---
title: "Lighthouse llms.txt audit: glossary: Agent Ready HTML"
description: "Lighthouse llms.txt audit: A Chrome Lighthouse check in the Agentic Browsing category that flags a server error on /llms.txt and marks a 404 as not applicable."
canonical: https://agentreadyhtml.com/glossary/lighthouse-llms-txt-audit/
site: "Agent Ready HTML"
last_updated: 2026-11-04
section: "Glossary"
---

# Lighthouse llms.txt audit: glossary: Agent Ready HTML

> Lighthouse llms.txt audit: A Chrome Lighthouse check in the Agentic Browsing category that flags a server error on /llms.txt and marks a 404 as not applicable.

Source: https://agentreadyhtml.com/glossary/lighthouse-llms-txt-audit/
Site: Agent Ready HTML
Last reviewed: 2026-11-04

# Lighthouse llms.txt audit

In short

A Chrome Lighthouse check in the Agentic Browsing category that flags a server error on /llms.txt and marks a 404 as not applicable. Example: Lighthouse treats a missing llms.txt as N/A because the file is optional. Related terms: Linked arrival, JSON-LD.

## Source of the example

The example in the summary above is from [developer.chrome.com](https://developer.chrome.com/docs/lighthouse/agentic-browsing/llms-txt), read 4 November 2026.

## Where it shows up on this site

-   [Method](https://agentreadyhtml.com/method/)

## Neighbouring terms

-   [Linked arrival](https://agentreadyhtml.com/glossary/linked-arrival/): A fetch of a machine file that followed a link rather than a guessed path.
-   [JSON-LD](https://agentreadyhtml.com/glossary/json-ld/): Structured data written as JSON in a script tag of type application/ld+json, using schema.org types.

## Sources

1.  [developer.chrome.com](https://developer.chrome.com/docs/lighthouse/agentic-browsing/llms-txt) https://developer.chrome.com/docs/lighthouse/agentic-browsing/llms-txt, read 4 November 2026

Last reviewed 4 November 2026

Edition

Crawl

2026-11-04

Page updated

2026-11-04

Method

How the viewer reads a page, how a file is graded and how a platform is scored: [the method page](https://agentreadyhtml.com/method/).