AI agent routing is becoming increasingly important as AI systems scale, functioning like intelligent traffic controllers to direct data and requests to appropriate processing agents using parameters such as input type, user intent, and contextual information. Various techniques have emerged to enhance routing precision, including rule-based logic, intent classification, semantic matching, multi-objective optimization, context-aware, and hierarchical approaches. Best practices for effective AI agent routing emphasize modularity, semantic precision, fallback strategies, security, compliance, testing, and feedback loops. Next-generation routing tools, like LangChain, Semantic Kernel, and Haystack, are advancing the field by focusing on flexibility, context understanding, and seamless decision-making, paving the way for more adaptive and autonomous AI applications. However, challenges such as managing complexity, latency trade-offs, model drift, and interoperability remain, highlighting the need for intelligent and flexible routing strategies to handle real-world applications effectively.