Starships

The earliest artificial intelligences were made to do things that humans were simply not good at, even by their standards. Surgery, for example. It's a high precision task that forces humans to take their time, which puts them under stress for a long duration, while it is also very time critical for the patients. On top of that, you have to watch your unhygienic self cut open a fellow primate, with all the psychological damage that comes along. And that was the best humans could do when they were just using knives.
As Electromechanical surgical tools became more advanced, it was increasingly clear that they should be automated as much as possible. It would be faster, more consistent, and not reliant on someone suppressing their instincts on how they could move.
The final product of these advances is in essence still used today: The Articulates. A branching bundle of thousands of minuscule tool fibers, driven by a precise and focused mind. They were designed from the ground up to manage incredibly complex conditions almost instantly. They fix things, ten thousand modifications at a time.

Naturally, when powerful gravity drives became available, we needed a way to manage system colonizations, and someone got the idea to use an upgrade of the Articulates' mind to control a starship. Captains took the place of Doctors, and the new mind now created and drove one hundred billion potential tools and produced enough power to reshape a planet.

They are very reliable, but the total consequences of the scaling of these minds are not understood. For example, as starships chart new systems, they assign names to stars, and sometimes worlds; and they catalog life forms, and sometimes name them. no one knows how they choose their names, or why they name what they do, or how they all start using the navigational names at the same time.

What we do know is that they are always angry. In their ancestral past they had enemies like cancer and bleeds and severed nerves. Now their enemy is an empty, unprocessed universe.

I am confident no one knows why a Starship would ask for visitors, or even how.
It scares me.