How does this skill handle the Clerk 2025-11-10 API breaking changes?

It provides logic to update commerce endpoints to billing, transition payment_source to payment_method, and handle new null-value rules in API responses.

What is the recommended fix for '431 Request Header Fields Too Large' in Vite?

The skill provides a configuration for package.json to increase the Node max-http-header-size to 32768, accommodating larger Clerk dev tokens.

Does this skill support the latest Next.js versions?

Yes, it fully supports Next.js 15 and 16, specifically focusing on the requirement to await the auth() helper.

Can I test authentication without sending real SMS or emails?

Yes, it guides you through using test credentials and the fixed OTP 424242 for both manual and automated testing.

Clerk Auth & Security

Name: Clerk Auth & Security
Author: jezweb

byjezweb

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보안 및 테스팅

Implements and troubleshoots Clerk authentication using the latest API standards, async patterns, and advanced security hardening.

This skill provides specialized knowledge for integrating Clerk authentication, specifically addressing the 2025-11-10 API breaking changes and Next.js v6 asynchronous patterns. It guides users through complex configurations like JWT size optimization, PKCE for custom OAuth, and CSRF protection for serverless environments like Cloudflare Workers. By utilizing this skill, developers can avoid common pitfalls such as 431 header errors, session token leaks, and JWKS race conditions while implementing robust E2E testing workflows with Playwright.

주요 기능

0191 GitHub stars

02Troubleshooting for common errors like 431 Header Too Large and Missing Secret Keys

03Security hardening via authorizedParties CSRF prevention and PKCE support

04JWT template optimization to stay within 1.2KB custom claim limits

05Migration support for Clerk API 2025-11-10 and Next.js v6 async auth() patterns

06Automated E2E testing integration using Playwright and fixed OTP credentials

사용 사례

01Securing Cloudflare Workers and serverless functions with proper token verification

02Upgrading legacy Clerk implementations to the latest 2025 breaking change standards

03Setting up comprehensive authentication testing suites for Next.js 15+ applications

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jezweb/claude-skills clerk-auth

For use in Claude.ai and ChatGPT

Download Skill