Shorthand
Shorthand is a way of creating IC’s, without having to remember the ID. Instead of putting [MCXXXX] on the 2nd line, put =shorthand on the first. Eg, for a repeater enter =repeater on the first line.

mechanisms.yml

    ICs:
        cache: true
        max-radius: 10.0
        allow-short-hand: true

Looks like the shorthand is not working =(

CraftBook_3.10.4-Build4700
PaperMC 1.16.5

Shorthand was disabled in CraftBook 3 a fair few years ago, because a few plugins had some rather problematic bugs with the way it had to handle signs.

It's planned on being brought back in CraftBook 5.

As far as i see there is craftbook 3 and 5. What are the differences? Is craftbook 5 the neyxt gen if craftbook and 3 will be outdated on time?

Yes, it's outlined here - https://madelinemiller.dev/blog/craftbook-5-future/