Ansible: Execute task only when a tag is specified

Ansible 2.5 comes with special tags never and always. Tag never can be used exactly for this purpose. E.g:

tasks:
  - debug: msg='{{ showmevar}}'
    tags: [ 'never', 'debug' ]

In this example, the task will only run when the debug (or never) tag is explicitly requested. [Reference on ansible docs]

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