I use it to list all my PRs, with icons for their approval/CI status alongside a list of PRs that are awaiting my review.

I like that the API is just outputting lines, but I wish there was more documentation.

I do the same thing, plus a few shortcuts I use a lot (open specific directories, clean directory etc).

Shortcuts to see or to run on clicking on it (which seems too much effort) ?

And how do you guys have so much space at the top? I only print my local IP address and its color ( red/blue) depending on whether my mitmproxy is running or not and I don't have whole lot of space left on my MBP 15".

Hot tip for more space in your menu bar: Bartender — https://www.macbartender.com/

Another option is Vanilla: https://matthewpalmer.net/vanilla/