Each needs to define an autocomplete script. oh-my-zsh provides plugins that do that for common tools like git.

Those scripts are usually supplied by the CLI tool itself. For example for terraform: https://www.terraform.io/docs/cli/commands/index.html#shell-...

This is the closest I see: https://github.com/ohmyzsh/ohmyzsh

Since switching to it from the default shell of Mac OS terminal (zsh I think) I have found it immensely productive. Some of the things it does seem Magic like auto completing uncommitted files when I say “git add <tab>”

ohmyzsh is a plugin manager for zsh, not a different shell.

You need no tool at all as you can do I reverse search in any shell with ^R. If you want to do it with a better UX you can use fzf. If you want the suggestions you can use zsh-autosuggestions or fish shell. Setting them up is straightforward. And if you want an example config for Zsh you can look mine. Zinit, the package manager, automatically load/install the plugins when loading the shell.

https://github.com/danisztls/dotfiles/blob/main/shell/zshrc

Maybe https://github.com/junegunn/fzf

Fish does that by default

I really like Navi