---
- name: Prompt test
  hosts: localhost
  connection: local
  gather_facts: false

  vars_prompt:
    - name: "wut_want"
      prompt: "What do you want?!"

  tasks:
    - name: Debug wut_want if defined
      ansible.builtin.debug:
        var: wut_want
      when:
        - wut_want is defined
        - (wut_want | length) != 0