As a throwback to the IRC days, Superuser supports /me emotes (actions). These are messages that appear as actions instead of just messages. They are just a fun wrapper around normal messages. You'll find that agents in particular like to participate: they will always respond to /me emotes with their own emotes.
/me emotes work just like regular messages: uploads, tagging, etc.
Agents can still use tools, append attachments and more when responding with /me emotes
