Sets the variant, for example variant=de-AT. |
dialect=us | dialect=uk | Shorthand for American or British English. |
grade=N | Targets a Flesch-Kincaid grade. English only. |
level=<band> | Targets a reading-level band in any supported language, from elementary to graduate. |
tone=casual | professional | academic | Sets the tone of the rewrite. |
length=±10 | exp | trim | Keeps the length within 10 percent, lets it grow, or lets it shrink. |
threshold=N | Changes the AI-score target. Needs Slop or Not Pro. |
max=N | Changes the cap on measured passes. Needs Slop or Not Pro. |
voice=/path/to/file.txt | Matches this writing sample for one call. |
voice=off | voice-skip | Skips voice matching for one call. |
skip-interview | Skips the questions and uses your saved profile, or the defaults for the detected language. |
show profile | Prints your saved preferences. |
reset | Deletes your saved preferences. |
show voice | Prints the saved voice fingerprint and the path of your sample. |
reset voice | Deletes the saved voice sample and fingerprint. Your rewrite preferences stay. |
Example
What Does a Rewrite Look Like?
The before text opens the skill's own test fixture, and it trips almost every pattern the first pass hunts for: a stock opener, stacked buzzwords, and a sentence that promises everything and names nothing.
In today's rapidly evolving landscape, leveraging cutting-edge AI solutions has become not just a luxury but a necessity. Organizations across industries are increasingly turning to artificial intelligence to streamline operations, enhance productivity, and unlock new opportunities. By embracing the transformative potential of AI, businesses can navigate the complexities of the modern world and position themselves for long-term success.Plenty of companies now use AI somewhere, usually for the dull parts of a job: sorting support tickets, drafting first replies, summarizing long threads. The ones getting real value started small. They picked one task they could measure and checked the output by hand for a few weeks before trusting it.The after text is an illustrative rewrite, not captured output. Your result depends on your answers, your voice sample, and the model your agent runs.
Optional
Want a Score for Every Pass?
Install Slop or Not on a Mac with Apple silicon, turn on Pro, and the skill starts measuring. It strips hidden characters from the source, scores each pass with the on-device AI text detection model, checks the reading grade against your target, and cleans the final text again. The AI score reads English; other supported languages converge on readability instead. Detection runs on your Mac, and the rewriting still happens in your agent.
Frequently Asked Questions
Is the Codex humanizer skill free?
Yes. Agentic Humanizer is MIT-licensed and free on GitHub. Codex does the rewriting, so it runs on the Codex access you already have.
Do I need Slop or Not to use it?
No. The five-pass rewrite and voice matching run without it, and the loop history shows n/a where scores would go. Slop or Not on a Mac with Pro adds an on-device AI score, readability, and Text Cleanup to every pass.
Where does my text go?
The skill is a set of instructions, not a hosted service, so it adds no upload of its own. Your draft goes wherever Codex already sends your prompts. With Slop or Not installed, the scoring and cleanup run on your Mac.
Will the rewrite pass every AI detector?
Nobody can promise that, and we don't. AI detectors are probabilistic and they disagree with each other. The skill removes common AI-writing patterns and moves the draft toward your voice. Read the result yourself before you use it.
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