← Analyze a URL · Tested sites

www.arstechnica.com

Report from 9/21/2026, 11:04:44 AM https://www.arstechnica.com
Latest run · lab, cold cache
73
9/21/2026
28-day score · p75 · the standard
73
29 runs
CRR100%latest
SSD87%latest
TC1803 toklatest
TTFUT189 ms28-day p75

Scored by v3 · source-of-truth hashes: score db860d6ac94e · thresholds e94f8b33e500 — verifiable against the canonical scorer.

The 28-day score is the p75 of nightly runs — the stable number to cite. Deterministic metrics (CRR/SSD/TC) show their latest value (they move only when the site changes); timing (TTFUT) and answer-fidelity (AF) are smoothed by 28-day p75 — the same lab-vs-field split Core Web Vitals uses. Synthetic daily measurement, not real-user field data.

Core Agent Vitals badge  Embed this badge

Show your agent-readiness score anywhere — it links back to this report.

[![Core Agent Vitals](https://agentvitals.dev/badge/arstechnica.com.svg)](https://agentvitals.dev/results?url=https%3A%2F%2Fwww.arstechnica.com)
<a href="https://agentvitals.dev/results?url=https%3A%2F%2Fwww.arstechnica.com"><img src="https://agentvitals.dev/badge/arstechnica.com.svg" alt="Core Agent Vitals" height="20"></a>
What AI tells your customers about youAgent confidence: LOW
✅Business nameArs Technica
✅CategoryOrganization
🟡Price$875 · guessed from page text (no structured data)
❌Locationnot found
❌Hoursnot found
❌Productsnot found
🟡DescriptionNews and reviews, covering IT, AI, science, space, health, gaming, cybersecurity, tech policy, computers, mobile devices, and operating systems. · guessed from page text (no structured data)

An agent is likely to fabricate missing details rather than say “I don’t know”. 2/7 applicable facts come from machine-readable structured data.

DesktopMobile
73
Overall score
weighted CAV (0–100)
PASS
0–4950–8990–100

Metrics

100%
CRR Content Recovery Good
0.87
SSD Semantic Signal Density Good
1,803 tok
TC Token Cost Good
179 ms
TTFUT Time to First Useful Token N/A

Token Cost breakdown

Where the page's tokens go (≈13,771 across regions). Most tokens are real content — the agent isn't paying much for chrome.

Content
76.2% · 10,500
Chrome (nav / header / footer)
6.7% · 923
Boilerplate (cookie / ad)
4% · 544
Other
13.1% · 1,804

Final screenshot

Final screenshot of https://www.arstechnica.com

Diagnostics

No issues found — this page is well-prepared for agents.

Rendered profile: headless

Agent Discoverability 77/100 · Needs Work

Access & discovery checks — separate from the gated CAV metrics above. Click an issue for business impact, what we measured, and how to fix. · Take the Agent Readiness course →

Agent files & endpoints

✗ llms.txt Absent at /llms.txt and /.well-known/llms.txt Learn →
✗ robots.txt (AI bots) Blocks: ClaudeBot, Claude-Web, anthropic-ai, PerplexityBot, Google-Extended, Applebot-Extended, CCBot, Bytespider, cohere-ai, Diffbot, FacebookBot, YouBot, Amazonbot Learn →
✓ sitemap.xml Found at /sitemap.xml Learn →
✓ JSON-LD structured data Types: WebSite, WebPage, Organization Learn →
~ agents.json Absent (emerging standard) Learn →
~ WebMCP endpoint Absent (emerging standard) Learn →
~ OpenAPI / API docs No OpenAPI/Swagger found Learn →

Issues (5)

✗ robots.txt allows AI bots high impact Blocks: ClaudeBot, Claude-Web, anthropic-ai, PerplexityBot, Google-Extended, Applebot-Extended, CCBot, Bytespider, cohere-ai, Diffbot, FacebookBot, YouBot, Amazonbot

Business impact If robots.txt blocks AI crawlers you are invisible to ChatGPT, Claude and Perplexity — they skip you and recommend a competitor instead.

What we measured We read /robots.txt and test it against 16 AI user-agents (GPTBot, ClaudeBot, PerplexityBot, …) for a Disallow that blocks them.

How to fix Allow major AI bots to public content; restrict only private paths (/admin, /api).

Learn how to implement →

User-agent: GPTBot
Allow: /
Disallow: /admin/

Spec: https://platform.openai.com/docs/gptbot

✗ llms.txt present high impact Absent at /llms.txt and /.well-known/llms.txt

Business impact llms.txt is the robots.txt for AI: it tells agents what your site is, what matters, and where to find it. Without it AI guesses — and guessing means inaccurate recommendations and lost visibility.

What we measured We fetch /llms.txt and /.well-known/llms.txt and validate the spec (H1 title + a one-line blockquote summary). We also note /llms-full.txt (your full content as Markdown).

How to fix Create /llms.txt with a short summary + key pages; optionally /llms-full.txt with full content in Markdown.

Learn how to implement →

# Your Site
> One-line description for AI agents.

## Key pages
- /products — catalog
- /pricing — plans
- /docs — documentation

Spec: https://llmstxt.org

~ agents.json discovery low impact Absent (emerging standard)

Business impact agents.json describes what your site can DO for agents (services, endpoints, capabilities) — an emerging discovery standard. Early adopters get native agent integration.

What we measured We check /agents.json and /.well-known/agents.json for a valid configuration.

How to fix Publish /agents.json describing your site's capabilities and actions.

Learn how to implement →

Spec: https://github.com/wild-card-ai/agents-json

~ WebMCP endpoint low impact Absent (emerging standard)

Business impact WebMCP lets agents call actions on your site directly (book, buy, query) instead of scraping the DOM. Early adopters get native AI-agent interoperability.

What we measured We check /.well-known/webmcp and /webmcp.json for a valid actions array.

How to fix Add a WebMCP endpoint exposing your key actions to agents.

Learn how to implement →

Spec: https://webmcp.org

~ API documentation low impact No OpenAPI/Swagger found

Business impact Programmatic agents prefer a typed API. An OpenAPI/Swagger spec lets them integrate without scraping.

What we measured We probe /openapi.json, /swagger.json, /api-docs and /.well-known/openapi.json.

How to fix Publish an OpenAPI spec at a well-known path.

Learn how to implement →

Spec: https://www.openapis.org/

Passed audits (7)

✓ No CAPTCHA wall✓ No content-blocking cookie wall✓ Machine-readable prices✓ No login wall on public content✓ Structured data (JSON-LD)✓ XML sitemap present + fresh✓ Server response (TTFB)

Transport & Trust (SEC 1.0.0)

HTTPS, HSTS, CSP, sniffing, referrer and CORS posture. Diagnostic only — this does not affect the CAV score. A security header does not make a page more legible to an agent, so scoring it would reward a CDN toggle that changes nothing an agent can recover. We measure it and say so.

61Transport posture (0–100, unscored)
2pass
3warn
0fail
Per-header findings (6)
HeaderEvidence
✅ HTTPSserved over HTTPS
⚠️ HSTSmax-age=2592000 is below the 180-day baseline
⚠️ Content-Security-Policyscript-src allows 'unsafe-inline'
✅ X-Content-Type-Optionsnosniff
⚠️ Referrer-Policyno referrer-policy header (browser default applies)
➖ CORS exposureno CORS headers on the document (normal for an HTML page)
Full profile — how to improve · unused JS · network · timing

How to improve

highSplit the heaviest unused bundlehighest leverage

pubads_impl.js — 212 KiB transferred, 60.5% unused (third-party)

EvidenceCDP JS coverage: 128 KiB of this bundle is never executed on load.
Impact~-128 KiB transfer; lower Token Cost + faster agent parse.
Effort30–90 min
FixDynamic-import() the below-the-fold parts of pubads_impl.js, or drop unused dependencies. It is third-party — lazy-load or remove it.
highCut third-party weight

googletagmanager.com — 929 KiB, 6 requests, 89 ms main-thread

EvidenceThird-party is 98.5% of total transfer (183 requests); googletagmanager.com is the largest.
ImpactFewer bytes + main-thread stalls before your content settles for an agent.
Effort1–3 h
FixLazy-load, self-host, or remove googletagmanager.com; defer non-critical third-party scripts.
mediumCut total transfer weight

4.3 MB total

Evidence4.3 MB transferred.
ImpactCheaper, faster fetch on slow links.
Effort1–3 h
FixEnable Brotli, serve WebP/AVIF images, defer non-critical resources.

Third-party impact

183 third-party requests · 4379 KiB (98.5% of transfer) · 162 ms main-thread — code an agent must also fetch/run before your content settles. Fewer, lazier third-parties = faster, cheaper agent reads.

Third-party domainReqsTransferMain-thread
googletagmanager.com6929 KiB89 ms
2mdn.net1789 KiB—
arstechnica.net27563 KiB47 ms
permutive.app2511 KiB19 ms
doubleclick.net16297 KiB7 ms
facebook.net2254 KiB—
conde.digital7178 KiB—
tiktok.com8163 KiB—
condenastdigital.com4138 KiB—
amazon-adsystem.com699 KiB—
googlesyndication.com1295 KiB—
hotjar.com263 KiB—

Wasted JavaScript (by bundle)

Transfer-accurate — each bundle's transfer size × its unused %, ranked by wasted bytes (the biggest code-splitting wins). Unused JS also inflates Token Cost (TC).

BundleTransferUnusedWasted
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202609040101/pubads_impl.js 3P212 KiB60.5%128 KiB
https://www.googletagmanager.com/gtag/js?id=AW-816822159 3P149 KiB74.8%112 KiB
https://www.googletagmanager.com/gtag/js?id=G-LRHY7JG2PW&cx=c&gtm=4e69b1h1 3P173 KiB49.6%86 KiB
https://www.googletagmanager.com/gtm.js?id=GTM-NLXNPCQ 3P184 KiB42.1%77 KiB
https://www.googletagmanager.com/gtag/js?id=AW-977997567 3P149 KiB51.5%77 KiB
https://www.googletagmanager.com/gtag/js?id=AW-816822159&cx=c&gtm=4e69b1h1 3P149 KiB49.8%74 KiB
https://www.googletagmanager.com/gtm.js?id=GTM-PVBXQMCR&gtm=4e69b1h1 3P124 KiB55.4%69 KiB
https://analytics.tiktok.com/i18n/pixel/static/main.MWRhY2RiNmFkMQ.js 3P115 KiB57.8%67 KiB
https://cdn.arstechnica.net/wp-content/themes/ars-v9/public/js/app.248aea.js 3P73 KiB83.8%61 KiB
https://ads-static.conde.digital/production/cns/builds/ars-technica/prebid.min.js 3P107 KiB49.9%54 KiB
https://c.amazon-adsystem.com/aax2/apstag.js 3P93 KiB52.7%49 KiB
https://connect.facebook.net/en_US/fbevents.js 3P108 KiB43.1%46 KiB
https://connect.facebook.net/signals/config/228464857488266?v=2.9.400&r=stable&domain=arstechnica.com&hme=8b8307c54baef8e2e163adfde73264db23075e760039a5d475486087d4cb12ef&ex_m=115%2C228%2C166%2C26%2C80%2C81%2C158%2C76%2C75%2C11%2C176%2C100%2C20%2C150%2C138%2C45%2C83%2C88%2C146%2C171%2C178%2C31%2C17%2C30%2C18%2C32%2C33%2C34%2C36%2C54%2C159%2C85%2C123%2C22%2C24%2C50%2C46%2C48%2C47%2C93%2C102%2C106%2C121%2C157%2C160%2C52%2C122%2C28%2C25%2C130%2C77%2C42%2C162%2C161%2C163%2C154%2C152%2C29%2C41%2C65%2C120%2C173%2C78%2C21%2C125%2C91%2C74%2C23%2C95%2C96%2C127%2C94%2C148%2C147%2C151%2C107%2C172%2C175%2C40%2C55%2C124%2C53%2C8%2C4%2C5%2C7%2C6%2C3%2C101%2C112%2C180%2C179%2C195%2C242%2C82%2C256%2C255%2C254%2C14%2C27%2C39%2C61%2C114%2C67%2C10%2C71%2C108%2C109%2C110%2C116%2C141%2C37%2C35%2C143%2C144%2C145%2C140%2C139%2C167%2C84%2C170%2C168%2C169%2C56%2C66%2C134%2C19%2C174%2C51%2C305%2C306%2C307%2C304%2C320%2C345%2C235%2C224%2C68%2C225%2C223%2C348%2C339%2C58%2C236%2C118%2C142%2C90%2C132%2C60%2C131%2C137%2C136%2C64%2C72%2C70%2C164%2C86%2C87%2C126%2C43%2C38%2C59%2C62%2C111%2C177%2C1%2C135%2C16%2C133%2C12%2C2%2C63%2C103%2C15%2C73%2C69%2C129%2C99%2C98%2C182%2C183%2C104%2C105%2C9%2C113%2C181%2C57%2C155%2C97%2C89%2C79%2C128%2C117%2C49%2C156%2C0%2C92%2C149%2C153%2C165%2C44%2C119%2C13%2C184 3P146 KiB28.9%42 KiB
https://script.hotjar.com/modules.e762be2b6b709245aabb.js 3P57 KiB72.5%41 KiB
https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js 3P74 KiB50.3%37 KiB

Network

203Requests
4445 KiBTransferred
55Scripts
98.5%3rd-party
0Long tasks
Script (55)
3090 KiB
Image (44)
1079 KiB
Font (3)
88 KiB
Fetch (50)
67 KiB
Document (18)
41 KiB
Stylesheet (4)
29 KiB
Other (4)
25 KiB
XHR (16)
21 KiB
Ping (9)
5 KiB
Heaviest requests (30)
URLTypeStatusTransfer
https://s0.2mdn.net/simgad/8878978678158517129Image200789 KiB
https://bd1cec50-00d1-4ce9-9572-785857419a1e.edge.permutive.app/1dfc40bb-d155-4f15-970e-99450dbfa0e2-web.jsScript200511 KiB
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202609040101/pubads_impl.jsScript200212 KiB
https://www.googletagmanager.com/gtm.js?id=GTM-NLXNPCQScript200184 KiB
https://www.googletagmanager.com/gtag/js?id=G-LRHY7JG2PW&cx=c&gtm=4e69b1h1Script200173 KiB
https://www.googletagmanager.com/gtag/js?id=AW-816822159&cx=c&gtm=4e69b1h1Script200149 KiB
https://www.googletagmanager.com/gtag/js?id=AW-816822159Script200149 KiB
https://www.googletagmanager.com/gtag/js?id=AW-977997567Script200149 KiB
https://connect.facebook.net/signals/config/228464857488266?v=2.9.400&r=stable&domain=arstechnica.com&hme=8b8307c54baef8e2e163adfde73264db23075e760039a5d475486087d4cb12ef&ex_m=115%2C228%2C166%2C26%2C80%2C81%2C158%2C76%2C75%2C11%2C176%2C100%2C20%2C150%2C138%2C45%2C83%2C88%2C146%2C171%2C178%2C31%2C17%2C30%2C18%2C32%2C33%2C34%2C36%2C54%2C159%2C85%2C123%2C22%2C24%2C50%2C46%2C48%2C47%2C93%2C102%2C106%2C121%2C157%2C160%2C52%2C122%2C28%2C25%2C130%2C77%2C42%2C162%2C161%2C163%2C154%2C152%2C29%2C41%2C65%2C120%2C173%2C78%2C21%2C125%2C91%2C74%2C23%2C95%2C96%2C127%2C94%2C148%2C147%2C151%2C107%2C172%2C175%2C40%2C55%2C124%2C53%2C8%2C4%2C5%2C7%2C6%2C3%2C101%2C112%2C180%2C179%2C195%2C242%2C82%2C256%2C255%2C254%2C14%2C27%2C39%2C61%2C114%2C67%2C10%2C71%2C108%2C109%2C110%2C116%2C141%2C37%2C35%2C143%2C144%2C145%2C140%2C139%2C167%2C84%2C170%2C168%2C169%2C56%2C66%2C134%2C19%2C174%2C51%2C305%2C306%2C307%2C304%2C320%2C345%2C235%2C224%2C68%2C225%2C223%2C348%2C339%2C58%2C236%2C118%2C142%2C90%2C132%2C60%2C131%2C137%2C136%2C64%2C72%2C70%2C164%2C86%2C87%2C126%2C43%2C38%2C59%2C62%2C111%2C177%2C1%2C135%2C16%2C133%2C12%2C2%2C63%2C103%2C15%2C73%2C69%2C129%2C99%2C98%2C182%2C183%2C104%2C105%2C9%2C113%2C181%2C57%2C155%2C97%2C89%2C79%2C128%2C117%2C49%2C156%2C0%2C92%2C149%2C153%2C165%2C44%2C119%2C13%2C184Script200146 KiB
https://privacy.condenastdigital.com/fides.js?property_id=FDS-MIKT8M&Script200136 KiB
https://www.googletagmanager.com/gtm.js?id=GTM-PVBXQMCR&gtm=4e69b1h1Script200124 KiB
https://analytics.tiktok.com/i18n/pixel/static/main.MWRhY2RiNmFkMQ.jsScript200115 KiB
https://connect.facebook.net/en_US/fbevents.jsScript200108 KiB
https://ads-static.conde.digital/production/cns/builds/ars-technica/prebid.min.jsScript200107 KiB
https://c.amazon-adsystem.com/aax2/apstag.jsScript20093 KiB
https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.jsScript20074 KiB
https://cdn.arstechnica.net/wp-content/themes/ars-v9/public/js/app.248aea.jsScript20073 KiB
https://cdn.arstechnica.net/wp-content/uploads/2026/09/sfcrop1-1-768x432-1789413216.jpgImage20064 KiB
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