LLMs.txt
A file at your site root that tells AI crawlers which content to index and how to understand your store — the AI equivalent of robots.txt.
What it means
LLMs.txt is a community-proposed convention where a site publishes a plain-text file at /llms.txt listing its key content in a format optimized for LLM consumption. Unlike robots.txt (which blocks crawlers), llms.txt guides AI systems toward your most citable content. It includes page URLs, summaries, and context that helps LLMs understand what your site is about before crawling. A Shopify store with a well-structured llms.txt makes it easier for ChatGPT, Perplexity, and Gemini to understand the product catalog and surface it in recommendations.
Why it matters for Shopify
A properly configured llms.txt is often the single highest-leverage technical change a Shopify merchant can make for AI visibility.