Developer's 'Fixed' Auto-Update Script Failed Silently Every Week for Three Weeks

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A developer running a weekly automated Claude Code skills updater via macOS launchd discovered the script had been silently failing every Sunday for three weeks despite appearing fully patched. The automation, designed to run 'npx skills@latest update -g', had three defensive layers added over time: authenticated GitHub tokens to avoid API rate limits, a 10-minute timeout guard, and a success-only timestamp update to make failures visible. Detailed comments and audit notes in the code — including a logged 'measured 4m00s, exit 0' result from a prior check — created a false sense that the problem was resolved. The developer notes that verified fixes only prove a script worked at a specific point in time, not that it continues working afterward. The case highlights how well-documented automation can still mask ongoing failures if logs are not actively monitored after fixes are applied.

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