Commands:
/yeschat <message> | Staff chat
/yesmute <player> <seconds> | Mute a player for x seconds
/yesunmute <player> | Unmute a player
/yesclear | Clear chat

Permissions:
"yeschat.send" | Use /yeschat
"yeschat.mute" | Use /yesmute
"yeschat.unmute" | Use /yesunmute
"yeschat.clear" | Use /yesclear

Hope you like the Skript!