Chem. Commun., 2025, Accepted Manuscript DOI: 10.1039/D5CC04384K, Communication Xiang He, Chuan Xiong, Mingjun Wang, Shayu Li A machine learning-designed "supramolecular armor" imparts exceptional stability to perovskite quantum dots. A guanidinium crosslinker reinforces a β-cyclodextrin layer, creating a robust yet permeable interface that enables direct contact sensing...