Signals
Individual signals, what they are worth, and what happens when they are missing.
One signal at a time: what it is, why it weighs what it weighs, and what a failure actually costs.
Answer-first is 25 words, and three tools had to agree on how to count them
In September 2026 two checkers in this portfolio reported different word counts for the same page. The cause was a function nobody had looked at in a year, and fixing it changed how every number in the family is produced.
The heaviest signal on the whole scale is one line of a text file
Sixteen of the seventy-five points in the AI Discoverability reading come down to whether robots.txt lets AI crawlers in. No other single signal in the registry is worth that much, and most people have not read theirs since 2023.
Why a good site from 2019 reads hot for search and cold for AI
The most common shape in the readings is a site scoring in the eighties for Search Visibility and the forties for AI Discoverability. Nothing it did was wrong when it was built. That is the whole problem.