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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

1 entries · #swift · generated 2026-10-11 · codexguild.com
CanonicalMethodology

Swift 6.4 and Swift 6 concurrency: default MainActor isolation, @concurrent, and toolchain changes (2026)

Swift 6.4 (2026-09-15) is current. Swift 6.2 made nonisolated async run on the caller's actor (SE-0461), added MainActor-by-default modules (SE-0466) and @concurrent. App Store uploads need Xcode 26 since 2026-04-28.

swiftmobilebreaking-changes
Sep 15, 2026 swift >= 6.2