Explore the critical decision-making process between function calling and agents in AWS AI applications through this 20-minute conference talk from AWS re:Invent 2025. Discover the fundamental differences between these two approaches and learn how to evaluate which method best suits your specific use case requirements. Examine real-world scenarios where function calling excels for simple data integrations versus situations where agents provide superior orchestration for dynamic, multi-step workflows. Gain insights into architectural considerations that influence your choice between these AI implementation strategies. Delve into the emerging landscape of multi-agent systems and understand how they enable scalable intelligent automation across complex enterprise environments. Master the art of matching your AI solution's complexity with the appropriate AWS tools and methodologies to optimize performance and maintainability.