---
title: "Jeff"
description: "Read-only Go CLI that semantically checks source files against your rules using TypeSafe Jev, locally or in CI, without mutating the tree."
canonical: "https://vibing.inc/library/jeff-vg-2314"
category: "Dev Utilities & Vibe-Coding Tooling"
subcategory: "Codebase hygiene"
license: "Apache-2.0"
author: "Alessandro Ferrini (@Alurith)"
source: "https://github.com/Alurith/jeff"
---

# Jeff
Read-only Go CLI that semantically checks source files against your rules using TypeSafe Jev, locally or in CI, without mutating the tree.
## Facts
- Source: https://github.com/Alurith/jeff
- Category: Dev Utilities & Vibe-Coding Tooling / Codebase hygiene
- Author: Alessandro Ferrini (@Alurith)
- Licence: Apache-2.0
- Tags: cli, code-review, jev, go, ci
## Why it's a gem
Semantic review that stays read-only and CI-friendly, not another write-happy coding agent.
---
Listed in The Vibeary: https://vibing.inc/library/jeff-vg-2314 · JSON: https://vibing.inc/api/public/library/gems/jeff-vg-2314