content-cms

The content layer for a Next.js 16 site — plain @next/mdx for a handful of long-form pages (root mdx-components.tsx is mandatory, pageExtensions must include md/mdx, @next/mdx pinned to the next version), content-collections or velite for typed collections at scale, zod v4 frontmatter schemas, long-form prose styled from SYSTEM.md tokens instead of default gray prose classes, and Shiki code blocks highlighted at build inside RSCs (zero client JS). Contentlayer is dead and never an option. Invoke during the backend phase when the brief calls for a blog, docs, changelog, case studies, or any markdown-driven content, when choosing between MDX-in-repo and a headless CMS, or when article pages render as unstyled or default-gray prose. Trigger phrases — "add a blog", "MDX pages", "docs section", "markdown content", "frontmatter", "content collections", "style the article page", "syntax highlighting", "code blocks", "do we need a CMS".