If confirmation before command execution is what you are looking for, why don't you use the WFA's Approval point feature. It will do exactly what to you require.
Example: You can add an Approval Point before this "Delete Volume" command
Provide a Approval Comment like "The volume being deleted is: "+ $VolumeName
Upon Execution, this Approval point comment will be available to the user at Execution Status . Now he/she will have choice to Approve and Proceed with execution or Reject and Abort.
I think WFA developer's Guide will have details about using Approval Points in workflows.
If not, send me a mail at sinhaa at netapp dot com and I'll guide you how to use it. Its easy.
If this post resolved your issue, help others by selecting ACCEPT AS SOLUTION or adding a KUDO.