One window reviews a workspace's diff, edits its files, and sends line comments to whichever coding agent is running there.
Open the Editor with ⌘⌥E or "Open in Editor" on a sidebar row. There is one Editor window: it follows the sidebar selection and remembers each workspace's own saved mode; the first time it opens a workspace, a Git workspace starts in Diff and a folder workspace in Editor. Stopping or restarting the workspace it shows doesn't close it.
The toolbar's Compare button names the current scope and opens a menu: "Uncommitted", "Last commit", a "vs <base branch>" preset (only when the workspace has a configured base branch), "Branch…", or "Commit or ref…".
Files and Changes lists show each entry with a file-type icon. ⌘P opens a file by name. A file or folder row's context menu offers "New file", "New folder", "Rename", "Move to…", and "Delete", plus "Open in system viewer" for a file the Editor can't open as text (workspaces on this Mac only). Edits save themselves about 0.8 seconds after you stop typing; ⌘S saves at once.
In Diff mode, clicking a line's gutter opens a draft comment card with a primary "Send to <agent>", which sends it right away, and a secondary "Add to batch". The toolbar's "Send batch · n" button sends every draft with text, whether or not it was marked batched.
Settings → General → "Preferred editor" lists Built-in first, then whichever of VS Code, Devin Desktop, and Zed are installed on your Mac. With another editor chosen, ⌘⌥E and "Open in Editor" open the workspace there instead of the built-in Editor window.
