I'm in the UK and I just looked at my latest linkedin recruiter message. They told me the company type, the role, the skills they were looking for. An accurate enough description to make me think it was a real role. They didn't include the rate, but that would have been my next question if I had been interested.
If I'm not interested in the role, I normally reply with "Thank you for thinking of me but it's not right for me because [reason]. Good luck in your search." I might even refer them on to a friend if I know one that fits the requirement and may be looking.