Check a software package before installing it: whether it exists at all (AI coding assistants sometimes invent names), latest version and release date, package age, number of versions, weekly downloads (npm), licenses, deprecation, and known security advisories with severity. Returns a verdict of ok, caution or not-found with the reasons. Covers npm, PyPI, Cargo, Go, Maven and NuGet. Use before adding a dependency or running an install command.

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