Summary Replit hosted a livestream build session showing how to create a private bookmark manager with a Chrome extension from scratch using Replit Agent in under two hours. The team demonstrated how to write effective prompts, troubleshoot issues, and add AI-powered features like content summarization using OpenAI integration with minimal manual coding. Building the initial functional app and extension cost around five dollars using Replit Agent, with additional costs for feature iterations and enhancements throughout the session.