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Jev Suite

Four Java checkers (sponsored video, hiring fit, edit fidelity, and rental listings) that keep thresholds and vetoes in unit-tested code.
Stars
15
Language
Java
License
MIT
Reading time
3 min
Published by
Community
Author
klauswg
Last verified
Sep 2026

About this project

Four decision-quality tools built on Jev (TypeSafe System One), one shared kernel — Jev answers structured questions; deterministic code keeps the final say. Jev is a decision model that answers typed questions (score / choice / noul) over a state. Each app in this suite takes one real-world "did it actually happen as required?" problem, feeds Jev sanitized evidence, and keeps the thresholds, vetoes, and routing in plain Java.

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

Highlights

  • jev-proof, jev-fit, jev-fidelity, and jev-rental each ask one evidence question and leave the final say in Java.
  • A missing model degrades to review. No retrieved evidence fails the check closed.
  • Calibration runners exit 2 without an API key. --allow-mock watermarks the output.
  • The proof app's 60-sample note says 68 of 68 gated judgments correct, 12 designed abstentions, and 0 of 10 injection flips.
  • The rental app lists gated accuracy 0.910 against 0.854 raw on 178 claims.

Quickstart

bash
mvn package

Watch out

MIT. Needs JDK 17+ and Maven. jev-proof also needs yt-dlp. Sample sizes are the README's own calibrations, not an independent replay.

Questions about this entry

Short answers drawn from the linked project or page.

Reactions & coverage

Posts, threads, and videos about this entry from around the web.

Reddit: Localization QA with a decision model: meaning, terminology, and placeholders as separate checks.

Hacker News: Pick Verify: a single decision at the warehouse pick station catches confusable picks.

Show HN: Verifying robot picks with a decision modelRead the thread on Hacker News

From the Jev guides

Original write-ups on what this entry is for.

From the Jev AI model community

Posts from builders shipping with Jev right now.

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