Cursor 3 Puts an Agents Window Where the File Tree Used to Be

Cursor's 3.0 release, codenamed Glass, replaced the old Composer side pane with an Agents Window as the primary interface. You open Cursor and the first thing you see is a list of running agents working across local repos, git worktrees, cloud sandboxes and remote SSH sessions, not a file tree.

The code editor still exists, but it has been pushed to second place. You dip into a file to check or nudge one agent's work, then you go back to the list and start another one on a different branch. Several agents can run at once, each isolated in its own worktree, so they are not stepping on each other's changes.

Most of the coverage around Cursor 3 focuses on the model quality bump. We think that misses the more interesting change. Autocomplete getting better is an incremental win. Redesigning the whole application around parallel running agents, and treating the editor as a secondary view into their work, is a statement about what an IDE is for now.

It also changes how you plan work. Instead of opening one file and writing one function, you are dispatching several tasks at once and checking back in, closer to managing a small team than typing code. Whether that suits your workflow or not, it is worth trying Cursor 3 just to feel how different that home screen is.