Why would a short Markdown file prompt Google to question its value, while Anthropic publishes it on its official website, Shopify enables it by default for merchants, and more AI infrastructure companies move to support it? The debate around llms.txt may seem like a minor format dispute. In reality, it reflects a larger shift: how brands are read, understood, and recommended by large language models. As part of Tec-Do’s GEO Expert Insights series, this article examines an emerging signal in the market and what it means for brand visibility in the age of generative engines. Yesterday, a friend in marketing...