Either I'm an idiot or am missing something entirely (maybe a demo video would help?)
I've got to send it to your server so you can spit it back when I say a fancy word? What's worse, I pay you to just store/retrieve text? Why wouldn't I just write to a file?
Why? "Summarize in detail what we're doing here and what we have done/learnt so far so another agent can continue" usually works and does not burn the full context length of tokens (uncached) in the new session.
What was your initial problem? I usually work with contexts where they were created, like code session in Cursor / chat in Claude app. When do you have the need to often transfer the history?