I figure it's better to be safe than sorry:
If you include the title, genre, and word count, does that count in the 250 word limit? Or is that outside of the hook?
Outside the word count. Don't get cute though. No "compelling riveting tale of 250000 words that will leave mystery readers clawing at the shelves for more".
All hyperbole is reserved for Miss Snark's snarcomments.