Foundry VTT MCP Bridge

Connect Foundry VTT to Claude Desktop for AI-powered campaign management through the Model Context Protocol (MCP).

Overview

The Foundry MCP Bridge enables natural AI conversations with your Foundry VTT game data:

Quest Creation: Create quests from prompts that incorporate what exists in your world and journals
Character Management: Query character stats, abilities, and information
Compendium Search: Find items, spells, and creatures using natural language
Content Creation: Generate actors, NPCs, and quest journals from simple prompts
Scene Information: Access current scene data and world details
Dice Coordination: Interactive roll requests with player targeting
Campaign Management: Multi-part quest and campaign tracking

This project was built with the assistance of Claude Code. If you like this project, consider supporting it on Patreon.

Installation

Prerequisites

Foundry VTT v13
Claude Desktop with MCP support
Windows (for automated installer) or Node.js 18+ for manual installation

Option 1: Windows Installer (Recommended)

Download the latest FoundryMCPServer-Setup.exe from Releases
Run the installer - it will:
- Install the MCP server with bundled Node.js runtime
- Configure Claude Desktop automatically
- Optionally install the Foundry module to your VTT installation
Restart Claude Desktop
Enable "Foundry MCP Bridge" in your Foundry Module Management

Option 2: Manual Installation

Install the Foundry Module

Open Foundry VTT v13
Select install module in the Foundry Add-ons menu
At the bottom of the window, add the Manifest URL as: https://github.com/adambdooley/foundry-vtt-mcp/blob/master/packages/foundry-module/module.json and click install
Enable "Foundry MCP Bridge" in Module Management

Install the MCP Server

# Clone repository
git clone https://github.com/adambdooley/foundry-vtt-mcp.git
cd foundry-vtt-mcp

# Install dependencies and build
npm install
npm run build

Configure Claude Desktop

Add this to your Claude Desktop configuration (claude_desktop_config.json) file:

{
  "mcpServers": {
    "foundry-mcp": {
      "command": "node",
      "args": ["path/to/foundry-vtt-mcp/packages/mcp-server/dist/index.js"],
      "env": {
        "FOUNDRY_HOST": "localhost",
        "FOUNDRY_PORT": "31415"
      }
    }
  }
}

Starting Claude Desktop will start the MCP Server.

Getting Started

Start Foundry VTT and load your world
Open Claude Desktop
Chat with Claude about your currently loaded Foundry World

Example Usage

Once connected, ask Claude Desktop:

"Show me my character Clark's stats"
"Find all CR 12 humanoid creatures for an encounter"
"Create a quest about investigating missing villagers"
"Roll a stealth check for Tulkas"
"What's in the current Foundry scene?"

Features

20 MCP Tools that allow Claude to interact with Foundry
Character Management: Access stats, abilities, and inventory
Enhanced Compendium Search: Instant filtering by CR, type, abilities, and more
Content Creation: Generate actors, NPCs, and quest journals
Campaign Management: Multi-part quest tracking with progress dashboards
Interactive Dice System: Send different dice roll requests to players from Claude
Actor Ownership: Manage player permissions for characters and tokens
GM-Only: MCP Bridge only connects to Game Master users

Architecture

Claude Desktop ↔ MCP Protocol ↔ MCP Server ↔ WebSocket ↔ Foundry Module ↔ Foundry VTT

Foundry Module: Provides secure data access within Foundry VTT
MCP Server: External Node.js server handling Claude Desktop communication
No API Keys Required: Uses your existing Claude Desktop subscription

Security & Permissions

GM-Only Access: All functionality restricted to Game Master users
Configurable Permissions: Control what data Claude can access and modify
Session-Based Authentication: Uses Foundry's built-in authentication system

System Requirements

Foundry VTT: Version 13
Claude Desktop: Latest version with MCP support
Claude Pro/Max Plan: Required to connect to MCP servers
Operating System: Windows 10/11 (installer), or other OSes/manual Windows install with Node.js 18+ (manual)

Support & Development

Issues: Report bugs on GitHub Issues
YouTube Channel: Subscribe for updates and tutorials
Support Development: Support on Patreon
Documentation: Built with TypeScript, comprehensive documentation included
License: MIT License

This server cannot be installed

security - not tested

license - permissive license

quality - not tested

How are these scores calculated?

local-only server

The server can only run on the client's local machine because it depends on local resources.

Connects Claude Desktop to Foundry VTT for AI-powered campaign management, enabling natural language interaction with game data including quest creation, character management, compendium searches, and dice rolling. Provides 20 MCP tools for seamless integration between Claude and your tabletop RPG sessions.

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