My friend created an iPhone app that controls a set of MCP servers that will control all the smart things in his house. Completely vibe coded. The servers are in Python, which he can read but not really write, and the app is in Swift, which he doesn't understand at all.
It's a little more complicated than that. :). He has 100s of smart things from tens of providers, and they all work differently. He wants to be able to do things like say "light the path from the bedroom to the kitchen with dim light" and have it do the right thing, which means turning on all the lights with their various APIs all to the right brightness, and understanding what lights lead from the bedroom to the kitchen.
MCP to turn on a light bulb?