I was looking at CLI-only solutions a while ago and the best thing I found was to use something like revdiff: https://github.com/umputun/revdiff

For instance, in Claude Code you can have it bring up this TUI overlay after every edit it makes (it literally is an overlay, rather than a separate tab in your terminal) and you can annotate line-by-line anything you want changed or rejected. Then once you exit the overlay those suggestions are automatically piped back into the agent.

I tried a few of these TUI-based code annotators, and this one is by far the best. It also works for files not under version control.

I'm currently not using it as I also prefer something more akin to "text editor with agent built in", but I wanted to mention here in case you were curious.