During February 2025, contributed to the microsoft/STL repository by implementing granular control over AddressSanitizer (ASan) annotations for allocators in C++. Developed a template parameter, _Disable_ASan_container_annotations_for_allocator, allowing per-allocator opt-out of ASan container annotations within internal vector and string implementations. This approach provided finer configurability for memory safety checks, reducing false positives and improving debugging workflows for custom allocators. The work focused on compiler internals and memory safety, ensuring minimal API changes and clear documentation. By enhancing sanitizer configurability, the contribution improved reliability and robustness in ASan-enabled builds, supporting more accurate testing and streamlined development for the STL codebase.