You can setup and schedule a Windows or Unix job to run the LISTAGENT cli command and use the 'Attach spool file' option in Email Notification to attach the spool file to an email when the job completes.
Example of a Windows job;
Command to run: C:\Program Files\CA\WorkloadAutomation_R12_SP1\bin\cli.bat
Arguments to pass: MYSERVER 7500 ADMIN admin "listagent agent('*')"
Job's spool file output attach to email;
----------------------------------------------------------------
Output of messages for workload object LIST_AGENTSTATUS_JOB/LIST_AGENTSTATUS.3/MAIN
Start date Mon Aug 07 08:15:00 2017
----------------------------------------------------------------
R12SP1_AGENT
Status: Active
AGENT_06_PS
Status: Active
AGENT_06
Status: Active
AGENT_SP6
Status: Inactive
AGENT_SP6_WS
Status: Inactive