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The James Webb Space Telescope (JWST) has recently uncovered the presence oflow-luminosity active galactic nuclei (AGNs) at $z=4-11$. Spectroscopicobservations have provided estimates of the nuclear black hole (BH) masses forthese sources, extending the low-mass boundary down to $M_{\rm BH} \sim10^{6-7}~M_\odot$. Despite this breakthrough, the observed lowest mass of BHsis still $\gtrsim 1-2$ orders of magnitude heavier than the predicted massrange of their seed population, thereby leaving the initial mass distributionof massive BHs poorly constrained. In this paper, we focus on UV-to-optical (inrest frame) flares of stellar tidal disruption events (TDEs) embedded inlow-luminosity AGNs as a tool to explore low-mass BH populations with $\lesssim10^{4-6}~M_\odot$. We provide an estimate of the TDE rate over $z=4-11$associated wth the properties of JWST-detected AGN host galaxies, and find thatdeep and wide survey programs with JWST and Roman Space Telescope (RST) candetect and identify TDEs up to $z\simeq 4-7$. The predicted detection numbersof TDEs at $z>4$ in one year are $N_{\rm TDE} \sim 2-10~(0.2-2)$ for theJADES-Medium (and COSMOS-Web) survey with JWST, and $N_{\rm TDE} \sim2-10~(8-50)$ for the Deep (and Wide) tier of the High-latitude Time DomainSurvey with RST. We further discuss the survey strategies to hunt for thetransient high-redshift TDEs in wide-field surveys with RST, as well as a jointobservation campaign with the Vera C. Rubin Observatory for enhancing thedetection number. The high-redshift TDE search will give us a uniqueopportunity to probe the mass distribution of early BH populations.

Exploring Low-Mass Black Holes through Tidal Disruption Events in the Early Universe: Perspectives in the Era of JWST, RST, and LSST Surveys