Titles should be complete summaries of the question.
Here's the easy rule:
Cover the tags, and ask yourself if the title conveys enough information. It needs to.
That means two things:
- Information in a tag in no way makes it less necessary in a title.
- But tags need not be added to a title when they're not needed to convey key information
Tags are for filtering, not for completing otherwise incomplete titles.
See this meta post for more detailsSee this meta post for more details.