In the question posted here the OP uses suitable tags for the question, namely tikz-pgf, tikz-arrows, graphs.

The accepted answer (mine) uses tikz-cd. Is it appropriate to add the tikz-cd tag to the question? The use of tikz-cd in the answer is somewhat atypical (for beginners), using nodes for cells, so I thought the tag might be helpful from a search perspective.

2 Answers 2


The general position has always been that tags are about questions, not answers. So tagging because an answer (accepted or not) uses a particular package has not been regarded as desirable.

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    While I agree with you in general and in principle, I do think there are times that a tag has been omitted only because the questioner does not fully understand the scope of his or her own question. In such cases, it may make sense to add a tag associated with the natural answer to the question. Apr 2, 2022 at 21:00

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.

For example, [tag:tikz-cd] looks like . 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 .

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:

enter image description here

Or this:

enter image description here

The other answer could then similarly be tagged .

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