What it does
ECC is a large add-on pack for AI coding assistants such as Claude Code. Its makers describe it as a system that makes the assistant plan before it builds, check its changes with tests, review its own work and remember what it learned.
It bundles many specialised helper agents, "skills" (reusable instructions the assistant can follow), commands, rules and a security scanner that checks the assistant's settings and files. You install it once instead of repeating the same instructions in every chat.
It works best with Claude Code, and its makers list more limited support for other tools such as Codex, Cursor, OpenCode and Gemini. The project is free and open source; a paid hosted version is offered for private code.
Who it's for
Programmers who already use an AI coding assistant and want it to work in a more careful, structured way.
Can I use it without coding?
With some setup. Needs Node.js, Git and an AI coding tool such as Claude Code, then one guided setup command in the terminal. New to this? Start here.
Can I run it?
- Cost
- Free, with optional paid extrasThe open-source version is free; the makers also sell a hosted or pro version.
- API key
- Not needed
Try it
- Install Node.js, Git and Claude Code on your computer.
- Run ECC's guided setup to add it to Claude Code.
- Keep working with your coding assistant, which now plans, tests and reviews its work.
Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?
Before you install
- Only download from the official GitHub page. Copies with similar names exist for many popular projects.
- License (MIT): Very permissive: free to use, change and share, including for business.
- More on staying safe