
mcp-graphql
Model Context Protocol server for GraphQL
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mcp-graphql is a Model Context Protocol server that enables Large Language Models (LLMs) to interact with GraphQL APIs. It provides schema introspection and query execution capabilities, allowing models to dynamically discover and use GraphQL APIs. The server offers tools for retrieving the GraphQL schema and executing queries against the endpoint. Mutations are disabled by default for security reasons. Users can install mcp-graphql via Smithery or manually to Claude Desktop. It is recommended to carefully consider enabling mutations in production environments to prevent unauthorized data modifications.
README:
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.
Run mcp-graphql
with the correct endpoint, it will automatically try to introspect your queries.
Argument | Description | Default |
---|---|---|
--endpoint |
GraphQL endpoint URL | http://localhost:4000/graphql |
--headers |
JSON string containing headers for requests | {} |
--enable-mutations |
Enable mutation operations (disabled by default) | false |
--name |
Name of the MCP server | mcp-graphql |
--schema |
Path to a local GraphQL schema file (optional) | - |
# Basic usage with a local GraphQL server
npx mcp-graphql --endpoint http://localhost:3000/graphql
# Using with custom headers
npx mcp-graphql --endpoint https://api.example.com/graphql --headers '{"Authorization":"Bearer token123"}'
# Enable mutation operations
npx mcp-graphql --endpoint http://localhost:3000/graphql --enable-mutations
# Using a local schema file instead of introspection
npx mcp-graphql --endpoint http://localhost:3000/graphql --schema ./schema.graphql
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 or an introspection query.
-
query-graphql: Execute GraphQL queries against the endpoint. By default, mutations are disabled unless
--enable-mutations
is specified.
- graphql-schema: The server exposes the GraphQL schema as a resource that clients can access. This is either the local schema file or based on an introspection query.
To install GraphQL MCP Server for Claude Desktop automatically via Smithery:
npx -y @smithery/cli install mcp-graphql --client claude
It can be manually installed to Claude:
{
"mcpServers": {
"mcp-graphql": {
"command": "npx",
"args": ["mcp-graphql", "--endpoint", "http://localhost:3000/graphql"]
}
}
}
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.
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.
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