Agent Builder is a browser-based tool that enables users to create, test, and deploy fully functional voice agents on LiveKit Cloud swiftly and without local setup. It offers a straightforward process where users start with a clear system prompt, leveraging LiveKit's built-in voice pipeline features like noise cancellation and multilingual detection. The tool allows for quick iteration with autosaving and version history, and it supports the integration of HTTP tools for dynamic data retrieval and processing during conversations. Users can test their agents live in the browser and deploy them with a single click, with the option to access and download the underlying code for further customization. Agent Builder is designed to be a starting point that facilitates the transition to more complex SDK implementations, supported by comprehensive documentation and AI-guided assistance. Future enhancements aim to include client tool support, real-time API integration, cost estimation, and a streamlined export-to-GitHub workflow, ensuring scalability and sophistication for various user needs.