A stable environment is critical for preserving product quality in industries such as pharmaceuticals and perishable goods logistics. While current RFID-based sensors enable wireless monitoring of temperature and moisture, they lack the ability to record threshold violations without continuous reader power or battery-supported logging. This paper presents AntSense, a battery-free RFID sensor that leverages stimuli-responsive structures to physically record environment violation events during the transit even when there is no reader available. When exposed to temperature or moisture beyond thresholds, memory alloy or solvable materials undergo irreversible geometric deformation, altering the integrated antenna’s characteristics. These changes remain detectable via standard RFID readers even after environment conditions normalize, enabling verification of transit integrity. Our prototype evaluations demonstrate reliable detection of threshold violations in real-world scenarios. By combining passive operation with persistent event recording, AntSense offers a scalable solution for supply chain monitoring without compromising the maintenance-free advantages of RFID technology.