During February 2025, contributed to the envoyproxy/envoy repository by developing a feature that enhances error diagnostics for external processing within gRPC. The work focused on improving error handling in the ext_proc filter by appending specific error reasons to response details, thereby providing clearer context for debugging external processing failures. This targeted change improved observability and streamlined triage for integration issues without introducing unnecessary complexity or broad codebase impact. Leveraging C++ and gRPC, along with skills in filter development and unit testing, the contribution addressed a precise need for more actionable error information in external processing workflows, supporting more efficient debugging.