With the rapid expansion of smart homes and Internet of Things (IoT) applications, end-users increasingly require intuitive tools to develop and manage automation programs. Although Home Assistant, one of the most popular open-source smart home platforms, enables flexible automation through YAML-based configuration, text-based programming remains challenging and error-prone for non-expert users. To address this limitation, we extend our previous Smart Block system—a visual programming language originally designed for the SmartThings platform—to support Home Assistant automations. The proposed Smart Block for Home Assistant provides a Blockly-based environment that allows users to visually compose automation rules, automatically generate corresponding YAML code, and reverse existing YAML automations back into visual block representations. Furthermore, we propose an inter-automation conflict analysis method that detects redundancy, inconsistency, and circularity among multiple automations, ensuring program correctness even when heterogeneous automation scripts coexist. This paper presents a progress report on our ongoing study toward building a reliable, visual, and interoperable automation development environment for smart homes.