mcp-graphql
A Model Context Protocol server that enables LLMs to interact with GraphQL APIs. This implementation provides schema introspection and query execution capabilities, allowing models to discover and use GraphQL APIs dynamically.
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Usage
Run mcp-graphql with the correct endpoint, it will automatically try to introspect your queries.
Environment Variables (Breaking change in 1.0.0)
Note: As of version 1.0.0, command line arguments have been replaced with environment variables.
| Environment Variable | Description | Default | |----------|-------------|---------| | ENDPOINT | GraphQL endpoint URL | http://localhost:4000/graphql | | HEADERS | JSON string containing headers for requests | {} | | ALLOW_MUTATIONS | Enable mutation operations (disabled by default) | false | | NAME | Name of the MCP server | mcp-graphql | | SCHEMA | Path to a local GraphQL schema file or URL (optional) | - |
Examples
# Basic usage with a local GraphQL server
ENDPOINT=http://localhost:3000/graphql npx mcp-graphql
# Using with custom headers
ENDPOINT=https://api.example.com/graphql HEADERS='{"Authorization":"Bearer token123"}' npx mcp-graphql
# Enable mutation operations
ENDPOINT=http://localhost:3000/graphql ALLOW_MUTATIONS=true npx mcp-graphql
# Using a local schema file instead of introspection
ENDPOINT=http://localhost:3000/graphql SCHEMA=./schema.graphql npx mcp-graphql
# Using a schema file hosted at a URL
ENDPOINT=http://localhost:3000/graphql SCHEMA=https://example.com/schema.graphql npx mcp-graphqlResources
- graphql-schema: The server exposes the GraphQL schema as a resource that clients can access. This is either the local schema file, a schema file hosted at a URL, or based on an introspection query.
Available Tools
The server provides two main tools:
- introspect-schema: This tool retrieves the GraphQL schema. Use this first if you don't have access to the schema as a resource.
This uses either the local schema file, a schema file hosted at a URL, or an introspection query.
- query-graphql: Execute GraphQL queries against the endpoint. By default, mutations are disabled unless
ALLOW_MUTATIONSis set totrue.
Installation
Installing via Smithery
To install GraphQL MCP Server for Claude Desktop automatically via Smithery:
npx -y @smithery/cli install mcp-graphql --client claudeInstalling Manually
It can be manually installed to Claude: ``json { "mcpServers": { "mcp-graphql": { "command": "npx", "args": ["mcp-graphql"], "env": { "ENDPOINT": "http://localhost:3000/graphql" } } } } ``
Security Considerations
Mutations are disabled by default as a security measure to prevent an LLM from modifying your database or service data. Consider carefully before enabling mutations in production environments.
Customize for your own server
This is a very generic implementation where it allows for complete introspection and for your users to do whatever (including mutations). If you need a more specific implementation I'd suggest to just create your own MCP and lock down tool calling for clients to only input specific query fields and/or variables. You can use this as a reference.
