TL;DR of the paper, generated automatically.

CrowdDirector lets you steer a running Unity crowd with plain-language instructions.

• How it works: an LLM runs only when an instruction is added or changed, not every tick.
• Checks: a scene validator confirms the referenced entities and actions exist before accepting.
• Runtime: a graph neural network picks each agent's action each tick, trained offline.
• Results: follows instructions more closely than handwritten rules, with no repeated LLM calls.