AppleScript to toggle macOS accessiblity for greyscale

toggle_greyscale.osa

# Tested on macOS Mojave.
# Depending on your language settings you may need to change "greyscale" to "grayscale".

tell application "System Preferences"
	activate
	reveal anchor "Seeing_Display" of pane id "com.apple.preference.universalaccess"
end tell

tell application "System Events" to tell process "System Preferences"
	repeat until exists of checkbox "Use greyscale" of group 1 of window "Accessibility"
		delay 0.1
	end repeat
	click the checkbox "Use greyscale" of group 1 of window "Accessibility"
end tell

tell application "System Preferences"
	quit
end tell