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Typed yes/no, pick-one and score judgments from Jev in one batched call; typed escalation back.
About
Typed yes/no, pick-one and score judgments from Jev in one batched call; typed escalation back.
Security Report
Valid MCP server (1 strong, 0 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
6 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-shitianfang-jev-use": {
"args": [
"-y",
"jev-use"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
jev-use
English | 简体中文
The best way for Claude Code, Codex, and pi to work with Jev: hand the tasks that need no text output to Jev — faster steps, fewer tokens, tasks done sooner and better.
It makes the LLM and Jev true collaborators: when content needs to be written, the LLM takes over; when a step just needs a fast decision, Jev executes it.
Demos — real runs, 1× speed
Every demo is a rerunnable script in bench/examples/; all numbers, methodology, variance and caveats: bench/RESULTS.md · third-party measurements: docs/evidence.md.
Install
npx -y jev-use install # wires Claude Code, Codex, and pi — whichever it finds
Set one key in the environment your agent runs in (JEV_BACKEND=mock for
a keyless dry run):
| Provider | Env var |
|---|---|
| TypeSafe direct | TYPESAFE_API_KEY |
| OpenRouter | OPENROUTER_API_KEY |
| Vercel AI Gateway | AI_GATEWAY_API_KEY |
npx -y jev-use doctor checks the wiring. Judged state goes to the
provider you configure; JEV_BACKEND=mock stays local. Plugin form with
the routing skill and the PreToolUse gate:
harness/claude-code ·
harness/codex.
Use as a library
npm i jev-use — zero runtime dependencies on the judgment path:
import { Jev, check, pick, rate } from "jev-use";
const jev = new Jev();
const { answers } = await jev.judge(state, {
next: pick("Next action?", { merge: "all green", rerun: "looks flaky", hold: "needs attention" }),
risk: rate("How risky?", ["routine", "worth a look", "incident"]),
passed: check("Did the run fully succeed?"),
});
// answers.next → { answer: "merge", confidence: 0.93, confidenceFrom: "reported", escalate: false }
Anything Jev can't or shouldn't decide comes back with escalate: true
and a typed reason. Tools, verdict shape, escalation contract, CLI:
docs/reference.md.
Small enough to read
| File | Job |
|---|---|
| src/protocol.ts | Questions (check/pick/rate), verdicts, escalation reasons |
| src/dispatch.ts | Pre-call routing: what never reaches Jev |
| src/judge.ts | screen → backend → hand back what is unsure; gate |
| src/jev.ts | The Jev client over that engine |
| src/redact.ts | Credentials stripped from a gated action before it is sent |
| src/backends/ | TypeSafe, OpenRouter, Vercel, mock adapters |
| src/server.ts | The two MCP tools |
| src/cli.ts | install, serve, hook gate, doctor |
| skills/jev-use/SKILL.md | The routing rules the agent follows |
Development
$ npm run typecheck && npm test # unit tests incl. per-provider wire fixtures
$ npm run smoke # real MCP client ↔ built CLI over stdio
$ node bench/run.mjs # micro-benchmarks, your key and region
Substantially written with Claude Code (AI-assisted).
MIT © shitianfang
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