An AI agent router serves as the decision-making layer that manages how user requests are routed to the correct function, service, or action within a system. This component is particularly important in large-scale conversational systems where multiple intents, services, and actions are involved. Routers help ensure efficiency, scalability, and accuracy by routing requests that determine which function, service, or action should be executed. Implementing an agent router can be valuable in systems with multiple service integrations, diverse user input handling, modular design patterns, and sophisticated error handling mechanisms. Agents benefit from routers when they have complex or non-deterministic capabilities. Routers use techniques such as function calling, intent-based routing, and pure code routing to handle their core routing function. The choice of implementation approach should be guided by factors like system complexity requirements, scalability needs, performance constraints, and maintenance considerations. Function calling with LLMs is a flexible but potentially resource-intensive option, while intent-based routing provides clear structural separation and straightforward debugging capabilities. Pure code routing offers superior performance and complete control over routing logic but may limit flexibility and require significant rework for system modifications. Best practices for agent router implementation include scope management, developing clear guidelines, and implementing robust monitoring solutions to track router performance and system behavior.