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一篇文章讲清楚 AI Agent 的核心概念:从 Token、Skill、RAG 到 MCP、SDD 和 Harness 工程

一篇文章讲清楚 AI Agent 的核心概念:从 Token、Skill、RAG 到 MCP、SDD 和 Harness 工程

1、Agent

Agent是以 LLM 为核心,具备规划(Planning)、记忆(Memory)和工具调用(Tool Use)能力,能够自主拆解复杂任务、循环执行、感知反馈并持续推进任务直到完成的计算实体,实现从“文本生成”到“任务自主执行”,不再只是被动响应指令,而是能像人类员工一样,自主实现任务闭环。

2、大模型预训练

预训练是在海量通用数据上训练模型,让它先学会语言规律、通用知识和基础能力,训练出一个可以复用的基座模型,训练方式是自监督学习,对大语言模型来说,最常见的做法就是不断预测下一个token。

3、大模型微调

微调是在这个预训练生成的基座模型之上,用更小规模、更贴近任务的数据继续训练,让模型更适合某个具体场景,训练方式通常是监督微调或者指令微调

4、大模型幻觉

幻觉就是大模型生成看似合理但实际是错误的回答,它会把虚假的信息当做事实来回答,所以我们不要认为大模型的回答就一定是正确的。

5、MCP协议

MCP(Model Context Protocol)是模型上下文协议,目的是为AI应用提供一个标准化接口,使其能够连接外部数据源和工具。例如,AI应用可以通过MCP连接到本地文件或数据库、搜索引擎或计算器、工作流或专业提示词等,从而获取到上下文信息并执行实际任务,可以把 MCP 理解为 AI 应用的"TypeC 接口"。

6、Token

Token中文翻译为词元,对于大模型来说,因为它只能处理数字,所以要找到一种方式把原始输入的文本转换为数字,这个就是分词器(tokenizer)所做的任务。分词器会按照分词算法把输入文本切分为多个token,然后用一个数字ID来表示token,后续大模型推理过程中都是使用这个数字ID来进行计算。

7、RAG-检索增强生成

Retrieval-Augmented Generation:RAG全称检索增强生成,就是让大模型在回答问题前先去“查资料”(检索),相当于让它开卷考试:模型本身可能没学过公司的内部文档,但只要把相关内容找出来给它,它就能结合这些资料给出靠谱的答案(生成)。

8、记忆模块

Agent的记忆通常拆成两层:第一层是短期记忆,用于当前会话,用截断对话或者总结摘要的方式去控制prompt长度,同时需要保持语义连贯。第二层是长期记忆,用于跨会话场景,用向量召回最相关的历史信息,再按需放回上下文。

9、Skill

Skill本质是结构化的本地文件夹,用来补充某个领域的流程、知识和工具,让模型在相关场景下自动或按需调用,是面向大模型的能力封装,由主说明文件skill.md、规则/流程文档、模板/示例、脚本/工具文件、参考资料等内容组成。

10、ReAct

ReAct就是Reason(推理)和Act(行动),它在做任务的时候,会先判断当前的信息够不够完成任务,如果不够,就去调用工具、执行某个动作,等结果回来之后,再继续推理下一步该怎么做,直到把任务走完。

11、Agent的自我反思

Agent 的反思机制,本质上是“生成后再评估,然后根据反馈修正结果”。常见有两类:自我反馈和外部反馈,自我反馈靠大模型自己审查输出,适合查文案一致性、约束遵循、有没有误改内容;外部反馈是把结果放进真实工具里验证,适合代码、计算、JSON、图表这类必须拿事实说话的任务。

12、Harness工程

Harness Engineering,中文是翻译为驾驭工程,是给 AI Agent 设计工作环境的一套工程方法,包括上下文管理、工具调用、沙箱环境、权限控制、测试验证、日志观测、评审机制和反馈回路,目的是为了让Agent在真实工程系统中更可靠、更可控,并持续完成任务。

13、SDD-规格驱动开发

Spec-Driven Development,中文叫规格驱动开发,是在正式编码之前,先把需求变更的目标、范围、系统行为、设计约束和任务拆分通过文档(规格文档)确定下来,再让AI按照这些文档去开发,能够把模糊需求变成稳定的工程上下文,从而减少AI自己猜需求、误改历史逻辑和实现跑偏的问题。
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我是 AgentGuide,大厂在职资深开发,后端转 AI Agent 开发。
持续分享 Agent / 大模型应用的优质面试题和答案解析。
如果你也在准备 AI 应用开发、大模型工程相关面试,可以继续关注后续系列。
推荐阅读:
字节面试官:别再直接让 AI写代码了,去学习一下 SDD 规格驱动开发
面试官问:什么是 Harness 工程?可以这样回答
面试官问:Agent 怎么评测?别再只答“看准确率”了
字节面试官:不用看复杂公式,能把大模型训练原理讲清楚吗?一文通俗易懂讲清大模型训练原理
字节面试官:大模型预训练和微调的区别是什么?
字节面试官:你的Agent系统里面Skill是怎么编写的?如何保证高质量的Skill?
字节面试官:Agent的记忆系统是什么?短期和长期记忆方案怎么设计?
字节面试官:混合专家模式(MOA)是什么?为什么MOA能够提升效果?
字节面试官:Token到底是什么?有哪些分词算法?一篇文章讲清!
字节面试官:RAG系统怎么进行效果调优?一文讲清评价指标到优化方式!
字节面试官:如何评估RAG系统?你项目有哪些测评指标?
字节面试官:ReAct的工作原理是什么?
面试官:什么是Multi-Agent,有哪些工作模式?
面试官:Skills是什么?讲一讲它的工作原理
面试官:什么是RAG?为什么大模型要先“查资料”,再回答问题?
面试官:你项目里面的提示词工程是怎么做的?
字节面试官:你是怎么理解MCP协议的?
面试官:Agent的本质是什么?一文讲透!
大厂Agent开发工程师亲测:从入门到胜任高级岗,核心技术学习路线
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  1. CONNECT:[ UseTime:0.000574s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000878s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000315s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000496s ]
  8. SELECT * FROM `article` WHERE `id` = 639964 LIMIT 1 [ RunTime:0.002906s ]
  9. UPDATE `article` SET `lasttime` = 1783092603 WHERE `id` = 639964 [ RunTime:0.007375s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 639964 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000480s ]
  12. SELECT * FROM `article` WHERE `id` > 639964 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000402s ]
  13. SELECT * FROM `article` WHERE `id` < 639964 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004780s ]
  14. SELECT * FROM `article` WHERE `id` < 639964 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001098s ]
  15. SELECT * FROM `article` WHERE `id` < 639964 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011835s ]
0.109888s