What it is
A Pi coding agent extension that semantically routes tools and skills, and runs typed System One judgments using TypeSafe Jev. For developers using Pi who want fast, calibrated decisions without LLM overhead.
How it uses Jev
Jev evaluates tool usefulness probabilities, matches skills, and runs Choice/Noul/Score judgments on agent state. Results activate tools above JEV_THRESHOLD, suggest skills, or return typed verdicts used in code for routing and gating.
Primitives:choicescorenoul
Technique worth stealing
Use a single JEV_THRESHOLD constant across all routing paths to tune precision vs recall.
Try it
pi install npm:pi-jev, set TYPESAFE_API_KEY, then run /jev status.
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-centricyes0.79
- Shows a System One patternunclear0.57
- Handles uncertaintyno0.05
- Measuredno0.04
- Runnableyes0.65
- Worth recommendingunclear0.52
- Model replicano0.07
- Problem scopescore on a 0–2 scale1.05
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 21 Sept 2026.