Should my job offer include a complete job description?

The question you're asking has nothing to do with legal advice, and depends entirely on the strength of your particular likes and dislikes.  How important is it to you that you get a full job description before taking the job (fyi, if your job offer is not for a definite term and/or doesn't limit the reasons you can be fired, it is possible that the employer could ask you to do something outside of the description at any time and fire you if you refuse)?  How resistant do you think this potential employer will be to give you a full description?  How likely is it that the employer will pull the offer if you push the issue?  How bad do you need the job?  Do you car if your new employer views you as a trouble maker or a  high maintenance employee?  Only you can weigh these factors and decide whether the issue is important enough to you to outweigh the risks.