What it is
jevcore gives agents a typed judgment surface: Jev answers noul, choice, and score questions with calibrated probabilities instead of prose. It ships as a plain Node library, a DeepSeek Harness plugin, and an MCP stdio server.
How it uses Jev
Jev answers typed questions (noul, choice, score) over a supplied state and returns calibrated probabilities. The plugin exposes three tools and two opt-in gates: gates.safety judges tool calls before dispatch, gates.context withholds large uninformative state. Results below minConfidence or minProbability are not acted on; undecided defaults to ask.
Primitives:choicescorenoul
Technique worth stealing
Per-feature egress contract: every feature defaults off, each transmission is named in a startup log line, and disabled gates register no listeners.
Try it
npx -y jevcore-mcp, or dsh plugin --profile add the packages/dsh path.
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.95
- Shows a System One patternno0.31
- Handles uncertaintyno0.06
- Measuredno0.05
- Runnableyes0.87
- Worth recommendingunclear0.40
- Model replicano0.24
- Problem scopescore on a 0–2 scale1.04
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.