rails-ai-context

rails-ai-context is a Ruby gem that connects AI coding assistants directly to your Rails application as a source of truth. It provides 45 read-only tools over the Model Context Protocol, letting assistants query your actual schema, models, routes, controllers, and conventions instead of relying on training data. The gem works standalone or as a Gemfile dependency and can answer queries even when your app won't boot.

Designed for developers using Claude Code, Cursor, GitHub Copilot, OpenCode, or Codex CLI, it eliminates common mistakes like calling non-existent associations or missing inherited authentication logic. Installation takes minutes, and the tool includes safety features like SQL injection protection and file access restrictions.