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AI AGENT是如何构成的|核心组件|标准架构|AGENT系列

AI AGENT是如何构成的|核心组件|标准架构|AGENT系列
内容摘要
    AI Agent可以看成以推理和规划驱动的状态机,通过结构化协议调用工具,在闭环中不断逼近目标的“带控制面的分布式系统”,本篇从系统设计和Agent Engineering视角,结合可用于生产设计的标准模型,对Agent的内部用另外的角度去分拆理解
本篇内容包括
1.AI Agent 工程化标准架构

2.核心组件1:推理引擎(Reasoning Engine)

3.核心组件2:工具系统(Tool Integration)

4.核心组件3:状态与记忆(State & Memory)

5.核心组件4:规划系统(Planning System)

6.核心组件 5:结构化输出(Structured Output)

7.工程闭环&生产建议

#AI#AGENT#组件#系统设计#工程#推理#工具#记忆#规划#结构化输出

1.AI Agent工程化标准架构

标准的工程化架构图中

  • Agent系统 = 

    • 决策系统(推理) + 控制流程(编排) + 状态机(内存/状态) + 执行系统(工具) + 接口协议(结构化输出)

  • 从“控制系统论”视角

    • 架构本质

      • 闭环控制系统(Closed-loop Control System)

状态_t

推理(状态_t,目标)
动作_t
工具执行
观察_t
状态_{t+1} = 更新(状态_t, 观察_t)
    • 工程对应关系

控制系统概念
Agent组件
控制器
推理引擎
执行器
工具层
状态
存储器/状态
反馈
观察
控制信号
结构化输出
  • 架构简析

    • 推理(Reasoning) ≠ LLM

      • 生产系统中,推理引擎就是,LLM + 提示模板 + 工具架构 + 路由逻辑 + Guardrails
        • 否则系统不可控
    • 编排(Orchestration)才是“真正的大脑”
      • 很多人误以为LLM是核心,其实真正控制执行流程的是Orchestration层
        • 循环执行(ReAct Loop)
        • 状态更新
        • 工具调度
        • 重试/回退
    • Agent本质是“状态机”(State Machine)
      • 形式化Agent = (S, A, T, R)
        • S: States(状态)
        • A: Actions(动作)
        • T: Transition function(过渡函数)
        • R: Reward/Objective(目标)
    • 规划(Planning)是“优化器”,不是必须但强烈建议
      • 没有Planning:策略 = 贪心(Greedy)
      •    有Planning:策略 = 全局最优近似(Global Optimization)
    • 结构化输出(Structured Output) = “协议层”(最容易被低估)
      • 类比
        • Agent System = 应用层
        • Structured Output = HTTP / RPC
      • 没有它
        • 系统不可编排
        • tool不可执行
        • 无法做自动化
  • AI Agent是一个以LLM为决策核心的、基于状态机的闭环控制系统,通过结构化协议驱动工具执行,并由编排层管理多步推理与任务完成

2.核心组件1:推理引擎(Reasoning Engine)

    • 本质是Agent的决策控制器(Decision Controller),不是单纯“生成文本”

      • 负责:Input → 解析 → 推理 → 决策 → 下一步动作

  • 技术实现形态
    • ReAct Loop(主流)
      • Thought → Action → Observation → Thought → ...
      • 带反馈的闭环控制系统(Closed-loop Control System)
    • 更高级形态(生产常见)
      • Tool-aware Reasoning
      • Cost-aware Reasoning
        • token成本
        • latency
        • 成功率
          • 动态选择策略
    • 隐含关键点(很多人忽略)
      • Prompt ≠ Reasoning
        • 真正生产中
          • Reasoning Engine = Prompt + Policy + Router + Guardrails
            • 包括
              • system prompt(行为约束)
              • routing logic(选模型/选工具)
              • fallback策略
    • 常见错误
      • 把LLM当Agent
      • 没有控制循环(一次性调用)
      • 无状态推理(每步重来)

3.核心组件2:工具系统(Tool Integration)

    • 本质工具 = Agent的“执行器(Actuator)”

      • 让Agent从“会说” → “会做”
  • 工具分类
    • 1)数据类工具
      • DB(SQL/Vector)
      • Search(RAG)
      • API(外部系统)
    • 2)执行类工具
      • Python/Code Interpreter
      • Workflow API(如审批、工单)
      • Automation(RPA)
    • 3)环境类工具
      • 文件系统
      • Memory store
      • Cache
  • Tool调用的标准模式
    • 生产系统不会让模型“自由输出文本”,而是
    {
      "tool": "query_db",
      "args": {...}
    }
      • 是Structured Output的基础
  • 工程核心难点
    • 工具选择问题
      • 多工具时如何选择
      • 如何避免错误调用
      • 解决
        • function schema
        • tool embedding routing
        • few-shot tool usage
    • 工具可靠性
      • timeout
      • retry
      • fallback

4.核心组件3:状态与记忆(State & Memory)

    • 本质:是Agent的“上下文存储+工作记忆+历史记忆”

  • 分层模型

    • 1)短期记忆(Working Memory)

      • 类似CPU cache
        • 当前对话
        • 当前步骤结果
        • scratchpad
      • ReAct的Thought/Observation就在这里
    • 2)中期状态(Execution State)
      • 类似workflow state
        • task_list
        • current_step
        • partial_result
    • 3)长期记忆(Long-term Memory)
      • 向量库(RAG)
      • 用户历史
      • 知识库
  • 数据结构(建议)
    state = {
      "messages": [],
      "plan": [],
      "tool_results": [],
      "variables": {},
      "memory_refs": []
    }
  • 关键问题
    • 上下文爆炸
      • token超限
      • 成本爆炸
    • 解决
      • token-aware修剪
      • memory压缩
      • 检索过滤

5.核心组件 4:规划系统(Planning System)

  • 本质:Planning = 把问题变成可执行DAG/Task Graph

    • 规划层级

      • Simple TODO

        • 搜索数据
        • 分析
        • 输出
      • Tree/DAG Planning(高级)
Goal
/    \
Task1   Task2
|
Subtask
      • 动态规划(生产级)
      • 结合
        • 状态
        • 工具结果
        • 失败反馈
    • 与Reasoning 的关系
模块
作用
Reasoning
决策下一步
Planning
定义整体路径
      • 关系
        • Planning = 全局策略
        • Reasoning = 局部决策
    • 没有Planning
      • Agent会“乱试”
      • 成本高
      • 不稳定
    • 有Planning
      • 降低token消耗
      • 提高成功率
      • 可解释

6.核心组件 5:结构化输出(Structured Output)

    • 本质:Agent→ 系统的通信协议(Protocol)

      • LLM 默认输出:自然语言(不可靠)
      • 生产系统需要:机器可解析(Deterministic)
  • 常见结构
    • 1)Tool Call
    {
      "action": "call_tool",
      "tool": "search",
      "args": {...}
    }
    • 2)Plan Update
    {
      "task_id": 2,
      "status": "completed"
    }
    • 3)Final Answer
    {
      "result": "...",
      "confidence": 0.92
    }
  • 实现方式
    • JSON schema(强约束)
    • function calling(OpenAI/Claude)
    • Pydantic parser
    • grammar-based decoding(更高级)
  • 核心价值
问题
解决
幻觉
schema约束
不可执行
强类型
工具误调用
参数校验

7.工程闭环&生产建议

  • 5大组件的形成“闭环系统”

用户输入【推理引擎】【规划系统】(可选触发)
【结构化输出】【工具执行层】【观察结果】【状态更新】
回到推理(循环)
    • 本质:一个带状态的循环执行引擎(Stateful Execution Loop)
  • 工程建议
 - 生产中必须补充的点
    • Orchestration Layer(编排层)
      • 如:LangGraph/CrewAI/OpenAI Agents SDK
      • 负责
        • 管理循环
        • 状态流转
        • tool调用
    • Guardrails(安全与约束)
      • 输出校验
      • 敏感信息过滤
      • tool权限控制
    • Observability(可观测性)
      • success rate
      • tool error rate
      • token cost
      • latency
    • Multi-Agent(扩展)
      • 多个Agent
        • Planner Agent
        • Executor Agent
        • Reviewer Agent
#AI#AGENT#组件#系统设计#工程#推理#工具#记忆#规划#结构化输出

部分往期参考

➔ LLM系列 链接

➔ AGENT系列 链接

➔ TRANSFORMER系列 链接

➔ PROMPT系列 链接

➔ MoE系列 链接

➔ RAG系列 链接

更多内容,记得关注"AIPM之泡泡糖"...

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  1. CONNECT:[ UseTime:0.001227s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001550s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008944s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007838s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001985s ]
  6. SELECT * FROM `set` [ RunTime:0.000733s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001916s ]
  8. SELECT * FROM `article` WHERE `id` = 508938 LIMIT 1 [ RunTime:0.014163s ]
  9. UPDATE `article` SET `lasttime` = 1775793216 WHERE `id` = 508938 [ RunTime:0.046212s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.005216s ]
  11. SELECT * FROM `article` WHERE `id` < 508938 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005092s ]
  12. SELECT * FROM `article` WHERE `id` > 508938 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001344s ]
  13. SELECT * FROM `article` WHERE `id` < 508938 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004868s ]
  14. SELECT * FROM `article` WHERE `id` < 508938 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008369s ]
  15. SELECT * FROM `article` WHERE `id` < 508938 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002117s ]
0.287587s