It'd be great to have a schema allowing the notification to the user that a command requested via a 3p skill has been executed successfully or not. For example

U: "Alexa, ask {my skill} to set the temperature of my oven to 220C and tell me when it's ready to bake"
A: "Ok, I'll send you a notification when the oven is ready"
... several minutes later...
<yellow light>
U: "Alexa, what's new?"
A: "You have one new notification from your oven. The {command} has been executed on {target}"

or

A: "one new notification from your oven. Something went wrong with {command}: please ask {your skill} for more info"

The ideal schema would look like

{
"event": {
"name": "AMAZON.RemoteCommand.Executed",
"payload": {
"remoteCommand": {
"command": "localizedattribute:command",
"target": "localizedattribute:target",
"parameter" : "220 C"
}
}
},
"localizedAttributes": [
{
"locale": "en-US",
"command": "Set Temperature"
},
{
"locale": "en-US",
"target": "your Oven"
},
]
}