Code review
Every proposed change is a diff you accept or reject.
A proposal lists each file it would add, change or delete. For each you see a line diff with a few lines of context, and a checkbox. Apply accepted writes only the ticked files; Discard drops the whole proposal.
Before you accept, you can preview the proposal: the sandbox runs your files with the proposed changes applied, without saving them.
Proposals are checked before you see them: paths must follow the workspace rules and files must stay within the size limits. Anything else is listed as rejected.