--- title: "Stainless: vendor profile: Agent Ready HTML" description: "Stainless, a docs platform: 3 of 6 standards stated as supported, 12 sourced facts, dated plans and what it does not do." canonical: https://agentreadyhtml.com/vendors/stainless/ site: "Agent Ready HTML" last_updated: 2026-11-05 section: "Vendors" --- # Stainless: vendor profile: Agent Ready HTML > Stainless, a docs platform: 3 of 6 standards stated as supported, 12 sourced facts, dated plans and what it does not do. Source: https://agentreadyhtml.com/vendors/stainless/ Site: Agent Ready HTML Last reviewed: 2026-11-05 # Stainless: vendor profile In short Stainless builds a docs site as a static Astro and Starlight project and serves each page as markdown by Accept header or at /index.md. A team first needs one Stainless-generated SDK. Its marketing site answered unknown paths with its homepage and 200 on 2026-11-05. Free covers up to 5 generators. ## At a glance **standards.txt** stainless ```text llms-txt = no statement markdown-negotiation = supports markdown-twin = supports initial-html = supports real-404 = no statement vary-accept = no statement ``` 3 supports, 0 partial or announced, 3 no statement. **Stainless** Docs platform SDK generator vendor whose Docs Platform (public beta since March 2026) builds each docs site as a static Astro and Starlight project with API and SDK reference, a markdown copy of every page at /index.md, and AI chat; it needs at least one Stainless SDK. Type [Docs platform](https://agentreadyhtml.com/vendors/by-type/docs-platform/) Home page [www.stainless.com](https://www.stainless.com/), answered HTTP 200 on 2026-11-05 Last read 5 November 2026 ## What it does for this layer - Stainless labels its Docs Platform a public beta and warns of breaking API changes before version 1.0. \[primary source\] [source](https://www.stainless.com/docs/docs-platform/), read 5 November 2026. - Each Stainless Docs Platform site is a standalone Astro project in a Git repository the customer controls, and Astro outputs static HTML and CSS with opt-in interactive islands. \[primary source\] [source](https://www.stainless.com/docs/docs-platform/), read 5 November 2026. - The Stainless Docs Platform writes a markdown version of every page on the site, reached by adding a .md extension to the URL. \[primary source\] [source](https://www.stainless.com/docs/docs-platform/), read 5 November 2026. - Stainless's public beta post of 2026-03-12 says every docs page is served as markdown through the Accept header or at /index.md, with SDK method signatures in the endpoint pages. \[primary source, 2026-03-12\] [source](https://www.stainless.com/blog/stainless-docs-public-beta/), read 5 November 2026. - Stainless first opened its Docs Platform in early access on 2025-11-05, describing it as built on Astro with hosting on Cloudflare. \[primary source, 2025-11-05\] [source](https://www.stainless.com/blog/stainless-docs-early-access/), read 5 November 2026. - The Stainless Docs Platform currently requires at least one Stainless-generated SDK; Stainless says that requirement should go away by 1.0. \[primary source, 2026-03-12\] [source](https://www.stainless.com/blog/stainless-docs-public-beta/), read 5 November 2026. - Stainless docs sites can move off Stainless hosting to any static host such as Cloudflare Pages, Vercel, Netlify or GitHub Pages, given @stainless-api/docs 1.0.0-beta.143 or newer. \[primary source\] [source](https://www.stainless.com/docs/docs-platform/hosting-and-deploys/), read 5 November 2026. - Stainless Docs uses Starlight's Pagefind index for guide search and offers optional Algolia search over the API reference; the beta post adds a vector search layer. \[primary source\] [source](https://www.stainless.com/docs/docs-platform/hosting-and-deploys/), read 5 November 2026. - Stainless's pricing page counts a docs site as one generator; the Free plan at $0 covers up to 5 generators, and the docs feature list includes custom domain, AI markdown rendering, AI chat and password-protected docs. \[primary source, 2026-11-05\] [source](https://www.stainless.com/pricing), read 5 November 2026. - Stainless says its SDK generator serves API companies including Anthropic, Cloudflare and OpenAI. \[vendor claim\] [source](https://www.stainless.com/blog/stainless-docs-early-access/), read 5 November 2026. - On 2026-11-05 Stainless's own docs at www.stainless.com/docs (generator meta Astro v6.3.1 and Starlight v0.38.5) served /docs/docs-platform/index.md as text/markdown at 6,256 bytes but answered Accept: text/markdown on the page URL with HTML. \[observed, 2026-11-05\] [source](https://www.stainless.com/docs/docs-platform/), read 5 November 2026. - On 2026-11-05 a made-up path under www.stainless.com/docs/ returned HTTP 404, while the marketing site returned HTTP 200 with its homepage for unknown paths, including /llms.txt. \[observed, 2026-11-05\] [source](https://www.stainless.com/docs/docs-platform/hosting-and-deploys/), read 5 November 2026. ## Products and plans | Product | What it is | Price | As of | Source | | --- | --- | --- | --- | --- | | Stainless Docs Platform | Astro and Starlight based docs framework and hosting that unifies API reference, SDK reference and MDX guides, in public beta. | Free tier, paid plans above it; Free plan $0 for up to 5 generators (an SDK, docs site or MCP server each); Starter, Pro and Enterprise prices were not in the fetched HTML. | 2026-11-05 | source | ## Standards | Standard | Status | What the vendor's pages say | Source | | --- | --- | --- | --- | | llms-txt | no statement | No llms.txt statement found in the Docs Platform overview, hosting or configuration pages or the two launch posts; Stainless's own docs serve /docs/llms.txt. | none | | markdown-negotiation | supports | Beta post says every page is available as markdown via the Accept header; Stainless's own docs returned HTML for Accept: text/markdown on 2026-11-05. | source | | markdown-twin | supports | Markdown version of every page by adding .md (or /index.md) to the URL. | source | | initial-html | supports | Sites are Astro projects that generate static HTML; hosting docs call them multi-page static sites. | source | | real-404 | no statement | No 404 statement found in the routing or hosting pages; an unknown path under www.stainless.com/docs/docs-platform/ answered 404 on 2026-11-05. | none | | vary-accept | no statement | Stainless's docs pages do not cover response headers, and www.stainless.com/docs sent no Vary header on 2026-11-05. | none | ## Checks on its own site | Reading | Result | Date | | --- | --- | --- | | Home page request | HTTP 200; H1 in the initial HTML: yes; 211 words; 0 JSON-LD blocks | 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 200, text/html, 683 KB | 2026-11-05 | | A made-up path | HTTP 200 | 2026-11-05 | | Ora score, cached | 58, grade C | 2026-09-10 | | Cloudflare keyless scan | 20, L1 Basic Web Presence | 2026-11-05 | ## What it does not do - Stainless's Docs Platform pages make no llms.txt promise, even though Stainless's own docs serve /docs/llms.txt. ## Related pages on this site - [Docs platforms in this section](https://agentreadyhtml.com/vendors/by-type/docs-platform/) - [The Plain Fetch viewer](https://agentreadyhtml.com/viewer/) ## Sources 1. [Stainless: home page](https://www.stainless.com/) https://www.stainless.com/, read 5 November 2026 2. [Stainless Docs Platform overview | Stainless](https://www.stainless.com/docs/docs-platform/) https://www.stainless.com/docs/docs-platform/, read 5 November 2026 3. [Stainless - Blog - Stainless Docs Platform: now in public beta](https://www.stainless.com/blog/stainless-docs-public-beta/) https://www.stainless.com/blog/stainless-docs-public-beta/, read 5 November 2026 4. [Stainless - Blog - Stainless Docs Platform is now available in early access](https://www.stainless.com/blog/stainless-docs-early-access/) https://www.stainless.com/blog/stainless-docs-early-access/, read 5 November 2026 5. [Hosting and deploys | Stainless](https://www.stainless.com/docs/docs-platform/hosting-and-deploys/) https://www.stainless.com/docs/docs-platform/hosting-and-deploys/, read 5 November 2026 6. [Stainless - Pricing - Get the pricing that’s right for your API.](https://www.stainless.com/pricing) https://www.stainless.com/pricing, 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/).