Developed Matter CO alarm state support within the binary_sensor component of the Home Assistant Core repository, enabling enhanced detection and automation for carbon monoxide events in smart home environments. The work focused on integrating Matter protocol capabilities using Python, ensuring that new CO-state actions could be triggered for supported IoT devices without disrupting existing user workflows. Emphasis was placed on maintaining backward compatibility and system stability throughout the implementation and collaborative review process. This feature extended the safety monitoring functionality of Home Assistant, leveraging skills in home automation, IoT development, and testing to deliver robust, protocol-compliant automation for CO detection.