Worked on enhancing Tool Call Handling in the cloudwego/eino repository by developing a reverse-traversal-based patching mechanism to prevent duplicate tool calls and improve the accuracy of tool responses. Leveraged Go for backend and API development, introducing set-based tracking to avoid dangling patches and filtering logic to process only relevant subsequent tool result messages. Expanded test coverage to include edge cases such as nil content blocks in user messages, ensuring robust and predictable tool call flows. Refactored and simplified the codebase by removing unused packages, which improved maintainability and supported scalable automation for future development in the messaging system.