Replit Agent is an AI-powered full-stack application builder integrated into the Replit cloud IDE. Powered by Agent 3, it turns natural language prompts into complete, deployable applications with minimal supervision. The platform features extended autonomous builds where the agent can plan, code, test, and debug entire projects end-to-end. Agent 3 includes App Testing for self-validation, where it periodically tests the application using a browser, generates reports, and automatically fixes issues it finds. It offers two build modes: Fast mode for quick prototypes and Full mode for production-quality applications. A standout feature is Agents & Automations, which lets users build their own autonomous agents and workflows using natural language to automate complex and repetitive tasks. Replit Agent explains its reasoning as it generates code, helping developers understand implementation choices rather than blindly accepting suggestions. The platform supports real-time collaboration, instant deployment, and hosting of live applications. Enterprise features include team management, centralized billing, and usage-based credit pooling. Replit has rapidly gained popularity as a go-to platform for both beginners building their first app and experienced developers rapidly prototyping ideas.