Recall Intrigues  (SourceSpymaster's Handbook pg. 9)

You can identify the feats and features of various classes with successful Appraise check when you observe them in action.

Check: You can attempt a skill check to identify a feat or class feature when you observe it in use, similar to how Spellcraft can be used to identify a spell. The feat or class feature must have some observable effect in order for you to attempt the check. For example, you can’t see the internal determination of Iron Will, so this ability can’t identify that feat. In general, if a feat or class feature creates a noticeable effect (such as the extra attack from using Cleave) or has a variable modifier a character must choose to use (such as Arcane Strike, Combat Expertise, or Enlarge Spell), it can be identified. If it creates a static bonus (such as Dodge or Lightning Reflexes), there’s no telltale sign to give it away.

A Knowledge skill roll is typically required to do more than identify the feature's specifics varies and will depend on the type of feat or class feature used.

Task DC
Determine race and age 10
Determine gender 15
Determine alignment 15 + creature’s HD†
Determine class         20 + creature’s HD†
Determine level or HD 25 + creature’s HD†


|Task                                                                |  Associated Knowledge Skill | DC  |
Identify a feature from a class that grants arcane or psychic spells         Arcana                  10 + class level when feature is granted*
Identify a feature from a class with access to the druid or ranger spell list Nature                  10 + class level when feature is granted*
Identify a feature from another class that grants divine spells                 Religion          10 + class level when feature is granted*
Identify a feature from any other class                                         Culture                  10 + class level when feature is granted*
Identify a combat feat being used Local 10 + character’s level
Identify a metamagic feat being used Arcana 10 + character’s level
Identify a teamwork feat being used Nobility 10 + character’s level
Identify any other feat being used Local 15 + character’s level
* Add 10 to the DC if the class is a prestige class.