Large language model (LLM) agents have moved from research demos to production systems that automate intricate workflows. Unlike single-turn chatbots, agents combine reasoning, tool usage, and memory to accomplish goals that require multiple steps and conditional branching.
A core pattern is the perceive-reason-act loop. The agent observes the environment (via tool outputs or user input), reasons about the next action using the LLM, and then executes that action. State management is critical: without a structured way to store intermediate results, agents lose context and fail on longer horizons.
Effective agent architectures often separate planning from execution. A planner model breaks a goal into subtasks, while an executor handles each step, calling external APIs or databases. This separation improves reliability and makes debugging easier, as each subtask can be traced and evaluated independently.
When building agents, always implement guardrails: constrain tool schemas, validate outputs, and provide fallback paths. With these practices, developers can deploy agents that handle real business processes without constant human supervision.