Sentry Action

Sentry Rating determines your ability to defend against enemy spy missions and hide your gold from enemies on the battlefield. Opponents will be able to see your gold if their Spy Action is more than twice your Sentry Action.

Formula
Sentry Rating = (P + U) * 1.6^C

Where P is the total power of your sentry tools

U is the number of unequipped sentries you control

C is your Covert level (1-15)