Worked on backend development in Go, focusing on reliability improvements within the modelcontextprotocol/go-sdk repository. Addressed a critical bug where the progress token was lost if the Meta field was nil, which previously caused disruptions in progress tracking and downstream workflows. The solution involved updating the SetProgressToken logic to ensure the new progress map was correctly assigned back to the Params struct using SetMeta, preserving token continuity across operations. This fix reduced production risk and improved session stability for client services. The work demonstrated attention to detail in Go and backend systems, emphasizing robust state management and workflow reliability.