Each tool works only from what you tell it or paste into it. The symptom checker cannot see your server; the decoder reads one snippet, not the site it came from; the readiness check scores your answers, not your controls. They are built to point you at the right next step quickly, and to be honest about where that step needs someone with access.
If a tool turns up an active loader, a persistence layer, or a control you cannot evidence, the guides linked from each result explain how to confirm it safely — and where a cleanup or an audit is the right answer, the result says so plainly.