Detect AI-generated text in documents and submissions

This skill estimates the probability that a document's prose was written by AI, using the Stipple API (free anonymous tier). It returns a probability (0-1, a confidence score, not a calibrated truth), a lean of "ai", "human", or "unsure", specific linguistic tells such as stock phrases, uniform sentence length, or low burstiness, the model's reasoning, and its own stated limitations. When the document isn't prose at all - a form, table, scan, or spreadsheet - it returns applicable:false and deliberately refuses to guess rather than forcing a verdict.

Use it for educators screening student submissions, publishers or platforms triaging inbound content, HR reviewing AI-drafted CVs to flag rather than reject, or researchers checking source provenance. This measures style, not authenticity - to check whether a document itself is genuine or tampered with, use the verify-document skill instead. Never use the probability as proof of misconduct or as the sole basis for an employment, academic, publishing, or disciplinary decision, since it can disproportionately flag templated, coached, translated, accessibility-assisted, or non-native-English writing.

Input is a document supplied by URL, local file path (PDF, DOCX, TXT, MD), or raw text. Detection runs as:

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

Output is a report combining the probability, lean, flagged tells, reasoning, and limitations described above - for example, an 0.87 AI-written probability with lean "ai", a prose ratio, a short list of tells such as a stock transition phrase or uniform sentence length, and a reasoning line summarizing why the model reached that verdict. This is one triage signal, never a verdict on its own: a human can write generically, and an AI can write plainly.

The Stipple API, available on a free anonymous tier or with a free key from stipple.sh, performs the detection. Uploading a document sends its contents to that hosted third party, so explicit approval, removal of unnecessary personal or confidential material, and a check of the provider's current retention and deletion terms are expected before use. The free anonymous tier works without any key at all; a free key is available directly from stipple.sh for higher usage.

Educators, publishers, HR reviewers, and researchers who need a defensible, honestly-caveated triage signal on AI authorship, always paired with a meaningful human review and appeal path before any consequential decision.