What is Skill123?
Skill123 is a curated marketplace of Agent Skills — portable SKILL.md folders that teach AI agents specialized workflows. Skills are quality-scored and verified for Cursor, Claude Code, Copilot, Windsurf, Codex CLI, and other agentskills.io-compatible agents.
How do I install an Agent Skill?
Copy the install prompt into your agent, or run npx skills add <github-url>. You can also download the GitHub zip and copy the skill folder into ~/.cursor/skills/ (or the matching path for Claude Code, Copilot, and other agents).
Which platforms are supported?
Skill123 skills target Cursor, Claude Code, GitHub Copilot, Windsurf, Codex CLI, Open Agents, WorkBuddy, and Qwen Work. Each skill page lists compatible platforms and install paths.