The summary communicates everything, really. It’s the first substantive thing that people will read on your profile and should communicate why you’re using the network. Have a Opening paragraph, 2nd and 3rd paragraphs alone with your contact information.
Describe your current position. By opening with this, you are telling your current employer that you are content. This won’t hurt you with recruiters because they will still contact you if they have a suitable vacancy. This again conveys that you are not actively looking to promote yourself, but it gives recruiters a good sense of your experience.
Next paragraph: Give a brief synopsis of your prior experience, again focusing on describing the facts rather than promoting specific accomplishments.
3rd paragraph: Describe why you enjoy your work.
4th paragraph: Summarize your education and any important work-related qualifications.
Contact information: Give your contact information