I asked Claude to remove extra blank lines from a modified file. After multiple failed attempts, it reverted all the changes along with the extra blank lines and declared success. For good measure, Claude tidied up by deleting the backup of the file as well.
I only wanted to make the change in the ranges part of git diff and I got the syntax wrong on my own first attempt. Claude had been helping me with some much more complex tasks, so I thought removing white space would surely be no problem. Ha. Bad guess.