How does the guard stay fast if it judges every call?

Airlock runs a rules table first and only sends the ambiguous fraction to Jev, with about 0.3 s per judgment through a warm daemon. Matching calls are allowed, warned, rewritten, or blocked.

Why put Jev in charge of browser clicks over Sonnet?

Jev reached the same browser goals as the large-model decider in the kit measurement while spending far less per run because it picks clicks and the language model only writes field text. Cells are small-sample directional.

What is the safe way to install and arm enforcement?

Install under $HOME with install.sh and no sudo, never printing the key, prove a deny with doctor.sh or a piped PreToolUse event, run in shadow, read the report, then switch the mode file to enforce.

What else runs besides the tool-call guard?

Tier guard checks dispatch rung, belay rechecks finished work, session check reports guard outages, file search stays local, and compaction is opt-in because it can send large tool histories per request.

How do I install jev-kit?

Clone to ~/code/jev-kit and run install/install.sh, which installs the guard, session check, daemon, monitoring, filesearch, claude-update and belay under $HOME; on native Windows without WSL use docs/INSTALL-WINDOWS.md, and --check-only prints the plan without installing.

Does jev-kit arm enforcement immediately?

No. The default is shadow mode, where the real rules table runs and the log records what enforce would have done; you read the log for a while, then write enforce into ~/.config/airlock/mode, and AIRLOCK_DISABLE=1 or a disabled file is a kill switch.

What percentage of tool calls does the jev-kit pre-filter let through?

A free code pre-filter lets about 93% of tool calls straight through and sends the ambiguous remainder to Jev, which answers in about 0.3 s; any error lets the call through, so the guard fails open.

CommunityJev Demos & Experiments

Jev Kit — jonathanavis96

Claude Code kit that guards PreToolUse calls with a free pre-filter plus one Jev question for ambiguous cases, and adds sub-agent sizing, rechecks, search, daemon speedups, and monitoring.

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Open github.com

Stars: 63
Language: Python
License: MIT
Published by: Community
Author: jonathanavis96
Last verified: Oct 2026

jonathanavis96/jev-kit

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Everything you need to run TypeSafe's Jev with Claude Code: a tool-call guard, tier guard, file search, browser agent, review, belay, compaction and installers.

Forks: 7
Last pushed: Updated Oct 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

Everything you need to run TypeSafe's Jev with Claude Code: guard your agent's tool calls, right-size its sub-agents, and wire Jev into search, browsing, review and more. Quickstart · What is in the kit · Browser result · How it works · Measured results · Safety · FAQ.

Quoted from the project's README. Read the full README.

Tagscommunity awesomejev catalog-import

Works forJev for Classification Jev for Moderation Jev for Tool calling

Used inJev for Software & DevTools

Languages: Python

Highlights

Airlock judge with code pre-filter, single typed Jev question, redacted summaries, and fail-open errors.
Warm daemon, file search, monitoring, installer, doctor, rollback, and tuning loop with exercised status per component.
Browser, review, classifier, log triage, and shim as opt-in uses with explicit data-exposure notes.
Shadow-first workflow with mode file, kill switch, pipeable deny proof, and never-print key handling.

Watch out

Needs a TYPESAFE_API_KEY stored at the kit path, defaults to shadow log-only mode until you enforce, and any judging error lets the call through. Copy reviewed against the repository README on 2026-10-04, not from running it.

Questions about this entry

Short answers drawn from the linked project or page.

Other listings of this project

Forks and copies of this project in the directory. This entry is the canonical one.

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