What entitlements must I specify to use defaults write com.apple.screencapture in NSTask()

I got the app working fine then went to submit to the app store and discovered this thing called the sandbox :-p

I have been reading the documentation and developer forums, but I cant figure out specifically what entitlement I need to add to get this working:

let task =NSTask() task.launchPath ="/bin/bash" task.arguments =["-c","defaults write com.apple.screencapture type gif;killall SystemUIServer"] task.launch()

I've thought perhaps

com.apple.screencapture

com.apple.security.temporary-exception.shared-preference.read-write