"Template variable warning: 'title' is undefined when rendering '{{ title }}'"

Configuration
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1

I’m very new to HASS, and am fiddling around with intents.

I’m trying to have it play music titles using youtube music. I was able to get this to work by building a custom integration, then an automation that matches on fixed sentene structures. I can add multiple sentences, but I wanted to have it match more loosely, so I give it a coupe example sentences and the llm (in my case Google Generative AI) will match it with the intent.

So I created the following media.yaml file in ./homeassistant/custom_sentences/en:

language: "en"
intents:
  PlayTitle:
    data:
      - sentences:
        - "Play {title} on YouTube Music"
        - "Play the song {title} on YouTube Music"
        - "Can you play the song {title} on YouTube Music"
        - "Get the song {title} on YouTube Music"
        - "I want to listen to the song {title} on YouTube Music"
        # more examples...
        slots:
          domain: "title"
        requires_context:
          area:
            slot: true
lists:
  title:
    wildcard: true

Then I created ./intent_scripts.yaml

PlayTitle:
  description: "Play a song on YouTube Music"
  action:
    - service: youtube_music.play_song
      data:
        title: "{{ title }}"
  speech:
    text: "Playing the song {{ title }} on YouTube Music."

And my configuration.yaml looks like this

...
ytmusic:
conversation:

intent_script: !include intent_scripts.yaml

ytmusic is my custom integration.

So I tested it out by saying something like “Can you start {title} on Youtube Music?”, and the agent replies that it’s playing, but in the logs console I just see this
Template variable warning: 'title' is undefined when rendering '{{ title }}'
Template variable warning: 'title' is undefined when rendering 'Playing the song {{ title }} to Youtube Music.'

I’ve really been struggling having my intent_script get access to the title. Does anyone have any suggestions or advice?