What it is
A tool-call gate for Claude Code, Codex, Cursor and other AI coding agents. It answers allow, ask or deny in about 400 milliseconds for two hundredths of a cent, so every action can be checked instead of approving everything or nothing.
How it uses Jev
Jev answers two typed questions in parallel about the proposed tool call, returning a destructive probability and confidence. The gate compares these to thresholds to produce allow, ask or deny. Hard rules and a read-only allowlist run before Jev.
Primitives:score
Technique worth stealing
Hard rules run before the model, because the model was least reliable where a regex is easiest to write.
Try it
claude plugin marketplace add eugeniughelbur/jev-gate; claude plugin install jev-gate@jev-gate
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-centricyes0.89
- Shows a System One patternyes0.79
- Handles uncertaintyno0.13
- Measuredyes0.69
- Runnableyes0.93
- Worth recommendingno0.32
- Model replicano0.05
- Problem scopescore on a 0–2 scale1.74
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.