[jingai]

Well, that's the problem then. I have no idea why she heard "play the addon" if you said "run addon," but that will most definitely not invoke the right handler.

FWIW, I just tried opening 10 different addons here with an incantation like so:

"Alexa, tell Kodi to run {addon}"

This is a less-than-ideal phrase too, as it has very few syllables to match on. But it worked for all but one (an addon with a short name on its own). Replacing "run" with "execute" or "open" successfully opened that one as well.

It seems odd that no matter if run or play was heard the utterance would result in "UnboundLocalError: local variable 'heard_artist' referenced before assignment"

I notice that addon was heard as 'add on'. Could the skill have been looking for an artist 'add' on the album 'pandoki'? That would explain the string heard_artist being involved but not why it crashed the skill with the unbound local variable error.

No, the problem is that, as you told us, she heard "play the addon" which will not execute an addon. The verbs to open an addon are: open, execute, or run. Play is reserved solely for playing media, the type of which depending on how you ask.

If you find that she actually hears "run addon" and it's still executing the ListenToAlbumOrSong intent, then something else is wrong. But from what you've told us thus far, it sounds like you're using the wrong verb, or she's hearing it wrong. Both are problems we can't do anything about in the skill itself.