Some of the most starred repos on GitHub right now contain zero runtime code. They're markdown files, skill configs, and prompt collections that change how AI models behave.
6 repos worth knowing about, ordered by stars:
- obra/superpowers (200K+ stars)
A full development methodology delivered as 14 SKILL. md files. Forces your coding agent to write a spec before touching code, enforces test-driven development, and isolates tasks into subagents. Works across Claude Code, Codex, Cursor, and Gemini CLI. Created by Jesse Vincent, accepted into Anthropic's official plugin marketplace.
- andrej-karpathy-skills (170K+ stars)
One CLAUDE. md file. 65 lines. Zero dependencies. Four behavioral rules distilled from Karpathy's viral observations about how AI coding agents fail: think before coding, simplicity first, surgical changes, goal-driven execution. Developer Forrest Chang turned the observations into a file you drop into your project root. Probably the highest-leverage single file you can add to any AI-assisted project.
- mattpocock/skills (135K+ stars)
Matt Pocock's personal .claude skills directory, published as a public repo. 21 skill files built from his daily TypeScript workflow. The standout is /grill-me: the agent asks 50+ detailed questions before writing a single line of code. Sessions run about 45 minutes. By the end you have a richer project spec than most PRDs produce.
- Everything Claude Code (100K+ stars)
Won the Anthropic x Cerebral Valley hackathon. 28 specialized agents, 119 skills, 60 slash commands, and a built-in security scanner. Works across Claude Code, Cursor, Codex, and OpenCode from a single AGENTS. md at the root. The closest thing to a full operating system for your coding agent. Created by Affaan Mustafa.
- awesome-chatgpt-prompts (100K+ stars)
The original LLM behavioral modification repo. A community-sourced collection of system prompts that turn ChatGPT into a Linux terminal, a Socratic teacher, a legal advisor, a debate coach. What CLAUDE. md does for coding agents today, this repo did for ChatGPT conversations years earlier. Still actively maintained.
- awesome-claude-skills by ComposioHQ (60K+ stars)
The directory. 1,000+ production-ready Claude Code skills organized by category: developer tools, document processing, data analysis, business workflows, security. Where the other five repos give you specific tools, this one gives you the map of what's available across the entire ecosystem.