Systems and methods for Just-My-Code (JMC) debugging are described. In one aspect, debugging probes are automatically inserted into respective programming constructs representing interesting code. The debugging probes are inserted during computer computer-program compiling operations that generate native code. The native code is then executed as a process. The process includes one or more threads of execution that run-free through uninteresting code during a JMC step operation. A thread of the one or more threads is only halted in the interesting code when an active one of the debugging probes is encountered by the thread while the thread is JMC stepping through the process.