What it is
Starter examples for developers trying TypeSafe's Jev System One model. Includes a ticket-triage example and a re-ranking example, each with sample data and a Makefile, runnable through OpenRouter without an early-access key.
How it uses Jev
In 01, one ticket is state; seven named questions (department Choice, business_impact Score, threatens_churn Noul, etc.) are sent in a single parallel request, and the typed answers drive a routing policy written in code. In 02, each (question, article) pair is its own state with one Noul; calls fan out concurrently and the returned probability is the sort key.
Primitives:choicescorenoul
Technique worth stealing
Pick the primitive by what the answer means, and keep policy thresholds in code rather than in the model.
Try it
git clone, make setup, cp .env.example .env with an OpenRouter key, then make test and make run.
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-centricyes0.95
- Shows a System One patternyes0.61
- Handles uncertaintyno0.04
- Measuredno0.22
- Runnableyes0.62
- Worth recommendingyes0.66
- Model replicano0.03
- Problem scopescore on a 0–2 scale1.02
- About Jevyes0.99
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.