Mueller Tested Markdown for AI Crawlers. Only SEO Tools Showed Up. The Hypothesis Collapsed.

Google's John Mueller tested serving Markdown versions of webpages to make content easier for AI crawlers to consume. He found that the only bots requesting his Markdown files were from SEO tools, not major AI bots. There is no evidence that serving Markdown improves AI citations or AI search rankings.

This demonstrates what I call 'format fetishism.' Practitioners assume that because AI models train on Markdown, serving Markdown must confer an advantage. It does not. Crawling, indexing, and ranking remain separate processes from model training. Google's systems parse HTML. They do not need your help simplifying it. The lesson is to test assumptions before building infrastructure around them.

Google's John Mueller shared his direct testing experience and asked the SEO community whether anyone had seen a major AI bot actually request Markdown. No evidence emerged from the discussion.