Developer Fixes Hidden Multi-Agent State Bug After Cloud Run Demo Masked the Flaw

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A developer building a multi-agent environmental monitoring system for Google's All Things Agentic Hackathon discovered a critical architectural flaw only after questioning why a successful live demo had actually worked. The orchestrator was storing shared risk-event state in local process memory, meaning correlation detection only functioned correctly when Cloud Run happened to route requests to the same instance — a behavior that is never guaranteed under real traffic. Beyond the state bug, two of the three original monitoring sites lacked verified real-world survey data, which would have undermined the project's core claim of site-specific calibration; the developer replaced them with fully documented survey locations in the Niger Delta. Both issues were properly resolved: shared state was migrated to Firestore for consistency across instances, and site data was verified against independently published sources. The developer concluded that a passing demo and a correct implementation are not the same thing, and that silent failures with no error output are the hardest category of bug to catch.

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