AI Agent 是一种智能系统，它使用 AI 模型（通常是大型语言模型，如 GPT-4 或 Llama）来感知环境、进行推理、规划行动，并执行任务，以实现用户设定的目标。简单来说，它就像一个“智能助手”，不只是回答问题，还能主动做事。总之，AI Agent 让 AI 从“说”变成“做”，开启了更实用的应用。
🤖 What Is an AI Agent?
An AI Agent is an AI system that can understand instructions, reason about what to do, take actions using tools, and interact with its environment to achieve a goal. Unlike a simple chatbot that only replies with text, an AI Agent can decide, plan, and act.
🧠 Core Idea (One Sentence)
An AI Agent = a “thinking brain” (LLM) + “doing hands” (tools) working together to complete tasks.
🔑 Key Characteristics of an AI Agent
An AI Agent can:
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Understand instructions
It reads and interprets natural language from users.
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Reason and plan
It breaks a goal into steps and decides what to do next.
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Use tools and act
It can call tools such as web search, APIs, databases, or software.
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Interact with the environment
It observes results, adapts, and continues until the goal is reached.
⚙️ How an AI Agent Works (Simple Flow)
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Receive a goal
“Find tomorrow’s weather in NYC.”
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Plan steps
Search weather → read forecast → format result.
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Take actions
Use tools like web search or APIs.
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Return results
Provide the final answer to the user.
📦 What Makes an AI Agent Different from an LLM?
| LLM (Chatbot) | AI Agent |
|---|---|
| Generates text | Makes decisions |
| Responds once | Acts over multiple steps |
| No tools | Uses tools |
| Passive | Goal-driven |
