Who else is talking to this agent's audience, and how often they collide.

An operator turning on a programme needs to see the overlap BEFORE choosing a group and a priority; without it the only feedback available is a customer receiving two messages. So this uses the same window and the same claim definition the runner arbitrates on (see services/exclusivity), and the number read here is the number the runner would act on.

An agent with no group still gets a meaningful preview: the workspace default window is used, which is what the pair would be arbitrated with the moment somebody groups them.