The task failed with exit code 1 and no stdout, but stderr contained:
  [Microsoft.PowerShell.Commands.WriteErrorException,install_powershell.ps1] Exception At line:65 char:3
  +   & "C:\Users\chengkai.liang\AppData\Local\Temp\ckl3f0ck.iqd\install_ ...
  +   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.
  Puppet Agent upgrade cannot be done while Puppet services are still running.
Failed on 1 target: <winrm://us03l12agt01.ppe.costcotravel.com>

so looks like when running bolt task puppet_agent::install, it failed if puppet agent is running? So it won't stop the agent when this was detect?