How can I check if my MacBook Pro is shut down without turning it back on? Sometimes I like to shut down my Macbook Pro (e.g. if I know I won't be using it for some time and I want to save battery).

Unfortuantely, I can't figure out any way to actually check that it's shut down when the lid is closed. There's no visible signal from the outside, and if I open up the lid, then due to (what I consider to be) a terrible design decision, it automatically turns back on. I then have to wait quite a few seconds before I can manually shut it back down again.

Is there a way I can either (a) see whether it's completely shut down without opening the lid, or (b) disable the automatic boot up upon opening the lid?
Shut down before you close the lid.

Set the lid behavior so that it does not auto wake.

I set that behaviour when I want to clean the keyboard but you have to avoid the power button...