RPG MCP Server

An immersive Role-Playing Game server built on the Model Context Protocol (MCP), designed to work with AI assistants like Claude to create interactive storytelling experiences.

Features

🎮 Game Tools

The server provides 6 core tools for building and managing RPG games:

1. createGame - Initialize a new RPG game

   • Set up initial game state (characters, world, inventory, etc.)
   • Auto-generates unique game ID

2. updateGame - Update game state

   • Supports nested field paths (e.g., characters[0].level, world.location)
   • Real-time change tracking with Delta system

3. getGame - Retrieve current game state

   • Access complete game state at any time

4. progressStory - Advance the narrative

   • Record current situation and events
   • Manage narrative flow

5. promptUserActions - Present action choices to users

   • Generate interactive UI
   • Web-based action selection interface

6. selectAction - Process user selections

   • Apply chosen actions to game state
   • Automatically record game history

🎯 User Interaction

Basic Game Flow

createGame → progressStory → promptUserActions → selectAction → updateGame → progressStory → ...

Interactive UI

• Web-based Selection Interface: Beautiful UI automatically generated with story progression
• Real-time Change Display: Visual feedback for recent changes via Delta system
• Game History: Automatically saves last 10 situation-choice records

Example Game Scenario

// 1. Create Game
{
  "title": "Wizard's Adventure",
  "characters": [
    {"name": "Elara", "level": 1, "hp": 100, "mp": 50, "class": "Wizard"}
  ],
  "world": {"location": "Magic Academy", "time": "morning", "weather": "sunny"},
  "inventory": [{"name": "Magic Staff", "type": "weapon"}]
}

// 2. Progress Story
"Elara discovers an ancient spellbook in the academy library..."

// 3. Present Choices
["Read the spellbook", "Tell the professor", "Leave it where it is"]

// 4. Update game state after user selection
"characters[0].favorability": +5

MCP Client Requirements

Essential Requirements

• MCP Protocol Support: MCP SDK 0.5.0 or higher
• MCP-UI Integration: HTML resource rendering support
• Tool Execution: Ability to execute all 6 game tools

Recommended Clients

• Claude Desktop (officially supported)
• MCP-UI compatible clients
• Alternative: synaptic-flow and other MCP-UI compatible clients

Claude Desktop Setup

Step 1: Locate Configuration File

Platform-specific config file locations:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%/Claude/claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

Step 2: Edit Configuration File

{
  "mcpServers": {
    "rpg-game-server": {
      "command": "npx",
      "args": ["rpg-mcp-server"],
      "env": {
        "NODE_ENV": "production"
      }
    }
  }
}

Step 3: Restart Claude Desktop

Completely quit and restart Claude Desktop to apply the configuration.

Step 4: Test the Setup

Hi! Can you create a fantasy RPG game for me?

Installation & Usage

Global Installation (Recommended)

npm install -g rpg-mcp-server

Local Development

git clone <repository-url>
cd rpg-mcp-server
npm install
npm run build
npm start

Testing with MCP Inspector

npm run inspector

Technology Stack

• TypeScript - Type safety and developer experience
• MCP SDK - Model Context Protocol implementation
• MCP-UI - Interactive web UI generation
• Node.js - Runtime environment

System Requirements

• Node.js 18.0.0 or higher
• npm 9.0.0 or higher
• MCP-compatible client

License

MIT License - see LICENSE file for details.