The security issues and chance for direct harm makes me immediately recoil. "No, never, not even once as a joke." levels of nope. The sort of thing you would hear mentioned and move past without a second thought because obviously no one should or will ever do that.
...and yet it also feels like the sort of thing that could be a common, every day kind of thing. Is this really that different from an automated drop shipping company? A piece of logistics software that makes sure there are always pens and napkins?
I am going to stop thinking about this now. If MCP based automated purchasing is the future, I will let others build it.