In this work, we introduce metallicious (Figure ; Approach 3), a tool designed to streamline the parametrization of metal centers using the covalent metal model based on a template library. Similar to MCPB.py, it enables the parametrization of new templates using Seminario's method and RESP charges but with increased efficiency and applicability to systems with repetitive metal units, including supramolecular cages, MOFs and knots.