Passkeys

Passkey authentication for iOS apps — registration, assertion, AutoFill-assisted requests, automatic upgrades, combined credential flows, and migration from password-based auth.

When to Use This Skill

Use when you need to:

• ☑ Add passkey sign-in to an iOS app
• ☑ Replace password-based authentication with passkeys
• ☑ Configure ASAuthorizationController for passkey registration or assertion
• ☑ Set up AutoFill-assisted passkey requests (QuickType bar)
• ☑ Add automatic passkey upgrades for existing password users (iOS 18+)
• ☑ Support combined credential requests (passkey + password + Sign in with Apple)
• ☑ Configure associated domains for webauthn/webcredentials
• ☑ Debug passkey assertion failures or missing QuickType suggestions

Example Prompts