Reading the submission guidelines of numerous agents, many ask that a query "tell us the entire story--from beginning to end. We want (need) to know what happens." They specifically say they don't want anything akin to jacket copy or two intriguing paragraphs. Obviously, were one going to query these agents, one would follow their guidelines.
I've poured over helpful websites including Writer's Digest and, of course, Query Shark. I've deduced that you prefer the jacket copy/two intriguing paragraphs type of query.
If, however, a particular agent's submission guidelines simply say, "Send your query to such and such email and include the first 5 pages..." without expressing a preference, which is the appropriate way to go? Two intriguing paragraphs? Or a full on synopsis?
I'm astonished to learn that someone wants a full on plot synopsis in a query. I've never heard of such a thing! However, if that's what the guidelines say, follow them.
Absent instructions to the contrary, send only the enticing two paragraphs that introduce the main character and the plot. Entice the reader to want more. The reason that QueryShark asks for that is because that's what most agents want.
I'm interested to see who these "many" are that ask for the entire story. Send me the links to the sites if you can dig them up without spending too much time on it.