Beyond Vector Search: What RAG Actually Needs | Yohan Lasorsa | Azure Cosmos DB Conf 2026

Microsoft Developer · Intermediate ·🔍 RAG & Vector Search ·5d ago
Skills: RAG Basics90%
Your AI agent is confidently serving wrong answers — and you don't even know it. Vector search is everyone's default for RAG, but ask for something specific and it quietly returns nonsense. Yohan Lasorsa (Principal Developer Advocate, Microsoft) takes a working AI agent with MCP and a real database, and extends it with agentic RAG using Azure Cosmos DB hybrid search — vector plus full-text — so it actually retrieves what matters. You'll learn why the default approach breaks, how to fix it, and how to let the agent decide when to search instead of doing it blindly every time. Live code, live demo, patterns you can steal. 👤 Connect with Yohan Lasorsa 📝 Yohan is a passionate software craftsman and open-source enthusiast who finds the web to be the ultimate playground. With expertise in full-stack engineering and a love for DIY projects, he enjoys exploring the boundaries of JavaScript and sharing his knowledge with others. As a Google Developer Expert (GDE) for Angular, Yohan is an accomplished international speaker and trainer, and an active maintainer and contributor to various open-source projects. 💼 https://www.linkedin.com/in/yohanlasorsa 𝕏 https://x.com/sinedied 🎤 https://developer.azurecosmosdb.com/conf/#speaker/yohan-lasorsa --- Azure Cosmos DB Conf 2026 is a free virtual developer event focused on building modern, scalable applications with Azure Cosmos DB. Sessions feature Microsoft engineers, product teams, and members of the global developer community sharing real-world solutions and best practices. Originally streamed on April 28, 2026 | 9:00 AM – 2:00 PM PT 🔗 Useful Links • Explore all sessions on-demand — https://aka.ms/CosmosConf26Playlist • Take the Cosmos Conf Challenge. First 500 to complete gets a voucher for 100% free certificate exam for DP-420 — https://aka.ms/CosmosDBConfChallenge • Azure DB Cosmos Conference 2026 Post-Event Survey — https://aka.ms/CosmosConf2026Survey • Visit the conference website — https://aka.ms/azurecosmosdbc
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