Agentic Browsing false negative: PSI reports missing H1 and links in llms.txt although both are present

FAQ

• Yes, my issue is not about variability or throttling.
• Yes, my issue is not about a specific accessibility audit (file with axe-core instead).
• Yes, my issue is not answered by other FAQs.

URL

https://stemotoys.bg/

What happened?

PageSpeed Insights consistently reports that our llms.txt does not follow recommendations.

The Agentic Browsing audit reports:

“The file is missing the required H1 heading” “The file does not appear to contain any links”

However, the publicly accessible llms.txt clearly contains both.

It starts with:

STEMOTOYS

and contains multiple standard Markdown links, for example links to our homepage, Tarot category, catalogue, articles and contact page.

The file is publicly accessible at: https://stemotoys.bg/llms.txt

The tested website is: https://stemotoys.bg/

What did you expect?

The llms.txt audit should pass because the file contains an H1 and multiple Markdown links.

What have you tried?

Run a new PageSpeed Insights test for stemotoys.bg. Open the Agentic Browsing section. The result is 2/3. The llms.txt audit reports that there is no H1 and no links. Open /llms.txt directly in a browser. The H1 and Markdown links are present.

The issue reproduces on both Mobile and Desktop.

We first observed the same audit messages in a PageSpeed Insights report on August 20, 2026. After explicitly updating the llms.txt to include an H1 and Markdown links, a completely new PageSpeed Insights test on August 25, 2026 still reports exactly the same missing-H1 and missing-links errors.

This appears to be a false negative in the Agentic Browsing llms.txt audit rather than an issue with the file itself.

This may be related to Lighthouse issue #17082, although our symptom is different: the audit successfully identifies /llms.txt but incorrectly reports that its actual Markdown content lacks an H1 and links.

PageSpeed Insights reproduction:

https://pagespeed.web.dev/analysis/https-stemotoys-bg/qc8d5t2i19?form_factor=desktop

How were you running Lighthouse?

PageSpeed Insights

Lighthouse Version

13.4.1

Chrome Version

No response

Node Version

No response

OS

N/A - reproduced in PageSpeed Insights on both Mobile and Desktop

Relevant log output

Agentic Browsing: 2/3

llms.txt audit:
The file is missing the required level-one heading (e.g. "# Heading").
The file appears to have no links.

Public file:
https://stemotoys.bg/llms.txt

The public llms.txt currently starts with:
# STEMOTOYS

It also contains multiple standard Markdown links, including:
[STEMOTOYS](https://stemotoys.bg/)
[Карти Таро](https://stemotoys.bg/category/karti-taro)
[Каталог](https://stemotoys.bg/category/catalogue)
[Статии](https://stemotoys.bg/blog)
[Контакти](https://stemotoys.bg/contacts)

The same false-negative result is reproduced in fresh PageSpeed Insights runs for both Mobile and Desktop.