My Demo Script Found a Production Bug on Its First Run: A Tiny Post-Mortem
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I built a demo script to show off a project. It failed on step 2 — and in doing so, it found a real bug that had been sitting in the codebase the whole time, invisible to a fully green test suite. This is a short technical report on what happened, why the tests missed it, and what it taught me about validating against remote APIs. Total incident cost: about ten minutes. Lessons: worth writing down. Context The project is an MCP (Model Context Protocol) server that wraps Google's…
1Key Takeaways
- I built a demo script to show off a project.
- It failed on step 2 — and in doing so, it found a real bug that had been sitting in the codebase the whole time, invisible to a fully green test suite.
- This is a short technical report on what happened, why the tests missed it, and what it taught me about validating against remote APIs.
- Total incident cost: about ten minutes.
2AIWedia Score
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — AI reports that i built a demo script to show off a project.
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