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A Claude Code skill that compares the environment variables your code actually reads against what is declared and what is really set in your deploy target. Its most valuable pass finds silent fallbacks: the `?? "default"` that turns a missing key into wrong behaviour instead of a crash, so emails quietly stop sending or a shared rate limiter reverts to per-process and stops limiting. Also flags secrets sitting behind public prefixes, which are baked into your client bundle and already leaked.