Motivating seven-year-olds to complete their daily reading and handwriting practice is a classic parenting challenge. Traditional rewards work for a while, but they lack interactivity and require constant manual verification. As a developer, I like to solve such challenges with automation. After putting some thought into it, I came up with the Sweets Vault idea: an interactive agent powered by Google's Agent Development Kit (ADK) and the Gemini API . The system acts as a cheerful guardian that talks to children, visually inspects their workbooks via uploaded images, tests their reading comprehension, and triggers a hardware lock to open a drawer full of sweets upon successful completion. In this guide, I will walk you through the architecture and implementation of this solution. You will learn how to: Structure a multimodal agent using the Agent Development Kit (ADK). Implement visual and verbal verification using Gemini's multimodal capabilities. Manage state across multiple conversation turns and tools.…