The Standard Rules define this action in only a minimal way, blocking it with a check rule which stops it in all cases. It exists so that before or instead rules can be written to make it do interesting things in special cases. (Or to reconstruct the action as something more substantial, unlist the block rule and supply carry out and report rules, together perhaps with some further check rules.)
Typed commands leading to this action
"think"
Rules controlling this action
instead doing anything except preparing, finding responses to, giving text for, giving link to, taking inventory, examining, looking, thinking, smelling, listening to, waiting when the player is yourself and the Yes or No Boolean is false
instead thinking in the Introduction
instead thinking in the Lake of Boiling Magma
check an actor thinking block thinking rule