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The patch component in `swift-tools-version:6.2.1` has no effect on the available PackageDescription APIs, which are versioned by major.minor only. The actual minimum (Xcode 26.2 / Swift 6.2.3) is enforced by the `#if compiler(<6.2.3)` check in Package.swift. Using 6.2 also lets Swift 6.2.0 toolchains load the manifest and reach that check's descriptive error, instead of failing early with a generic tools-version mismatch.