Just read the "Overview" and "Prerequisites" sections and then try the "Live Demo". You may have to install a CORS Unblocker to give the agent access to documents it found during a web search (modern browser security make web applications difficult...)
About
AI agents are "cool" these days and can be found at many places - but for most of us, they are basically just "black boxes" which do not reveal how they work internally. Blockly is a visual programming environment developed by Google that allows users to create code using drag-and-drop "Lego"-like blocks. It is designed to simplify coding by abstracting away the syntax, making it accessible for beginners and educational purposes. By combining these two technologies, the "blockly-ai-playground" offers beginners and casual programmers an easy way to play and experiment with their own AI agents!