Just for general knowledge what is the purpose of XPCServices and Agent related to a specific application? I will try to give you an example.
I noticed when I launch the Calendar Application I see the following 2 processes running:
/System/Library/PrivateFrameworks/CalendarNotification.framework/Versions/A/XPCServices/CalNCService.xpc/Contents/MacOS/CalNCService
/System/Library/PrivateFrameworks/CalendarAgent.framework/Executables/CalendarAgent
I noticed when I launch the Calendar Application I see the following 2 processes running:
/System/Library/PrivateFrameworks/CalendarNotification.framework/Versions/A/XPCServices/CalNCService.xpc/Contents/MacOS/CalNCService
/System/Library/PrivateFrameworks/CalendarAgent.framework/Executables/CalendarAgent