algorithmic penalties will be detected by the density tool, and others. I'm sure if theres problems the tools will find it. best part is it automatically emails the bad links to get them to remove them.
@Dragon I used linkaudit a few months back and they found 200 toxic links, I used their link removal tool that got rid of most of the links causing the penalty.
3 weeks later I did a reconsideration request and was successful.