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Fumadocs: vendor profile

In short

Fumadocs adds llms.txt, .md routes and an MCP route only after a CLI step, so a fresh project has none. www.fumadocs.dev answered Accept: text/markdown with markdown on 2026-11-05 but sent Vary fields that left out Accept. On Next.js the docs hand the Vary header to the CDN, and no Astro recipe for negotiation exists.

At a glance

standards.txt fumadocs

llms-txt               = partial
markdown-negotiation   = partial
markdown-twin          = partial
initial-html           = supports
real-404               = no statement
vary-accept            = partial

1 supports, 4 partial or announced, 1 no statement.

Fumadocs Framework

React docs framework for Next.js, React Router, TanStack Start, Waku and Astro; a CLI adds llms.txt, llms-full.txt, .md routes and an MCP route, and its docs give a proxy recipe for Accept: text/markdown with Vary: Accept.

Type
Framework
Operator, as the facts below state it
Fuma Nama (maintainer) and contributors
Home page
www.fumadocs.dev, answered HTTP 200 on 2026-11-05
Last read
5 November 2026

What it does for this layer

  • Fumadocs runs on Next.js, React Router, TanStack Start, Waku and Astro, and new projects start from npm create fumadocs-app. [primary source] source, read 5 November 2026.
  • Running npx @fumadocs/cli feature llms switches on processed Markdown for the docs collection, adds docsLlms to lib/source.ts and creates the LLM routes. [primary source] source, read 5 November 2026.
  • In Fumadocs, llms.txt and llms-full.txt are app routes (app/llms.txt/route.ts and app/llms-full.txt/route.ts) returning docsLlms.index() and docsLlms.full(). [primary source] source, read 5 November 2026.
  • Fumadocs maps /docs/<slug>.md to the route /llms.mdx/docs/<slug>/content.md through a Next.js rewrite and answers with Content-Type text/markdown. [primary source] source, read 5 November 2026.
  • For Accept-based negotiation fumadocs-core/negotiation exports isMarkdownPreferred and rewritePath, used in a proxy.ts that rewrites docs requests to the Markdown route. [primary source] source, read 5 November 2026.
  • Fumadocs leaves Astro out of Accept negotiation because Astro middleware runs only for on-request pages and docs pages are prerendered. [primary source] source, read 5 November 2026.
  • npx @fumadocs/cli feature mcp adds an /api/mcp route on the streamable HTTP transport with tools to list, search and read docs pages. [primary source] source, read 5 November 2026.
  • Fumadocs configures ZBSearch out of the box, served from a server API endpoint or from a statically cached JSON file on static sites. [primary source] source, read 5 November 2026.
  • A Fumadocs site on Next.js becomes plain static HTML with output: 'export', which needs no Node.js server. [primary source] source, read 5 November 2026.
  • Fumadocs calls its model server-first, built on React Server Components rather than a classic static generator. [primary source] source, read 5 November 2026.
  • www.fumadocs.dev returned Markdown for /docs/what-is-fumadocs under Accept: text/markdown on 2026-11-05, but its Vary header listed rsc and next-router fields, not Accept; /docs with the same header still returned HTML. [observed] source, read 5 November 2026.
  • fumadocs.dev answers every path with a 308 to www.fumadocs.dev, where llms-full.txt measured 950,600 bytes on 2026-11-05. [observed] source, read 5 November 2026.
  • GitHub shows fumadocs-core 16.18.0, fumadocs-ui 16.18.0 and @fumadocs/base-ui 16.18.0 released together on 2026-11-05. [primary source, 2026-11-05] source, read 5 November 2026.

Products and plans

Plans and prices as the vendor's own pages showed them on the date read.
ProductWhat it isPriceAs ofSource
Fumadocs (fumadocs-core, fumadocs-ui, fumadocs-mdx)Headless docs core, default UI and MDX content source for React frameworks.Free, open source
MIT licence, free		2026-11-05source

Standards

The six standards this site tracks; no statement means the pages read said nothing.
StandardStatusWhat the vendor's pages saySource
llms-txtpartialFumadocs creates llms.txt and llms-full.txt routes after npx @fumadocs/cli feature llms; they are not present until that step.source
markdown-negotiationpartialFumadocs documents a proxy.ts with isMarkdownPreferred for Next.js, React Router and TanStack Start, and leaves Astro out.source
markdown-twinpartialA rewrite of /docs/:slug*.md to /llms.mdx/docs/:slug*/content.md gives each page a Markdown URL once the LLM feature is added.source
initial-htmlsupportsFumadocs renders through React Server Components and keeps the host framework's static site generation.source
real-404no statementNo statement found in the Fumadocs quick start, static build or AI pages; www.fumadocs.dev returned 404 for a made-up path on 2026-11-05.none
vary-acceptpartialFumadocs says the negotiated response needs Vary: Accept but that Next.js drops Vary on App Router pages, so it must be set at the CDN.source

Checks on its own site

Readings of fumadocs.dev, the vendor's own website, which describe that site and not the product.
ReadingResultDate
Home page requestHTTP 200; H1 in the initial HTML: yes; 1,762 words; 0 JSON-LD blocks2026-11-05
Request with Accept: text/markdownHTTP 200, text/markdown, Vary: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch2026-11-05
/llms.txt at the host rootHTTP 200, text/plain, 16 KB, starts with an H12026-11-05
A made-up pathHTTP 4042026-11-05
Ora score, cached57, grade C2026-10-06
Cloudflare keyless scan27, L1 Basic Web Presence2026-11-05

What it does not do

  • On Next.js, Fumadocs cannot attach Vary: Accept to App Router page responses; its docs push that header to the CDN. source, read 5 November 2026.

Related pages on this site

Sources

  1. Fumadocs: home page https://www.fumadocs.dev/, read 5 November 2026
  2. Quick Start | Fumadocs https://www.fumadocs.dev/docs, read 5 November 2026
  3. AI & LLMs | Fumadocs https://www.fumadocs.dev/docs/integrations/llms, read 5 November 2026
  4. ZBSearch (default) | Fumadocs https://www.fumadocs.dev/docs/search/orama, read 5 November 2026
  5. Static Build | Fumadocs https://www.fumadocs.dev/docs/deploying/static, read 5 November 2026
  6. What is Fumadocs | Fumadocs https://www.fumadocs.dev/docs/what-is-fumadocs, read 5 November 2026
  7. Releases · fuma-nama/fumadocs · GitHub https://github.com/fuma-nama/fumadocs/releases, read 5 November 2026
  8. Fumadocs LICENSE https://raw.githubusercontent.com/fuma-nama/fumadocs/dev/LICENSE, read 5 November 2026

Last reviewed 5 November 2026