Major LLMs Ignore Markdown Files — HTML Remains the Strict Ingestion Vector for Citations

Agentic SEO best practices dictate hosting .txt and .md files to feed LLM parsers.

A 30-million-source analysis disproves this tactic, reveals Sean.

Gemini and major AI engines ignore Markdown and plain text files for citation sourcing, strictly prioritizing standard HTML as the ingestion vector.

Furthermore, the parser data shows LLMs extract 44% of citations from the first 30% of an article.

The engines prioritize short, hyper-focused pages over comprehensive monolithic guides for source material.

Google formally confirms this crawler logic, notes Laura Iancu.

John Mueller verified on LinkedIn that Gemini entirely bypasses Markdown files, cementing HTML as the required format for AI trust signals.