Code Mode MCP Server

Code Mode MCP Server

Executes TypeScript code in a secure sandbox with IPC-bridged access to MCP tools like filesystem operations and network requests.

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README

MCP Code Mode Server

基于 MCP 的"代码即工具"实现:在安全沙箱中执行 TypeScript 代码,通过 IPC 桥接调用 MCP servers。

测试覆盖率: 99.41% 语句 · 100% 行 · 100% 函数


快速开始

# 1. 安装依赖
npm install

# 2. 生成 TypeScript API
npm run generate-api

# 3. 构建项目
npm run build

# 4. 本地测试
node test-mcp-simple.mjs

# 5. 运行测试套件
npm test

配置 Claude Desktop

配置文件位置

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: %APPDATA%\Claude\claude_desktop_config.json
  • Linux: ~/.config/Claude/claude_desktop_config.json

配置内容

{
  "mcpServers": {
    "code-mode": {
      "command": "node",
      "args": [
        "/绝对路径/mcp-code-mode-demo/dist/server.js"
      ],
      "description": "Execute TypeScript in sandbox with MCP tools"
    }
  }
}

注意: 替换为实际项目的绝对路径。

配置完成后,重启 Claude Desktop 即可使用。


使用示例

读取文件

import * as fs from "./servers/filesystem/index.js";

const content = await fs.readFile({ path: "package.json" });
const pkg = JSON.parse(content);
console.log("项目:", pkg.name);

写入文件

import * as fs from "./servers/filesystem/index.js";

await fs.writeFile({
  path: "output.txt",
  content: "Hello from Code Mode!"
});

列出目录

import * as fs from "./servers/filesystem/index.js";

const files = await fs.listDirectory({ path: "." });
console.log("当前目录文件:", files);

网络请求

import * as fetch from "./servers/fetch/index.js";

const response = await fetch.fetch({
  url: "https://api.github.com/repos/anthropics/claude-code"
});
const data = JSON.parse(response);
console.log("Stars:", data.stargazers_count);

工作原理

Claude Desktop ↔ MCP Server (本项目)
          │  execute_code 工具
          ▼
   主进程 ─── fork ───▶ 子进程(执行用户 TS)
     ▲                      │
     │      process.send    │  import './servers/...'
     └────── IPC ───────────┘
     │
MCP Servers (filesystem、fetch 等)
  • 子进程通过 IPC 向主进程发送 MCP 工具调用请求
  • 主进程代理执行并返回结果
  • 支持跨平台:macOS / Linux / Windows

项目结构

src/
├── generator.ts        # MCP → TypeScript API 生成器
├── simple-sandbox.ts   # 沙箱执行器(Node.js fork + IPC)
└── server.ts           # MCP Server 入口

generated-api/
├── client.ts           # IPC 客户端
└── servers/            # MCP server API 封装

测试

# 运行测试
npm test

# 查看覆盖率
npm run test:coverage

覆盖率:99.41% 语句、100% 行、100% 函数


核心特性

  • IPC 桥接: 子进程安全调用主进程 MCP 工具
  • 模块解析: 符号链接或目录拷贝(自动降级)
  • 跨平台: macOS / Linux / Windows 完整支持
  • 高测试覆盖率: 36 个测试用例,覆盖核心路径
  • 生产就绪: 隔离执行、资源清理、超时控制

故障排查

Server 无法启动

  1. 检查是否已构建:npm run build
  2. 检查 dist/server.js 是否存在
  3. 确认 Node.js 版本 >= 18

代码执行失败

  1. 确保已生成 API:npm run generate-api
  2. 检查 generated-api/servers/ 目录是否存在
  3. 验证导入路径:./servers/...

Claude Desktop 看不到工具

  1. 检查配置文件路径是否正确
  2. 确保使用绝对路径
  3. 重启 Claude Desktop
  4. 查看开发者工具控制台日志

安全建议

  • 代码在子进程中隔离执行
  • filesystem 工具默认限制访问范围
  • 生产环境建议配置资源限制(CPU/内存)
  • 可选:容器级/系统级额外隔离

License

MIT

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