A curated open-source collection of 864+ reusable agentic skills (markdown files) for AI coding assistants including Claude Code, Gemini CLI, Codex CLI, Cursor, GitHub Copilot, and others. Skills are organized into domains like architecture, security, data/AI, DevOps, and testing. Install via npx or git clone into tool-specific directories. Includes official skills from Anthropic, OpenAI, Google, Vercel, Supabase, and Microsoft, plus community contributions. Bundles group skills by developer role (Web Wizard, Security Engineer, etc.) and workflows provide step-by-step execution playbooks.