I have been using LLMs for coding a lot during the past year, and I've been writing down my observations by task. I have a lot of tasks where my first entry is thoroughly impressed by how e.g. Claude helped me with a task, and then the second entry is a few days after when I'm thoroughly irritated by chasing down subtle and just _strange_ bugs it introduced along the way. As a rule, these are incredibly hard to find and tedious to debug, because they lurk in the weirdest places, and the root cause is usually some weird confabulation that a human brain would never concoct.