Skills.sh is Vercel's 2026 open directory and ecosystem for modular AI agent skills—reusable "best practices" packs that extend coding agents (like Claude Code, Cursor, etc.) with specialized tools, workflows, and knowledge. Install via simple CLI (npx skills add owner/repo), browse leaderboard of 90+ skills (React, Next.js, Stripe, video gen with Remotion, etc.). Community-driven, zero-config, auto-discoverable—making AI agents smarter, more consistent, and faster for devs without bloating prompts. Free & open-source; huge traction (20K+ installs shortly after launch).