Occasionally there are answerers that put a tag at the start of an answer, as a visual way of saying "This answer uses such-and-such package or technique". Stack Exchange has markdown for that.
[tag:tikz-cd] looks like tikz-cd. This button is also a link to all the questions with this tag, i.e., https://tex.stackexchange.com/questions/tagged/tikz-cd. On the main page this also shows the tag excerpt on mouseover. For Meta the equivalent (with a link and mouseover) is
[meta-tag:tagname], for example tagging.
I couldn't find any guidance on TeX.Meta or on Meta.SE if this is a good idea, but personally I find it helpful to add such a tag in case you use an approach that the asker did not know about, or an approach using a different package than mentioned in the question (which is perfectly valid by itself).
Your answer would look for example like this:
The other answer could then similarly be tagged pstricks.