A routing guide for Clerk, a service that handles user sign-in and account management. It directs authentication tasks to the relevant setup pattern for web, iOS, Android, organizations, user syncing, or testing.

Use it when setting up or migrating to Clerk, building custom sign-in flows, supporting native mobile apps, managing organizations, syncing users, or testing authentication.

It helps choose the right Clerk instructions for the project's framework and installed SDK version, including differences between older and current packages.

clerk — Skill for Claude Code and Codex by Benja-Pauls: A routing guide for Clerk, a service that handles…

Install

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.

agentmods

npx agentmods add skills/benja-pauls/serpentstack/clerk

Any agent

npx skills add Benja-Pauls/SerpentStack --skill clerk

Clone the repo

git clone --depth 1 https://github.com/Benja-Pauls/SerpentStack

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/benja-pauls/serpentstack/clerk.svg)](https://agentmods.dev/skills/benja-pauls/serpentstack/clerk)

Your own site

<a href="https://agentmods.dev/skills/benja-pauls/serpentstack/clerk"><img src="https://agentmods.dev/badge/skills/benja-pauls/serpentstack/clerk.svg" alt="Measured on agentmods" height="20"></a>

Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 893 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00059	$0.00893
Opus 5	$0.00030	$0.00447
Sonnet 5	$0.00012	$0.00179
Haiku 4.5	$0.00006	$0.00089

Measured 3d ago against content hash acfa6c532bea, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

clerk 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 3d 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.

.skills/clerk/SKILL.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Clerk Skills Router

Version Detection

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

Package	Core 2 (LTS until Jan 2027)	Current
`@clerk/nextjs`	v5–v6	v7+
`@clerk/react` or `@clerk/clerk-react`	v5–v6	v7+
`@clerk/expo` or `@clerk/clerk-expo`	v1–v2	v3+
`@clerk/react-router`	v1–v2	v3+
`@clerk/tanstack-react-start`	< v0.26.0	v0.26.0+

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

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

B2B / Organizations → Use clerk-orgs

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

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

Read the full file on GitHub · 90 lines

Changes

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.

3d ago First seen · 90 lines · 59 tokens per session scan A acfa6c532bea

Subscribe to this mod's changes

clerk is a skill published in the GitHub repository Benja-Pauls/SerpentStack (2 stars, last pushed 5mo ago), licensed MIT. It adds 59 tokens to every session and 893 once invoked, about $0.0003 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 2026-08-31.

Backend and APIs agent-skills ai claude-code cli codex developer-tools

systematic-debugging

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

obra/superpowers · 21 tokens

brainstorming

You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior. Explores user intent, requirements and design before implementation.

obra/superpowers · 37 tokens

auto-perf-optimize

Run agent-driven VS Code performance or memory investigations. Use when asked to launch Code OSS, automate a VS Code scenario, run the Chat memory smoke runner, capture renderer heap snapshots, take workflow screenshots, compare run summaries, or drive a repeatable scenario before heap-snapshot analysis.

microsoft/vscode · 62 tokens

chat-perf

Run chat perf benchmarks and memory leak checks against the local dev build or any published VS Code version. Use when investigating chat rendering regressions, validating perf-sensitive changes to chat UI, or checking for memory leaks in the chat response pipeline.

microsoft/vscode · 51 tokens

chat-pet-sprite-creation

Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.

microsoft/vscode · 53 tokens

cpu-profile-analysis

Analyze V8/Chrome CPU profiles (.cpuprofile) and DevTools trace files (Trace-.json). Use when: profiling performance, investigating slow functions, comparing code paths, finding bottlenecks, analyzing timeToRequest, understanding call trees from sampling profiler data, analyzing layout/paint/rendering, investigating…

microsoft/vscode · 71 tokens