Passive checks - convert existing service

[gmills]

Hello,
I have another question on what I can and can't do.

My use case is,

I have a Windows machine that runs a service, this service performs several things, I'd like to report on.
on this windows machine there is an existing service.

I would like to modify this existing service to communicate with Nagios.
I'm reading passive checks now.

Q. Do I still need to install the NCPA agent for this ?

[gmills]

service Cluster-DeltaMRO-Container-Service restart