Rule of thumb: only use it for one or two runs and that's it. after that back off because then Claude Code is then just going to start vomiting fecal matter from the other fecal matter its consumed.
If it can't nail something on the first or second go, don't bother. I have clients that have pushed it through those moments and have produced literal garbage. But hey I make money off them so keep pushing man. I got companies/clients that are so desperate to reverse what they've done that they're willing to wait until like March of next year when I'm free.