llms.txt links resolve

What it checks

The extension reads /llms.txt and collects its Markdown links. It then requests up to the first 8 links that point to the same origin as the site, using HEAD and falling back to GET when the server refuses HEAD. A link passes if it returns a successful response.

Links to other domains are listed but never requested. Fetching them would send a request from your browser to whatever address the site put in its file, and whether a third party’s page works says nothing about the site being scanned.

If the site has no readable /llms.txt, this check does not apply, so a site is not charged for a missing file twice. Whether the file exists is covered by llms.txt present.

Results

Status	When
Pass	Every sampled same-origin link resolves
Warn	One or more sampled same-origin links do not resolve
N/A	There is no readable /llms.txt, it has no Markdown links, or all its links point to other domains

How to fix

Fix or remove the broken links. An agent that reads llms.txt treats it as an index, so every dead link costs it a wasted request. The evidence panel lists each broken link with the status it returned.

Point the file at your own documents. Links to other domains are not checked.

Support by agent and browser

Announced means the vendor’s own docs or announcement say so. Published is the date on the vendor’s own page, where it has one. Checked is the last time our weekly research found that page still saying so.

No agent or browser has announced anything about this yet.

No evidence yet27

• ChatGPT
• Claude
• Gemini
• Perplexity
• Copilot
• Meta AI
• ChatGPT Atlas
• Comet
• Dia
• Gemini in Chrome
• Edge Copilot Mode
• Claude Code
• Cursor
• Codex
• GitHub Copilot
• Windsurf
• CCBot
• Applebot
• Amazonbot
• Bytespider
• Cohere
• Mistral
• DuckAssist
• Chrome
• Edge
• Firefox
• Safari

Names and marks belong to their owners and are used only to identify products. None of these vendors is affiliated with Sitebulb. Spotted something out of date? Send a correction.

Adoption on the top 100 sites

15%

15 of 99 measured sites implement it

Scanned 23 Oct 2026 with the Sitebulb Labs extension, against the Tranco list (tranco-56Z8N). 1 sites couldn’t be measured (bot challenge or timeout) and are left out of the share.

Sites implementing it15

1. #2 cloudflare.com
2. #32 github.com
3. #37 fastly.com (via fastly.net)
4. #55 wordpress.org
5. #60 digicert.com
6. #61 adobe.com
7. #76 opera.com (with warnings)
8. #87 qq.com
9. #101 wordpress.com
10. #106 sentry.io
11. #120 samsung.com (with warnings)
12. #122 intuit.com (with warnings)
13. #132 dropbox.com
14. #153 webex.com
15. #158 kaspersky.co.uk (via kaspersky.com) (with warnings)

Overview

2/9

Speculative

Specified, but little evidence anything uses it yet.

How this rating is worked out2 of 9 points

Factor	Points	Why
Vendor support	0 / 3	0 vendors supporting, 0 partly or planned
Top-100 adoption	2 / 3	15% of measured sites
Spec maturity	0 / 3	Community proposal

8 or more points is Established, 5 to 7 is Gaining traction, 2 to 4 is Speculative and under 2 is Stalled. A feature is also Stalled when more vendors have said no than yes. Read the spec.

Community insights

No community insights for this feature yet.

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