9 open-source Jev use cases: from skill routing to semantic grep
The list covers jev-opus dynamically setting reasoning effort, jev-belay blocking false completion, jev-commit validating commit messages, jegrep semantic search, and more.
Jev is quietly eating the agent stack. Got a Jev API key and no idea what to build first? Steal this checklist: 1. jev-opus Runs Claude Code on Opus 5.5 and asks Jev before every call how much effort the next step needs: low, medium or high. Code holds the floors and ceilings, and the prompt cache stays intact. https://github.com/WXK-AI/jev-opus 2. jev-belay A Claude Code Stop hook that doesn't believe "done" without proof. If files changed and nothing passed since, one Jev call reads the transcript before the agent is allowed to stop. https://github.com/valentynkit/jev-belay 3. jev-skill-router On every prompt, Jev picks one skill from everything you have installed, or none. It starts in shadow mode and only logs, so you see its picks before you trust them. https://github.com/shimo4228/jev-skill-router 4. codex-jev-router Jev chooses the model and reasoning effort for each Codex subagent. When Jev isn't sure, it falls back to Sol. https://github.com/suenot/codex-jev-router 5. jev-commit A pre-commit hook. One Jev call checks whether your commit message actually matches the staged diff, and flags debug leftovers and unmentioned work. https://github.com/valentynkit/jev-commit 6. is-malicious Scans source, config, build and CI files with Jev and points at the suspicious lines before any of it runs. https://github.com/luantak/is-malicious 7. jegrep Semantic grep in Rust. Jev scores your files with probabilities, no embedding index and no background daemon. https://github.com/can1357/jegrep 8. jev-scout An MCP server that scores every search query, result and fetched page your agent touches for relevance and credibility, with a live decision dashboard. https://github.com/kierandotai/jev-scout 9. hunch Probabilistic control flow for Ruby. if Hunch.likely?("fraudulent", given: order) branches on a typed Jev answer. https://github.com/carldaws/hunch 10. pytest-jev Write plain-English claims about your output, and the test only passes when Jev clears every claim above 0.8. https://github.com/allebee/pytest-jev Fork any of these Jev builds, then save the full Jev setup below ↓
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