Scrutinize is Cyrus' Path Action in Octopath Traveler. This ability allows Cyrus to obtain information from townsfolk by interrogating them. When you interrogate someone, you may be awarded one of various benefits. This Path Action is the rogue counterpart to Alfyn's Path Action, Inquire. The information and benefits obtainable from both Scrutinize and Inquire are the same; if you Scrutinize someone, you will not need to Inquire them and vice versa.
Benefits of interrogation include discounts at various stores, extra items available at shops or the location of a hidden treasure. When attempting to Scrutinize, you will be presented a percentage of success. This chance will generally be lower the greater the benefit is. If you fail to interrogate, your reputation in the current town will drop. However, you can still try and interrogate them again as long as your reputation is still good in that town (i.e you haven't failed five times).