Minecraft MCP Server

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<img width="2063" height="757" alt="image" src="https://github.com/user-attachments/assets/3f0f0438-f079-4226-90bd-87b9e1311d19" />

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[!IMPORTANT] Currently supports Minecraft version 1.21.11. Newer versions may not work with this MCP server, but we will add support as soon as possible.

https://github.com/user-attachments/assets/6f17f329-3991-4bc7-badd-7cde9aacb92f

A Minecraft bot powered by large language models and Mineflayer API. This bot uses the Model Context Protocol (MCP) to enable Claude and other supported models to control a Minecraft character.

<a href="https://glama.ai/mcp/servers/@yuniko-software/minecraft-mcp-server"> <img width="380" height="200" src="https://glama.ai/mcp/servers/@yuniko-software/minecraft-mcp-server/badge" alt="mcp-minecraft MCP server" /> </a>

Monorepo layout

This repository is a pnpm workspace. The build engine is split into focused packages:

Package	Name	Role
mcp/	@mcbuild/mcp	MCP server — the LLM-facing tool surface and orchestrator (evolved from the original bot server)
engine/	@mcbuild/engine	Build engine — deterministic, rule-driven parametric geometry pipeline
renderer/	@mcbuild/renderer	Camera / renderer — turns extracted block data into multi-angle PNGs
protocol/	@mcbuild/protocol	Shared contract — JSON-RPC types + zod schemas shared by the MCP server and the plugin
plugin/	(Java)	Paper server plugin — commits blocks directly into the world (not a Node workspace)

The overarching architecture, phased roadmap, and rule system are documented in BUILD_ENGINE_PLAN.md.

Common workspace scripts (run from the repo root): pnpm build, pnpm test, pnpm typecheck, pnpm lint, and pnpm dev:mcp.

Legacy (bot backend)

The sections below describe the original Mineflayer player-bot backend. It remains the default backend (--backend=bot) and works exactly as before; it is retained as a fallback through milestone M5 (see BUILD_ENGINE_PLAN.md §9). The bot server now lives in the mcp/ package.

Prerequisites

• Git
• Node.js (>= 20.10.0)
• A running Minecraft game (the setup below was tested with Minecraft 1.21.8 Java Edition included in Microsoft Game Pass)
• An MCP-compatible client. Claude Desktop will be used as an example, but other MCP clients are also supported

Getting started

This bot is designed to be used with Claude Desktop through the Model Context Protocol (MCP).

Run Minecraft

Create a singleplayer world and open it to LAN (ESC -> Open to LAN). Bot will try to connect using port 25565 and hostname localhost. These parameters could be configured in claude_desktop_config.json on a next step.

MCP Configuration

Make sure that Claude Desktop is installed. Open File -> Settings -> Developer -> Edit Config. It should open installation directory. Find file with a name claude_desktop_config.json and insert the following code:

{
  "mcpServers": {
    "minecraft": {
      "command": "npx",
      "args": [
        "-y",
        "github:yuniko-software/minecraft-mcp-server",
        "--host",
        "localhost",
        "--port",
        "25565",
        "--username",
        "ClaudeBot"
      ]
    }
  }
}

Double-check that right --port and --host parameters were used. Make sure to completely reboot the Claude Desktop application (should be closed in OS tray).

Running

Make sure Minecraft game is running and the world is opened to LAN. Then start Claude Desktop application and the bot should join the game.

It could take some time for Claude Desktop to boot the MCP server. The marker that the server has booted successfully:

<img width="885" height="670" alt="image" src="https://github.com/user-attachments/assets/ccbb42f8-6544-462c-8ac1-8af13ddfcddd" />

You can give bot any commands through any active Claude Desktop chat. You can also upload images of buildings and ask bot to build them 😁

Don't forget to mention that bot should do something in Minecraft in your prompt. Because saying this is a trigger to run MCP server. It will ask for your permissions.

Using Claude Sonnet could give you some interesting results. The bot-agent would be really smart 🫡

Example usage: shared Claude chat

Available Commands

Once connected to a Minecraft server, Claude can use these commands:

Movement

• get-position - Get the current position of the bot
• move-to-position - Move to specific coordinates
• look-at - Make the bot look at specific coordinates
• jump - Make the bot jump
• move-in-direction - Move in a specific direction for a duration

Flight

• fly-to - Make the bot fly directly to specific coordinates

Inventory

• list-inventory - List all items in the bot's inventory
• find-item - Find a specific item in inventory
• equip-item - Equip a specific item

Block Interaction

• place-block - Place a block at specified coordinates
• dig-block - Dig a block at specified coordinates
• get-block-info - Get information about a block
• find-blocks - Find one or more nearby blocks of a specific type

Furnace

• smelt-item - Smelt items using a furnace-like block

Entity Interaction

• find-entity - Find the nearest entity of a specific type

Communication

• send-chat - Send a chat message in-game
• read-chat - Get recent chat messages from players

Game State

• detect-gamemode - Detect the gamemode on game

Contributing

Feel free to submit pull requests or open issues for improvements. All refactoring commits, functional and test contributions, issues and discussion are greatly appreciated!

To get started with contributing, please see CONTRIBUTING.md.

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