[mwickett]

Description

The sandbox had no way to show what <SignIn /> and <SignUp /> render when Clerk Protect blocks or challenges an attempt.
This adds six API mocking scenarios for those outcomes and a Scenario picker in the sandbox Controls pane.
Sandbox tooling only: no change to any published package.

Scenarios (packages/clerk-js/sandbox/scenarios/protect.ts)

Scenario	What the mocked API does
ProtectBlockedGeneric	Blocks the first submit with the default message.
ProtectBlockedOutdatedClerkJS	Blocks the first submit with the outdated ClerkJS message and link.
ProtectBlockedNetwork	Blocks the first sign-up submit with the network message.
ProtectBlockedAtVerification	Accepts the first submit, then blocks the password or email code submit.
ProtectChallenge	Requires a challenge after the first submit. A stand-in challenge lets you pass or fail it.
ProtectChallengeThenBlocked	Requires a challenge after the first submit, then blocks once it is solved.

Scenario picker. A "Scenario" folder in the Controls pane lists every scenario (not only these) and "None (live API)". It uses the same storage key and reload as scenario.setScenario().

To try it: pnpm dev:sandbox, open http://localhost:4000/sign-in or /sign-up, pick a scenario, and submit the form with any email address.

Not covered: OAuth and SSO callbacks, second factor, reset password and rate-limit responses have no scenario yet.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other: sandbox tooling

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Nov 12, 2026 6:51pm UTC
swingset	Ready	Preview	Nov 12, 2026 6:51pm UTC

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🦋 Changeset detected

Latest commit: 25e1e96

The changes in this PR will be included in the next version bump.

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commit: 25e1e96