The MCP is a compiler, not a brain. The LLM does the strategic reasoning; this server does the things that must be exact.
Why not just ask the LLM?
Ask an AI assistant for a Guild Wars build without this server and you typically get: a plausible-sounding bar with a skill that does not exist, an attribute spread that exceeds the point budget, stats quoted from a decade-old balance patch — and a template code that decodes to garbage when you paste it in-game, because codes are bit-packed and cannot be hallucinated character-by-character.