Worked on the cloudwego/eino repository to enhance error handling and observability within the graph execution workflow. Developed and delivered a feature that introduced the Unwrap method to the internalError type, enabling error chaining and clearer error propagation throughout the system. Complemented this with a targeted unit test to validate context cancellation during graph execution, thereby strengthening test coverage and reliability. Leveraged Go for both implementation and testing, applying error handling best practices and test-driven development. These changes improved error visibility, accelerated root-cause analysis, and contributed to more robust and maintainable graph execution paths without addressing any major bugs.