human-auth-biometric

Human Auth: Biometric

Use this when an app requires biometric authentication (fingerprint, face recognition) that the emulator cannot provide.

When to Trigger

• App shows a fingerprint or face recognition dialog.
• App requires biometric confirmation for a sensitive action (payment, account access).
• Emulator shows "No biometric hardware detected" or similar.

How to Call

request_human_auth(
  capability: "biometric",
  instruction: "App requires biometric authentication. Please confirm this action.",
  uiTemplate: {
    title: "Biometric Confirmation Required",
    summary: "The app needs fingerprint/face verification. Approve to confirm."
  }
)

What You Receive

• Usually no artifact — just an approval/rejection signal.
• status: approved means the human confirmed the biometric action.

How to Apply

Biometric prompts on the emulator typically cannot be bypassed programmatically. Options:

1. Dismiss and retry: Press Back to dismiss the biometric dialog, then look for a "Use password instead" or "Use PIN" fallback option. Enter the fallback credentials.

2. Emulator fingerprint simulation (if available):

   shell("adb -s <device> emu finger touch 1")
   

   This simulates a fingerprint touch on some emulator versions.

3. If no fallback exists: The flow may be blocked on the emulator. Report this to the user.

Tips

• Most apps that use biometrics also offer a PIN/password fallback. Look for it.
• On emulators with enrolled fingerprints, emu finger touch 1 can simulate a successful scan.
• Real devices with actual biometric hardware would need the human to physically authenticate — this is the primary use case for this delegation.