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A basic idea of the concept is in this blog post: http://gilesbowkett.blogspot.com/2008/03/simple-metaprogramming-logger-with.html Maybe only work with jRuby (so you can hook the right places). The idea is to integrate into the IDE the ability to debug the dynamic nature of Ruby. So if a method has been added into a class/object at runtime (possibly using eval) then the debugger is able to show the added code and allow debugging of it, but also show where, when and how the code was added (which may have happened a long time before the debugging session hit it). This should track mixins etc.. so when you step into a mixin you can find out when and how that mixin was mixed in.