What it is
A browser extension that reads the YouTube caption track and scores each segment's sponsor probability on the seek bar before the intro ends, for viewers of videos nobody has labeled yet.
How it uses Jev
The background worker sends the transcript once and one question per 30-second segment, asking Jev to classify each as content, sponsor, intro, outro, self_promo, recap, or other. Answers paint the seek bar as they arrive, one hue per category with colour strength from the probability, and arm one timer for the next segment over your threshold.
Primitives:choice
Technique worth stealing
Re-ask for the caption URL the player signs for itself as json3, since the unsigned URL returns 200 with an empty body.
Try it
npm install && npm run build, load dist/chrome-mv3 unpacked, paste your TypeSafe key in the popup.
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.77
- Shows a System One patternunclear0.53
- Handles uncertaintyno0.07
- Measuredyes0.97
- Runnableyes0.97
- Worth recommendingunclear0.40
- Model replicano0.08
- Problem scopescore on a 0–2 scale0.90
- About Jevyes0.97
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.