I tried to inform myself about extensions and the Extension Chat API thoroughly. But still I have some questions I could not find a definitive answer to:
are Extension Chat messages shown on the official mobile apps (Android, iOS)?
i found a Bug Report in the Dev Forum about the Twitch Chat Popout → is this confirmed to show the extension chat messages by now?
as Extension Chat messages are not delivered via IRC, 3rd Party Tools that streamers use to read chat (Chatterino, Screen Overlay, OBS, Streamerbot, etc), are not supported and messages will not visible there?
Appreciate your help on finding the “current state” regarding these questions.
Not tested recently myself to know either way, but not seen any reports link to the report? Working for me
That is correct and unchanged.
If extensions wish to support other tools then extensions should provide and API for other tools to consume as needed.
Generally you would expect streamers to be aware of what an extension does by other means to be honest. (like the alert going off on the stream or whatever the alert is for to be provided via the extension control panel/etc or like iof the extension talks to a game the game to throw up a prompt visibly for the caster as their eye line is in the game not chat)