Worked on the langgenius/dify repository to enhance backend reliability and type safety by consolidating two major refactoring efforts into a single feature. Focused on Python API development, the work replaced a redundant dictionary with an EmojiIconDict in the Tool Manager’s icon URL generation, reducing potential key errors and improving maintainability. Additionally, API error handling was refactored and Pyright type checking was enabled for previously untyped decorators, allowing for earlier detection of issues and stronger type discipline. These improvements laid the groundwork for safer UI icon handling, more robust API contracts, and easier onboarding for future contributors to the codebase.