Worked on the huggingface/swift-transformers repository to enhance concurrency support by adding Sendable conformance to the Hub.Repo and Hub.RepoType types. This update enables these types to be safely used across actor and task boundaries in Swift 6, supporting more robust async workflows and safer caching without altering existing behavior. The implementation maintained immutability and Codable compliance, ensuring no public API changes or regressions. The work involved careful code review and collaboration, leveraging Swift 6 concurrency features and a strong understanding of value semantics. This contribution lays the foundation for broader concurrency adoption and improved async safety within the codebase.