The add_xp function in narrat increases the xp of the player in a specified skill
add_xp [skillId] [xp]
See the skills system guide to know more
skillCheckChoice: choice: "Should we try jumping over a fence?" roll aSkillCheck agility 70 "Try jumping!" hideAfterRoll: success: "You graciously jump over a fence, hair blowing in the wind, and land in a heroic pose that would be used in a movie trailer." talk inner idle "Woo I did it!!!" add_xp agility 5 failure: "You try jumping over the fence, but not high enough. You stab your toe against the fence and fall head first into a puddle of mud. It's also in the background of a tiktok a passerby was filming now." talk inner idle "Ouch!"
In this example, the player gains agility XP because they succeeded at jumping over the fence.