GitHubAI Skills, Agents & MCP · Agent rules
Large collection of .cursorrules and .mdc rule files organised by framework and language for Cursor and Windsurf.
Why it’s a gem
Still the biggest rule corpus; most rules port straight to CLAUDE.md.
Opinionated cursor rules repo that also ships a maintained AGENTS.md translation of the same rule set.
Library of DESIGN.md files capturing real brand design systems — colour, type, spacing — in a format coding agents can read directly.
Curated real-world AGENTS.md files, templates, guides and tooling for Codex-style and cross-vendor agents.
Advanced .mdc rules for Cursor covering agent memory management and multi-step development workflows.
Machine-generated .mdc rule files derived from library documentation, one rule set per package.