Imagine effortlessly designing your dream 3D room by simply chatting with an AI. That's the promise of Chat2Layout, a groundbreaking new system that transforms how we approach interior design. Gone are the days of complex software or professional expertise. Now, you can simply describe your vision in natural language, and watch as an AI agent brings it to life in a virtual 3D space. This revolutionary technology combines the visual reasoning power of Multimodal Large Language Models (MLLMs) with an interactive feedback loop. This means you can give instructions like "Add a modern minimalist sofa," or "Move the coffee table closer to the window," and the AI agent will adjust the layout in real time. Chat2Layout goes beyond simply placing furniture. It understands complex instructions, considers spatial relationships, and even refines object orientations to ensure your virtual room is both stylish and functional. The secret sauce lies in a clever visual prompting mechanism that helps the MLLM reason about plausible layouts. Plus, a unique Offline-to-Online search (O2O-Search) efficiently provides relevant examples for the AI to learn from. This allows Chat2Layout to handle open-set furniture placement, meaning it's not limited to a fixed catalog of objects. Need an antique Chinese vase? Just ask, and the AI will generate it for you. While still in its early stages, Chat2Layout offers a glimpse into the future of interior design, where creating personalized 3D spaces is as easy as chatting with a friend. Challenges remain, like handling extremely cluttered spaces and ensuring consistent style across generated furniture. But with further advancements, this technology has the potential to democratize interior design, putting the power of creativity into everyone's hands.