ReAct

In Part 3: Qdrant Hybrid Search - Solving Semantic and Hard Filters, we successfully built a powerful Hybrid search engine combining Dense Semantic and Sparse Lexical Search. However, a practical e-commerce search system goes far beyond merely retrieving static documents from a vector database. For example, a user asks: “I want to buy a 400L Samsung Inverter refrigerator available at the District 1 branch that has an active promotion.” If we rely solely on a Vector Database, we face two critical errors: ...

1. The Decline of Static RAG In the previous 5 parts, we built a perfect RAG machine: real-time data (CDC), absolute security, and strict authorization. But no matter how perfect, traditional RAG suffers from a fatal flaw: It only knows how to “Read” and “Speak”, not how to “Do”. If you ask a RAG system: “Check if the server is overloaded, and if so, automatically boot up 2 more servers”, it will be completely powerless. RAG is a Static Pipeline running on a one-way street. ...

Answer-first: Generative UI architectures leverage Model Context Protocol (MCP) to stream dynamic UI component schemas from LLMs. Securing these interfaces requires validating inputs via Zod prop schemas at the API gateway and rendering only pre-compiled, versioned local primitive React components in the browser, eliminating the risk of arbitrary remote code execution. What You’ll Learn That AI Won’t Tell You Security controls for dynamic TSX execution in edge isolates. State reconciliation techniques between AI reasoners and client-side DOM states. The first generation of AI-powered chat interfaces followed a simple pattern: the user types a message, the LLM generates text, the UI renders text. The second generation added tool calls — the LLM could invoke functions and render the results as text. The third generation — Generative UI — goes further: the LLM generates not just text responses but interactive UI components that are rendered directly in the browser, enabling experiences that feel less like chatting with a text box and more like using a responsive, intelligent application. ...