AI agent frameworks, designed to simplify the development of autonomous systems, often introduce complexities through abstractions and unpredictable behaviors, making their real-world application challenging. This article reviews nine AI agent frameworks across three complexity levels, offering developers options from visual no-code tools like Flowise, Botpress, and Langflow, which prioritize accessibility and ease of use, to intermediate low-code solutions like n8n and CrewAI, which balance visual design with customization capabilities. Programming-first frameworks such as AutoGen, LangGraph, and SmolAgents cater to developers seeking maximum control and flexibility. Among these, n8n stands out for its hybrid approach, integrating AI capabilities with traditional workflow automation, making it ideal for creating scalable, production-ready AI systems that can trigger traditional workflows. The article emphasizes evaluating factors such as project complexity, developer expertise, language preferences, and integration needs to select the appropriate framework, highlighting n8n's unique balance of visual development, robust integrations, and enterprise-level scalability as a key advantage for businesses.