What's the noun for debug? Here's the word you're looking for.
debuggability
(uncountable) The quality of being debuggable; capability of being (easily) debugged.
(countable) The extent to which something can be debugged.
debugger
(programming) A computer program that helps the user to test and debug other programs, by enabling their step-by-step execution controlled by the user, setting of breakpoints, and monitoring values of variables.