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You can create a custom UI component that prompts users to add a passkey. Use the user.createPasskey() method from Clerk's SDK:

import { useUser } from '@clerk/clerk-react'
export function PasskeyNudge() {  const { isSignedIn, user } = useUser()
  const createClerkPasskey = async () => {    if (!isSignedIn) return
    try {      await user?.createPasskey()      // Show success message    } catch (err) {      console.error('Error:', JSON.stringify(err, null, 2))    }  }
  // Check if user already has passkeys  const hasPasskey = user?.passkeys && user.passkeys.length > 0
  if (hasPasskey) return null
  return (    <div className="passkey-nudge">      <p>🔐 Set up a passkey for faster, more secure sign-ins!</p>      <button onClick={createClerkPasskey}>Add Passkey</button>    </div>  )}

Implementation Strategies

Here are some ways to nudge users:

1. Post-login prompt — Show a modal or banner after sign-in if the user doesn't have a passkey set up
2. Settings page highlight — Add a prominent section in user settings encouraging passkey setup
3. Conditional prompts — Show the nudge after a certain number of SMS-based logins
4. Incentive messaging — Highlight benefits like "Sign in faster with Face ID/Touch ID"

Using an Onboarding Flow

For a more structured approach, you can integrate passkey setup into a custom onboarding flow. Clerk has a guide that shows how to use session tokens, public metadata, and Middleware to require users to complete certain steps before accessing your app:

Add custom onboarding to your authentication flow

You could adapt this pattern to prompt users to set up a passkey as part of onboarding, tracking their passkey status in publicMetadata and redirecting them to a passkey setup page until they've added one.

Prerequisites

• Ensure passkeys are enabled in your Clerk Dashboard under User & Authentication → Passkeys
• Note: Passkeys require a paid plan for production use (free in development)

You can check user.passkeys to determine if a user already has passkeys configured and conditionally show your nudge UI accordingly.