GW2 MCP Server

A Model Context Provider (MCP) server for Guild Wars 2 that bridges Large Language Models (LLMs) with Guild Wars 2 data sources.

Features

• Wiki Search: Search and retrieve content from the Guild Wars 2 wiki
• Wallet Information: Access user wallet and currency data via GW2 API
• Smart Caching: Efficient caching with appropriate TTL for static and dynamic data
• Rate Limiting: Respectful API usage with built-in rate limiting
• Extensible Architecture: Modular design for easy feature additions

Requirements

• Go 1.24 or higher
• Guild Wars 2 API key (for wallet functionality)

Installation

1. Clone the repository:

git clone https://github.com/AlyxPink/gw2-mcp.git
cd gw2-mcp

2. Install dependencies:

go mod tidy

3. Build the server:

go build -o gw2-mcp ./cmd/server

Usage

Running the Server

The MCP server communicates via stdio (standard input/output):

./gw2-mcp

You can configure Claude Desktop, LM Studio, or other LLM tools to interact with the server using this configuration:

{
  "mcpServers": {
    "gw2-mcp": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "alyxpink/gw2-mcp:v1"
      ]
    }
  }
}

MCP Tools

The server provides the following tools for LLM interaction:

1. Wiki Search (wiki_search)

Search the Guild Wars 2 wiki for information.

Parameters:

• query (required): Search query string
• limit (optional): Maximum number of results (default: 5)

Example:

{
  "tool": "wiki_search",
  "arguments": {
    "query": "Dragon Bash",
    "limit": 3
  }
}

2. Get Wallet (get_wallet)

Retrieve user's wallet information including all currencies.

Parameters:

• api_key (required): Guild Wars 2 API key with account scope

Example:

{
  "tool": "get_wallet",
  "arguments": {
    "api_key": "YOUR_GW2_API_KEY"
  }
}

3. Get Currencies (get_currencies)

Get information about Guild Wars 2 currencies.

Parameters:

• ids (optional): Array of specific currency IDs to fetch

Example:

{
  "tool": "get_currencies",
  "arguments": {
    "ids": [1, 2, 3]
  }
}

MCP Resources

The server provides the following resources:

Currency List (gw2://currencies)

Complete list of all Guild Wars 2 currencies with metadata.

API Key Setup

To use wallet functionality, you need a Guild Wars 2 API key:

1. Visit Guild Wars 2 API Key Management
2. Create a new API key with the following permissions:
   • account - Required for wallet access
   • wallet - Required for currency information
3. Copy the generated API key

Security Note: API keys are hashed before caching for security. Never share your API key.

Caching Strategy

The server implements intelligent caching:

• Static Data (currencies, wiki content): Cached for 24 hours to 1 year
• Dynamic Data (wallet balances): Cached for 5 minutes
• Search Results: Cached for 24 hours

Architecture

The project follows Clean Architecture principles:

internal/
├── server/          # MCP server implementation
├── cache/           # Caching layer
├── gw2api/          # GW2 API client
└── wiki/            # Wiki API client

Development

Code Standards

• Format code with gofumpt
• Lint with golangci-lint
• Write unit tests for core functionality
• Follow conventional commit messages

Running Tests

go test ./...

Linting

golangci-lint run

Formatting

gofumpt -w .

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests if applicable
5. Run linting and formatting
6. Submit a pull request

License

GNU Affero General Public License v3.0 - see LICENSE file for details.

Acknowledgments

• Guild Wars 2 API for providing comprehensive game data
• Guild Wars 2 Wiki for extensive game documentation
• MCP Go for the MCP implementation framework