The noticeable issues are (1) unpredictable scrolling of the terminal window and (2) a super-buggy text box for inputting the prompt.
In particular if I mash the arrow key too fast while moving around and editing the prompt CC and my terminal's idea of where the cursor is get out of sync somehow and it's tricky to get them re-aligned, and I can't actually input text until I do. The vim mode lets me bypass this but it has its own bugs and is missing a ton of features that I expect. Visual selection in particular seems to be missing? Not entirely certain what things I'm used to are stock vim features vs Spacemacs features but I'm pretty sure visual mode is the former. Regardless, only the very basics seem to actually work. "w", "b", "e", "cw/b/e", "dw/b/e", "esc/i".
So for the most part I actually just edit CC prompts in emacs and paste them.
I resort to this workaround because I am very motivated to use Claude Code. For a less-useful piece of software I would probably just give up.
Is Ctrl+R usable at all? I've given up on it, the whole screen just starts scrolling madly most of the time. Not that I have to press Ctrl+R to get that bug to happen, it's just the most reliable way to do so.
And I've had the input box stuck not accepting input or not allowing me to delete past a certain point a hundred times. By now I know how to get it unstuck (although I couldn't tell you - my fingers figured it out but my brain doesn't know).