During February 2025, Cy Takeuchi enhanced the kintone/js-sdk repository by refactoring the Application Settings API to improve type safety and clarity. He separated the titleField type definitions for GET and UPDATE operations, ensuring that each request type enforces the correct structure and semantics. This change, implemented in TypeScript, clarified the REST API surface and reduced the risk of incorrect usage when configuring application settings. By focusing on API development and type definitions, Cy enabled safer and more consistent API interactions for developers. The work demonstrated a thoughtful approach to type design, addressing ambiguity and improving the overall developer experience.