If you're working with JSON in Swift and need to serialize or deserialize custom types, this handles the Codable protocol implementation patterns. It covers JSONEncoder, JSONDecoder, and the related APIs you'd use to map between Swift structs and JSON payloads. Targets Swift 6.2 and iOS 26+, so it's built for current tooling. With 253 installs and 670 stars on the repo, it seems like a solid reference for the common encoding scenarios: custom keys, nested objects, date strategies, that sort of thing. Honestly, Codable is one of those things where you either remember the incantations or you look them up every time, and this makes the lookup part faster.
npx skills add https://github.com/dpearson2699/swift-ios-skills --skill codable-patterns