[SOLVED] How do I get the timer to sound when finished?

[hollow fable]

Goal:
My goal is to be able to say "Set a timer for X time" and have HA sound a tone on the satellite where I set the timer. Currently, I can say "Turn on the light in X minutes" and it works a treat.

Current Behaviour:
When I ask it to set a timer for one minute, it replies with "Timer set for one minute". After a minute there's no alarm or audible notification. There is no screen on these satellites.

Overall I'm very happy with the speaker setup, it works well.

System info:
I'm running HAOS 15.2 (supervised) and up to date in a virtual machine.
I've recently built up several Wyoming Protocol speakers for Home Assistant. They're using a Raspberry Pi Zero 2W, a ReSpeakder Seeed studio mic hat and a speaker. Works a treat for controlling HA.

Conversation agent settings:
The conversation agent is set to ChatGPT with "Prefer handling commands locally" enabled to help work even if the internet is down.
Speech to text is faster-whisper, language English
Text to speech is handled by Piper (I really like the "Danny (low)" voice)

[broken summit]

You have to add timer sound setting in your Wyoming service command.

--timer-finished-command

[hollow fable]

Awesome, thank you! Seems to me there should be a default included seeing that works. I'll look into how best to request it so other folk have it easier.