Engines lift answers from pages they can parse. A buried definition, a skipped heading, or a page that is mostly chrome is enough for the assistant to skip you or invent the answer.
This check fetches one URL and reads extractability: heading outline, whether the opening paragraph names the subject, schema.org coverage, Q&A blocks, lists and tables, freshness, author markup, and how much of the HTML is real copy versus chrome. It does not run a language model.
The result is a ranked list of fixes, each naming the element and the change. It is a count of work on this page today, not a score out of 100, and not a trend.