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A developer open-sources a 7,500-line C# integration that powers Ultima Online NPCs with a local LLM, featuring hot-reloadable config, fail-open degradation, and full access to the game world's object model.
The article questions why AI agents haven't been reliably integrated as NPC characters in video games, despite demonstrations like NVIDIA's AI-NPC from three years ago and the existence of capable open models like Gemma 4. It argues that the gaming industry's lack of effort in this area undermines claims about AI agent capabilities.
Introduces PCSP, a single RL policy conditioned on frozen LLM embeddings of persona descriptions, enabling scalable, real-time persona-traceable NPC control in life simulation games. Experiments show zero-shot persona identification and behavioral alignment, with faster inference than LLM baselines.