This repository provides universal, MIT-licensed rule sets inspired by Clean Code, Refactoring, Domain-Driven Design, Clean Architecture, and Designing Data-Intensive Applications. It packages these as ready-to-use AGENTS.md files for Codex, Cursor, and Claude Code, released in three versions: mini, nano, and full. The rules guide AI coding agents on code quality, refactoring, architecture decisions, and reliability patterns. Setup guides cover always-on vs on-demand usage, MCP and RAG patterns, and tool-specific configuration.