i let it run overnight against a windows app i was working on, and that got it from mostly not working to mostly working.
the loop was
1. look at the code and specs to come up with tests 2. predict the result 3. try it 4. compare the prediction against rhe result 5. file bug report, or call it a success
and then switch to bug fixing, and go back around again. Worked really well in geminicli with the giant context window