add this line in vorpal/lib/session.js

[ORESoftware]

  wrapper.args.command = wrapper.command;

add that line above this section:

 wrapper.args.command = wrapper.command;

  // Call the root command.
  res = wrapper.fn.call(commandInstance, wrapper.args, function () {
    debugger;
    var argus = util.fixArgsForApply(arguments);
    onCompletion(wrapper, argus[0], argus[1], argus);
  });

[ORESoftware]

not that but this instead:

if(wrapper.args && typeof wrapper.args === 'object'){
  wrapper.args.rawCommand = wrapper.command;
}