Clerk Tanstack Patterns

What it does

When your agent uses it

• : TanStack auth
• CreateServerFn clerk
• BeforeLoad protection
• TanStack Start middleware

Example prompts

• “/clerk-tanstack-patterns”

Requirements

• Node.js
• A credential in CLERK_PUBLISHABLE_KEY
• A credential in CLERK_SECRET_KEY
• Pre-approved tools (allowed-tools): WebFetch

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

1. 1Server layer — createServerFn + auth() from @clerk/tanstack-react-start/server
2. 2Router layer — beforeLoad on route definitions, throws redirect for unauthenticated

What it can do on your machine

Read from SKILL.md and the folder at commit 347e8ab. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • WebFetch

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships script files (TypeScript), which the agent can run.

  Shell commands in SKILL.md call:

  • npm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • clerk.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • CLERK_PUBLISHABLE_KEY
  • CLERK_SECRET_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Clerk Tanstack Patterns loads about 875 tokens when it runs, and up to ~2.9k if it reads all its reference files. Until then it costs about 63 tokens; SKILL.md has 182 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~63

When it runs · the whole SKILL.md, loaded when a task matches

~875

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteMentions a .env fileSKILL.md:39

  `.env`:

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from geekskai/blog at commit 347e8ab, republished under its MIT licence (© geekskai). 182 words, ~875 tokens.

name

clerk-tanstack-patterns

description

TanStack React Start auth patterns with @clerk/tanstack-react-start - createServerFn, beforeLoad guards, loaders, Vinxi server. Triggers on: TanStack auth, createServerFn clerk, beforeLoad protection, TanStack Start middleware.

allowed-tools

WebFetch

license

MIT

metadata.author

clerk

metadata.version

1.0.0

npm install @clerk/tanstack-react-start

CLERK_PUBLISHABLE_KEY=pk_...
CLERK_SECRET_KEY=sk_...

import { clerkMiddleware } from '@clerk/tanstack-react-start/server'
import { createStart } from '@tanstack/react-start'

export const startInstance = createStart(() => {
  return {
    requestMiddleware: [clerkMiddleware()],
  }
})

import { ClerkProvider } from '@clerk/tanstack-react-start'

function RootDocument({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <ClerkProvider>
          {children}
        </ClerkProvider>
      </body>
    </html>
  )
}

import { createFileRoute, redirect } from '@tanstack/react-router'
import { createServerFn } from '@tanstack/react-start'
import { auth } from '@clerk/tanstack-react-start/server'

const authStateFn = createServerFn().handler(async () => {
  const { isAuthenticated, userId } = await auth()
  if (!isAuthenticated) {
    throw redirect({ to: '/sign-in' })
  }
  return { userId }
})

export const Route = createFileRoute('/dashboard')({
  beforeLoad: async () => await authStateFn(),
})

© geekskai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 12 other files (references) in .agents/skills/clerk-tanstack-patterns of geekskai/blog.

• SKILL.md
• evals/evals.json
• references/loaders.md
• references/router-guards.md
• references/server-functions.md
• references/vinxi-server.md
• templates/tanstack-basic-auth/package.json
• templates/tanstack-basic-auth/src/router.tsx
• templates/tanstack-basic-auth/src/routes/__root.tsx
• templates/tanstack-basic-auth/src/routes/index.tsx
• templates/tanstack-basic-auth/src/start.ts
• templates/tanstack-basic-auth/tsconfig.json
• templates/tanstack-basic-auth/vite.config.ts

Open the folder on GitHubat commit 347e8ab

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in geekskai/blog, which our catalogue first saw on October 7, 2026.

• growupanand/ConvoForm.agents/skills/clerk-tanstack-patterns