Skills.sh is a registry and package manager for Agent Skills—modular, sharable packages that extend AI agents (e.g., Anthropic’s Claude) with procedural knowledge, scripts, templates and invocation controls; it lets developers and teams discover, install (e.g., npx skills add owner/repo), and run skills that load concise metadata into an agent’s context, provide on‑demand full instructions and executable resources, and thereby specialize general LLMs for reliable, repeatable workflows without bloating the model context; use it to turn a generic AI into task-specific agents, share domain expertise across projects, and compose reusable capabilities that improve efficiency, determinism, and collaboration.