by affaan-m
The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
# Add to your Claude Code skills
git clone https://github.com/affaan-m/ECCGuides for using ai agents skills like ECC.
Last scanned: 5/19/2026
{
"issues": [
{
"type": "npm-audit",
"message": "brace-expansion: brace-expansion: Large numeric range defeats documented `max` DoS protection",
"severity": "medium"
}
],
"status": "PASSED",
"scannedAt": "2026-05-19T07:44:46.948Z",
"semgrepRan": false,
"npmAuditRan": true,
"pipAuditRan": true
}[!WARNING] Official sources only. Install ECC only from verified channels: the GitHub repository github.com/affaan-m/ECC, the npm packages
ecc-universalandecc-agentshield, the GitHub App, the plugin slugecc@ecc, and the project website ecc.tools. Third-party re-uploads and unofficial mirrors are not maintained or reviewed by the project and may contain malware.
Run these commands inside Claude Code:
/plugin marketplace add https://github.com/affaan-m/ECC
/plugin install ecc@ecc
That installs ECC's skills, agents, commands, and plugin-managed hooks. If you choose this path, stop there. Do not also run a full manual install into Claude Code.
Guided package setup is coming in
ecc-universal2.2.0. Use the native Claude plugin commands above while npm remains on 2.1.0.
OSS stays free. This repo is MIT-licensed forever. ECC Pro is the hosted GitHub App for private repos. Sponsors and Pro subscribers fund the work. That's why a single maintainer ships weekly across 7 harnesses.
Partners & sponsors
Community sponsors: Mike Morgan · @jasonwu513 · @1anter · @massimotodaro · @meadmccabe
Become a Sponsor · Sponsor Tiers · Sponsorship Program
Your agent can write code, but ECC gives it a coordinated engineering system and toolbox: it plans before it builds, verifies changes with tests, reviews its own work from a fresh context, remembers what matters, and turns repeated wins into reusable skills and workflows.
plan -> test -> implement -> review -> verify -> remember -> improve
Instead of rebuilding that process in every prompt, you install it once and make it part of how your agent works.
Optimize the context window. Persist everything else.
ECC is MIT-licensed open source. It works best with Claude Code today, has a supported Codex sync path, and provides capability-limited adapters for Cursor, OpenCode, Gemini, Zed, GitHub Copilot, Antigravity, Qwen, and other harnesses. See the support status matrix before assuming feature parity.
Access to 68 agents, 285 skills, and 94 legacy command shims, plus hooks, rules, memory, continuous learning, and AgentShield security scanning. The agents are specialized for planning, review, build repair, security, architecture, and domain work.
| Included | Count | What it gives you |
|---|---|---|
| Agents | 68 agents | Planning, review, build repair, security, architecture, and domain work |
| Skills | 285 skills | TDD, research, security, docs, frontend, data, ML, operations, and more |
| Commands | 94 commands | Convenient entry points while ECC moves to a skills-first surface |
| Hooks and memory | Runtime | Enforce |
ECC is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by affaan-m. The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. It has 240,740 GitHub stars.
Yes. ECC passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
Clone the repository with "git clone https://github.com/affaan-m/ECC" and add it to your Claude Code skills directory (see the Installation section above).
ECC is primarily written in JavaScript. It is open-source under affaan-m on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh ECC against similar tools.
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