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X-ray observations provide a powerful means of probing the vicinity of supermassive black holes (SMBHs) in active galactic nuclei (AGNs). In AGNs, a primary X-ray continuum is produced in a corona located near the SMBH and is subsequently reprocessed by surrounding structures, giving rise to a variety of diagnostic X-ray spectral features. High-resolution X-ray spectroscopy of these features with an X-ray microcalorimeter opens a new window on key topics in AGN research, including the structure of accretion disks, broad-line regions, and dusty tori; the physical properties of ionized absorbers and disk winds, including ultra-fast outflows (UFOs); and the connection between AGNs and their host galaxies. The X-Ray Imaging and Spectroscopy Mission (XRISM) was successfully launched on September 7, 2023. In orbit, the Resolve instrument achieves a high energy resolution of ~5 eV at 6 keV using the X-ray Mirror Assembly (XMA) and an X-ray microcalorimeter. In parallel, the Xtend instrument provides a wide field of view of 38' × 38' over the 0.4−12 keV energy range, employing the XMA and an X-ray CCD camera. In this presentation, I will give an overview of the XRISM mission, summarize recent AGN results obtained from XRISM observations, and discuss future prospects for AGN studies enabled by high-precision X-ray spectroscopy.