Implement comprehensive user authentication flows including email, OAuth, and custom UI.
For full implementation details and code examples, load:
Read(${CLAUDE_SKILL_DIR}/references/implementation-guide.md)
| Error | Cause | Solution |
|---|---|---|
| form_identifier_not_found | Email not registered | Show sign-up prompt |
| form_password_incorrect | Wrong password | Show error, offer reset |
| session_exists | Already signed in | Redirect to dashboard |
| verification_failed | Wrong code | Allow retry, resend code |
Proceed to clerk-core-workflow-b for session management and middleware.
Basic usage: Apply clerk core workflow a to a standard project setup with default configuration options.
Advanced scenario: Customize clerk core workflow a for production environments with multiple constraints and team-specific requirements.