Worked on the langgenius/dify repository to enhance API tooling reliability by addressing JSON formatting compliance. Focused on Python-based API development, the main contribution involved removing support for single-quoted JSON strings during API tool testing, ensuring strict adherence to the JSON standard that requires double quotes. This change simplified the codebase by eliminating unnecessary edge-case handling, which reduced test failures and improved maintainability. The update also streamlined onboarding for new users by promoting consistent formatting expectations. Through targeted bug fixing and code refinement, the work contributed to a more robust and predictable API testing environment within the repository’s development workflow.