Agent skill

AI Index

Method and tooling for measuring how AI-generated a piece of prose reads, in Japanese or English.

No licenceAuto-check passedBusiness, Finance & HR

Install AI Index

skills CLI

$ npx skills add mizchi/skills --skill ai-index -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install mizchi/skills ai-index --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/ai-index .claude/skills/ai-index && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "ai-index" agent skill from https://github.com/mizchi/skills/tree/main/ai-index into .claude/skills/ai-index/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ai-index", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/mizchi/skills/tree/main/ai-index

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add mizchi/skills --skill ai-index -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install mizchi/skills ai-index --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/ai-index .agents/skills/ai-index && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "ai-index" agent skill from https://github.com/mizchi/skills/tree/main/ai-index into .agents/skills/ai-index/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ai-index", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add mizchi/skills --skill ai-index -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install mizchi/skills ai-index --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/ai-index .cursor/skills/ai-index && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "ai-index" agent skill from https://github.com/mizchi/skills/tree/main/ai-index into .cursor/skills/ai-index/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ai-index", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/mizchi/skills.git --path ai-index

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add mizchi/skills --skill ai-index -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install mizchi/skills ai-index --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/ai-index .gemini/skills/ai-index && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "ai-index" agent skill from https://github.com/mizchi/skills/tree/main/ai-index into .gemini/skills/ai-index/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ai-index", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install mizchi/skills ai-index

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add mizchi/skills --skill ai-index -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/ai-index .github/skills/ai-index && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "ai-index" agent skill from https://github.com/mizchi/skills/tree/main/ai-index into .github/skills/ai-index/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ai-index", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add mizchi/skills --skill ai-index -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install mizchi/skills ai-index --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/ai-index .opencode/skills/ai-index && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "ai-index" agent skill from https://github.com/mizchi/skills/tree/main/ai-index into .opencode/skills/ai-index/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ai-index", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: ai-index
GitHub stars: 360
Token cost: ~3.6k tokens
SKILL.md length: 1,934 words
Files: 35 (incl. scripts, references)
Skills in repo: 69
Repo updated: Oct 2, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Method and tooling for measuring how AI-generated a piece of prose reads, in Japanese or English.

Works in 6 steps: The two layers → Layer A — run the lint → Why Layer A cannot be the score → …
Calibrating an AI-likeness score
SKILL.md covers When to use, 1. The two layers, 2. Layer A — run the lint and 3. Why Layer A cannot be the…, plus 6 more sections
Runs Python scripts from its folder; calls python3

What it does

AI Index is an agent skill from mizchi/skills. Method and tooling for measuring how AI-generated a piece of prose reads, in Japanese or English. Two layers — a deterministic lint for removable surface tells (scripts/slopscore.py, no API) and a judgment layer of typed probabilistic questions (Jev noul/score) for the tells that survive editing. Includes measured human/AI baselines, a gap-first calibration procedure, and labeled fixtures. Use when building or calibrating an AI-likeness score, or when a draft needs a defensible number rather than a vibe. For…

Its SKILL.md is about 3.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 40 other files, including scripts and reference files (for example `README.md`, `examples/README.md` and `examples/judgment-layer/aggregate.py`).

It sits in Business, Finance & HR, covering Humanizing AI text, Performance reviews and Linting and formatting. The repository describes itself as: Agent skills by mizchi, distributed via APM.

When your agent uses it

Calibrating an AI-likeness score
A draft needs a defensible number rather than a vibe

Example prompts

“/ai-index”

Requirements

Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

The two layers
Layer A — run the lint
Why Layer A cannot be the score
Gap-first calibration (do this before tuning any threshold)
Layer B — the judgment layer
Reporting

What it can do on your machine

Read from SKILL.md and the folder at commit 62f5808. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python, from the files we listed), which the agent can run.
Shell commands in SKILL.md call:
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- github.com
- gist.github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

AI Index loads about 3.6k tokens when it runs, and up to ~11k if it reads all its reference files. Until then it costs about 148 tokens; SKILL.md has 1,934 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~148
When it runs · the whole SKILL.md, loaded when a task matches: ~3.6k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~11k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,934 words (~3,579 tokens).

“A measurement skill: given a text, produce a defensible number for "how AI does this read", and know what that number is worth.”

— opening of SKILL.md by mizchi

name: ai-index

Read the full SKILL.md on GitHub

Files

SKILL.md and 34 other files (scripts, references) in ai-index of mizchi/skills.

SKILL.md
README.md
examples/README.md
examples/judgment-layer/aggregate.py
examples/judgment-layer/compare-axes.py
examples/judgment-layer/judge-key.json
examples/judgment-layer/judge-scores-jevslop.json
examples/judgment-layer/judge-scores.json
examples/reader-runs/run-01/keen/log.jsonl
examples/reader-runs/run-01/keen/state.json
examples/reader-runs/run-01/report.md
examples/reader-runs/run-01/room-annotations.json
examples/reader-runs/run-01/skeptic/log.jsonl
examples/reader-runs/run-01/skeptic/state.json
examples/reader-runs/run-01/skim.txt
… and 20 more

Open the folder on GitHubat commit 62f5808

Compare with similar skills

AI Index next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

AI Index compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
AI Index this skillmizchi/skills	360	—	~3.6k	Automated safety check: Pass	None	9 days ago
Prism Maintainirfndi/prism-liquidity-agent	124	—	~1k	Automated safety check: Pass	MIT	13 days ago
Gatingoaustegard/claude-skills	150	—	~3.1k	Automated safety check: Pass	MIT	yesterday
Humanizeaashaexo/soundshuman	298	1 repos	~6.9k	Automated safety check: Pass	MIT	2 mo ago
Authoring Skillsfriday-platform/friday-studio	104	—	~2.4k	Automated safety check: Pass	Custom licence	1 mo ago
Ensure Qualitygambitph/Stackable	351	—	~1.5k	Automated safety check: Pass	GPL-3.0	4 days ago

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Questions about AI Index

What does AI Index do?

Method and tooling for measuring how AI-generated a piece of prose reads, in Japanese or English. AI Index is an agent skill from mizchi/skills. Method and tooling for measuring how AI-generated a piece of prose reads, in Japanese or English.

When should I use AI Index?

AI Index fits situations like: calibrating an AI-likeness score; A draft needs a defensible number rather than a vibe.

How do I install AI Index in Claude Code?

Run `npx skills add mizchi/skills --skill ai-index -a claude-code`. Or copy the skill folder (ai-index in mizchi/skills) into .claude/skills/ai-index in your project. Claude Code loads it when a task matches its description.

How do I install AI Index in Codex?

Run `npx skills add mizchi/skills --skill ai-index -a codex`. Or copy the skill folder (ai-index in mizchi/skills) into .agents/skills/ai-index in your project. Codex loads it when a task matches its description.

Can I use AI Index in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mizchi/skills --skill ai-index -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ai-index, .gemini/skills/ai-index, .github/skills/ai-index and .opencode/skills/ai-index in your project.

What does AI Index need to run?

Going by SKILL.md and its folder, AI Index needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does AI Index access the network?

SKILL.md names 2 domains. As links in the text: github.com and gist.github.com. This is read from the text; nothing was executed.

Is AI Index safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does AI Index use?

No licence was found for AI Index or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does AI Index use?

About 3.6k tokens (SKILL.md is roughly 14k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.2k tokens, read only when the agent opens those files.

What are the alternatives to AI Index?

Skills that share tags, products or a category with AI Index: Prism Maintain (irfndi/prism-liquidity-agent, 124 stars), Gating (oaustegard/claude-skills, 150 stars), Humanize (aashaexo/soundshuman, 298 stars) and Authoring Skills (friday-platform/friday-studio, 104 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains AI Index?

mizchi (a GitHub user) maintains it in mizchi/skills, which has 360 GitHub stars. The repository holds 69 skills in this directory. The repository was last updated on October 2, 2026.

Source: mizchi/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

AI Index

Install AI Index

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

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Gating

Humanize

Authoring Skills

Ensure Quality

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Questions about AI Index

Install AI Index

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from mizchi/skills

Related

Questions about AI Index