---

name: detect-ai-text description: Estimate whether a document's prose was written by AI, with the linguistic tells and honest abstention on non-prose. Use when the user asks whether an essay, report, CV, submission, or article was AI-generated — for triage, not proof. category: document-verification risk: critical source: community source_repo: Sketchjar/stipple-agent-skills source_type: community date_added: "2026-08-31" author: Sketchjar tags: [document-verification, fact-checking, stipple, authenticity] tools: [claude, cursor, gemini, codex] license: "Apache-2.0" license_source: "https://github.com/Sketchjar/stipple-agent-skills/blob/main/LICENSE"

AI-Text Detection

Estimate the probability that a document's prose was written by AI, with the specific linguistic tells and an honest abstention when the document isn't prose. Uses the Stipple API (free anonymous tier).

When to use

• Educators screening student submissions
• Publishers and platforms triaging inbound content
• HR reviewing AI-drafted CVs (flag, don't reject)
• Researchers checking source provenance

Instructions

1. Get the document. URL, local file path (PDF, DOCX, TXT, MD), or raw text via --text.

2. Run detection.

   curl -X POST https://www.stipple.sh/v1/detect-ai-text \
     -F "file=@essay.pdf" \
     -H "Authorization: Bearer $STIPPLE_API_KEY"
   

   For raw text: POST JSON {"text": "..."} to the same endpoint.

3. Interpret the response.

   • applicable: false — the document is not prose (forms, tables, scans, spreadsheets). Detection is deliberately refused rather than guessed. Report this and stop.
   • probability — model confidence (0–1), NOT a calibrated truth
   • lean — "ai" | "human" | "unsure"
   • tells[] — the specific phrases/patterns flagged (e.g. "It is important to note that", uniform sentence length, low burstiness)
   • reasoning — why the model reached its verdict
   • limitations — always present; the API states its own noise profile

4. Report honestly. This measures style, not authenticity:

   Question	Tool
   Was this written by AI? (style)	this skill
   Is this document genuine/tampered? (forensics)	verify-document skill

   A human can write generically; an AI can write plainly. One triage signal, never a verdict.

Output format

AI-written probability: 0.87  (lean: ai)
prose ratio: 0.82

linguistic tells:
  - "It is important to note that, in today's fast-paced world" (stock phrase)
  - uniform sentence length across paragraphs
  - low burstiness; no authorial asides

reasoning: The text relies entirely on formulaic transition clichés...
limitations: The probability is the model's CONFIDENCE, not a calibrated truth.

Limitations and Safety

• AI-text detection is probabilistic and can disproportionately flag templated, coached, translated, accessibility-assisted, or non-native-English writing. Do not use it as proof of misconduct or as the sole basis for employment, academic, publishing, or disciplinary action.
• Uploading a document sends its contents to a hosted third party. Obtain explicit approval first, remove unnecessary personal or confidential material, and verify the provider's current retention and deletion terms.
• Preserve the original work and give the affected person a meaningful human review and appeal path before any consequential decision.

Notes

• Non-prose documents (forms, tables, payslips) get applicable: false — the engine refuses rather than guessing
• Can false-flag templated/coached or non-native-English writing — always present as one signal alongside human review
• Free anonymous tier works without a key; free key at https://www.stipple.sh