Does a Beholder eye ray break its Invisibility?

[BloodSnake'sCha]

Yes, but those (in the fashion of D&D) are specific exceptions. If they didn't say they were attacks, they wouldn't be. So you cannot use those to reason to anything else.

Exception based games require an explicit statement of exception to basic rules. And the basic rules require an attack roll for an attack. Changing that globally breaks...lots of stuff. Many many features and spells only react/trigger on attacks. Now they trigger on anything that might be considered a hostile action. That's a huge change.

So you get my point, good :)

So by RAW, the following do not break invisibility, right?

1. Blowing a horn to call reinforcements
2. Blowing a horn of blasting to smite your foes
3. Blowing a horn of blasting harmlessly into the air to call reinforcements

Those are all an "Action", not an "Attack (action)" (an attack action being, by RAW, a melee or ranged attack).
What about wands? A Wand of Binding lets you cast certain spells on command, or gain advantage on a roll. I assume you'd only pop out of invisibility if you use the Spells action and not the Assisted Escape action?

Also if it's house ruled that ability that triggers a save count as an attack, then yeah, that would cover stuff like beholder eye rays.

Basically, yes.