Learn Jev
System One in plain English. Meet Choice, Score, and Noul, then jump to gateway wiring, MCP patterns, and real directory examples.
choice
Pick one label from a list. You get choice, probabilities, and confidence.
score
Rate state on a rubric. You get score, probabilities, confidence.
noul
Is this statement true? You get a noul value from 0 to 1.
Guides
Jev & TypeSafe
What Jev is, how System One fits your stack, and where this directory ends and TypeSafe docs begin.
System One model
The model family behind Jev: parallel typed questions, one forward pass, probabilities you can threshold.
Jev vs LLM classification
When to gate with System One probabilities instead of asking a chat model to label things.
Vercel AI Gateway Jev
Try typesafe-ai/jev through Vercel's gateway and the AI SDK evaluate path.
Jev use cases
The patterns builders actually search for: moderation, routing, triage, RAG verify, and agent gates.