llms.txt
noun

Definition:
An emerging proposed file, modeled after robots.txt, designed to declare a website’s permissions or restrictions specifically for large language models (LLMs) that scrape or ingest web content for training or inference. Its purpose is to give publishers control over how their content is used by AI systems.

Usage:
“The company added an llms.txt file to signal that their articles shouldn’t be used for LLM training.”

Compare:
robots.txt