in lisp the repl is the primary mode of development, you replace functions one at a time and only reload the whole system if you break structure layouts, and even then you don’t really restart the whole process (most of the time anyway, sbcl’s immobile code space is a bit of a pain) - agents can and do things by themselves, unprompted, which look like magic even if you’ve been piloting llms for as long as anyone here. I use gpt 6.1 sol for this, I’m sure opus would handle it perfectly, too.