What it is
JevLoop is a runnable agent harness in TypeScript for developers who want the loop's judgements answered without a generation. It ships the loop, backend seams, accounting and a web UI, with zero dependencies and no build step.
How it uses Jev
Jev answers the loop's own forks: a Choice picks the next tool from candidates rebuilt each step, a Score grades the call's risk, and a Noul decides whether authorisation is needed. Plain code acts on the answers, so a high risk score forces human authorisation that no probability can override.
Primitives:choicescorenoul
Technique worth stealing
Compile DECISION.md into the questions the decision model is asked, keeping only the state frame in code.
Try it
npm run demo
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-centricyes0.92
- Shows a System One patternyes0.97
- Handles uncertaintyunclear0.57
- Measuredyes0.88
- Runnableyes0.85
- Worth recommendingyes0.69
- Model replicano0.07
- Problem scopescore on a 0–2 scale1.60
- About Jevyes0.92
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 22 Sept 2026.