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By a review on the tags lists, we see that some of the tags do not have any wiki or excerpts. I just want to know, which one is more prefered, a tag without any wiki or excerpt; or a tag with a wiki excerpt that just says "{topic}: this tag is for questions about {topic}" is better than nothing?

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A tag wiki that does not add any meaningful information is not helpful.

An empty tag wiki at least signals that somebody should write a meaningful tag wiki.

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Some words have a few different meanings or contexts.

IMHO a tag wiki is for disambiguating them, e.g. by providing synonyms or longer description.

Don't add "This tag is about..." (Even "Questions on..." may be redundant.). See tags from Stack Overflow as a good example.

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