rexdiff

Review what your coding agent changed, without leaving Rex.
Think herdr-reviewr, but for Rex.

Why

The diff opens in a Rex pane beside the agent, so you don't switch apps.
The last-turn scope shows only what the agent changed in its most recent turn.
Press s and rexdiff pastes your comments into the agent's input, each with its file and line.

brew tap rednafi/rexdiff https://github.com/rednafi/rexdiff
brew trust rednafi/rexdiff
brew install --cask rexdiff
rexdiff install

Then press Shift+Cmd+R next to an agent.