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What is MCP, and what is it useful for?

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6 source posts · 4 creatorsLast updated Nov 1
Short answerMCP is a unified interface standard for AI to connect with external tools and data. As long as AI applications follow the same set of rules, they can connect to external services like GitHub and databases in similar ways and directly call their functions within a conversation. For example, when Serena is connected to Codex, it can locate code by function and reference without repeatedly reading entire files; when Blender is connected, it can be used with it to make 3D games. Note that the more tools you install, the greater the context burden, so loading only what the current project needs is enough.

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    MCP can be understood as a unified socket standard for AI to connect to external tools and data, specifying how AI applications plug into external services such as GitHub and databases.

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    Once MCP is connected, agents can directly call tool functions within a conversation. For example, the REA MCP service can be registered to multiple agents with a single command: npx rea-agents setup.

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    Adding Serena MCP to Codex lets it pinpoint code by function, class, and reference without re-reading entire files, and the author says this noticeably reduces token consumption.

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    There is also an MCP for Blender. Someone hooked it up to Codex, used concept art as a reference, and reportedly made a 3D game in 45 minutes.

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    More MCPs isn't always better. The more tools like browsers, Figma, and GitHub you have, the greater the context burden, so load only what the current project needs.

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    The MCP protocol itself is still being updated. The latest version switches to stateless request-response, where each request is independent, and servers can be deployed like ordinary HTTP services.

What people on X saySorted by usefulness

01爱丽丝呀！08-12ZHExplaining the Division of Labor Among Agent, MCP, and Skill with a Company Analogy#1Codex、Claude 用了这么久，还分不清 Agent、MCP 和 Skill？ 别背那些复杂定义。 把 AI 想象成一家公司，Agent、MCP、Skill 一下就全懂了。 今天直接用大白话告诉你它们到底是干嘛的。MCPImageOriginal post164KLikes 414
02宝玉10-10ZHMCP Is the Universal Interface for Agents to Call External Tools, Using REA as an Example#2REA：让 AI 智能体帮你逆向没有源码的软件 开源项目 REA（Reverse Engineer Anything）把逆向分析工具接到了 Claude Code、Codex、Cursor 这类 AI 编程智能体上。MCPImageOriginal post135KLikes 711
03govin.eth10-20ZHConnecting Serena MCP to Codex to Pinpoint Code Precisely#3真逆天！Codex 6.1 接入 Serena，token 消耗直接降低 90% 昨天让 AI 改个 Bug，动不动就把整个文件读一遍。项目越大，代码没改多少，Token 先烧了一堆MCPImageOriginal post68KLikes 581
04Tz09-05ZHHow to Use Blender MCP with Codex to Make a 3D Game逆天。。。 GPT-6 Astra 做 3D 游戏简直强到离谱了。。。 有人摸索出了用 Astra 做出炸裂视觉效果 3D 游戏的方法，MCPImageOriginal post94KLikes 891
05govin.eth08-19ZHInstalling Too Many MCPs Eats Up Context, So Load Them as the Project RequiresCodex 5.6 这 4 个设置，能砍掉 80% 无效 token 浪费，复杂长任务效率还能提升 70% 很多时候不是模型不够强，而是你的上下文、缓存和工具配置正在拖后腿。 1️⃣ 尽量吃满 prompt cacheMCPImageOriginal post215KLikes 484
06宝玉07-29ZHNew MCP Version Goes Stateless, Making Deployment More Like a Regular WebsiteMCP 协议今天推出了第五个大版本（版本号 2026-07-28），核心变化：从有状态双向协议变成了无状态的请求/响应协议。 这是 MCP 社区呼声最高的改动。MCPImageOriginal post123KLikes 477
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