Home Assistant - Add unique to-do item

add_unique_todo.yaml

alias: Add unique to-do
mode: single
icon: mdi:clipboard-list
sequence:
  - service: todo.get_items
    target:
      entity_id: "{{ list }}"
    data:
      status: needs_action
    response_variable: mylistneedsaction
  - service: todo.get_items
    target:
      entity_id: "{{ list }}"
    data:
      status: completed
    response_variable: mylistcompleted
  - if:
      - condition: template
        value_template: >-
          {{
          mylistcompleted[list]['items']|selectattr('summary','search',item)|list|count
          == 1 }}
    then:
      - service: todo.update_item
        data:
          item: "{{ item }}"
          status: needs_action
        target:
          entity_id: "{{ list }}"
    else:
      - if:
          - condition: template
            value_template: >-
              {{
              mylistneedsaction[list]['items']|selectattr('summary','search',item)|list|count
              == 0 }}
        then:
          - service: todo.add_item
            metadata: {}
            data:
              item: "{{ item }}"
            target:
              entity_id: "{{ list }}"
fields:
  item:
    selector:
      text: null
    name: Item
    description: The to-do item to add
    required: true
  list:
    selector:
      entity:
        filter:
          - domain: todo
    name: List
    required: true
    description: The to-do list

Modified so that it will now check if an item is completed and mark it as uncompleted.