ECC

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[!WARNING]

Official sources only. Install ECC only from verified channels: the GitHub repository github.com/affaan-m/ECC, the npm packages ecc-universal and ecc-agentshield, the GitHub App, the plugin slug ecc@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.

Install with Claude Code

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-universal 2.2.0. Use the native

Claude plugin commands above while npm remains on 2.1.0.

ECC Pro + GitHub App Install free · Private repos from $19/seat/mo Sponsor ECC Fund the open-source project Community Discord · Q&A · Show and Tell

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

Jump to install ↓

ECC

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, 286 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 | 286 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 | Enforcement, session summaries, continuous learning, instincts, and context controls | | Rules | Selective | Always-loaded standards you choose by language or project | | AgentShield | Included | Scanning for prompts, hooks, MCP config, permissions, secrets, and agent files |

<img src="assets/star-history-light.svg" alt="ECC star history: first 40,000 stars, January 18 to Februa