instead of piping several "vars" just use ","

var %a = 1, %b = 2, %c = 3
and even then i dont think the "="'s are needed.

why 452? i think different servers use different limits.

an alias/identifier, would be nice
example:

alias msg.limit return 452

then in script, you can do $msg.limit
and people can edit that alias/identifier as they wish.

oh also, in your description, you should add that the usage is
$chan
and i may be wrong but there is no need to tokensize, since your outgoing msg is already tokened by spaces.

heres a version of this i wrote a while ago

alias check.len {
  var %aa = $1-
  if ($len(%aa) <= 250) { msg $chan %aa }
  else {
    var %a = 250, %b = $len(%aa)
    while (%a <= %b) {
      msg $chan $iif(%a == 250,$left(%aa,%a),$right($left(%aa,%a),$calc(%a - 250)))
      if (%a < %b && $calc(250 + %a) > %b) { msg $chan $right(%aa,$calc(%b - %a)) | halt }
      else { inc %a 250 }
    }
  }
}