Being a co-maintainer, I'm a bit biased, but I think you should try Ghostel (https://github.com/dakra/ghostel) if you aren't already. And if you are, you should report bugs so we can fix them :)
Otherwise, I think the main advantage over Vterm and other Emacs terminal emulators is that it handles modern fancy TUIs a lot better than Vterm. It's backed by libghostty-vt so supports all the new fangled escape codes. It has a bunch of tricks to force fallback glyphs to the terminal monospace grid to remove the flickering effect when the glyph cells change size during TUI animations, most notably in Claude Code. Btop and Yazi runs great too, if you're into that sort of thing.
Plus a bunch of other things!
Besides the performance and what baokaola already mentioned some things that make Ghostel better than vterm especially when working with those cli agents are:
- proper handling of resizing windows
- progress reports (you get a spinner in the modeline when claude thinks)
- notifications (get an alert when your agent is done)
- drag and drop works
- hyperlinks. urls and files are clickable
https://lawsofux.com/postels-law/
https://en.wikipedia.org/wiki/Robustness_principle
>In computing, the robustness principle is a design guideline for software that states: "be conservative in what you do, be liberal in what you accept from others". It is often reworded as: "be conservative in what you send, be liberal in what you accept". The principle is also known as Postel's law, after Jon Postel, who used the wording in an early specification of TCP.[1]
>In other words, programs that send messages to other machines (or to other programs on the same machine) should conform completely to the specifications, but programs that receive messages should accept non-conformant input as long as the meaning is clear.
I thought it was named Ghostel because of Ghostty and EL (emacs lisp).
It was. But I like the Postels law relation as well :)
cf agent-shell which uses the agent-connection-protocol and provides its own interface.