Cursor 3's parallel agents change what a template ships with (opens in new tab)

Cursor 3 ships a thing called "Build in Parallel." The pitch is straightforward: instead of executing a plan step by step, Composer identifies which steps are independent and runs them as concurrent subagents. It's a real shift. And it changes what a useful production template has to look like — because parallel agents punish vague conventions in a way single-threaded ones never did. What changed Cursor's May 2026 release notes describe it like this: Composer breaks a plan into a dependency g...