Can AI assistants read cshl.edu?

Measured on 2026-09-19 by asking the site 5 times — once as a browser, once as each of the 4 crawlers that feed ChatGPT, Claude, Perplexity, Gemini, Meta AI, Apple Intelligence and Doubao — and comparing what came back. The AI-training opt-out tokens that never crawl are read from robots.txt instead.

What each crawler got back

Cloudflare answers for this domain. Where a crawler above is refused while robots.txt allows it, the rule is applied by that edge, not written by the site — see how often each edge does this.

What to change, in order

1. Publish llms.txt
   llms.txt is missing, so an assistant has to discover the site by following links. llms.txt is the emerging convention for telling an assistant which pages actually matter.
2. Mark the content with <main>
   The content-reachability check scores 3/100: with no <main> or <article> landmark, or with most of the page outside it, an assistant reads the navigation and the footer at the same cost as the text it came for.
3. Fix the plain structure: one <h1>, a title, a description, alt text
   The structure check scores 41/100. These are the cheapest signals on the page and the first ones an assistant uses to decide what the site is.
4. 2 crawlers are named and refused in robots.txt — a deliberate choice
   ClaudeBot, GPTBot are blocked by a rule that names them. Nothing to fix here: this page records what is true, not what should be. It is listed so the deliberate part of the block is not confused with the accidental part above.

Get told if this changes

One email only when a measured crawler flips on cshl.edu, served to refused or back. No schedule, no newsletter; double opt-in, one-click stop.

The checks

• Answers AI agents like it answers people100%
• Readable without JavaScript100%
• robots.txt lets the crawlers in60%
• Facts in JSON-LD100%
• Content reachable, not buried3%
• Publishes a map of itself70%
• Plain structure41%

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<a href="https://aivis.lumnika.com/ai-readiness/cshl.edu"><img src="https://aivis.lumnika.com/ai-readiness/cshl.edu/badge.svg" alt="AI readability"></a>