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Agent skill

Clerk

by geekskai in geekskai/blog

Clerk authentication router. An agent skill from geekskai/blog.

MITAuto-check passedBackend & APIs

Install Clerk

skills CLI
$ npx skills add geekskai/blog --skill clerk -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install geekskai/blog clerk --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/geekskai/blog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/clerk .claude/skills/clerk && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
clerk
GitHub stars
103
Used in
3 other repos
Token cost
~1.5k tokens
SKILL.md length
592 words
Files
1
Skills in repo
20
Repo updated
First seen
Licence
MIT

At a glance

Clerk authentication router. An agent skill from geekskai/blog.

  • User asks about Clerk CLI operations
  • SKILL.md covers Version Detection, By Task and Quick Navigation
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Adding authentication

What it does

Clerk is an agent skill from geekskai/blog. Clerk authentication router. Use when user asks about Clerk CLI operations, adding authentication, setting up Clerk, custom sign-in flows, Swift or native iOS auth, native Android auth, Next.js patterns, React patterns, Vue patterns, Nuxt patterns, Astro patterns, TanStack Start patterns, Expo patterns, React Router patterns, Chrome Extension patterns, organizations, billing, subscriptions, payments, pricing, plans, seat-based pricing, feature entitlements, syncing users, testing, impersonating a user, or testing…

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs, covering Payments and billing, Cross-platform mobile apps and React components. It works with Expo, Next.js, React Router and TanStack. The repository describes itself as: 🚀 2026 Most Popular FREE Blog Template! Next.js 14, Zero Code - Just Write & Deploy | 2026最火免费博客模板！支持Markdown，一键部署，极致性能！⚡️ ✨ Write in Markdown, get your professional blog in…. The licence is MIT.

When your agent uses it

  • User asks about Clerk CLI operations
  • Adding authentication
  • Setting up Clerk
  • Custom sign-in flows

Example prompts

  • “/clerk”

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 nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

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

  • Network

    No URLs in SKILL.md.

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

  • Credentials

    Names no API keys, tokens, secrets or passwords.

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

Context cost

Clerk loads about 1.5k tokens when it runs. Until then it costs about 152 tokens; SKILL.md has 592 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~152
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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). 592 words, ~1,516 tokens.

Download SKILL.mdSave it as .claude/skills/clerk/SKILL.md (or your agent's skills folder).
name
clerk
description
Clerk authentication router. Use when user asks about Clerk CLI operations, adding authentication, setting up Clerk, custom sign-in flows, Swift or native iOS auth, native Android auth, Next.js patterns, React patterns, Vue patterns, Nuxt patterns, Astro patterns, TanStack Start patterns, Expo patterns, React Router patterns, Chrome Extension patterns, organizations, billing, subscriptions, payments, pricing, plans, seat-based pricing, feature entitlements, syncing users, testing, impersonating a user, or testing webhooks locally. Automatically routes to the specific skill based on their task.
license
MIT
metadata.version
2.0.0

Clerk Skills Router

Version Detection

Check package.json to determine the Clerk SDK version. This determines which patterns to use:

PackageCore 2 (LTS until Jan 2027)Current
@clerk/nextjsv5–v6v7+
@clerk/react or @clerk/clerk-reactv5–v6v7+
@clerk/expo or @clerk/clerk-expov1–v2v3+
@clerk/react-routerv1–v2v3+
@clerk/tanstack-react-start< v0.26.0v0.26.0+

Default to current if the version is unclear or the project is new. Core 2 packages use @clerk/clerk-react and @clerk/clerk-expo (with clerk- prefix); current packages use @clerk/react and @clerk/expo.

All skills are written for the current SDK. When something differs in Core 2, it's noted inline with > **Core 2 ONLY (skip if current SDK):** callouts. The exception is clerk-custom-ui, which has separate core-2/ and core-3/ directories for custom flow hooks since those APIs are entirely different between versions.

By Task

Adding Clerk to your project → Use clerk-setup

  • Framework detection and quickstart
  • Environment setup, API keys, Keyless flow
  • Migration from other auth providers

Operating Clerk from the CLI → Use clerk-cli

  • Auth, linking, doctor, and environment pulls
  • User, org, session, app, and instance management
  • Impersonating a user (clerk impersonate) and local webhook testing (clerk webhooks listen)
  • Feature toggles (clerk enable orgs, clerk enable billing)
  • Backend, Platform, and Frontend API calls through clerk api
  • Deploy handoff and deploy status verification

Custom sign-in/sign-up UI → Use clerk-custom-ui

  • Custom authentication flows with useSignIn / useSignUp hooks
  • Appearance and styling (themes, colors, layout)
  • <Show> component for conditional rendering

Advanced Next.js patterns → Use clerk-nextjs-patterns

  • Server vs Client auth APIs
  • Middleware strategies
  • Server Actions, caching
  • API route protection

React patterns → Use clerk-react-patterns

  • Hooks (useAuth, useUser, useClerk)
  • Protected routes, auth guards
  • Router integration

React Router patterns → Use clerk-react-router-patterns

  • Loaders & actions with auth
  • Route protection
  • SSR auth

Vue patterns → Use clerk-vue-patterns

  • Composables (useAuth, useUser, useClerk)
  • Vue Router guards
  • Pinia auth store integration

Nuxt patterns → Use clerk-nuxt-patterns

  • Server middleware auth
  • SSR auth with composables
  • Server API routes

Astro patterns → Use clerk-astro-patterns

  • SSR auth pages
  • Island components with React
  • Middleware & API routes

TanStack Start patterns → Use clerk-tanstack-patterns

  • Server functions with auth
  • Route protection via loaders
  • Vinxi server integration

Expo / React Native auth → Use clerk-expo

  • Prebuilt native components (AuthView, UserButton)
  • Custom flows: email, password, SMS/phone OTP, MFA
  • OAuth/SSO and native Google/Apple sign-in
  • Expo Router protected routes, token storage, push notifications
Show full SKILL.md (231 more words)Show less

Chrome Extension patterns → Use clerk-chrome-extension-patterns

  • Background scripts auth
  • Popup auth flows
  • Content scripts with sync host

B2B / Organizations → Use clerk-orgs

  • Multi-tenant apps
  • Organization slugs in URLs
  • Roles, permissions, RBAC
  • Member management

Billing & Subscriptions → Use clerk-billing

  • <PricingTable /> component
  • Plan and feature gating with has()
  • Seat-based B2B billing with organizations
  • Subscription lifecycle webhooks
  • Free trials, invoicing

Webhooks → Use clerk-webhooks

  • Real-time events
  • Data syncing
  • Notifications & integrations

E2E Testing → Use clerk-testing

  • Playwright/Cypress setup
  • Auth flow testing
  • Test utilities

Swift / native iOS auth → Use clerk-swift

  • Native iOS Swift and SwiftUI projects
  • ClerkKit and ClerkKitUI implementation guidance
  • Source-driven patterns from clerk-ios

Android / native mobile auth → Use clerk-android

  • Native Android Kotlin and Jetpack Compose projects
  • clerk-android-api and clerk-android-ui implementation guidance
  • Source-driven patterns from clerk-android
  • Do not use for Expo or React Native projects

Backend REST API → Use clerk-backend-api

  • Browse API tags and endpoints
  • Inspect endpoint schemas
  • Execute API requests with scope enforcement

Quick Navigation

If you know your task, you can directly access:

  • /clerk-setup - Framework setup
  • /clerk-cli - CLI operations and Clerk resource management
  • /clerk-custom-ui - Custom flows & appearance
  • /clerk-nextjs-patterns - Next.js patterns
  • /clerk-react-patterns - React patterns
  • /clerk-react-router-patterns - React Router patterns
  • /clerk-vue-patterns - Vue patterns
  • /clerk-nuxt-patterns - Nuxt patterns
  • /clerk-astro-patterns - Astro patterns
  • /clerk-tanstack-patterns - TanStack Start patterns
  • /clerk-expo - Expo / React Native
  • /clerk-chrome-extension-patterns - Chrome Extension patterns
  • /clerk-orgs - Organizations
  • /clerk-billing - Billing & subscriptions
  • /clerk-webhooks - Webhooks
  • /clerk-testing - Testing
  • /clerk-swift - Swift/native iOS
  • /clerk-android - Native Android
  • /clerk-backend-api - Backend REST API

Or describe what you need and I'll recommend the right one.

© 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

Just SKILL.md in .agents/skills/clerk of geekskai/blog.

Open the folder on GitHubat commit 347e8ab

Used in 3 other repositories

We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in geekskai/blog, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Clerk next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Clerk compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Clerk this skillgeekskai/blog1033 repos~1.5kAutomated safety check: PassMIT
Feature Sliced Designfeature-sliced/skills109—~5.5kAutomated safety check: PassNone
Sanity Best Practicessanity-io/agent-toolkit187—~1.3kAutomated safety check: PassMIT
App Buildersoftspark/ai-toolkit179—~2.2kAutomated safety check: PassApache-2.0
Supabasecurvenote/curvenote1695 repos~2.2kAutomated safety check: PassCustom licence
Adynato Mobile APImajiayu000/claude-skill-registry6661 repos~2.5kAutomated safety check: PassMIT

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More from geekskai/blog

All 20 skills in this repo

  • Clerk Android

    geekskai/blog

    Implement Clerk authentication for native Android apps using Kotlin and Jetpack Compose with clerk-android source-guided patterns.

    103 GitHub starsUsed in 1 repo~2.1k tokens
    Auto-check passed

  • Clerk React Patterns

    geekskai/blog

    React SPA auth patterns with @clerk/react for Vite/CRA - ClerkProvider setup, useAuth/useUser/useClerk hooks, React Router protected routes, custom sign-in flows.

    103 GitHub starsUsed in 1 repo~1k tokens
    Auto-check: notes

  • Clerk React Router Patterns

    geekskai/blog

    React Router v7/v8 patterns with Clerk — rootAuthLoader, getAuth in loaders, clerkMiddleware, protected routes, SSR user data, org switching.

    103 GitHub starsUsed in 1 repo~1.8k tokens
    Auto-check passed

  • Clerk Tanstack Patterns

    geekskai/blog

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

    103 GitHub starsUsed in 1 repo~875 tokens
    Auto-check: notes

  • Clerk Astro Patterns

    geekskai/blog

    Astro patterns with Clerk — middleware, SSR pages, island components, API routes, static vs SSR rendering.

    103 GitHub stars~822 tokensUpdated yesterday
    Auto-check: notes

  • Clerk Billing

    geekskai/blog

    Clerk Billing for subscription management - render Clerk's PricingTable and in-app checkout drawer, configure subscription plans, seat-limit plans for B2B, feature entitlements with has(), and…

    103 GitHub stars~5.1k tokensUpdated yesterday
    Auto-check passed

Works with

Categories

Questions about Clerk

What does Clerk do?

Clerk authentication router. An agent skill from geekskai/blog. Clerk is an agent skill from geekskai/blog. Clerk authentication router.

When should I use Clerk?

Clerk fits situations like: user asks about Clerk CLI operations; adding authentication; setting up Clerk; custom sign-in flows.

How do I install Clerk in Claude Code?

Run `npx skills add geekskai/blog --skill clerk -a claude-code`. Or copy the skill folder (.agents/skills/clerk in geekskai/blog) into .claude/skills/clerk in your project. Claude Code loads it when a task matches its description.

How do I install Clerk in Codex?

Run `npx skills add geekskai/blog --skill clerk -a codex`. Or copy the skill folder (.agents/skills/clerk in geekskai/blog) into .agents/skills/clerk in your project. Codex loads it when a task matches its description.

Can I use Clerk in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add geekskai/blog --skill clerk -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/clerk, .gemini/skills/clerk, .github/skills/clerk and .opencode/skills/clerk in your project.

What does Clerk need to run?

SKILL.md names no scripts, command-line tools or credentials: Clerk is instructions for the agent only.

Does Clerk access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Clerk safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Clerk use?

Clerk is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Clerk use?

About 1.5k tokens (SKILL.md is roughly 6.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Clerk?

Skills that share tags, products or a category with Clerk: Feature Sliced Design (feature-sliced/skills, 109 stars), Sanity Best Practices (sanity-io/agent-toolkit, 187 stars), App Builder (softspark/ai-toolkit, 179 stars) and Supabase (curvenote/curvenote, 169 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Clerk?

geekskai (a GitHub user) maintains it in geekskai/blog, which has 103 GitHub stars. The repository holds 20 skills in this directory. The repository was last updated on October 6, 2026.

Source: geekskai/blog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.