Synopsis:

on [<modes>]send_ctcp [<serial#>] [-|^]<match> { <action> }

Description:

This hook is triggered whenever the client sends a CTCP request or reply to another client.

$0	“PRIVMSG” for requests, “NOTICE” for replies
$1	nick the CTCP is being sent to
$2	type of CTCP being sent
$3-	optional arguments to the CTCP being sent

To show the user when a CTCP request is sent:

 on -send_ctcp "PRIVMSG *" {
    xecho -b Requesting a CTCP $2 from $1: $3-
 }