A more artful way to Domain Model your Rails apps.

An infinite canvas for learning — select text, ask, and answers branch out as documents. MCP server for Claude Code, Codex, and any agent.

Easy receipts and invoices for your Ruby on Rails applications

ActiveJob::Performs adds the `performs` macro to set up jobs by convention.

A little bit of magic to make partials perfect for components.

Extract Collaborator Objects from your Active Records, a new concept called Associated Objects

A simple and clean Ruby DSL for creating JSON schemas.

Hindsight: Agent Memory That Learns

Skills for Designers and Engineers.

A single CLAUDE.md file to improve Claude Code behavior, derived from Andrej Karpathy's observations on LLM coding pitfalls.

AI agent skill that researches any topic across Reddit, X, YouTube, HN, Polymarket, and the web - then synthesizes a grounded summary

🤖 Just a command runner

The LLM Evaluation Framework

LEAKED SYSTEM PROMPTS FOR CHATGPT, CLAUDE, GEMINI, GROK, PERPLEXITY, CURSOR, LOVABLE, REPLIT, AND MORE! - AI SYSTEMS TRANSPARENCY FOR ALL! 👐

A multi-model autonomous agentic engineering pipeline driven by linear. Claude + Codex + Linear

Skills based on the Layered Rails book and beyond

A collection of DESIGN.md files analysis by popular brand design systems. Drop one into your project and let coding agents generate a matching UI.

All parts of Claude Code's system prompt, 27 builtin tool descriptions, sub agent prompts (Plan/Explore/Task), utility prompts (CLAUDE.md, compact, statusline, magic docs, WebFetch, Bash cmd, secur…

Type-safe properties stored in JSONB for ActiveRecord models. A modern, lightweight alternative to separate settings tables.

Ruby library for defining, generating and validating JSON Schema

Rails N+1 queries auto-detection with zero false positives / false negatives

Unofficial agent skills + reference guide that teach AI coding assistants to write Rails the 37signals way — extracted from Fizzy, Campfire, and DHH's code reviews

Official Compound Engineering plugin for Claude Code, Codex, Cursor, and more

The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.

🔂 Ralph loop with PRs: Run Claude Code in a continuous loop, autonomously creating PRs, waiting for checks, and merging

Tools for publishing transcripts for Claude Code sessions

Retrospectives done right. Fast, straightforward and open source.

Claude Code plugins for power users

William Strunk Jr.'s Elements of Style (1918) in markdown format for AI agents