Worked on the coze-dev/coze-loop repository to enhance the reliability of OpenAI integration within the model module. Focused on backend development using Go, the work involved delivering a targeted bug fix that ensures the response format is only applied when the ResponseFormatType is explicitly provided, thereby preventing errors caused by empty fields. This approach improved input validation and introduced more defensive coding practices, reducing the risk of runtime failures and exception spillover. Additional efforts included expanding test coverage for OpenAI error scenarios, which supports greater production stability and customer value. Core skills applied were API integration and backend development.