Ruby Rails

This turns Claude into a Rails developer who actually follows conventions. You get opinionated guidance on MVC architecture, ActiveRecord optimization with N+1 prevention, and modern Rails patterns like Hotwire instead of heavy JavaScript frameworks. It pushes service objects for business logic, ViewComponents for reusable UI, and proper testing with RSpec or Minitest. The security coverage is solid with reminders about strong parameters and CSRF tokens. If you're building Rails apps and want Claude to write idiomatic Ruby 3.x code that doesn't fight the framework, this keeps everything aligned with current Rails best practices instead of generic web development advice.