Two changes make Trackingplan's answers clearer about what it can and cannot see.
Which plans receive traffic from a website. Ask which of your plans receive traffic from a site. Trackingplan answers from the sites each plan has received, subdomains included, and names the matching hostnames and the last day each was seen. It lists up to 50 plans and says how many it searched. Only hits sent from a page count: a server-side tag container reports no page host. A question about one plan's figures for a site is still answered on that plan.
Destinations that aren't connected. If you name a destination that is not in the plan, and no connected integration reaches it, Trackingplan says so in one line before anything else: what that destination receives is not in this data. Pixel or consent rows may still show pages contacting it.
Who it is for: agencies and teams with several plans, and anyone asking about a tool Trackingplan doesn't read.
Where: any chat in the panel. More on asking questions: Threads.