Google Adds LLMs.txt To Search Developer Docs

12/03/25
Source: Search Engine Roundtable by barry@rustybrick.com (Barry Schwartz). Read the original article

TL;DR Summary of Google’s Unexpected Use of LLMs.txt Files

Google has publicly stated that the LLMs.txt file is not used and may be unnecessary, yet surprisingly, Google itself has uploaded an LLMs.txt file on its Search Central portal. This has sparked speculation about whether Google is endorsing the file or simply trolling the SEO community. Observers note that the LLMs.txt presence appears to be a broader platform-wide implementation rather than a targeted move by Search Central.

Optimixed’s Overview: Unpacking Google’s Surprising Deployment of LLMs.txt Files Across Its Developer Platforms

Background on LLMs.txt and Google’s Stance

The LLMs.txt file is a proposed method for websites to communicate with large language models (LLMs) about content usage permissions. Despite Google’s previous statements discouraging its use and suggesting webmasters should noindex it, recent developments reveal a twist.

Google’s Unexpected Upload of LLMs.txt

  • Google has uploaded an LLMs.txt file on the Search Central portal, contradicting earlier public messaging.
  • This discovery was first noted by Lidia Infante, who questioned Google’s Search Liaison John Mueller on social media.
  • John Mueller’s ambiguous response fueled speculation about whether this was an endorsement or a playful ruse.

Broader Platform-Wide Implementation

Further examination shows that LLMs.txt files are not limited to Search Central. They appear on various Google developer sites such as:

This indicates a platform-wide approach rather than an initiative specifically driven by Search Central, suggesting a new direction or internal experiment about how Google manages LLM content permissions.

Implications for SEO and Content Creators

The unexpected presence of LLMs.txt files on Google’s own properties raises questions about the future role of this protocol. Content creators and SEO professionals should:

  • Monitor official Google announcements for clarity on LLMs.txt usage and guidelines.
  • Consider the potential evolving relationship between site content, LLMs, and indexing preferences.
  • Stay informed on how major platforms like Google might influence or adopt such protocols moving forward.