Developed thread-safe formatting system enhancements for the zeek/zeek repository, focusing on improving backend reliability under concurrent workloads. Migrated formatting operations from a single process-global buffer to per-thread formatting, isolating backend threads and eliminating data-race risks. Strengthened error handling by replacing non-reentrant strerror calls with a thread-safe alternative, and introduced defensive programming measures such as DEBUG-only assertions to prevent improper cross-thread usage. Expanded documentation to clarify correct usage patterns and safeguard against misuse. Utilized C++ with an emphasis on multithreading, thread safety, and debugging, resulting in more robust backend formatting and reduced risk of corrupted outputs during high-load scenarios.