StardewValley-MCP

Stardew MCP Bridge adds AI companions to Stardew Valley and exposes them through the Model Context Protocol. Companions are spawned as Player 2 or 3 with custom sprites and can be controlled directly by an AI agent: move, use tools, fight, fish, farm, explore the mines and open chests. It also has autonomous modes (follow, farm, mine, fish, idle) for hands-off play.

Two parts work together. A SMAPI mod written in C# runs inside the game, pairing each visible companion NPC with a hidden shadow farmer that performs the real game mechanics, and exchanges state with the second part through JSON files. A Node.js MCP server exposes 25 tools over stdio, 13 global tools and 12 direct-control tools for player mode, such as getting surroundings, moving to a tile, using a tool, attacking and casting a fishing rod. Auto-combat can be toggled because real-time fighting is too fast for model round trips. You build the server with npm, add it to your MCP client config and launch the game with SMAPI.