As AI adoption accelerates, transitioning AI applications from prototypes to production requires careful consideration of tools, frameworks, and best practices across a tech stack consisting of inference, observability, and testing layers. Each layer plays a crucial role in ensuring the reliability, scalability, and monitoring of AI systems, with inference managing model execution, observability offering insights into performance and costs, and testing providing systematic evaluation of AI components. Helicone is highlighted for its observability solutions, while AI agent frameworks such as CrewAI, AutoGen, and LangChain are noted for enabling the development of autonomous systems. Integration protocols like the Model Context Protocol (MCP) simplify connecting AI models with external tools, enhancing their capabilities. Best practices emphasize prompt engineering, comprehensive testing, and robust security measures to protect AI applications and manage expenses. The text also suggests a hybrid approach to development, balancing the use of existing solutions with custom-built components, and identifies emerging trends such as interoperability standards and local model execution to maintain competitiveness.