Worked on the slackapi/java-slack-sdk repository to enhance API flexibility and error reporting for Conversations Canvases. Delivered a feature allowing clients to specify a canvas title by adding a new field to the ConversationsCanvasesCreateRequest and integrating it into the API form data. Improved error diagnostics by introducing a detail parameter to CanvasesCreateResponse and CanvasesEditResponse, enabling clearer feedback for API consumers. Developed and maintained unit tests to ensure robust error handling during canvas creation and editing. All changes were implemented in Java, focusing on backend development, API integration, and unit testing, with careful attention to code quality and maintainability.