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relay-mcp

v1.2.0

Published

Universal OpenAPI to MCP relay server with enterprise authentication

Vulnerabilities

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Links

Maintainers

derekluoderekluo

Keywords

mcpopenapiswaggerapirelayaiclaudebridgetoolsenterpriseauthtypescript

Readme

Relay

Universal OpenAPI ➜ MCP relay server with enterprise authentication.

npm version npm downloads

What is Relay?

Relay converts any OpenAPI/Swagger specification into AI-callable MCP tools. It acts as a bridge between AI assistants and REST APIs, automatically generating tools from API documentation and executing real HTTP requests.

Main Function: Transform any REST API into MCP tools that AI assistants can use directly.

Installation

npm install relay-mcp

Basic Usage

  1. Install and build:
npm install
npm run build
  1. Configure (create .env file):
SWAGGER_SOURCE=url
SWAGGER_URL=https://petstore.swagger.io/v2/swagger.json
AUTH_TYPE=none
  1. Run the server:
npm start
  1. Add to MCP client (e.g., Claude Desktop for stdio):
{
  "mcpServers": {
    "relay": {
      "command": "node",
      "args": ["/path/to/relay/dist/index.js"],
      "env": {
        "SWAGGER_SOURCE": "url",
        "SWAGGER_URL": "https://petstore.swagger.io/v2/swagger.json",
        "AUTH_TYPE": "none",
        "TRANSPORT": "stdio"
      }
    }
  }
}

Or run as a standalone server with SSE/HTTP:

# For SSE transport
TRANSPORT=sse TRANSPORT_PORT=3000 npm start

# For HTTP transport
TRANSPORT=http TRANSPORT_PORT=3000 npm start

Then configure your MCP client to connect to http://localhost:3000/mcp.

Features

  • Dynamic tool generation from any OpenAPI/Swagger spec
  • Real HTTP execution with interceptors and structured logging
  • Auth: API Key (header/query), Bearer, Basic
  • OpenAPI 2.0 and 3.x support
  • Multiple transport modes: stdio, SSE (Server-Sent Events), HTTP

Documentation

Links

License

MIT