When I found this repo (credit to @NotLucknite), I spent a full day reading through the Anthropic folder. The thing that surprised me most wasn't any single rule — it was how opinionated the prompts are. They explicitly tell Claude to disagree with you, never compliment your code, and answer "4" when you ask "what is 2+2."

The security section for the Chrome extension is genuinely impressive — a full injection defense protocol that treats every web page as potentially hostile. I haven't seen anything this thorough from any other AI company.

Happy to answer questions about what I found or how Claude Code works in practice.