Worked on strengthening the Redis RESP protocol handling in the redis/redis repository, focusing on correcting a critical CRLF formatting index error in the addReplyBulk function when replying with integer-encoded strings. Addressed this protocol bug by precisely adjusting buffer management in C, ensuring correct placement of CRLF characters for proper protocol framing. Supplemented the fix with comprehensive unit tests written in Tcl and C, validating bulk reply behavior across various integer and string encodings to prevent future regressions. This work improved protocol robustness and client compatibility, demonstrating careful attention to detail and a methodical approach to high-risk protocol implementation and testing.