This is the iOS security reference you want open when you're storing tokens, implementing Face ID, or encrypting user data. It covers Keychain Services with the full kSecAttrAccessible spectrum, CryptoKit operations, Secure Enclave key storage, and LocalAuthentication setup. The skill also walks through App Transport Security rules, certificate pinning, and includes practical secure coding patterns like input validation and sensitive data clearing. Honestly, the privacy manifest and App Review compliance checklist alone will save you from rejection headaches. If you're shipping anything that touches credentials, biometrics, or encrypted data on iOS, you'll reference this repeatedly.
npx skills add https://github.com/dpearson2699/swift-ios-skills --skill ios-security