Every thread shows its own changes inline, as a diff, right where the conversation happened — you never have to go hunting for what an agent actually touched.
The History tab zooms out to the whole workspace: a single running diff across every repository attached to it, from wherever the workspace branched off to right now. It's the fastest way to answer "what has actually changed here so far?" without scrolling back through every thread.
The Files tab lets you browse and edit the activated worktree directly, the same as any code editor — useful for a quick fix that doesn't need a whole conversation, or for reading a file an agent mentioned without leaving the app.
That covers changes to your code. For changes to the setup around it — when a workspace stopped pointing at a repository, who edited an Agent's prompt and to what — see Revision history.