Our ultimate goal is to move past comparisons to existing force fields and to develop new force fields which hopefully provide improved accuracy. While SMARTY and SMIRKY are both promising examples of tools which sample over chemical perception trees, our work here used them in the context of existing force fields. Longer-term, they will instead be used to help sample over chemical perception as well as force field parameters, since our real goal is to improve force fields. New scoring functions will be used to evaluate SMIRKS patterns and parameters in the SMIRNOFF format compared to experimental and/or quantum chemical reference data. These tools will allow the development of next generation force fields in a completely automated way.