Does anyone know how to make decisions for a specific country and not every single country?

I've just pushed an update for the decision tool which added two new fields to the decision category; Allowed & Visible.

To make a decision list available for just one country, e.g. Germany, you would add into the "Allowed" box:

original_tag = GER

And if you only wanted to have the decision category show when something has happened, that's when you put stuff in the "Visibility" box, e.g.:

at_war = true

If you want to do it for individual decisions, then you follow the above, for each decision. But instead of the "Allowed" box, it's called "Available"

How do you make the decisions actually... do things? For me, the decisions just have prerequisites for them to be visible, and seem to do absolute nothing in game. How do I make them trigger events, annex countries, etc.