@FAIL

@fail <object> [ = <message> ]

<object> can be a thing, player, exit, or room, specified as <name> or #<number> or 'me' or 'here'. Sets the fail message for <object>. The message is displayed when a player fails to use <object>. Without a message argument, it clears the message. This is the same as: '@set <object>=_/fl:[text]'.

See also: @ofail and @describe.