jev-rs

What it is

System One judgments from any LLM, in one prefill. A Rust engine that answers typed questions about a piece of state — noul (yes/no), choice (one of N), score (ordered scale) — with probabilities, never generated text. Wire-compatible with TypeSafe's Jev POST /v1/systemone, and exposed to coding agents as an MCP tool.

Getting started

From the README:

curl -fsSL https://raw.githubusercontent.com/yijunyu/jev-rs/main/install.sh | sh

Where the decision sits

jev-rs calls the hosted decision API rather than running its own weights. That keeps the project small and means its behaviour moves whenever the vendor ships a new model version. It also means an API key and a network round trip sit in the path of every decision.

Models it references: Jev, agent-jev, laya.

How active it is

Created 2026-09-21, last pushed 2026-09-28, 21 stars and 4 forks when we read it on 2026-11-02. Everything in this category is weeks old at most, so a stale push date means something different here than it would on a mature project. Check the repository before you depend on it.