What it is
A Claude Code plugin for people with dozens of skills installed. A UserPromptSubmit hook asks TypeSafe Jev which skill fits the prompt, logs the answer, and by default injects nothing. Experimental; the README says it is unlikely to help a strong model as a router.
How it uses Jev
Jev answers typed questions with probabilities. Step 1 ranks the whole roster by name and full description and asks three yes/no questions about the prompt; if their mean is under 0.30 the hook stops. Step 2 sends the top three with their SKILL.md bodies, picks one, and asks one fit question per candidate; under 0.30 suggests nothing.
Primitives:choicescore
Technique worth stealing
Two-stage gate then narrow: cheap wide ranking plus yes/no gates, then a shortlist with full skill bodies.
Try it
/plugin marketplace add shimo4228/jev-skill-router then /plugin install jev-skill-router@jev-skill-router
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 patternyes0.89
- Handles uncertaintyyes0.87
- Measuredno0.09
- Runnableyes0.96
- Worth recommendingunclear0.53
- Model replicano0.03
- Problem scopescore on a 0–2 scale0.95
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 21 Sept 2026.