Sets up and reports atomistic calculations so they are reproducible and converged, covering ASE Atoms, calculators, optimizers and MD drivers, pymatgen structures, symmetry analysis and the Materials Project API, LAMMPS and GROMACS input basics for molecular dynamics, convergence tests for k-points, plane-wave cutoffs and timesteps, the unit system each code uses, energy-minimization stopping criteria, and archiving of exact input files. Use for DFT, classical or machine-learned potential simulations of molecules, crystals, surfaces and liquids; use molecular-dynamics for biomolecular trajectory analysis and pymatgen for detailed library usage.