Auth Implementation

Expert guidance for implementing production-grade authentication systems based on patterns proven at billion-user scale. This skill helps you choose the right authentication approach, implement it securely, and avoid common pitfalls that cause security vulnerabilities or scale issues.

When to Use This Skill

Use this skill when you need to:

• Implement user authentication (login, signup, password reset)
• Add Single Sign-On (SSO) capabilities
• Secure APIs with proper authentication
• Migrate from passwords to passwordless authentication
• Implement machine identity for AI agents or services
• Design multi-tenant authentication architecture
• Handle session management and token lifecycle
• Meet enterprise security and compliance requirements

Protocol Selection Framework

Decision Matrix