OpenAPI MCP Server

This is a Model Context Protocol (MCP) server that reads an OpenAPI specification file and exposes each API operation as a tool for Claude AI to use.

Features

• Automatically parses OpenAPI YAML files
• Generates MCP tools for each API operation
• Handles path parameters, query parameters, and request bodies
• Makes live API calls when Claude uses the tools
• Easy integration with Claude Desktop

Installation

# Clone the repository
git clone https://github.com/yourusername/openapi-mcp-server.git
cd openapi-mcp-server

# Install dependencies
npm install

Usage

1. Place your OpenAPI YAML file in the project directory or provide a path to it via environment variables.

2. Set up environment variables (optional):

# Create a .env file
echo "DEBUG=true" > .env
echo "OPENAPI_FILE=./path/to/your/openapi.yaml" >> .env

3. Initialize the server with Claude Desktop:

npm run init

4. Or run the server manually:

npm start

Configuration

You can configure the server using environment variables:

• DEBUG: Set to true to enable debug logging (default: false)
• OPENAPI_FILE: Path to your OpenAPI YAML file (default: ./openapi.yaml)

How it Works

The server reads your OpenAPI specification file and:

1. Extracts all paths and operations

2. Creates a tool for each operation with appropriate input schemas

3. When Claude calls a tool, the server makes the corresponding API request

4. The response is returned to Claude for analysis

Example

With an OpenAPI spec like:

paths:
  /users:
    get:
      operationId: listUsers
      summary: List all users
      ...

Claude can call the listUsers tool, and the server will make a GET request to /users on your behalf.

License

MIT