What it is
An unofficial curated list of use cases, projects, SDKs, tools, and learning resources for Jev, TypeSafe AI's System One model for typed decisions inside software. It helps developers explore the early ecosystem.
How it uses Jev
Jev is the subject of the list, not a component. The README shows Jev usage examples for classifying support tickets, checking urgency, and scoring frustration using Choice, Noul, and Score questions against a state; code branches on returned typed answers and probabilities.
Primitives:choicescorenoul
Technique worth stealing
Use Jev for typed decisions instead of parsing LLM text; pair it with an LLM when free-form writing is needed.
Try it
Install typesafe-sdk or @typesafe-ai/sdk and call system_one/systemOne with a state and typed questions.
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-centricunclear0.52
- Shows a System One patternno0.14
- Handles uncertaintyno0.04
- Measuredno0.09
- Runnableno0.27
- Worth recommendingno0.18
- Model replicano0.04
- Problem scopescore on a 0–2 scale1.07
- About Jevyes0.93
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.