I have about 400 million anti-covert from my planets and it doesn't seem to be killing any spies. I even trained 2 anti-covert agents and bought a merc and a strike weapon. {I used my planets for attacking so I thought that could be the reason for the bug.}
I was really looking forward to having a nice spy killing capability, well, 400 million sucks, but when you are a raider and have a 36 million attack the accounts you target aren't really going to be that powerful.
![Wink :wink:](./images/smilies/icon_wink.gif)