GraphQL Toolkit MCP server

This GraphQL MCP server provides a bridge for language models to interact with GraphQL APIs through dynamic schema introspection and query execution. It allows AI assistants to discover and use GraphQL endpoints without requiring hardcoded schema information.

Installation

Via Smithery (Recommended)

Install the GraphQL MCP server for Claude Desktop automatically using Smithery:

npx -y @smithery/cli install mcp-graphql --client claude

Manual Installation

To manually configure Claude to use the GraphQL MCP server:

{
  "mcpServers": {
    "mcp-graphql": {
      "command": "npx",
      "args": ["mcp-graphql", "--endpoint", "http://localhost:3000/graphql"]
    }
  }
}

Basic Usage

Run the MCP server by specifying your GraphQL endpoint:

npx mcp-graphql --endpoint http://localhost:3000/graphql

Command Line Options

Argument	Description	Default
--endpoint	GraphQL endpoint URL	http://localhost:4000/graphql
--headers	JSON string with request headers	{}
--enable-mutations	Allow mutation operations	false
--name	Name of the MCP server	mcp-graphql
--schema	Path to local GraphQL schema file	-

Usage Examples

Basic Configuration

Connect to a local GraphQL server:

npx mcp-graphql --endpoint http://localhost:3000/graphql

Using Authentication Headers

For APIs requiring authentication:

npx mcp-graphql --endpoint https://api.example.com/graphql --headers '{"Authorization":"Bearer token123"}'

Enabling Mutations

To allow models to perform write operations (use with caution):

npx mcp-graphql --endpoint http://localhost:3000/graphql --enable-mutations

Using a Local Schema File

If you prefer not to use introspection:

npx mcp-graphql --endpoint http://localhost:3000/graphql --schema ./schema.graphql

Available Tools

The server provides two main tools for language models to use:

introspect-schema

This tool retrieves the GraphQL schema, which is essential for the model to understand the API's capabilities. This should typically be used first when working with a new API.

query-graphql

Executes GraphQL queries against the endpoint. By default, mutation operations are disabled as a security measure.

Security Notes

Remember that mutations are disabled by default to prevent unintended data modifications. Only enable mutations in environments where you want the model to make changes to your data.

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "mcp-graphql" '{"command":"npx","args":["mcp-graphql","--endpoint","http://localhost:3000/graphql"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "mcp-graphql": {
            "command": "npx",
            "args": [
                "mcp-graphql",
                "--endpoint",
                "http://localhost:3000/graphql"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

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

2. Add this to your configuration file:

{
    "mcpServers": {
        "mcp-graphql": {
            "command": "npx",
            "args": [
                "mcp-graphql",
                "--endpoint",
                "http://localhost:3000/graphql"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect