Yang Houle focused on enhancing the stability and reliability of the coze-dev/coze-loop repository by addressing a persistent Azure API 404 error related to OpenAI integration. He resolved the issue by correcting the OpenAI protocol configuration and updating the relevant JSON field names, which enabled support for JSON schema response formats. Working primarily in Go, Yang strengthened the backend by expanding test coverage to prevent future regressions and laying the groundwork for schema-based validation. His work demonstrated depth in API integration, backend development, and error handling, resulting in a more robust and maintainable OpenAI protocol within the project.