Jev-kit for Claude Code

Cadaverr’s Jev-kit integrates TypeSafe’s Jev model into Claude Code for tasks including tool-call guarding, sub-agent sizing, file search, and browser automation. Jev answers pick-one and yes/no questions in about 0.3s, according to the author.

Open source timeabout 0.3s

Cadaverr in r/ClaudeCode@Cadaverr

Jev-kit: all the Jev stuff I've wired into Claude Code, now in one repo (guard hook, sub-agent sizing, file search, browser agent) I've been using TypeSafe's Jev with Claude Code for a couple of days and kept adding more use cases/ideas. So I've cleaned it up and put it in one repo. For anyone who doesn't know Jev; Jev is a small fast model that answers pick-one and yes/no questions (and more) in about 0.3s, which makes it cheap so you can put it inside your agents loop and make calls Claude would otherwise spend a turn on (eating away our already limited weekly usage). What's in it: A PreToolUse guard. Plain code checks let about 93% of tool calls straight through in ~33ms, the grey ones get one question to Jev. Catches stuff like cat on an env file or a find across the whole disk Sub-ag

Sep 23, 2026Reddit postsView on Reddit

The PreToolUse guard lets about 93% of tool calls pass through plain-code checks in about 33ms and sends ambiguous cases to Jev. The author says it can catch cases such as reading an env file with `cat` or searching the whole disk with `find`.

Also filed under Agents & browsers

Jev Browser Automation
jev-browser takes a task and URL, then uses Jev to choose one action per step from the page’s clickable, typeable, and selectable elements. It scores whether the goal is met or the run is stuck.
Jev Gates Agent Memory Saves
The author used Jev to check whether proposed agent memories were supported by the original conversation and guide whether to save, skip, or defer them. On 100 synthetic cases at a .40 cutoff, Jev kept 39 of 50 memories labeled worth keeping and saved no candidates labeled skip or defer; its median gate latency was 250 ms.