The condition should be described as well. But XLib must always be noted as it's a very serious flaw. Either it is or it isn't. Don't copy someone else's bibliographic description word for word. While condition is likely the most important part of the description, there are also standard methods of describing the collation and particularities of a book.
Descriptive bibliography is a big subject, and requires quite a bit of study.
For a really good education in describing books, find some respected dealers catalogues, and read their descriptions. For best results, get one of the recommended books listed in the right sidebar and use it to help you decode everything that you don't understand. A Checklist of Price Guides to Collectible Books Recommended Books John Carter ABC for Book Collectors. Geoffrey Ashall Glaister. Encyclopedia of the Book Fredson Bowers.