The quest in Bartali's Adventure Log Book 13 should be Summon and kill Agrakhan. In fact, it consists of killing the much stronger Cadry Gatekeeper, which is located right next to the place where Agrakhan is summoned. Is this intended? Cadry Gatekeeper kills me every time after a few seconds of entering the area. He is stronger than World Bosses. I can't even start this quest. Was that the intention?

Gate keeper not always there, try other channel, in fact you can summon agrakhan w/o agroing GK.

I changed servers many times, I also tried on seasonal ones, he was everywhere, but of course I will keep checking, I care about finishing the task

Over a year ago I reported to change the spawn location of Agrakhan because it is blocked by Cadry Gatekeeper that the average player will not beat, and hardly anyone kills these gatekeepers for this reason.

So you only have two options: fight cadry gatekeeper for 30 minutes or count on luck and the channel where someone killed him.

I was lucky, indeed after various attempts I hit the right time and server, there was no GK, I finished the task