"aws swf register-domain" output argument

My use case is region build services chain reaction plugin - aws cli. My objective is to reduce the number of tasks to automate. I'd like to execute one command and receive feedback about success or failure to enable workflow continuation or do retry enforcement.

I am using aws swf register-domain for its intended purpose and I'd like to understand if it is at all possible to invoke a response from the command execution other than none. I look longingly at the --output argument which, according to documentation, allows one to determine an output format. Does this imply that using the argument enables one to invoke a json response from the execution of a sequence that looks like this aws --region xyz-northeast-1 swf register-domain --name unique-domain-name --workflow-execution-retention-period-in-days 90 --output json ?