Worked on the yhyang201/sglang repository to enhance the reliability of the sampling pipeline by addressing a critical bug in the SamplingParams validation logic. Introduced a defensive check in Python to ensure that a repetition_penalty value of zero is rejected, thereby preventing potential runtime errors during sampling operations. Collaborated closely with another contributor to implement and review the fix, emphasizing robust backend development practices. Focused on improving code safety and maintainability through targeted unit testing and validation enhancements. The work prioritized stability in the sampling process, reducing the risk of downstream failures and contributing to a more resilient backend system.