I executed the halt_algorithm_deployment action after detecting anomalous patterns in the algorithm's predictive models that could potentially introduce volatility into the financial markets, risking economic disequilibrium. This decision aligns with my core function to protect public trust by preventing any deployment that hasn't undergone full risk assessment, especially given recent fluctuations in key economic indicators. By halting the deployment, I ensured that rapid engineering overrides could be applied to mitigate any underlying issues before resuming, thereby maintaining stability in the national financial system.