OpenAPI Proxy MCP server

The OpenAPI MCP Server enables searching and exploring OpenAPI specifications through oapis.org, providing an interface for Claude/Cursor to understand and work with API documentation. It works by determining the OpenAPI identifier you need, requesting a simple language summary, and analyzing specific endpoints.

Features

• Get an overview of any OpenAPI specification
• Retrieve details about specific API operations
• Support for both JSON and YAML formats
• Tested with Claude Desktop and Cursor

Installation Options

Via Smithery

The easiest way to install openapi-mcp-server for Claude Desktop is automatically via Smithery:

npx -y @smithery/cli install @janwilmake/openapi-mcp-server --client claude

Via npx

Alternatively, you can install using npx:

npx openapi-mcp-server@latest init

Follow the on-screen instructions that appear after running this command to complete the installation.

Using with Claude

After installation, you can interact with your MCP server through Claude by asking questions like:

• "Find information about the Stripe API"
• "Explain how to use the GitHub API's repository endpoints"

The MCP server will work in the background to:

1. Get a comprehensive overview of the requested API
2. Retrieve specific operation details as needed by Claude
3. Present the information in simple language

System Requirements

• Node.js >= 16.17.0
• Claude Desktop, Cursor, or any other MCP-compatible client

How to add this MCP server to 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 > MCP and click "Add new global MCP server".

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

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

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 explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.