IMHO just an API would be enough, tool could be written on top of that. My ideal world would be every service, tool and application to have API that I can use

IMHO just an API would be enough, tool could be written on top of that. My ideal world would be every service, tool and application to have API that I can use i.e. if fridge is open too long (API polling or API webhook) I can send roomba to close it (using API of roomba). Because why not?! World of API...