Come impedire all'agente di lancio di lanciare ripetutamente un determinato AppleScript

Sto cercando di creare un agente di lancio, che avvia un AppleScript ogni volta che viene collegato un mouse. Simile a queste due domande:

• Chiave LaunchEvents non riconosciuta in launchd plist (rilevamento dispositivo USB)
• Esegui un'applicazione su Mac OS X quando è collegato un particolare tipo di dispositivo USB?

Tuttavia, una volta caricato il mio launch agent (tramite launchctl load ), continua a partire ogni 5 o così secondi. Come faccio a garantire che l'agente venga eseguito una volta sola, quando il mouse è connesso?

Ecco il mio agente (plist):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>KeepAlive</key>
    <false/>
    <key>Label</key>
    <string>com.automations.switchscrolldirection</string>
    <key>ProgramArguments</key>
    <array>
        <string>osascript</string>
        <string>/Users/lirik/Documents/Automation/SwitchScrollDirectionOnMouseEvent.scpt</string>
    </array>
    <key>LaunchEvents</key>
    <dict>
        <key>com.apple.iokit.matching</key>
        <dict>
            <key>com.apple.device-attach</key>
            <dict>
                <key>idProduct</key>
                <integer>49277</integer>
                <key>idVendor</key>
                <integer>1133</integer>
                <key>IOProviderClass</key>
                <string>IOUSBDevice</string>
                <key>IOMatchStream</key>
                <true/>
                <key>IOMatchLaunchStream</key>
                <true/>
            </dict>
        </dict>
    </dict>
</dict>
</plist>

AppleScript in questione:

on gamingMouseIsAttached()
    tell application "System Preferences"
        activate
        set current pane to pane "com.apple.preference.mouse"
    end tell
    tell application "System Events" to tell process "System Preferences"
        repeat until exists checkbox 1 of window "Mouse"
        end repeat
        tell checkbox 1 of window "Mouse" to if value is 1 then click
    end tell
    tell application "System Preferences" to quit
end gamingMouseIsAttached

on TrackpadIsAttached()
    tell application "System Preferences"
        activate
        set current pane to pane "com.apple.preference.trackpad"
    end tell
    tell application "System Events" to tell application process "System Preferences"
        repeat until exists checkbox 1 of tab group 1 of window "Trackpad"
        end repeat
        tell checkbox 1 of tab group 1 of window 1 to if value is 0 then click
    end tell
    tell application "System Preferences" to quit
end TrackpadIsAttached

tell current application
    delay 15
    set internalTrackpad to (do shell script "system_profiler SPUSBDataType | awk '/Trackpad:/ { print \"Internal Trackpad\" }'")
    set gamingMouse to (do shell script "system_profiler SPUSBDataType | awk '/Gaming Mouse G502:/ { print \"Gaming Mouse\" }'")

    if gamingMouse is equal to "" then
        if internalTrackpad is equal to "Internal Trackpad" then
            my TrackpadIsAttached()
            return
        end if
    end if

    if gamingMouse is equal to "Gaming Mouse" then
        my gamingMouseIsAttached()
        return
    end if
end tell