Ios add auth

Skill edfenton/claude-skills/ios/ios-add-auth

A collection of Claude Code skills for iOS, MERN, NEAN, and shared development workflows

Install

npx -y skills add edfenton/claude-skills --skill ios-add-auth

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Add authentication to an iOS app with Sign in with Apple, biometrics, and Keychain storage.

SKILL.md

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Purpose

Add secure authentication to an existing iOS project using Apple-native approaches.

Arguments

--providers <list> — Comma-separated providers (default: apple,biometric)
- apple — Sign in with Apple
- biometric — Face ID / Touch ID
- credentials — Email/password (requires backend)
--with-backend — Include API client for backend auth

What gets created

Services/
├── Auth/
│   ├── AuthService.swift           # Main auth service
│   ├── AuthState.swift             # Auth state enum
│   ├── KeychainManager.swift       # Secure token storage
│   ├── BiometricAuthManager.swift  # Face ID / Touch ID
│   └── SignInWithAppleManager.swift

Features/
├── Auth/
│   ├── SignInView.swift            # Sign-in screen
│   ├── SignInViewModel.swift
│   └── AuthenticatedContainer.swift # Wraps authenticated content

Models/
└── User.swift                      # User model

Capabilities required

Add to Xcode project:

Sign in with Apple capability (for apple provider)

Add to Info.plist:

NSFaceIDUsageDescription — "Use Face ID to unlock the app"

Keychain storage

Access tokens stored in Keychain (not UserDefaults)
Uses kSecAttrAccessibleWhenUnlockedThisDeviceOnly
Biometric-protected option available

Auth flow

Check for existing session (Keychain)
If biometrics enabled, prompt for Face ID/Touch ID
If no session, show sign-in screen
On successful auth, store tokens in Keychain
Handle token refresh (if backend)

Workflow

Add Sign in with Apple capability in Xcode
Create auth services and managers
Create sign-in UI
Create authenticated container wrapper
Integrate with DependencyContainer
Add Info.plist entries
Test on device (biometrics require device)

Security requirements

Never store tokens in UserDefaults
Use Keychain with appropriate accessibility
Validate Sign in with Apple tokens server-side
Handle biometric fallback gracefully
Clear Keychain on sign-out

Output

Summarize: providers configured, capabilities needed, UI components, security setup.

Reference

For implementation details and security patterns, see reference/ios-add-auth-reference.md