Servuo

TL;DR I open-sourced the integration that puts a local LLM behind the NPCs on my Ultima Online (ServUO) shard. It’s about 7,500 lines of C# that drop into a shard’s Scripts/Custom/ directory and compile at boot — no separate build, no service to deploy. This post is the code-level companion to the story version of the project: how config hot-reloads, how the model client marshals async results back onto the game thread, how the LLM is kept entirely out of the simulation loop, and how a deterministic allowlist makes a non-deterministic model safe to put in a stateful world. The whole thing is fail-open: if the model is slow, down, or wrong, the NPC silently degrades to a vanilla ServUO NPC. Code is on GitHub: ZoltyMat/uo-llm-npc. ...