@SoniEx2 wants me to have PRIVMSGs sent by bots be bracketed with "[bot]\x01CW0 " and "\x01", which, under a proposed CTCP extension of theirs (SoniEx2/CTCP-S#7), would result, if I understand correctly, in supporting clients rendering the message as hidden by default, prefixed with the text "[bot]".

As far as I am aware (and as far as @SoniEx2 has said) no clients currently implement this CTCP extension, and in WeeChat at least I see the bracketing strings come through mostly unchanged (the one change being that the start-of-heading characters are shown as ␁ SYMBOL FOR START OF HEADING), thus:

2018-08-30 01:41:50 <SoniEx2> [bot]␁CW0 example␁

I am open to adding an option for having bots bracket their messages like this, but I'm loath to make it the default with neither wide client support nor popular demand.