I scan websites for a living. 42% of domains in my most recent batch returned zero valid JSON-LD. 82% served no llms.txt file. Finance, healthcare, government, e-commerce. The regulated industries.
Every retrieval pipeline assumes the source delivers structured data. I stopped assuming and started measuring. Five signals, one binary result, a CSV for batch runs. Below is the tool and every line of reasoning behind it.
What the tool checks
Five signals determine whether a domain provides the minimum infrastructure an automated system can rely on:
JSON-LD. Does the homepage contain valid application/ld+json blocks? Which Schema.org types?
