During June 2025, Riley contributed to the sandialabs/pyGSTi repository by addressing a critical bug in the idle gate dimension calculation within optools.py. Riley identified that the idle gate was previously constructed with an incorrect dimension, which could lead to leakage and inaccurate simulation results. By applying expertise in linear algebra and numerical computing, Riley modified the code to ensure the idle gate is now created with the system’s dimension squared, aligning with the theoretical requirements of quantum gate simulations. This Python-based fix improved the reliability of downstream simulation and calibration workflows, demonstrating careful attention to mathematical correctness and code quality.