--- title: "GitHub Pages: vendor profile: Agent Ready HTML" description: "GitHub Pages, a host or CDN: 1 of 6 standards stated as supported, 8 sourced facts, dated plans and what it does not do." canonical: https://agentreadyhtml.com/vendors/github-pages/ site: "Agent Ready HTML" last_updated: 2026-11-05 section: "Vendors" --- # GitHub Pages: vendor profile: Agent Ready HTML > GitHub Pages, a host or CDN: 1 of 6 standards stated as supported, 8 sourced facts, dated plans and what it does not do. Source: https://agentreadyhtml.com/vendors/github-pages/ Site: Agent Ready HTML Last reviewed: 2026-11-05 # GitHub Pages: vendor profile In short GitHub Pages runs no server code and sets no custom response headers, so markdown by Accept header needs a CDN in front, and a client-rendered app reaches agents as its empty shell. A 404.html or 404.md in the repository becomes the not-found page. Pages is free with GitHub Free for public repositories; private ones need a paid plan. ## At a glance **standards.txt** github-pages ```text llms-txt = no statement markdown-negotiation = no statement markdown-twin = no statement initial-html = partial real-404 = supports vary-accept = no statement ``` 1 supports, 1 partial or announced, 4 no statement. **GitHub Pages** Host, CDN or edge product Static hosting from a GitHub repository with an optional Jekyll build; a 404.html or 404.md in the repository becomes the custom not-found page, and server headers cannot be set. Type [Host, CDN or edge product](https://agentreadyhtml.com/vendors/by-type/host-or-cdn/) Operator, as the facts below state it GitHub Home page [pages.github.com](https://pages.github.com/), answered HTTP 200 on 2026-11-05 Last read 5 November 2026 ## What it does for this layer - GitHub describes Pages as a static site hosting service that takes HTML, CSS and JavaScript files from a repository, optionally runs a build process and publishes a website. \[primary source\] [source](https://docs.github.com/en/pages/getting-started-with-github-pages/what-is-github-pages), read 5 November 2026. - GitHub Pages is available in public repositories on GitHub Free, and in public and private repositories on GitHub Pro, Team, Enterprise Cloud and Enterprise Server. \[primary source\] [source](https://docs.github.com/en/pages/getting-started-with-github-pages/what-is-github-pages), read 5 November 2026. - A custom not-found page on GitHub Pages is a file named 404.html or 404.md in the publishing source. \[primary source\] [source](https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site), read 5 November 2026. - Jekyll is the static site generator with built-in support on GitHub Pages; it builds Markdown and HTML into a site using layouts and Liquid templates. \[primary source\] [source](https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/about-github-pages-and-jekyll), read 5 November 2026. - GitHub Pages runs a set of Jekyll plugins that are on by default and cannot be disabled, including jekyll-titles-from-headings, jekyll-relative-links and jekyll-readme-index. \[primary source\] [source](https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/about-github-pages-and-jekyll), read 5 November 2026. - Published GitHub Pages sites may be no larger than 1 GB, deployments time out after 10 minutes, and sites have a soft bandwidth limit of 100 GB a month. \[primary source\] [source](https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits), read 5 November 2026. - GitHub Pages answers rate-limited requests with HTTP 429 and an informative HTML body. \[primary source\] [source](https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits), read 5 November 2026. - GitHub's terms on the limits page say Pages is not meant to run an online business, an e-commerce site or commercial software as a service. \[primary source\] [source](https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits), read 5 November 2026. ## Products and plans | Product | What it is | Price | As of | Source | | --- | --- | --- | --- | --- | | GitHub Pages | Static site hosting from a repository, with a built-in Jekyll build or a custom GitHub Actions workflow. | Free; Included with GitHub Free for public repositories; private repositories need a paid GitHub plan | 2026-11-05 | source | ## Standards | Standard | Status | What the vendor's pages say | Source | | --- | --- | --- | --- | | llms-txt | no statement | GitHub Pages serves an llms.txt only if the repository contains one; no generator in the pages read. | none | | markdown-negotiation | no statement | No Accept-header handling in the pages read; Pages offers no custom response headers. | none | | markdown-twin | no statement | No markdown copy feature in the pages read. | none | | initial-html | partial | Pages serves the static files in the repository or the Jekyll build, so content is in the HTML when the source is static. | source | | real-404 | supports | A 404.html or 404.md in the source becomes the custom not-found page. | source | | vary-accept | no statement | Not covered in the pages read. | none | ## Checks on its own site | Reading | Result | Date | | --- | --- | --- | | Home page request | HTTP 200; H1 in the initial HTML: yes; 688 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, 9.2 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 - GitHub Pages offers no way to set custom response headers or rewrite by Accept header in the pages read, so markdown negotiation needs a CDN in front. - GitHub Pages runs no server code, so a site built as a client-rendered app reaches agents as its empty shell. ## Related pages on this site - [Hosts, CDNs and edge products in this section](https://agentreadyhtml.com/vendors/by-type/host-or-cdn/) - [The Plain Fetch viewer](https://agentreadyhtml.com/viewer/) ## Sources 1. [GitHub Pages: home page](https://pages.github.com/) https://pages.github.com/, read 5 November 2026 2. [What is GitHub Pages? - GitHub Docs](https://docs.github.com/en/pages/getting-started-with-github-pages/what-is-github-pages) https://docs.github.com/en/pages/getting-started-with-github-pages/what-is-github-pages, read 5 November 2026 3. [Creating a custom 404 page for your GitHub Pages site - GitHub Docs](https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site) https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site, read 5 November 2026 4. [About GitHub Pages and Jekyll - GitHub Docs](https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/about-github-pages-and-jekyll) https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/about-github-pages-and-jekyll, read 5 November 2026 5. [GitHub Pages limits - GitHub Docs](https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits) https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits, 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/).