We already have quite a lot of country-tags by now. Given enough time we will likely end up with tags for pretty much every country in the world. For that reason I think it would make sense to set a guideline what information the tag excerpt (usage guideline) and the tag wiki article of a country should contain.
Here are some examples what we already got:
a [government form] in [geographical region]
for questions about [country]
Regarding tag articles, there does not seem to exist any discernible pattern yet.
What do you think should be the standard?