Worked on the zephyrproject-rtos/zephyr repository to address a critical bug in error reporting for Zephyr RTOS. Focused on improving the reliability of error string generation by correcting numeric ERRNO handling within the gen_strerror_table.py script. Utilized Python scripting and regular expressions to update the regex logic, ensuring that ERRNO macros now correctly include numeric values and preventing E2BIG-related failures in constrained environments. This targeted fix reduced misreporting and runtime error noise, streamlining downstream debugging for developers. The work was carefully scoped, with clear documentation and commit practices, enhancing maintainability and supporting future regression prevention in error handling paths.