In the user interface for Railway, all destructive actions require multiple confirmations, plus typing "apply destructive changes". Why would an API key (regardless of its scope) be able to delete without confirmation?
What do you think an API is for? There's no user sitting at the keyboard when an API is called so where would that confirmation come from? It can't come from the user because there is no user.
How do you see this working? Any confirmation would be given by the agent.