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SKILL verified MIT Self-run

Ios Add Auth

skill-edfenton-claude-skills-ios-add-auth · by edfenton

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

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Install

$ agentstack add skill-edfenton-claude-skills-ios-add-auth

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

Purpose

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

Arguments

  • --providers — 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

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

Workflow

  1. Add Sign in with Apple capability in Xcode
  2. Create auth services and managers
  3. Create sign-in UI
  4. Create authenticated container wrapper
  5. Integrate with DependencyContainer
  6. Add Info.plist entries
  7. 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

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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