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I suppose that because because of the updated way that the Calendar application is integrated into the OS X system and the notification area the "calendar agent" needs to constantly run in the background on OS X ML.

I see it making a lot of requests when I debug the HTTP(s) requests on the system. The requests stop if I do killall CalendarAgent:

How can I keep the calendar agent from running in the background?

P.S.: I also tried removing the calendar from the notification area without luck:

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up vote 13 down vote accepted

You can try like this:

launchctl unload /System/Library/LaunchAgents/com.apple.CalendarAgent.plist

If you want to make this permanent:

launchctl unload -w /System/Library/LaunchAgents/com.apple.CalendarAgent.plist

Hope it helps!

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It doesn't work (with nor without sudo) launchctl unload -w /System/Library/LaunchAgents/com.apple.CalendarAgent.plist produces launchctl: Error unloading: com.apple.CalendarAgent because that's apparently not the agent that's running: launchctl list|grep -i cal and i get 76977 - 0x7fbf59e07fa0.anonymous.CalendarAgent. I've force quit the agent, manually disabled it in the plist, remove all notifications, and calendar system preferences settings yet it still returns. – nix Jul 12 '13 at 3:07
    
I also disable Calendar in the Spotlight Preferences yet still the CalendarAgent is magically starting. – nix Jul 12 '13 at 16:13

Within 10.8.4 (12D78) doing: launchctl unload /System/Library/LaunchAgents/com.apple.CalendarAgent.plist without sudo works fine.

I only get: launchctl: Error unloading: com.apple.CalendarAgent with attempting sudo....

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1  
I can't tell if this is an answer or a comment... – Taegost Jul 31 '13 at 12:47

There may be a previously entered password for the process in your login Keychain. You may have to remove a key or certificate using the Keychain Access utility.

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Query launchctl for the label

$ launchctl list|grep -i calendar
725 0   com.apple.CalendarAgent

This means that it is running under your user account.

Running the following will remove it from your current login session:

$ launchctl remove com.apple.CalendarAgent

Check:

$ launchctl list|grep -i calendar
$

Return output should be nothing.

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