Reusable SKILL.md capabilities that give your agent new expertise — installed into .claude/skills/ and friends.
.claude/skills/
Authentication and authorization patterns including OAuth2, JWT, RBAC, session management, and PKCE flows
Application security covering input validation, auth, headers, secrets management, and dependency auditing
Implement Next.js App Router frontend with server components by default, handle authentication state, and ensure all data access goes through API client.