OpenAPI to MCP server

This is a small helper program that reads an OpenAPI description of an API and turns each of its endpoints into a tool your AI can use. It is handy if you already have an OpenAPI file (or a link to one) for a service you use, and you want your AI to be able to talk to that service directly. You do not need to write any code, just point it at the file.

What this MCP server does

You give this helper the address of an OpenAPI file, either a web link or a file on your computer. The helper reads it and creates a list of tools, one for each endpoint in that API. When you ask your AI something, the AI picks the right tool and calls it. The helper then sends the actual request to the real API and brings the answer back into your chat.

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What you can do with it

• Call any endpoint listed in an OpenAPI file
• Send parameters and request bodies exactly as the API expects
• Use a bearer token or OAuth2 to log in to the API
• Rename or hide specific endpoints with small notes in the OpenAPI file
• Point at a local file or a web link for the OpenAPI description
• Work with OpenAPI 2.0 and 3.0 files in JSON or YAML

Try asking your AI

• “List all pets available in the petstore”
• “Show me the open issues in the github repository octocat/Hello-World”
• “Create a new pet named Fluffy with status available”
• “What is the status of order 12345 in the petstore”

What it gives back to you

You get back whatever the API returns, shown right in your chat. That could be a list of items, a single record, a status message, or an error if something went wrong. The helper does not change or summarize the answer, it passes it through as is.

Before you start

Who it's for

People who already have an OpenAPI description for a service and want their AI to use that service without writing code.