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Generate social media preview images (Open Graph) for Rails apps. Creates an OG image using the project's design system at /og-image, screenshots it at 1200x630, and configures meta tags in the layout head.

TDD and testing patterns for Rails applications using Minitest and fixtures. Use when writing tests, setting up test data, or debugging test failures.

Remove signs of AI-generated writing from text. Use when editing or reviewing text to make it sound more natural and human-written. Based on Wikipedia's comprehensive "Signs of AI writing" guide. Detects and fixes patterns including: inflated symbolism, promotional language, superficial -ing analyses, vague attributions, em dash overuse, rule of three, AI vocabulary words, negative parallelisms, and excessive conjunctive phrases.

This skill should be used when setting up or running the Ralph autonomous coding loop that iterates through stories, runs tests, commits, and logs learnings.

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

Write Ruby and Rails code in DHH's 37signals style. Use when writing Rails code, creating models, controllers, or any Ruby file. Embodies REST purity, fat models, thin controllers, Current attributes, Hotwire patterns, and "clarity over cleverness."

Turbo and Stimulus patterns for Rails applications. Use when implementing interactivity, real-time updates, or frontend behavior without JavaScript frameworks.