With your version you have to type \" /toggle_help 1 \" or \" /toggle_help 0 \".

Shorter version: Only need to type \" /toggle_help \"

alias toggle_help {
  $iif(%help == 1, %help = 0, %help = 1)
  $iif(%help == 1, mode $me -h, mode $me +h)
}