  Active galactic nucleus (AGN) disks are widely considered potential hosts for
various high-energy transients, including gamma-ray bursts (GRBs). The
reactivation of GRB central engines can provide additional energy to shocks
formed during the interaction of the initially ejected GRB jets with the
circumburst material, commonly referred to as energy injections. In this paper,
we study GRBs occurring in AGN disks within the context of energy injections.
We adopt the standard external forward shock (EFS) model and consider both
short- and long-duration GRB scenarios. Light curves for two types of
radiation, namely the radiation from the heated disk material (RHDM) and GRB
afterglows, are computed. We find that the energy injection facilitates the EFS
to break out from the photosphere of the low-density AGN disk at relativistic
velocity. Moreover, the energy injection almost does not affect the RHDM but
significantly enhances the peak flux of the GRB afterglows.
