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AI-Check (AI Writing Forensics)

Scores any text across nine AI-tell signal categories and returns a structured report with quoted evidence and concrete fixes.

Content & WritingIntermediate★ 351⑂ 40AI score 9/10Last updated: Jul 10, 2026

What it does

Gives you a forensic breakdown instead of a vague "this feels like AI" answer. Each of nine signal categories is scored 0–3: perplexity/vocabulary safety, burstiness deficit, hedge density, structural tells, specificity deficit, transition fingerprint, punctuation fingerprint, voice & register, and rhetorical scaffolding.

  • Total score 0–27 mapped to a verdict (Human → AI) plus a confidence level
  • A separate AI-edited fraction estimate for the common mixed-authorship case
  • An evidence log where every fired signal must cite an exact quote
  • Recommended rewrites for the top three signals when the score exceeds 6
  • Calibration rules for short texts, academic/legal registers, ESL writers, paraphrased text, and known detector blind spots

It catches subtle patterns most checkers miss: em-dash pivots, "turns out" reveals, mini-aphorism closers, tricolon parallels, and "register collapse" in Slack-style messages.

Who it's for

  • Writers self-editing blog posts, newsletters, or LinkedIn drafts before publishing
  • Marketers and editors humanizing AI first drafts
  • Professionals checking that emails, cover letters, and proposals don't read as machine-made
  • Educators who need concrete examples of AI writing tells

Examples

  1. "Run ai-check on this draft" → report flags Signal G (four em dashes in 600 words) and Signal I (chiasmus closer); you fix just those two spots.
  2. Paste a Slack status update → skill detects register collapse: lmk and ~60% on top of perfectly formed sentences, and suggests fragmenting the prose.
  3. Review a client email → templated closer "Let me know if you have any questions" plus reflexive hedging get replaced with one specific ask.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/harshaneel/humanize/HEAD/ai-check/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the ai-check folder from the GitHub repo harshaneel/humanize into my ~/.claude/skills/ai-check/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/harshaneel/humanize.git && mkdir -p ~/.claude/skills && cp -r humanize/ai-check ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open your terminal.
  2. Clone the repository: git clone https://github.com/harshaneel/humanize.git
  3. Create the skills directory if needed: mkdir -p ~/.claude/skills
  4. Copy the skill folder: cp -r humanize/ai-check ~/.claude/skills/
  5. Verify it landed: ls ~/.claude/skills/ai-check should show SKILL.md.
  6. Restart Claude Code, then ask something like "does this paragraph sound AI-written?" to trigger the skill.
  7. (Optional) To install every skill in the repo: cp -r humanize/* ~/.claude/skills/.
View source on GitHub ↗License: MIT