echo-task.yml

- name: Echo something
  shell: echo "Hi"

test-echo.yml

#!/usr/bin/env ansible-playbook

---
- hosts: localhost
  # switch between vars and vars_prompt, and I would expect the same output both times
  #vars:
  #  should_echo: True
  vars_prompt:
  - name: should_echo
    default: True
    private: no
    prompt: "Should I Echo it?"
  tasks:
  - debug: var=should_echo
  - include: echo-task.yml
    when: should_echo == True