I've actually heard a plausible theory about the TUI being janky, that being that they avoid use of the alternate screen feature of ANSI (and onwards) terminals.

The theory states that Anthropic avoids using the alternate screen (which gives consuming applications access to a clear buffer with no shell prompt that they can do what they want with and drop at their leisure) because the alternate screen has no scrollback buffer.

So for example, terminal-based editors -- neovim, emacs, nano -- all use the alternate screen because not fighting for ownership of the screen with the shell is a clear benefit over having scrollback.

The calculus is different when you have an LLM that you have a conversational history with, and while you can't bolt scrollback onto the alternate screen (easily), you can kinda bolt an alternate screen-like behaviour onto a regular terminal screen.

I don't personally use LLMs if I can avoid it, so I don't know how janky this thing is, really, but having had to recently deal with ANSI terminal alternate screen bullshit, I think this explanation's plausible.

> Claude Code is clearly a pile of vibe-coded garbage. The UI is janky and jumps all over the place, especially during longer sessions. (Which also have a several second delay to render. In a terminal).

Don't you know, they're proud of their text interface that is structured more like a video game. https://spader.zone/engine/

> Lately, it's been crashing if I hold the Backspace key down for too long.

Golden opportunity to re-enact xkcd 1172.

Imagine being Anthropic and opening yourself up to the deluge of CC-coded PRs by all of your users.

As a point of reference, I’m a heavy cc user and I’ve had a few bugs but I’ve never had the terminal glitches like this. I use iterm on macOS sequoia.