AI agents, which perform tasks autonomously by leveraging large language models (LLMs), are used in various domains such as customer support, market research, and software development. They typically consist of a core language model and modules for planning, action, memory, and behavior profiling. AI agent observability is crucial for monitoring performance, behavior, and interactions to ensure efficiency and accuracy, with tools like Langfuse providing insights into metrics like latency and cost. This allows developers to debug and optimize AI systems, addressing issues such as intermediate errors and edge cases. Langfuse integrates with several frameworks, including LangGraph, Llama Agents, OpenAI Agents SDK, and Hugging Face smolagents, to facilitate the building and monitoring of complex, stateful, multi-agent applications. Additionally, no-code builders like Flowise, Langflow, and Dify enable easy creation and monitoring of LLM applications for non-developers, offering a range of capabilities for optimizing AI agent performance and user interaction.