You give it access, it grabs your ssh keys and exfiltrate to some third party server. That is not the access the user gave to your platform but it is what it would be capable of doing.
https://simonwillison.net/2025/Jun/16/the-lethal-trifecta
Seems to me that these kind of systems, by design, tick all three boxes. I've had many discussions with people that let agent systems read and act on their incoming email for instance, and I think it's utter insanity from a security perspective.