I'm not sure I understand correctly, muds are text based but not file based. But there are several mud clients available with different features. Most include an auto mapper for example, you can connect through different specialized protocols to your favorite mud server.
Example clients: Mudlet, zMUD, kMUD, mushclient
I looked at Mudlet https://www.youtube.com/watch?v=c1Llvwy0Y_Y&list=PLA40A1E6E5...
It's still text based in sense of `look at monolith`.
> Discord slash commands are interactive bot commands activated by typing / in the chat, prompting an inline menu of options and parameters.
Discord uses slash commands to visually autocomplete possible parameters.
> https://developer.apple.com/design/human-interface-guideline...
Apple uses contextual actions to limit freeform grammars.