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Jev — haibt163

A reference app for Jev's typed primitives: three use cases — support routing, compare-and-choose and content triage — behind one server-side SDK boundary, with a developer view of every question, threshold and token count.

Stars
1
Language
TypeScript
Published by
Community
Author
haibt163
Last verified
Oct 2026

This is one of several Jev listings for the same project. The canonical entry is Jev — mayank953.

About this project

A TypeSafe System One playground: give Jev a messy real-world input and it turns it into fast, typed judgments that application code can use. Jev is TypeSafe's flagship System One model. It answers narrow, typed questions — Choice, Score, and Noul — with calibrated probabilities. It does not generate prose and it does not decide workflows. This playground demonstrates the division of labor: Jev judges; this application decides.

Quoted from the project's README. Read the full README.

Highlights

  • One SDK boundary in core; each use case declares its state builder, questions, normalization, thresholds and examples without importing the SDK.
  • Probability semantics stay typed: Choice returns a probability per option, Score a position on a rubric, Noul the probability of a yes/no condition.
  • Thresholds live in application rule files and are never model settings, and batch triage runs up to 20 items in parallel with per-item results.
  • The developer view shows the sent state, raw assessment, normalized judgment, request ID, latency and token usage, and the API key stays server-side.

Watch out

It is a demo instrument with no database, keeping nothing beyond session statistics in sessionStorage. Jev evaluates text only, its primary training language is English so other languages score lower, and the probabilities are calibrated across prediction groups rather than guaranteed for any single answer. Thresholds are the application's own values, so what looks like a model setting in the UI is code in rules.ts. The API key is read server-side at call time and never reaches the browser, but every use case still makes live hosted calls; only the test suite runs without credentials, against a mocked answer boundary. A few forwarder shims under src/lib/jev and src/components are marked do not import and left for a follow-up cleanup. Copy reviewed against the repository README on 2026-10-04, not from running it.

Questions about this entry

Short answers drawn from the linked project or page.

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