add_host doesn't add hosts to new group

add_hosts_problems

 hosts: all:!undef_broken:!undef_missing
  gather_facts: false
  tasks:
    - add_host: name={{ inventory_hostname }} groups=alive
      when: "'broken' != '{{ state }}' and 'missing' != '{{ state }}'"

    - shell: echo " define 'alive' for host {{ inventory_hostname }}"


###### when run:
PLAY [all:!undef_broken:!undef_missing] *************************************** 

TASK: [add_host name={{inventory_hostname}} groups=alive] ********************* 
creating host via 'add_host': hostname=svab1
added host to group via add_host module: alive
ok: [svab1] => {"new_groups": ["alive"], "new_host": "svab1"}

TASK: [shell echo " define 'alive' for host {{inventory_hostname}}"] ********** 

changed: [svab2] => {"changed": true, "cmd": "echo \" define 'alive' for host svab2\" ", "delta": "0:00:00.002368", "end": "2013-09-23 08:57:12.168056", "rc": 0, "start": "2013-09-23 08:57:12.165688", "stderr": "", "stdout": " define 'alive' for host svab2"}
changed: [svab4] => {"changed": true, "cmd": "echo \" define 'alive' for host svab4\" ", "delta": "0:00:00.002228", "end": "2013-09-23 08:47:43.311019", "rc": 0, "start": "2013-09-23 08:47:43.308791", "stderr": "", "stdout": " define 'alive' for host svab4"}
changed: [svab1] => {"changed": true, "cmd": "echo \" define 'alive' for host svab1\" ", "delta": "0:00:00.002531", "end": "2013-09-23 08:57:12.211899", "rc": 0, "start": "2013-09-23 08:57:12.209368", "stderr": "", "stdout": " define 'alive' for host svab1"}
changed: [svab3] => {"changed": true, "cmd": "echo \" define 'alive' for host svab3\" ", "delta": "0:00:00.002390", "end": "2013-09-23 08:48:58.542964", "rc": 0, "start": "2013-09-23 08:48:58.540574", "stderr": "", "stdout": " define 'alive' for host svab3"}