During August 2025, Eryu contributed to the grpc/grpc repository by focusing on stability and interoperability at the intersection of C++, Objective-C, and Swift. Eryu addressed a crash in CFStreamEndpointImpl::Shutdown by ensuring the client was unset only once, which improved resource management and prevented double-unsetting errors. Additionally, Eryu enhanced concurrency safety for Swift clients by marking the getTokenWithHandler block parameter as NS_SWIFT_SENDABLE in GRPCAuthorizationProtocol, strengthening thread-safety across the Objective-C and Swift boundary. These targeted changes demonstrated depth in crash prevention and interop robustness, directly improving reliability for production users and reducing risks in mixed-language environments.