-"C(noop) (added in 2.0) This literally does 'nothing'. It is mainly used internally and not recommended for general use."
-"C(clear_facts) (added in 2.1) causes the gathered facts for the hosts specified in the play's list of hosts to be cleared, including the fact cache."
-"C(clear_host_errors) (added in 2.1) clears the failed state (if any) from hosts specified in the play's list of hosts."
-"C(end_play) (added in 2.2) causes the play to end without failing the host."
-"C(end_play) (added in 2.2) causes the play to end without failing the host(s). Note that this affects all hosts."
-"C(reset_connection) (added in 2.3) interrupts a persistent connection (i.e. ssh + control persist)"