How do I give accessibility permission to my AppleScript and System Events in Mavericks? I've got this old AppleScript that uses a mouseclick function:

activate application "Safari"
tell application "System Events"
    tell process "Safari"
        click at {424, 699}
    end tell
end tell


It no longer works, probably due to a change in how the accessibility permissions works in Mavericks. You need to give permissions on an app by app basis. Unfortunately, SystemEvents.app is not in the list of apps to give permissions. How can I make it appear? Is there another solution that does not depend on downloading utilities from third-parties?

This is the error message I get:

error "System Events got an error: Can’t make {424, 699} into type list." number -1700 from {424, 699} to list
Your problem is independent of the accessibility permission. 

Replace your click line with something like click window 1 and it will ask you to allow or deny access to the accessibility features. 

There is a problem with click at and I don't know what it is.  

Edit : My conclusion after some tests : click at is broken. 
The release note of AppleScript updated with the release of Mavericks does not state some kind of removal of this feature. Some that might be a bug. 

I submitted a bug report to Apple. 

Edit : The issue has been fixed on Yosemite, click at works well again !