In terms of uncertainty, a standard deviation between 0.4-0.6 eV (Fig. ) for the energy barriers is obtained with GAME-Net-UQ for Co. The greater uncertainty in the activation energy, compared to values for intermediate or transition state structures, arises from the propagation of uncertainty (i.e., standard deviation σ) when deriving reaction properties from species, which involves performing addition and subtraction operations on normal distributions. The smallest uncertainty is obtained for C-C coupling events, with a minimum standard deviation of 0.4 eV, while hydrogenation reactions show an uniform uncertainty distribution around 0.6 eV. Similar trends are observed for the other metals (Supplementary Fig. ).