One of the most elegant descriptions of the scope of Programmers.SE came from Thomas Owens in chat:
Picture Programmers like a small conference room with a whiteboard. No computer, no books, no papers. You write your question on the whiteboard and experts walk by. Someone sees one that they can answer, they stop in and help.
Modify the top of the help/on-topic on the site to put this in the description.
Currently the text reads:
What topics can I ask about here?
Programmers Stack Exchange is a Q&A site for professionals and students in software development and related fields who are interested in getting expert answers on conceptual questions about software development.
If you have a question about...
Modify the text to read (italics bit added to show difference - not intended to be in final):
What topics can I ask about here?
Programmers Stack Exchange is a Q&A site for professionals and students in software development and related fields who are interested in getting expert answers on conceptual questions about software development. Questions are ideally those which can be answered as if one was standing in front of a whiteboard with no access to a computer, reference books, or documentation.
If you have a question about...
The intended goal is to try to send a message (to those who read it) of "asking questions about debugging and how to fix this error from a compiler completely goes against the spirit of the site."
I'm not sure this type of message can be bit in the site tour.