Does this skill support the latest Next.js 16 changes?

Yes, it specifically includes patterns for the required proxy.ts middleware filename and cache invalidation improvements for Next.js 16.

What security patterns are included for Cloudflare Workers?

It emphasizes the use of authorizedParties in token verification to prevent CSRF attacks, a critical step for Clerk on Cloudflare.

How does it handle the 2025-11-10 Clerk breaking changes?

The skill provides a full migration path for the Billing API update, including endpoint renames from /commerce/ to /billing/ and updated field terminology.

How do I fix the '431 Request Header Fields Too Large' error in Vite?

The skill provides configuration fixes for Vite dev mode to handle Clerk's handshake tokens that exceed default header limits.

Can I use this for the new Clerk API Keys beta?

Absolutely. It includes implementation details for the Dec 2025 API Keys component and backend verification patterns for programmatic access.

Clerk Auth Implementation & Migration

Name: Clerk Auth Implementation & Migration
Author: jezweb

byjezweb

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117

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Security & Testing

Streamlines Clerk authentication setup with patterns for Next.js 16, API keys beta, and 2025-11-10 breaking changes.

This skill provides Claude Code with specialized knowledge to navigate the evolving Clerk ecosystem, focusing on high-stakes updates like the December 2025 API Keys beta and the Next.js 16 middleware shift to proxy.ts. It offers production-ready patterns for asynchronous auth helpers, Cloudflare Workers CSRF prevention, and webhook verification, while helping developers avoid common pitfalls such as the 1.2KB JWT claim limit and deprecated commerce endpoints.

Key Features

01Implementation patterns for the Dec 2025 API Keys Beta (User & Org scopes)

02Migration support for the 2025-11-10 Billing/Commerce API breaking changes

03Next.js 16 proxy.ts middleware configuration and migration guides

04117 GitHub stars

05Troubleshooting for JWT size limits and Vite 431 header errors

06CSRF prevention patterns for Cloudflare Workers and serverless environments

Use Cases

01Implementing self-service API key management UIs and backend verification

02Upgrading existing Next.js projects to Clerk v6 and async auth patterns

03Resolving complex session, JWKS, and CSRF errors in production environments

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