jevvy

# Jevvy

**Fast probabilistic judgments inside coding-agent workflows**

A plugin collection powered by TypeSafe's [System One model](https://typesafe.ai).

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## Jevvy Permissions

<p>
  <a href="https://www.npmjs.com/package/@jevvy/permissions"><img alt="npm version" src="https://img.shields.io/npm/v/%40jevvy%2Fpermissions?style=flat&labelColor=000000&color=000000" /></a>
  <a href="https://www.npmjs.com/package/@jevvy/permissions"><img alt="npm downloads" src="https://img.shields.io/npm/dm/%40jevvy%2Fpermissions?style=flat&labelColor=000000&color=000000" /></a>
</p>

The permissions plugin auto-approves harmless shell permission requests. Anything uncertain continues through your agent's normal permission flow.

### OpenCode (v2)



In this isolated demo, a test reviewer requests the nonmatching OpenCode approvals.

### Claude Code



Claude checks readable ask settings; managed, command-line, and session-only rules are not visible to its hook.

## Quickstart

Node.js 22.19 or newer is required.

```bash
npx @jevvy/permissions init
```

## Manual setup

### OpenCode

Starting in 0.6.0, the OpenCode integration in Jevvy Permissions requires OpenCode 2.0.27 or newer.

```bash
opencode plugin add @jevvy/permissions
```

For OpenCode v2 versions before 2.0.27:

```bash
opencode plugin add @jevvy/permissions@0.5.1
```

Starting in 0.9.0, Jevvy Permissions also provides a **Jevvy** indicator in the session header on OpenCode Desktop 2.2.0 or newer. Its text is green when auto-review is enabled, red when disabled, and neutral when status or setup is unavailable. Click it or use **Toggle Jevvy Permissions** in the command palette to toggle OpenCode review globally on that session's server. Claude Code's toggle is independent. `/jevvy` remains available without the GUI e