Worked on the microsoft/clarity repository to address a critical issue with UA-Client Hints, focusing on improving browser brand data accuracy and optimizing hint request efficiency. Using TypeScript and Playwright, implemented a mapping correction from brand.name to brand.brand, which eliminated undefined values in Chromium-based sessions. Deprecated uaFullVersion and redundant platform hints were removed to streamline data payloads and reduce unnecessary requests. Expanded end-to-end Playwright tests validated UA-CH properties against actual browser values, enhancing test coverage and reliability. Documented UA-CH specification 3.1 considerations in code comments to support future maintenance and ensure ongoing compatibility with evolving web standards.