---
- name: Check script
  ansible.builtin.stat:
    path: /usr/local/bin/magos_on.sh
  register: script_stat

- name: Waf automata on
  ansible.builtin.command: /usr/local/bin/magos_on.sh
  register: result
  when: script_stat.stat.exists and script_stat.stat.executable

- name: Show result
  ansible.builtin.debug:
    var: result.stdout
  when: script_stat.stat.exists
...