Ego Automation MCP Server

Ego Automation MCP Server

MCP server that launches and manages ego-browser sessions, providing tools to open URLs and extract DOM records filtered by status, all through a sandboxed UI app.

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README

Ego Automation MCP App Demo

这是一个可运行的 MCP Apps demo:MCP App 是控制台 UI;MCP server 是唯一能启动 ego-browser nodejs、复用 task space/tab 并调用页面 bundle 的执行边界。

流程原理

sequenceDiagram
    participant Host as MCP Apps Host
    participant App as sandbox MCP App
    participant MCP as HTTP MCP Server
    participant Ego as ego-browser nodejs
    participant Page as 目标页面

    Host->>MCP: 连接 /mcp,列出 tools/resources
    MCP-->>Host: ego_open_session、ego_find_records、ui:// resource
    Host->>MCP: 读取 ui://ego-automation/console.html
    MCP-->>Host: mcp-app.html
    Host->>App: 在 sandbox iframe 渲染 AppBridge
    App->>MCP: tools/call ego_open_session(url)
    MCP->>Ego: spawn ego-browser nodejs
    Ego->>Ego: 创建 task space/tab
    Ego->>Ego: Page.addScriptToEvaluateOnNewDocument
    Ego->>Page: 导航到目标 URL
    Page-->>Ego: 页面加载并暴露 __egoSkill.ready
    Ego-->>MCP: session.id + tab/task 元数据
    MCP-->>App: 结构化会话结果
    App->>MCP: tools/call ego_find_records(sessionId, status)
    MCP->>Ego: 切回保存的 task space/tab
    Ego->>Page: 仅调用白名单 findRecords(args)
    Page-->>Ego: data-status 过滤结果
    Ego-->>MCP: JSON 结果
    MCP-->>App: count、records

具体链路如下:

  1. Host 连接 http://127.0.0.1:3001/mcp,发现两个工具和 ui://ego-automation/console.html App resource。
  2. Host 把 resource 放进 sandbox iframe;App 只能通过 app.callServerTool() 发起 MCP 工具调用,不能直接启动本地进程、读本地目录或控制 Ego。
  3. 点击“打开 ego 会话”后,MCP server 调用 EgoGateway.openSession()。Gateway 启动 ego-browser nodejs,创建隔离 task space,注册 Page.addScriptToEvaluateOnNewDocument 预加载受控 bundle,再导航到输入的 URL。
  4. Gateway 保存 session.id、task space 和 tab 标识。后续查询必须携带这个 session.id,因此查询会复用同一浏览器页面,而不是新开页面。
  5. 点击“查询 pending records”后,server 只允许执行声明的 findRecords 操作。页面 bundle 读取带有 data-status 的 DOM 元素,按 status: "pending" 过滤并返回 JSON。
  6. MCP server 将结果同时放入 structuredContent 和文本 envelope,App 解包后渲染到结果面板。

本地演示页面是 http://127.0.0.1:3001/pending-records.html,其中有两条 pending 记录和一条 done 记录;默认输入框已指向该页面。

Run

cd /Users/kongweixian/ai/demo/ego-automation-mcp-app-demo
npm install
npm run build
npm start
  • MCP endpoint: http://127.0.0.1:3001/mcp
  • HTTP bundle: http://127.0.0.1:3001/bundles/ego-skill-api.js
  • Pending records fixture: http://127.0.0.1:3001/pending-records.html
  • Local end-to-end fixture: http://127.0.0.1:3001/fixture.html

用支持 MCP Apps 的 Host 调用 ego_open_session 会渲染控制台。App 内的按钮调用 ego_find_records;服务端只允许调用 bundle 的 findRecords,不会接受任意 JavaScript、shell 命令或文件路径。

Local stdio entry

node stdio.mjs 通过 stdio 提供同一组 MCP tools 和 App resource。它会为 Ego 页面预加载单独启动一个自动分配端口的 127.0.0.1 bundle 静态服务器;该入口不会发布 MCP HTTP endpoint。

Codex MCP Apps Companion

Codex 当前把 MCP tools 提供给对话,但不原生渲染 MCP Apps resource。此项目提供独立的同源 Web host:http://127.0.0.1:3001/codex-host.html。它在 sandbox iframe 中加载 ui:// resource,并以 MCP Apps AppBridge 把 App 的调用转发给同一个 MCP server;它不是 Codex 对话 UI 的替代品。

HTTPS target pages

Gateway 启动时读取受控的 bundles/ego-skill-api.js,并把源码直接放进 Page.addScriptToEvaluateOnNewDocument 预加载脚本。因此 HTTPS 目标不会依赖从页面加载本地 HTTP bundle,也不会触发 mixed-content;返回的 bundleUrl 仍用于展示和外部部署场景。

如果把 bundle 改为远程加载,请把构建产物放到受控 HTTPS origin,并设置:

PUBLIC_BASE_URL=https://mcp.example.com \\
EGO_BUNDLE_URL=https://assets.example.com/ego-skill-api.v0.1.0.js \\
npm start

bundle 必须使用版本化的受控 URL,不能使用不受信任或可变的 latest.js

Boundaries

mcp-app.html 是 sandbox iframe 中的 UI,不能读写本机目录或启动 ego。文件系统、process 和 ego 操作都留在 server.mjs / lib/ego-gateway.mjs;App 只经 app.callServerTool() 调用语义化 MCP 工具。

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