I have tried the following:

var link = new sn_hr_sp.emailUtil(current, email_action).getLink();

 link = link + 'sysparm_view=agent_workspace';

var link = new sn_hr_sp.emailUtil(current, email_action).getLink();

 link = link + 'sysparm_view=workspace';

var link = new sn_hr_sp.emailUtil(current, email_action).getLink();
    link = link + 'truesysparm_view=agent_workspace';

var link = new sn_hr_sp.emailUtil(current, email_action).getLink();
    link = link + 'truesysparm_view=workspace';