Implement Sign in with Apple and OAuth flows for iOS apps.
npx skills add https://github.com/KumarAdi8/AgentKit --skill authentication-kumaradi8
Please help me install this Agent Skill. Skill: authentication Source: https://github.com/KumarAdi8/AgentKit/tree/main/skills/authentication Command: npx skills add https://github.com/KumarAdi8/AgentKit --skill authentication-kumaradi8
This Skill provides clear, practical guidance for implementing secure, production-ready authentication on iOS so developers can reliably handle Sign in with Apple, OAuth web flows, password AutoFill, and biometric re-authentication without common pitfalls.
Use the authentication skill to add Sign in with Apple and ASWebAuthenticationSession flows, validate identity tokens server-side, check credential state on launch, and store session tokens securely in the Keychain.
High-intent search queries and answers about installing and using this skill.
To implement Sign in with Apple in a SwiftUI app, set up ASAuthorizationController, handle delegate callbacks, cache the first-time email and full name, and persist the stable user identifier in the Keychain for session management.
ASWebAuthenticationSession handles OAuth callback redirects by opening a secure web view for provider logins, managing the authentication flow, and capturing the authorization code to exchange with your backend for valid session tokens.
Validate a Sign in with Apple identity token server-side by sending the token to your backend, verifying the JWT signature against Apple's JWKS, and confirming the payload claims before issuing a user session.
Yes, you can use LAContext for biometric re-authentication by prompting the user with Face ID or Touch ID, then securely storing and retrieving session tokens from the Keychain using SecAccessControl restrictions.
The best way to check Sign in with Apple credential state on app launch is to silently query the authorization status and observe credential revocation notifications to immediately handle logged-out or revoked user sessions.
Yes, you need NSFaceIDUsageDescription in Info.plist when using biometric authentication on iOS, as it provides the required user-facing privacy message explaining why your app needs to access Face ID for secure sign-in flows.
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