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On the other hand, ai agent harnesses work a bit like image based system - think: claude --resume

Unless you give them a tool which lets them execute arbitrary code in the running image.

Or at least this works wonderfully in Clojure via the nREPL.

On the contrary, when using SaaS based programming environments, aka iPaaS, it really feels like using Smalltalk and Lisp images.

With a very big difference, at least I could backup Smalltalk and Lisp images.