Do Glob Pattern Rules only apply via explicit tagging?

When creating rules that “Apply to Specific Files” via glob patterns, at what point in the Agent’s workflow are those glob patterns triggered to apply the rule?

I’ve noticed that hovering over the Context Usage symbol at the end of a session, I only am seeing my Always Applied rules. In those sessions, I do not explicitly @ a file/folder that matches a glob pattern, but the Agent does end up modifying files that would. This is the same whether using Plan or Agent mode.

Does Cursor apply those rules when those files are modified, or do I have to know in advanced to @ them in the prompt for them to be applied?