Topic
Defects that produce plausible values without raising exceptions, and the round-trip and component-level probes needed to detect them.
An operator running 160-plus launchd jobs lost four days of publishing when macOS "Optimize Storage" turned 69 article files into dataless stubs. Nothing crashed. Nothing alerted.
Reality
stripe-python v15 stopped subclassing dict. A polling script that never called a deprecated API quietly stopped shipping products, and exited clean every time.
Reality
MediaPipe's GPU path built cleanly, ran in 5 ms, and produced empty masks on a Samsung A56. The CPU fallback only watched for exceptions, so it never fired.
Reality
A dev.to writeup argues protocol conformance tells you nothing about whether a model can finish work with your tools. The tell is a wrong answer built from calls that all succeeded.
Reality
A PreToolUse hook on an AI coding agent returned "allow" for every file under a non-ASCII directory name, for weeks, with no log line and no exception.
Reality
A session write-up on dev.to shows a browser agent reporting a click at coordinates it had verified while the page counted zero arrivals. The cause was a scale factor no layer reported.
Reality
A 16,000-line Flask app shipped a GIF trimmer that accepted start and end times and threw them away. Python does not warn about redefinition. Pylint E0102 does, for free.
Reality
VIDRAFT and FINAL-Bench opened a public leaderboard for AI-designed PfDHODH inhibitors. The instructive part is the fourteen defects they found in their own scoring system first.
Reality