Jev Companion

Jev Companion is an independent, unofficial guide, setup assistant and console for Jev, TypeSafe AI's System One decision model. It is not affiliated with, endorsed by, or sponsored by TypeSafe AI. Jev is not a chatbot. You send it state plus typed questions, and it returns typed values, full probability distributions, and a confidence you can branch on. This app takes you from never having heard of it to making your own calls. LEARN • What Jev is, and where it fits next to a large language model • Choice, Score and Noul — the core decision types; experimental Box in Image Lab • Confidence and thresholds: the second decision axis • Patterns that work: fan-out, confidence-gated routing, composite scoring, intent routing, cascades • The nine documented failure modes, and how to design around them SET UP • Get an API key and keep it out of your code • First calls in raw HTTP, Python and…