abdullah4ai/biometrics
swiftship/internal/skills/data/watchos/biometrics/SKILL.md
watchOS authentication: wrist detection, optic ID, LAContext on watchOS. Use when implementing watchOS-specific patterns related to biometrics.
$ install --global
skillsauthnpx skillsauth add abdullah4ai/apple-developer-toolkit biometricsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Mar 30, 2026, 5:20 AM39.3s1 file scanned
SKILL.md
- name:
- biometrics
- description:
- watchOS authentication: wrist detection, optic ID, LAContext on watchOS. Use when implementing watchOS-specific patterns related to biometrics.
Biometrics (watchOS)
AUTHENTICATION ON watchOS:
- No Face ID or Touch ID — Apple Watch uses wrist detection and optic ID
LAContextis available butbiometryTypereturns.opticIDon Apple Watch Ultra or.none- Primary auth model: watch unlocks when iPhone is nearby + wrist detection
WRIST DETECTION:
- Watch locks automatically when removed from wrist
WKApplication.shared().isAutorotating— not for auth, but useful context- Auth state is implicitly managed by watchOS — if the watch is on wrist and unlocked, the user is authenticated
LAContext ON watchOS:
import LocalAuthentication
func authenticate() async -> Bool {
let context = LAContext()
var error: NSError?
guard context.canEvaluatePolicy(.deviceOwnerAuthentication, error: &error) else {
return false
}
do {
return try await context.evaluatePolicy(
.deviceOwnerAuthentication,
localizedReason: "Authenticate to access sensitive data"
)
} catch {
return false
}
}
RULES:
- Use
.deviceOwnerAuthentication(not.deviceOwnerAuthenticationWithBiometrics) — allows passcode fallback - Do NOT check for
.faceIDor.touchID— they don't exist on watchOS - Wrist detection is the primary security boundary — leverage it rather than prompting repeatedly
- For sensitive data, use
LAContextto confirm the user's identity - No
NSFaceIDUsageDescriptionneeded on watchOS
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