--- title: "Jekyll: vendor profile: Agent Ready HTML" description: "Jekyll, a framework: 1 of 6 standards stated as supported, 13 sourced facts, dated plans and what it does not do. Read 2026-11-05." canonical: https://agentreadyhtml.com/vendors/jekyll/ site: "Agent Ready HTML" last_updated: 2026-11-05 section: "Vendors" --- # Jekyll: vendor profile: Agent Ready HTML > Jekyll, a framework: 1 of 6 standards stated as supported, 13 sourced facts, dated plans and what it does not do. Read 2026-11-05. Source: https://agentreadyhtml.com/vendors/jekyll/ Site: Agent Ready HTML Last reviewed: 2026-11-05 # Jekyll: vendor profile In short Every .md source page becomes .html in \_site, so no markdown copy exists at any URL unless it is copied by hand. Outside GitHub Pages and WEBrick, the 404.html needs server configuration before it carries a 404 status. jekyllrb.com returned 404 for /llms.txt and for a made-up path on 2026-11-05. Jekyll is free under the MIT licence. ## At a glance **standards.txt** jekyll ```text llms-txt = no statement markdown-negotiation = no statement markdown-twin = no statement initial-html = supports real-404 = partial vary-accept = no statement ``` 1 supports, 1 partial or announced, 4 no statement. **Jekyll** Framework Jekyll is a Ruby static site generator and the engine behind GitHub Pages. It turns Markdown and Liquid templates into plain HTML files; sitemaps and JSON-LD come from the jekyll-sitemap and jekyll-seo-tag plugins. Type [Framework](https://agentreadyhtml.com/vendors/by-type/framework/) Home page [jekyllrb.com](https://jekyllrb.com/), answered HTTP 200 on 2026-11-05 Last read 5 November 2026 ## What it does for this layer - The Jekyll docs describe it as a static site generator that turns text in a markup language plus layouts into a static website. \[primary source\] [source](https://jekyllrb.com/docs/), read 5 November 2026. - The Jekyll README says it renders Markdown and Liquid into a complete static site for Apache, Nginx or another server, and that Jekyll is the engine behind GitHub Pages. \[primary source\] [source](https://github.com/jekyll/jekyll), read 5 November 2026. - Jekyll's quickstart installs the jekyll and bundler gems, scaffolds a site with \`jekyll new myblog\` and needs Ruby 2.7.0 or higher. \[primary source\] [source](https://jekyllrb.com/docs/), read 5 November 2026. - Jekyll 4.4.1, a patch restoring globbed path matching in front matter defaults, was announced on jekyllrb.com on 29 January 2025. \[primary source, 2025-01-29\] [source](https://jekyllrb.com/news/2025/01/29/jekyll-4-4-1-released/), read 5 November 2026. - On 2026-11-05 the newest entry in the jekyllrb.com news list was still the Jekyll 4.4.1 release, and the site header showed v4.4.1. \[primary source\] [source](https://jekyllrb.com/news/), read 5 November 2026. - Jekyll's custom 404 tutorial says a 404.html at the root of \_site is served automatically by GitHub Pages and by the local WEBrick server. \[primary source\] [source](https://jekyllrb.com/tutorials/custom-404-page/), read 5 November 2026. - For Apache and Nginx hosts, the Jekyll 404 tutorial adds ErrorDocument 404 /404.html to .htaccess or an error\_page 404 rule in the nginx server block. \[primary source\] [source](https://jekyllrb.com/tutorials/custom-404-page/), read 5 November 2026. - Minima is the theme \`jekyll new\` installs, and its README says it comes with the jekyll-seo-tag plugin preinstalled. \[primary source\] [source](https://github.com/jekyll/minima), read 5 November 2026. - The jekyll-seo-tag plugin adds title, description, canonical URL, Open Graph and Twitter tags, plus JSON-LD site and post metadata. \[primary source\] [source](https://github.com/jekyll/jekyll-seo-tag), read 5 November 2026. - The jekyll-sitemap plugin writes a sitemaps.org sitemap once it is listed under plugins in \_config.yml; the GitHub Pages gem ignores it if it appears only in the Gemfile. \[primary source\] [source](https://github.com/jekyll/jekyll-sitemap), read 5 November 2026. - Setting safe: true in a Jekyll \_config.yml turns off all plugins, so jekyll-sitemap writes no sitemap.xml in that mode. \[primary source\] [source](https://github.com/jekyll/jekyll-sitemap), read 5 November 2026. - jekyllrb.com says Jekyll is maintained by a core team of volunteers, and the jekyll/jekyll repository is MIT licensed. \[primary source\] [source](https://jekyllrb.com/tutorials/custom-404-page/), read 5 November 2026. - On 2026-11-05 jekyllrb.com returned 404 for /llms.txt and for a made-up path, and answered Accept: text/markdown on the home page with text/html. \[observed, 2026-11-05\] [source](https://jekyllrb.com/), read 5 November 2026. ## Products and plans | Product | What it is | Price | As of | Source | | --- | --- | --- | --- | --- | | Jekyll | Open source Ruby static site generator that turns Markdown and Liquid templates into static HTML; it powers GitHub Pages. | Free, open source; MIT license | 2026-11-05 | source | ## Standards | Standard | Status | What the vendor's pages say | Source | | --- | --- | --- | --- | | llms-txt | no statement | No statement found in the Jekyll docs, plugins page, news list or the jekyll-seo-tag and jekyll-sitemap READMEs, and the jekyllrb.com site has no llms.txt of its own. | none | | markdown-negotiation | no statement | No statement found in the Jekyll quickstart or custom 404 tutorial; Jekyll writes static files to _site and the web server decides content types. | none | | markdown-twin | no statement | No statement found in the Jekyll quickstart or plugin READMEs; Markdown sources are converted to .html files in _site. | none | | initial-html | supports | The Jekyll quickstart calls it a static site generator that uses layouts to create a static website, so pages ship as complete HTML. | source | | real-404 | partial | 404.html is served automatically by GitHub Pages and WEBrick; Apache and Nginx need ErrorDocument or error_page rules per the tutorial. | source | | vary-accept | no statement | No statement found in the Jekyll quickstart, 404 tutorial or plugin READMEs about Vary or content negotiation. | none | ## Checks on its own site | Reading | Result | Date | | --- | --- | --- | | Home page request | HTTP 200; H1 in the initial HTML: yes; 152 words; 1 JSON-LD block | 2026-11-05 | | Request with Accept: text/markdown | HTTP 200, text/html, Vary: Accept-Encoding | 2026-11-05 | | /llms.txt at the host root | HTTP 404, text/html, 5.3 KB | 2026-11-05 | | A made-up path | HTTP 404 | 2026-11-05 | | Ora score, cached | Not available: GET /api/score returned 404 DOMAIN_NOT_SCANNED | 2026-11-05 | | Cloudflare keyless scan | 7, L0 Not Ready | 2026-11-05 | ## What it does not do - Jekyll keeps no markdown copy in \_site, since every .md source page is converted to an .html file, so a page's markdown is not reachable at a URL unless you copy it as a static file. - Jekyll core writes no sitemap.xml or JSON-LD; both come from the jekyll-sitemap and jekyll-seo-tag plugins, which stop working under safe: true. ## Related pages on this site - [Frameworks in this section](https://agentreadyhtml.com/vendors/by-type/framework/) - [The Plain Fetch viewer](https://agentreadyhtml.com/viewer/) ## Sources 1. [Jekyll • Simple, blog-aware, static sites | Transform your plain text into static websites and blogs](https://jekyllrb.com/) https://jekyllrb.com/, read 5 November 2026 2. [Quickstart | Jekyll • Simple, blog-aware, static sites](https://jekyllrb.com/docs/) https://jekyllrb.com/docs/, read 5 November 2026 3. [GitHub - jekyll/jekyll](https://github.com/jekyll/jekyll) https://github.com/jekyll/jekyll, read 5 November 2026 4. [Jekyll 4.4.1 Released | Jekyll • Simple, blog-aware, static sites](https://jekyllrb.com/news/2025/01/29/jekyll-4-4-1-released/) https://jekyllrb.com/news/2025/01/29/jekyll-4-4-1-released/, read 5 November 2026 5. [News | Jekyll • Simple, blog-aware, static sites](https://jekyllrb.com/news/) https://jekyllrb.com/news/, read 5 November 2026 6. [Custom 404 Page | Jekyll • Simple, blog-aware, static sites](https://jekyllrb.com/tutorials/custom-404-page/) https://jekyllrb.com/tutorials/custom-404-page/, read 5 November 2026 7. [GitHub - jekyll/minima: Minima is a one-size-fits-all Jekyll theme for writers. · GitHub](https://github.com/jekyll/minima) https://github.com/jekyll/minima, read 5 November 2026 8. [GitHub - jekyll/jekyll-seo-tag: A Jekyll plugin to add metadata tags for search engines and social networks to better index and display your site's content. · GitHub](https://github.com/jekyll/jekyll-seo-tag) https://github.com/jekyll/jekyll-seo-tag, read 5 November 2026 9. [GitHub - jekyll/jekyll-sitemap: Jekyll plugin to silently generate a sitemaps.org compliant sitemap for your Jekyll site · GitHub](https://github.com/jekyll/jekyll-sitemap) https://github.com/jekyll/jekyll-sitemap, read 5 November 2026 Last reviewed 5 November 2026 Edition Crawl 2026-11-04 Page updated 2026-11-05 Method How the viewer reads a page, how a file is graded and how a platform is scored: [the method page](https://agentreadyhtml.com/method/).