# legible.crossinginto.ai > A machine-legibility auditor: it grades how readable a website is to AI systems. Point it at a URL and it runs five checks — llms.txt, robots.txt, sitemap, homepage metadata, and structured data — scores each, and returns a letter grade out of 100, streamed in the open. An offering from crossinginto.ai. This file is the tool describing itself, in the very format it grades you on. ## Use it - [Auditor](https://legible.crossinginto.ai/): Paste a URL, watch the checks land one by one, and read your grade. - [API — audit (streaming)](https://legible.crossinginto.ai/api/audit): POST JSON `{"url","options":{"force"}}`; responds with a streamed NDJSON log — a `check` line per completed check, ending in a `done` event carrying the full Report. - [API — report (curl)](https://legible.crossinginto.ai/api/report): GET `?url=https://example.com` returns the Report as JSON, cache-first. ## What it checks - [llms.txt (25 pts)](https://llmstxt.org): A curated Markdown map at your root telling models what you publish and where it lives. - [robots.txt (20 pts)](https://legible.crossinginto.ai/): Whether AI crawlers get an explicit, intentional stance — the audit scores clarity, never allow-versus-block. - [Sitemap (15 pts)](https://legible.crossinginto.ai/): A parseable sitemap.xml, at the root or via robots, so nothing worth reading goes undiscovered. - [Metadata (25 pts)](https://legible.crossinginto.ai/): Homepage title, meta description, canonical link, and OpenGraph tags. - [Structured data (15 pts)](https://legible.crossinginto.ai/): JSON-LD schema that names what your pages actually are. ## Related - [llms.txt generator](https://llmstxt.crossinginto.ai): The sibling tool — it assembles the llms.txt this auditor grades you on. Fail the first check and we point you here. - [crossinginto.ai](https://crossinginto.ai): Crossing into machine intelligence — governance, provenance, memory. This tool is an offering under that brand. - [The llms.txt proposal](https://llmstxt.org): The convention behind the highest-weighted check. - [Built by Matthew Williamson at Clevyr](https://crossinginto.ai): Design and engineering.