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harness engineering

We are not directly embedding the original Everything Claude Code repository into our product. Instead, we treat it as a reference harness and extract only the useful patterns: agent instructions, rules, skills, commands, hooks, verification loops, and security practices. Then we rebuild them into a

Code Cerebral Valley

Core trick

Extracts agent instructions, hooks, and verification loops from a reference harness and rebuilds them as product components.

Evidence

README matched ""Cerebral Valley" "Opus 4.6"": README.md

Tags

dev toolssecurity
SeolJhin/harness-engineering★ 10 forksJavaScriptMITCreated May 6, 2026 · last push Oct 13, 2026

README excerpt

**Language:** English | [Português (Brasil)](docs/pt-BR/README.md) | [简体中文](README.zh-CN.md) | [繁體中文](docs/zh-TW/README.md) | [日本語](docs/ja-JP/README.md) | [한국어](docs/ko-KR/README.md) | [Türkçe](docs/tr/README.md)

# Everything Claude Code

![Everything Claude Code — the performance system for AI agent harnesses](assets/hero.png)

[![Stars](https://img.shields.io/github/stars/affaan-m/everything-claude-code?style=flat)](https://github.com/affaan-m/everything-claude-code/stargazers)
[![Forks](https://img.shields.io/github/forks/affaan-m/everything-claude-code?style=flat)](https://github.com/affaan-m/everything-claude-code/network/members)
[![Contributors](https://img.shields.io/github/contributors/affaan-m/everything-claude-code?style=flat)](https://github.com/affaan-m/everything-claude-code/graphs/contributors)
[![npm ecc-universal](https://img.shields.io/npm/dw/ecc-universal?label=ecc-universal%20weekly%20downloads&logo=npm)](https://www.npmjs.com/package/ecc-universal)
[![npm ecc-agentshield](https://img.shields.io/npm/dw/ecc-agentshield?label=ecc-agentshield%20weekly%20downloads&logo=npm)](https://www.npmjs.com/package/ecc-agentshield)
[![GitHub App Install](https://img.shields.io/badge/GitHub%20App-150%20installs-2ea44f?logo=github)](https://github.com/marketplace/ecc-tools)
[![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
![Shell](https://img.shields.io/badge/-Shell-4EAA25?logo=gnu-bash&logoColor=white)
![TypeScript](https://img.shields.io/badge/-