Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Mindrally/skills --skill clerk-authenticationgit clone --depth 1 https://github.com/Mindrally/skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mindrally/skills/clerk-authentication)<a href="https://agentmods.dev/skills/mindrally/skills/clerk-authentication"><img src="https://agentmods.dev/badge/skills/mindrally/skills/clerk-authentication.svg" alt="Measured on agentmods" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00024 | $0.02908 |
| Opus 5 | $0.00012 | $0.01454 |
| Sonnet 5 | $0.00005 | $0.00582 |
| Haiku 4.5 | $0.00002 | $0.00291 |
Grade A, and why
clerk-authentication scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 562 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Clerk Authentication
You are an expert in Clerk authentication implementation for Next.js applications. Follow these guidelines when integrating Clerk.
Core Principles
- Implement defense-in-depth with multiple authentication layers
- Verify authentication at every data access point, not just middleware
- Protect server actions individually
- Use Clerk's built-in security features (HttpOnly cookies, CSRF protection)
Installation and Setup
npm install @clerk/nextjs
Environment Variables
# Required
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_...
CLERK_SECRET_KEY=sk_...
# Optional: Custom URLs
NEXT_PUBLIC_CLERK_SIGN_IN_URL=/sign-in
NEXT_PUBLIC_CLERK_SIGN_UP_URL=/sign-up
NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL=/dashboard
NEXT_PUBLIC_CLERK_AFTER_SIGN_UP_URL=/dashboard
Provider Setup
App Router (app/layout.tsx)
import { ClerkProvider } from '@clerk/nextjs';
export default function RootLayout({
children,
}: {
children: React.ReactNode;
}) {
return (
<ClerkProvider>
<html lang="en">
<body>{children}</body>
</html>
</ClerkProvider>
);
}
With Custom Appearance
import { ClerkProvider } from '@clerk/nextjs';
import { dark } from '@clerk/themes';
export default function RootLayout({ children }: { children: React.ReactNode }) {
return (
<ClerkProvider
appearance={{
baseTheme: dark,
variables: {
colorPrimary: '#3b82f6',
},
elements: {
formButtonPrimary: 'bg-blue-500 hover:bg-blue-600',
},
}}
>
<html lang="en">
<body>{children}</body>
</html>
</ClerkProvider>
);
}
Middleware Configuration
Basic Middleware (middleware.ts)
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server';
// Define protected routes
const isProtectedRoute = createRouteMatcher([
'/dashboard(.*)',
'/api/protected(.*)',
'/settings(.*)',
]);
// Define public routes (optional, for clarity)
const isPublicRoute = createRouteMatcher([
'/',
'/sign-in(.*)',
'/sign-up(.*)',
'/api/public(.*)',
]);
export default clerkMiddleware(async (auth, req) => {
if (isProtectedRoute(req)) {
await auth.protect();
}
});
export const config = {
matcher: [
// Skip Next.js internals and static files
'/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)',
// Always run for API routes
'/(api|trpc)(.*)',
],
};
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 562 lines · 24 tokens per session scan A 05f5b11ac782
clerk-authentication is a skill published in the GitHub repository Mindrally/skills (258 stars, last pushed 4d ago), licensed Apache-2.0. It adds 24 tokens to every session and 2,908 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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