I write mine to fit on a single screen without scrolling. In a standard word processor, that's about 300 words. It forces a brutal economy of language. Every sentence must advance the core plot. It starts with a logline, then expands into three acts. Act One: Who is the character, what do they want, and what forces them to act? Act Two: What are the major obstacles and the midpoint reversal? Act Three: What's the climax and how is the character changed? I don't name more than two supporting characters. The setting gets one descriptor. It's skeletal, but if the skeleton is strong and interesting, the agent will want to see the body of the manuscript.