llms.txt Format Checker

The llms.txt specification defines a strict Markdown-based format for AI crawler hint files. A correctly formatted llms.txt starts with a single # Title heading, followed by an optional > description blockquote, then ## Section headings each containing - [Title](url) Markdown link lists.

This checker parses your file line by line and flags every format deviation: missing H1, bare URLs instead of Markdown links, text lines inside sections, duplicate headings, and empty sections. Each issue is shown with its line number and an actionable fix suggestion.

A correctly formatted llms.txt increases the chance that AI assistants, large language models, and automated crawlers correctly index and understand your site content.