I continue to really hate agents (only because of 615/620 orders) in Fourth Age and how they start to spoil the game once they gain the ascendancy.
What makes it especially difficult to deal with them is that nation messages aren’t enough to provide you with who’s agents are targeting you. And the only thing you can do to fight off enemy agents if they are stronger than yours, is to try to double them by putting your emissaries in harms way.
I’d like to see a new spell called “Scry Companions” or perhaps “Perceive Companions”. The difficulty to cast would be hard, of course. When cast, it has a chance to name one or more of the others in the specified character’s company, partly perhaps based on their stealth. The character named need not be the company commander. Perhaps success is also based on the stealth rank of the target character. Say Sauron cast it on Gandalf, he wouldn’t find out much about the Nine Walkers.
You can bet Sauron cast it again and again to figure out who was traveling with Gandalf!
P.S. Perhaps it would also have a chance of identifying the company commander.