Honestly, I could see a pretty easy use case for some OpenAPI endpoint definitions to be pass through to a local tool. As such, adding the ability to translate a URL to a CMD could be useful.

Outside of that, most of the effort has a very 1:1 use. Response code would be exit code, of course. But describing the output would then be the same. The vast majority of an OpenAPI doc is for documentation purposes.

And, I should add, I'm honestly not a huge fan of OpenAPI. I'm just guessing I will also not be a fan of MCP.