Worked on the modelcontextprotocol/typescript-sdk repository to deliver a focused API surface cleanup, targeting the Validator Providers interface. The effort centered on restricting root-level type declarations, ensuring validator provider classes were no longer exposed at the root and instead accessible through designated subpaths. This approach reduced API ambiguity and the risk of misconfiguration, streamlining developer onboarding and usage. The implementation followed project conventions, with collaborative code review and adherence to contribution guidelines. Utilizing TypeScript, API design, and testing skills, the work improved commit traceability and hygiene, resulting in a more stable and maintainable SDK without introducing new bugs or regressions.