Agent Ready HTML

The Plain Fetch viewer

In short

The viewer requests a URL the way a plain-fetch agent does: no JavaScript, one request for HTML, one for markdown, one for llms.txt and one for a path that should not exist. It shows the initial HTML on the left, the readable text on the right, and seven flags underneath.

Pre-loaded with www.wikipedia.org, read 4 November 2026. Type any public URL to run your own.

GET https://buildwithfern.com/ answered 200 with text/html, 1.4 MB (capped at 1.5 MB), read 8 November 2026, 14:12 UTC.

Permalink: /viewer/?url=https://buildwithfern.com/

The page answers a plain fetch: 6 of 7 checks found.

Initial HTML what a plain fetch receives

<!DOCTYPE html>
<html data-dpl-id="dpl_ufhVv2DZLF7mmB9yYsSAXAyAHixq" lang="en" class="gtplanar_5de4a96e-module__pvTAOq__variable berkeleymono_6aa22315-module__miwwBW__variable h-full overflow-x-clip scroll-smooth antialiased">
<head>
<meta charSet="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
[... 83 more head elements folded ...]
<link rel="service-desc" type="application/openapi+json" href="/openapi.json"/>
<link rel="describedby" type="text/plain" href="/llms.txt"/>
<link rel="sitemap" type="application/xml" href="/sitemap.xml"/>
[... 1 more head element folded ...]
<title>Fern: Docs, SDKs, and CLIs for your API
</title>
<meta name="description" content="Start with OpenAPI. Generate SDKs in multiple languages, interactive API documentation, and an agent-first CLI."/>
<link rel="canonical" href="https://buildwithfern.com"/>
[... 21 more head elements folded ...]
</head>
<body class="flex min-h-full flex-col overflow-x-clip">
<div hidden=""><!--$--><!--/$-->
</div>
<script type="application/ld+json">[... 961 characters folded ...]
</script>
<script type="application/ld+json">[... 330 characters folded ...]
</script>
<noscript>[... 140 characters folded ...]
</noscript><!--$!--><template data-dgst="BAILOUT_TO_CLIENT_SIDE_RENDERING"></template><!--/$--><!--$!--><template data-dgst="BAILOUT_TO_CLIENT_SIDE_RENDERING"></template><!--/$--><!--$!--><template data-dgst="BAILOUT_TO_CLIENT_SIDE_RENDERING"></template><!--/$-->
<script>[... 527 characters folded ...]
</script>
<header data-site-header="" class="fixed inset-x-0 top-0 z-[9999] border-b transition-colors border-transparent bg-background/80 backdrop-blur">
<div class="relative mx-auto w-full max-w-(--grid-max-w) px-6 md:px-10 xl:px-0">
<div class="flex items-center justify-between py-4">
<div class="flex items-center"><span class="inline-flex" style="-webkit-touch-callout:none"><span><a aria-label="Fern home" data-fern-logo="true" class="text-foreground" href="/">
<svg width="90" height="43" viewBox="0 0 90 43" fill="none" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Fern" overflow="visible" class="h-10 w-auto">[... 17,291 characters folded ...]
</svg></a></span></span>
<nav class="hidden items-center gap-0.5 lg:ml-6 lg:flex">
<div class="relative flex items-center gap-0.5"><button type="button" aria-haspopup="menu" aria-expanded="false" class="group/button inline-flex shrink-0 items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm whitespace-nowrap transit [... 690 characters folded ...]>Products
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-down size-3.5 transition-transform duration-200" aria-hidden="true"><path d="m6 9 6 6 6-6"></path>
</svg></button><button type="button" aria-haspopup="menu" aria-expanded="false" class="group/button inline-flex shrink-0 items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm whitespace-nowrap transit [... 690 characters folded ...]>Resources
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-down size-3.5 transition-transform duration-200" aria-hidden="true"><path d="m6 9 6 6 6-6"></path>
</svg></button><button type="button" aria-haspopup="menu" aria-expanded="false" class="group/button inline-flex shrink-0 items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm whitespace-nowrap transit [... 690 characters folded ...]>Customers
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-down size-3.5 transition-transform duration-200" aria-hidden="true"><path d="m6 9 6 6 6-6"></path>
</svg></button>
<div class="absolute top-full z-50 pt-2 pointer-events-none opacity-0" style="left:0;transform:translateY(4px);transition:opacity 200ms ease-out, transform 200ms ease-out">
<div class="ring-foreground/10 overflow-hidden rounded-xl bg-(--radix-gray-3) p-2 shadow-lg ring-1" style="width:auto;height:auto;transition:none">
<div class="relative" style="width:max-content">
<div class="transition-opacity duration-150 pointer-events-none absolute top-0 left-0 opacity-0">
<div class="bg-background flex items-stretch gap-2 rounded-lg p-2">
<div class="flex w-72 shrink-0 flex-col gap-1"><a class="flex cursor-pointer flex-col gap-1.5 rounded-sm p-4 transition-colors hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="/docs"><span class="text-p-x-small text-muted-foreground">Docs</span><span class="text-p-x-small text-foreground font-normal">Beautiful, customizable documentation websites.</span></a><a class="flex cursor-pointer flex-col gap-1.5 rounded-sm p-4 transition-colors hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="/sdks"><span class="text-p-x-small text-muted-foreground">SDKs</span><span class="text-p-x-small text-foreground font-normal">Client libraries designed by language experts.</span></a><a class="flex cursor-pointer flex-col gap-1.5 rounded-sm p-4 transition-colors hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="/cli"><span class="text-p-x-small text-muted-foreground">CLI</span><span class="text-p-x-small text-foreground font-normal">Interact with your API from the terminal.</span></a>
</div><a aria-label="Docs" class="relative block w-[28rem] shrink-0 cursor-pointer self-stretch overflow-hidden rounded-lg bg-(--radix-gray-1)" href="/docs">
<div aria-hidden="false" style="transition-property:opacity, transform, filter;transition-duration:700ms, 850ms, 750ms;transition-timing-function:cubic-bezier(0.16, 1, 0.3, 1);filter:blur(0px);will-change:opacity, transform, filter" class="absolute inset-0 translate-y-0 opacity-100"><img src="/product-cards/docs-illustration.png" alt="" aria-hidden="true" width="1206" height="600" class="absolute top-6 w-[420px] max-w-none dark:hidden left-6"/><img src="/product-cards/docs-illustration-dark.png" alt="" aria-hidden="true" width="1206" height="600" class="absolute top-6 hidden w-[420px] max-w-none dark:block left-6"/>
</div>
<div aria-hidden="true" style="transition-property:opacity, transform, filter;transition-duration:700ms, 0ms, 750ms;transition-timing-function:cubic-bezier(0.16, 1, 0.3, 1);filter:blur(14px);will-change:opacity, transform, filter" class="absolute inset-0 translate-y-[28px] opacity-0"><img src="/product-cards/sdk-illustration.png" alt="" aria-hidden="true" width="1206" height="600" class="absolute top-6 w-[420px] max-w-none dark:hidden left-1/2 -translate-x-1/2"/><img src="/product-cards/sdk-illustration-dark.png" alt="" aria-hidden="true" width="1206" height="600" class="absolute top-6 hidden w-[420px] max-w-none dark:block left-1/2 -translate-x-1/2"/>
</div>
<div aria-hidden="true" style="transition-property:opacity, transform, filter;transition-duration:700ms, 0ms, 750ms;transition-timing-function:cubic-bezier(0.16, 1, 0.3, 1);filter:blur(14px);will-change:opacity, transform, filter" class="absolute inset-0 translate-y-[28px] opacity-0"><img src="/product-cards/cli-illustration.png" alt="" aria-hidden="true" width="1206" height="600" class="absolute top-6 w-[420px] max-w-none dark:hidden left-1/2 -translate-x-1/2"/><img src="/product-cards/cli-illustration-dark.png" alt="" aria-hidden="true" width="1206" height="600" class="absolute top-6 hidden w-[420px] max-w-none dark:block left-1/2 -translate-x-1/2"/>
</div></a>
</div>
</div>
<div class="transition-opacity duration-150 pointer-events-none absolute top-0 left-0 opacity-0">
<div class="bg-background flex items-stretch rounded-lg p-2">
<div class="w-64 shrink-0 self-stretch"><a class="flex h-full cursor-pointer flex-col gap-1.5 rounded-sm p-4 hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="https://buildwithfern.com/learn"><span class="text-p-x-small text-muted-foreground">Documentation</span><span class="text-p-x-small text-foreground font-normal">Learn how to use Fern</span></a>
</div>
<div class="w-64 shrink-0 self-stretch"><a class="flex h-full cursor-pointer flex-col gap-1.5 rounded-sm p-4 hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="/careers"><span class="text-p-x-small text-muted-foreground">Careers</span><span class="text-p-x-small text-foreground font-normal">We&#x27;re hiring</span></a>
</div>
<div class="w-64 shrink-0 self-stretch"><a class="flex h-full cursor-pointer flex-col gap-1.5 rounded-sm p-4 hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="/trust"><span class="text-p-x-small text-muted-foreground">Trust center</span><span class="text-p-x-small text-foreground font-normal">SOC 2 compliant and secure</span></a>
</div>
</div>
<div class="mt-2 inline-flex"><a class="text-p-x-small text-muted-foreground hover:text-foreground flex cursor-pointer items-center gap-2 px-4 py-3 transition-colors" href="https://buildwithfern.com/agent-score"><span aria-hidden="true" class="animate-status-pulse block size-1.5 rounded-[1px] bg-[#008700] shadow-[0_0_0_2px_rgba(0,135,0,0.2)]"></span>Get your Agent-readiness score</a>
</div>
</div>
<div class="transition-opacity duration-150 pointer-events-none absolute top-0 left-0 opacity-0">
<div class="flex w-[46rem] flex-col gap-2">
<div class="bg-background flex flex-col gap-1 rounded-lg p-2"><a class="flex cursor-pointer flex-col gap-1.5 rounded-sm p-4 hover:bg-(--radix-gray-3) dark:hover:bg-(--radix-gray-4)" href="/customers"><span class="text-p-x-small text-muted-foreground">Customer stories</span><span class="text-p-x-small text-foreground font-normal">See how API teams ship Docs and SDKs with Fern.</span></a>
</div>
<div class="grid grid-cols-2 gap-2"><a aria-label="Read the ElevenLabs customer story" class="group flex cursor-pointer flex-col gap-3 rounded-lg py-4 pr-4 pl-6 transition-colors hover:bg-(--radix-gray-4) dark:hover:bg-(--radix-gray-5)" href="/customers/elevenlabs"><span class="inline-flex items-center py-1 h-5 self-start"><img src="/customers/elevenlabs/elevenlabs-light.svg" alt="ElevenLabs" class="block h-full w-auto max-w-full dark:hidden"/><img src="/customers/elevenlabs/elevenlabs-dark.svg" alt="" aria-hidden="true" class="hidden h-full w-auto max-w-full dark:block"/></span><span class="text-p-x-small text-muted-foreground group-hover:text-foreground truncate transition-colors">Unified Docs and SDKs for a billion end users.</span></a><a aria-label="Read the Auth0 customer story" class="group flex cursor-pointer flex-col gap-3 rounded-lg py-4 pr-4 pl-6 transition-colors hover:bg-(--radix-gray-4) dark:hover:bg-(--radix-gray-5)" href="/customers/auth0"><span class="inline-flex items-center py-px h-5 self-start"><img src="/customers/auth0/auth0-light.svg" alt="Auth0" class="block h-full w-auto max-w-full dark:hidden"/><img src="/customers/auth0/auth0-dark.svg" alt="" aria-hidden="true" class="hidden h-full w-auto max-w-full dark:block"/></span><span class="text-p-x-small text-muted-foreground group-hover:text-foreground truncate transition-colors">Replaced hand-written SDKs with generated ones.</span></a>
</div>
</div>
</div>
</div>
</div>
</div>
</div><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm whitespace-nowrap transition-all outline-none select-none focus-visible: [... 643 characters folded ...]>Blog</a><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm whitespace-nowrap transition-all outline-none select-none focus-visible: [... 646 characters folded ...]>Pricing</a>
</nav>
</div>
<div class="hidden items-center gap-2 lg:flex"><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm font-medium whitespace-nowrap transition-all outline-none select-none fo [... 651 characters folded ...]>Sign in</a><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center rounded-lg border bg-clip-padding text-sm font-medium whitespace-nowrap transition-all outline-none select-none focus-visible:border- [... 792 characters folded ...]>Start for free</a><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center rounded-lg border border-transparent bg-clip-padding text-sm font-medium whitespace-nowrap transition-all outline-none select-none fo [... 589 characters folded ...]>Book a demo</a>
</div>
<div class="flex items-center gap-1.5 lg:hidden"><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center border bg-clip-padding font-medium whitespace-nowrap transition-all outline-none select-none focus-visible:border-ring focus-visible: [... 768 characters folded ...]>Sign in</a><a class="group/button inline-flex shrink-0 cursor-pointer items-center justify-center border border-transparent bg-clip-padding font-medium whitespace-nowrap transition-all outline-none select-none focus-visible:border- [... 664 characters folded ...]>Book a demo</a><button type="button" aria-label="Open menu" aria-expanded="false" aria-controls="mobile-nav-panel" class="text-foreground relative ml-1 inline-flex size-8 cursor-pointer items-center justify-center rounded-md"><span aria-hidden="true" class="absolute block h-[1.5px] w-5 bg-current transition-transform duration-300 ease-out -translate-y-[6px]"></span><span aria-hidden="true" class="absolute block h-[1.5px] w-5 bg-current" style="transform:translateX(0);opacity:1;transition:transform 300ms ease-out, opacity 120ms ease-out"></span><span aria-hidden="true" class="absolute block h-[1.5px] w-5 bg-current transition-transform duration-300 ease-out translate-y-[6px]"></span></button>
</div>
</div>
</div>
</header>
<main class="flex flex-1 flex-col pt-[72px]"><img src="https://accretivemedia.go2cloud.org/aff_i?offer_id=679&amp;aff_id=1&amp;source=lp" alt="" aria-hidden="true" width="0" height="0" class="pointer-events-none invisible absolute"/>
<div class="relative mx-auto w-full max-w-(--grid-max-w) px-6 md:px-10 xl:px-0">
<div class="pt-8 pb-6 md:pt-12 md:pb-10 lg:pt-28">
<div class="flex flex-col gap-6 lg:flex-row lg:items-end lg:justify-between lg:gap-16">
<div class="lg:max-w-1/2">
<h1 class="text-h1">Upgrade your developer and agent experience
</h1>
<p class="text-p-large text-muted-foreground mt-4">Docs, SDKs, and a CLI for your API.<!-- --> <span class="inline-block">Built for the AI era.</span>
</p>
</div>
<div class="relative flex w-full items-center gap-3 lg:w-fit lg:flex-col lg:gap-0 lg:pt-16"><span aria-hidden="true" class="hero-copy-prompt__agents hidden lg:block" data-phase="float"><span class="hero-copy-prompt__agent" style="--agent-i:0;--agent-x:-84px;--agent-y:-6px;--agent-fx:-120px;--agent-fy:-70px;--agent-float:3.1s"><img src="/docs/ai-claude.svg" alt="" class="size-4 object-contain"/></span><span class="hero-copy-prompt__agent" style="--agent-i:1;--agent-x:-34px;--agent-y:-30px;--agent-fx:-60px;--agent-fy:-130px;--agent-float:3.9s"><img src="/docs/ai-gemini.svg" alt="" class="size-4 object-contain"/></span><span class="hero-copy-prompt__agent" style="--agent-i:2;--agent-x:14px;--agent-y:-4px;--agent-fx:10px;--agent-fy:-140px;--agent-float:2.7s"><img src="/docs/ai-copilot.svg" alt="" class="size-4 object-contain"/></span><span class="hero-copy-prompt__agent" style="--agent-i:3;--agent-x:58px;--agent-y:-28px;--agent-fx:80px;--agent-fy:-120px;--agent-float:3.5s"><img src="/docs/ai-chatgpt.svg" alt="" class="size-4 object-contain dark:invert"/></span><span class="hero-copy-prompt__agent" style="--agent-i:4;--agent-x:100px;--agent-y:2px;--agent-fx:130px;--agent-fy:-60px;--agent-float:3.3s"><img src="/docs/ai-cursor.svg" alt="" class="size-4 object-contain dark:invert"/></span></span><button type="button" tabindex="0" data-slot="button" aria-live="polite" class="group/button inline-flex cursor-pointer items-center border bg-clip-padding font-medium whitespace-nowrap transition-all outline-none select [... 1128 characters folded ...]><span aria-hidden="true" data-lit="true" class="beam-ring"></span><span aria-hidden="true" data-lit="true" class="beam-ring__glow"></span><span class="grid min-w-0 flex-1 text-left"><span class="truncate [grid-area:1/1] hero-copy-prompt__label-back">Set up Fern with your agent</span><span aria-hidden="true" class="invisible truncate [grid-area:1/1]">Set up Fern with your agent</span></span>
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-copy text-muted-fo [... 52 characters folded ...]>[... 135 characters folded ...]
</svg></button><span aria-hidden="true" class="flex shrink-0 -space-x-2.5 lg:hidden"><span class="border-border bg-background grid size-6 place-items-center rounded-full border"><img src="/docs/ai-cursor.svg" alt="" class="size-3 object-contain dark:invert"/></span><span class="border-border bg-background grid size-6 place-items-center rounded-full border"><img src="/docs/ai-chatgpt.svg" alt="" class="size-3 object-contain dark:invert"/></span><span class="border-border bg-background grid size-6 place-items-center rounded-full border"><img src="/docs/ai-copilot.svg" alt="" class="size-3 object-contain"/></span><span class="border-border bg-background grid size-6 place-items-center rounded-full border"><img src="/docs/ai-gemini.svg" alt="" class="size-3 object-contain"/></span><span class="border-border bg-background grid size-6 place-items-center rounded-full border"><img src="/docs/ai-claude.svg" alt="" class="size-3 object-contain"/></span></span>
</div>
</div>
</div>
</div>
<div class="relative mx-auto w-full max-w-(--grid-max-w) px-6 md:px-10 xl:border-x xl:border-border flex-1">
<div class="mx-[calc(50%-50vw)] flex w-screen justify-center">
<div class="animate-hero-demo-widen relative w-full max-w-[3200px] overflow-hidden bg-[var(--radix-gray-3)] p-0 md:p-3"><img src="/home-heroanimation-bg.avif" alt="" fetchPriority="high" decoding="async" class="animate-hero-demo-parallax absolute inset-0 size-full object-cover object-center"/>
<div class="relative mx-auto max-w-(--grid-max-w) overflow-hidden py-6 pr-0 pl-3 md:rounded-xl md:px-10 md:py-10 md:pt-3">
<div class="relative">
<div>
<div data-orientation="horizontal" data-activation-direction="none" data-slot="tabs" class="group/tabs flex gap-2 data-horizontal:flex-col mb-4 items-start justify-center pl-3 md:mb-6 md:items-center md:pl-0">
<div data-orientation="horizontal" data-activation-direction="none" role="tablist" data-slot="tabs-list" data-variant="default" class="group/tabs-list text-muted-foreground h-8 group-data-vertical/tabs:h-fit group-data-v [... 183 characters folded ...]><span aria-hidden="true" class="pointer-events-none absolute inset-0 rounded-full bg-black/15 backdrop-blur-[4px]"></span><span aria-hidden="true" class="pointer-events-none absolute inset-0 rounded-full p-px" style="background:linear-gradient(to bottom, rgba(255,255,255,0.35), rgba(255,255,255,0.25));-webkit-mask:linear-gradient(#fff 0 0)  [... 160 characters folded ...]></span>
<div class="relative flex max-w-full items-center gap-1 overflow-x-auto [-ms-overflow-style:none] [scrollbar-width:none] [&amp;::-webkit-scrollbar]:hidden" style="mask-image:linear-gradient(to right, black 0, black 24px, [... 206 characters folded ...]><span aria-hidden="true" class="pointer-events-none absolute inset-0"><span class="absolute rounded-full bg-white/20 opacity-0"></span></span><button type="button" data-active="" data-orientation="horizontal" aria-disabled="false" tabindex="-1" role="tab" aria-selected="true" id="base-ui-_R_1mpg3lfirnb_" data-composite-item-active="" data-slot="tabs-trigger" c [... 1522 characters folded ...]>Agent-friendly docs</button><button type="button" data-orientation="horizontal" aria-disabled="false" tabindex="-1" role="tab" aria-selected="false" id="base-ui-_R_2mpg3lfirnb_" data-slot="tabs-trigger" class="inline-flex items-center justify-cente [... 1478 characters folded ...]>Generated SDKs</button>
</div>
</div>
</div>
<div class="fha-root fha-tokens inter_26beb616-module__ALkf0a__variable jetbrains_mono_9db31242-module__2yF_dW__variable" data-theme="light">
<div class="fha-stack">
<div class="fha-stack-layer fha-skeleton-layer">
<div class="homepage-frame">
<div class="browser fha-skeleton">
<div class="browser-chrome">
<div class="browser-lights">
<div class="browser-light red">
</div>
<div class="browser-light yellow">
</div>
<div class="browser-light green">
</div>
</div>
</div>
<div class="browser-body">
</div>
</div>
</div>
</div>
<div class="fha-stack-layer fha-app-layer"><!--$!--><template data-dgst="BAILOUT_TO_CLIENT_SIDE_RENDERING"></template><!--/$-->
</div>

Shown with 90 long blocks (scripts, styles, long tags) folded into a marker that says how many characters they hide; line breaks added before block tags because the source is minified; the pane stops after the first 200 words; the page is 1.4 MB.

Reading view the text a plain-fetch client can extract

title: Fern: Docs, SDKs, and CLIs for your API

Upgrade your developer and agent experience

Products Resources Customers DocsBeautiful, customizable documentation websites. SDKsClient libraries designed by language experts. CLIInteract with your API from the terminal. DocumentationLearn how to use Fern CareersWe're hiring Trust centerSOC 2 compliant and secure Get your Agent-readiness score Customer storiesSee how API teams ship Docs and SDKs with Fern. Unified Docs and SDKs for a billion end users. Replaced hand-written SDKs with generated ones. Blog Pricing Sign in Start for free Book a demo Sign in Book a demo Upgrade your developer and agent experience Docs, SDKs, and a CLI for your API. Built for the AI era. Set up Fern with your agentSet up Fern with your agent Agent-friendly docs Generated SDKs Docs your developers and agents actually use, with search, MCP server, llms.txt, and AI search baked in. 20M+ Docs pages served per year 99% Reduction in time to first API call 14x AI search engagement Agents at work Developers at work Docs readDocs read by agents74,25701234567890123456789,012345678901234567890123456789 Ask Fern answersAsk Fern answers890,491012345678901234567890123456789,012345678901234567890123456789 Enhanced examplesAI-enhanced code examples10,022,41201234567890123456789,012345678901234567890123456789,012345678901234567890123456789 Docs viewedDocs viewed by developers133,213,868012345678901234567890123456789,012345678901234567890123456789,012345678901234567890123456789 SDKs generatedSDKs generated13,39201234567890123456789,012345678901234567890123456789 Docs publishedDocs published346,745012345678901234567890123456789,012345678901234567890123456789 API callsAPI calls made2,076,8680123456789,012345678901234567890123456789,012345678901234567890123456789 Docs readDocs read by agents74,25701234567890123456789,012345678901234567890123456789 Ask Fern answersAsk Fern answers890,491012345678901234567890123456789,012345678901234567890123456789 Enhanced examplesAI-enhanced code examples10,022,41201234567890123456789,012345678901234567890123456789,012345678901234567890123456789 Docs viewedDocs viewed by

88 more words follow in the initial HTML.

6 found, 1 missing, 0 notes, from 7 checks run

  • H1Found
  • 200 wordsFound
  • llms.txtFound
  • MarkdownMissing
  • Missing pathFound
  • JSON-LDFound
  • OpenAPIFound
What a plain fetch found on buildwithfern.com
CheckResultDetail
H1 in the initial HTMLFound one H1First H1: Upgrade your developer and agent experience
First 200 words in the initial HTMLFound 200 of 200 wordsThe initial HTML carries 288 words of visible text; the first 200 are marked in the left pane.
llms.txt present and linkedFound present and linked46035 bytes, 161 links. Structure grade B (5 of 6). The home page links it, which is how agents reached it in Ora's lab.
Markdown on requestMissing 200 text/htmlAccept: text/markdown returned 200 with text/html; charset=utf-8. The server ignores the header.
Status of a made-up pathFound 404/agent-ready-html-missing-path-check returned 404: a real status code for a missing page.
JSON-LD typesFound ContactPoint, Organization, PostalAddress, WebSite4 schema.org types in JSON-LD blocks on the home page: ContactPoint, Organization, PostalAddress, WebSite.
OpenAPI linkFound linkedThe home page links an OpenAPI file. 97 percent of openapi.json fetches in Ora's lab arrived through a link.

Run the full check

The viewer read one page with four requests. The full check we recommend next is Ora's scan. Its Access layer runs 42 checks worth 30 of its 100 points, among them content without JavaScript, bot detection, llms.txt, markdown on request, JSON-LD and the sitemap (Ora's check catalogue, contract 1.38.0, read 5 November 2026). Open Ora's report for buildwithfern.com.

Limits: Ora reads public URLs only, says two runs of one scan land within a couple of points without publishing repeat-scan data, and keeps the product that fixes what it finds behind a waitlist. Cloudflare's scanner at isitagentready.com is a quick free alternative, and Mintlify's score covers documentation.

What the viewer does

It sends four plain GET requests with the user agent Mozilla/5.0 (compatible; agent-readiness-crawl/1.0): the URL itself, the same URL with Accept: text/markdown, /llms.txt on the same host, and a made-up path at the root. It runs no JavaScript. The left pane is the first bytes of the HTML as text, with long scripts and styles folded into a marker that says how many characters they hide. The H1 and the first 200 words of visible text are marked in both panes. The flags under the panes say what the four responses added up to.

Limits

  • Ten seconds for all four requests together, 1.5 MB read from the home page, at most five redirects, each one checked again.
  • http and https only, default ports only. Private, local and internal addresses and names are refused.
  • Ten runs per address per minute. The counter lives in memory on the edge function, so it is per instance rather than global. Past ten you get a 429 with a Retry-After header.
  • Results are cached for 24 hours by the response headers. Nothing is written to a database: the viewer keeps the first 200 words and the extracted fields for the length of the request and keeps no page body beyond that.

What it does not tell you

A plain fetch from this server is not a real agent. Bot protection weighs the source address more than the user agent, so a page that answers 200 here can still refuse an agent, and the reverse. Ora's lab found (2026-10-19) that returning 403 to agent user agents and hiding the answer in JavaScript were the only two of 19 configurations that stopped retrieval; the viewer can see the second, and can only hint at the first. The initial HTML reference covers both. The server logs and the published crawler address ranges settle the first.

The seven flags

H1 in the initial HTML
Whether the HTML the server sends already contains an H1. It is the cheapest sign that the page does not depend on scripts to say what it is.
First 200 words in the initial HTML
Whether at least 200 words of visible text arrive in the initial HTML. Under 40 words with an app root element is flagged as a JavaScript shell.
llms.txt present and linked
Whether /llms.txt answers with a plain-text file, whether the home page links it (an anchor, a link element or a Link header), and the structure grade the index uses.
Markdown on request
Whether a request with Accept: text/markdown comes back as text/markdown. Cloudflare Radar found 3.9 percent of scanned top sites passing this at its April 2026 launch.
Status of a made-up path
Whether a path that should not exist returns 404 or 410. A 200 is a soft 404 and reads as a live page.
JSON-LD types
The schema.org types found in JSON-LD blocks on the page. Ora's lab found JSON-LD made no difference when the answer was already in the HTML.
OpenAPI link
Whether the page links an OpenAPI file, by an anchor or a service-desc link relation. It matters only for a site that ships an API.

Sources

  1. Ora: AgentReady launch post (Ora's lab findings) https://ora.ai/blog/agentready-launch, read 4 November 2026
  2. Ora check catalogue, contract 1.38.0 (132 checks, 42 in the Access layer) https://ora.ai/api/checks, read 5 November 2026
  3. Ora home page (the fixing product is behind a waitlist) https://ora.ai/, read 5 November 2026
  4. Ora: Introducing Deep Scan (repeat scans) https://ora.ai/blog/introducing-deep-scan, read 5 November 2026
  5. Ora llms.txt (public URLs only) https://ora.ai/llms.txt, read 5 November 2026
  6. Vercel: Make your site readable by AI agents https://vercel.com/kb/guide/make-your-site-readable-by-ai-agents, read 4 November 2026
  7. llms.txt proposal (llmstxt.org) https://llmstxt.org/, read 4 November 2026

Last reviewed 5 November 2026