How to toggle dark mode on and invert colors using Automator
I don't know about invert colors, but to quickly toggle Dark/Light Mode, In Automator:

Make a new Application document:



Simply add the chunk for Change System Appearance &gt; Toggle Light/Dark:



Save and name the application somewhere you can easily activate it, such as the Desktop so you can double-click it to toggle Dark Mode. Alternatively, you can simply search for it in Spotlight search and hit Enter to activate it.

I'll also plug a great app I came across called Night Owl, which is a menu bar app that toggles Dark Mode and you can assign a keyboard shortcut to it. This is what I use now after previously using the Automator solution.