Description

NPCAgent begins with three NPCs waking up in a town containing a park, a home, and a cafe. There are no quests or story flags to guide them—just $10 to start, an energy bar that steadily drains, and memories that disappear overnight unless they record them in a diary before going to sleep. From this simple setup, their lives unfold one decision at a time. Each NPC is driven by a large language model answering a single question every turn: “What do you do next?” They work behind the cafe counter, buy meals, strike up conversations, tell lies, and hold grudges. They can fall for one another, have children, grow old, and die. None of those developments are scripted; they emerge from the characters’ decisions rather than a predetermined storyline. Money is the only deliberately imposed pressure, and the town’s single paying job makes it a powerful force. Monopolize that source of income, and the others have to come to you to eat. NPCAgent explores how a few basic constraints can shape relationships, dependence, and entire lifetimes without a quest log telling anyone what should happen next.