Also, how do you get game state back from an LLM response? If an LLM decides an NPC is a blacksmith and promises to make a sword for a player, and that function

Also, how do you get game state back from an LLM response? If an LLM decides an NPC is a blacksmith and promises to make a sword for a player, and that functionality isn't even in the game, how do you handle the player responses?