Open· Last updated 2026-09-21

How Jev decides

Jev “decides” only in the narrow sense TypeSafe documents: it evaluates each question against the state and returns typed values. Your policy decides what the product does next.

Unofficial loop description. Official primitives: docs.typesafe.ai/primitives. No keys.

Independent angle (cover, do not clone)

Win delta (what-is-jev / state+questions): schema-first loop + dual snippets + caveats; we do not photocopy TypeSafe’s mermaid.

The loop

1. Filter state — named fields, no warehouse dump (jaggedness: distractors).
2. Pick primitives — Choice (≤255 options), Score (2–10 levels), Noul (P(yes)).
3. Align instructions and criteria — contradictions confuse jev-1.13.
4. One POST — questions isolated and parallel; adding questions barely changes response time (vendor docs).
5. Code — threshold, combine weights, call tools, or abstain.
6. Trace — model, usage, full probabilities, action taken.

What you do not get

No chain-of-thought, no tool calls from Jev, no images. Question ids are for your code (primitives page: not sent to the underlying model) — write the whole question in instructions.

# Combine in code — official composite-scoring idea.
fit = level_to_n[ans.answers["fit"].score]
risk = ans.answers["risky"].noul
action = "review" if ans.answers["fit"].confidence < 0.55 else ("block" if risk > 0.8 else "pass")

const p = result.answers.intent.probabilities;
const margin = p[result.answers.intent.choice] - secondBest(p);
if (margin < 0.08) return "review";

Failure modes in the loop

If instructions and criteria disagree, jev-1.13 can get confused (official). If you ask the same thing as Noul and as yes/no Choice, the numbers need not match. If you need an identity, enforce it in code — do not average the two.

What this page does not claim

• No inner-architecture speculation.

FAQ

Are questions independent? Docs: evaluated independently on the same state. Do not assume P(A)+P(not A)=1 across questions.

What if I need generation? Another model, after this loop.

Disclaimer

This is an independent unofficial site and is not affiliated with TypeSafe AI; official documentation is available at https://docs.typesafe.ai. Never treat jev.pro as TypeSafe official documentation. We do not sell, issue, or proxy API keys.

Open-cluster pages are independent field-guide notes. Replicas and third-party interfaces mentioned anywhere on jev.pro are not Jev and not endorsed. Hub: Open. Siblings: what is jev, choice score noul, signals and actions. Canonical: https://docs.typesafe.ai.