About

Unofficial field manual for TypeSafe System One / Jev.

Jev 101 is an unofficial learning hub for TypeSafe’s System One decision model (Jev) and nearby community tools.

We are not affiliated with TypeSafe. Content is paraphrased from public docs and independent tutorials, with sources linked.

What you will find

Quick Start: Playground → API/SDK → Choice · Noul · Score → confidence
Guides: parallel questions, Gateway, agent skill, Jev vs LLM, limits
Use-case outlines (not production recipes)
Ecosystem cards with an explicit OpenJev/SemIf boundary
FAQ

What you will not find

Bot-connect JSON feeds
One-click shared-bot install flows
Claims that community demos equal hosted Jev accuracy