Everything Claude Code Harness

This is a comprehensive agent harness system that's been battle-tested over 10+ months of daily use. It adds specialized subagents, slash commands like /plan and /security-scan, lifecycle hooks, language-specific rules, and a skills system that lets Claude research before coding instead of hallucinating APIs. The instincts feature is clever: it exports session-learned patterns with confidence scores so the agent gets smarter over time. Works across Claude Code, Cursor, and other IDEs. Installation requires a manual step for rules since plugins can't auto-distribute them, but the install script handles multiple language stacks at once. If you're running AI agents in production and want more structure than raw prompting, this gives you the scaffolding.

skills.sh installs: 1.8K
GitHub stars: 61
last updated: Jul 14, 2026

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Install

$ npx -y skills add aradotso/trending-skills --skill everything-claude-code-harness --agent claude-code

Installs into .claude/skills of the current project.

Files

Everything Claude Code (ECC) — Agent Harness Performance System

Skill by ara.so — Daily 2026 Skills collection.

Everything Claude Code (ECC) is a production-ready performance optimization system for AI agent harnesses. It provides specialized subagents, reusable skills, custom slash commands, memory-persisting hooks, security scanning, and language-specific rules — all evolved from 10+ months of daily real-world use. Works across Claude Code, Cursor, Codex, OpenCode, and Antigravity.

Installation

Option 1: Plugin Marketplace (Recommended)

# Inside Claude Code, run:
/plugin marketplace add affaan-m/everything-claude-code
/plugin install everything-claude-code@everything-claude-code

Option 2: Manual Clone

git clone https://github.com/affaan-m/everything-claude-code.git
cd everything-claude-code

# Install rules for your language stack
./install.sh typescript
# Multiple languages:
./install.sh typescript python golang swift
# Target a specific IDE:
./install.sh --target cursor typescript