facts-check
Facts check: one list of approved facts, every page compared with it
Two checks in one run, both read-only, both from the same reading of the live pages: facts (every figure against the approved list, steps 1 to 4 below) and positioning (every page against the term it owns, see "The positioning check"). Either can be used alone.
A site that has grown for years says the same thing in many places: the client count on the home page, in the about page, in a press page, in the meta description and in the structured data. They drift. One page says 500 clients and another 700, and an AI assistant that reads both may quote either, or neither. People rarely notice, because nobody reads 400 pages side by side. A script does.
The skill has two halves. People decide what is true: the facts list, with a source and an owner for every value. The script compares: it reads the live pages and reports every number that names a fact and differs from the list. It never edits a page and never decides which of two figures is right.