chore(version): bump version to 1.4.0

feat(website): drop hash route; upgrade styling

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -9,7 +9,7 @@ body:
         Thanks for your interest in improving the project! Before submitting, please read our guidelines.
         感谢您对改进项目的兴趣！提交前请阅读我们的指南。
 
-        - [Code of Conduct](https://github.com/alibaba/page-agent/blob/main/CODE_OF_CONDUCT.md)
+        - [Code of Conduct](https://github.com/alibaba/page-agent/blob/main/docs/CODE_OF_CONDUCT.md)
         - [Contributing Guide](https://github.com/alibaba/page-agent/blob/main/CONTRIBUTING.md)
 
   - type: textarea
@@ -58,4 +58,4 @@ body:
         - label: I have read the Code of Conduct. / 我已阅读行为准则。
           required: true
     validations:
-      required: true
+      required: true

.github/ISSUE_TEMPLATE/config.yml

@@ -10,5 +10,5 @@ contact_links:
     url: https://github.com/alibaba/page-agent/blob/main/CONTRIBUTING.md
     about: How to contribute code and ideas. 如何进行贡献与提交代码。
   - name: Code of Conduct / 行为准则
-    url: https://github.com/alibaba/page-agent/blob/main/CODE_OF_CONDUCT.md
+    url: https://github.com/alibaba/page-agent/blob/main/docs/CODE_OF_CONDUCT.md
     about: Community expectations and standards. 社区行为期望与标准。

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -9,7 +9,7 @@ body:
         Thanks for your interest in improving the project! Before submitting, please read our guidelines.
         感谢您对改进项目的兴趣！提交前请阅读我们的指南。
 
-        - [Code of Conduct](https://github.com/alibaba/page-agent/blob/main/CODE_OF_CONDUCT.md)
+        - [Code of Conduct](https://github.com/alibaba/page-agent/blob/main/docs/CODE_OF_CONDUCT.md)
         - [Contributing Guide](https://github.com/alibaba/page-agent/blob/main/CONTRIBUTING.md)
 
   - type: textarea
@@ -44,4 +44,4 @@ body:
         - label: I have read the CODE_OF_CONDUCT.md and CONTRIBUTING.md. / 我已阅读行为准则。
           required: true
     validations:
-      required: true
+      required: true

.github/PULL_REQUEST_TEMPLATE.md

@@ -22,4 +22,4 @@ Closes #(issue)
 
 ## Requirements / 要求
 
-- [ ] I have read and follow the [Code of Conduct](CODE_OF_CONDUCT.md) and [Contributing Guide](CONTRIBUTING.md) . / 我已阅读并遵守行为准则。
+- [ ] I have read and follow the [Code of Conduct](../docs/CODE_OF_CONDUCT.md) and [Contributing Guide](../CONTRIBUTING.md) . / 我已阅读并遵守行为准则。

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [20, 24, 25]
+        node-version: [24]
 
     steps:
       - uses: actions/checkout@v6

.github/workflows/release.yml

@@ -6,7 +6,7 @@ on:
       - 'v*'
 
 permissions:
-  id-token: write  # Required for OIDC
+  id-token: write # Required for OIDC
   contents: read
 
 jobs:
@@ -24,7 +24,7 @@ jobs:
       # Ensure npm 11.5.1 or later is installed
       - name: Update npm
         run: npm install -g npm@latest
-        
+
       - name: Install dependencies
         run: npm ci
 
@@ -32,4 +32,12 @@ jobs:
         run: npm run build:libs
 
       - name: Publish all public packages
-        run: npm publish --workspaces --access public
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/v}
+          if [[ "$VERSION" == *"-"* ]]; then
+            # Prerelease version (e.g., 0.3.0-beta.1) -> extract tag name before the dot
+            TAG=$(echo "$VERSION" | sed 's/.*-\([a-zA-Z]*\).*/\1/')
+            npm publish --workspaces --access public --tag "$TAG"
+          else
+            npm publish --workspaces --access public
+          fi

.gitignore

@@ -25,11 +25,17 @@ dist-ssr
 *.sw?
 .qoder
 
-
-# 
+# env files
 .env
+.env.*
 
-# Copied files for npm publish (generated by prepublishOnly)
-packages/page-agent/README.md
-packages/page-agent/README-zh.md
-packages/page-agent/LICENSE
+# extension
+.output
+.wxt
+
+# AI
+.agent
+.claude
+.cursor
+.gemini
+CLAUDE.md

.vscode/extensions.json

@@ -1,3 +1,3 @@
 {
-	"recommendations": ["dbaeumer.vscode-eslint", "prettier.prettier-vscode"]
+    "recommendations": ["dbaeumer.vscode-eslint", "esbenp.prettier-vscode"]
 }

.vscode/settings.json

@@ -1,29 +1,38 @@
 {
-	"editor.fontLigatures": true,
-	"cSpell.words": [
-		"deepseek",
-		"HITL",
-		"innerhtml",
-		"llms",
-		"onwarn",
-		"opensource",
-		"qwen",
-		"retryable",
-		"shadcn",
-		"wouter"
-	],
-	"markdownlint.config": {
-		// "comment": "Relaxed rules",
-		"default": true,
-		"whitespace": false,
-		"line_length": false,
-		"ul-indent": false,
-		"no-inline-html": false,
-		"no-bare-urls": false,
-		"fenced-code-language": false,
-		"first-line-h1": false,
-		"block-spacing": false,
-		"blanks-around-lists": false,
-		"ol-prefix": false
-	}
+    "cSpell.words": [
+        "deepseek",
+        "historychange",
+        "HITL",
+        "innerhtml",
+        "languagedetector",
+        "llms",
+        "magicui",
+        "npmmirror",
+        "onwarn",
+        "opensource",
+        "qwen",
+        "retryable",
+        "shadcn",
+        "sidepanel",
+        "statuschange",
+        "wouter"
+    ],
+    "files.exclude": {
+        "packages/*/node_modules": true
+    },
+    "markdownlint.config": {
+        // "comment": "Relaxed rules",
+        "default": true,
+        "whitespace": false,
+        "line_length": false,
+        "ul-indent": false,
+        "no-inline-html": false,
+        "no-bare-urls": false,
+        "fenced-code-language": false,
+        "first-line-h1": false,
+        "block-spacing": false,
+        "blanks-around-lists": false,
+        "ol-prefix": false,
+        "no-duplicate-heading": false
+    }
 }

AGENTS.md

@@ -4,12 +4,13 @@
 
 This is a **monorepo** with npm workspaces:
 
-- **Core Library** (`packages/page-agent/`) - AI agent for browser DOM automation, published as `page-agent` on npm
+- **Page Agent** (`packages/page-agent/`) - Main entry with built-in UI Panel, published as `page-agent` on npm
+- **Extension** (`packages/extension/`) - Browser extension (WXT + React) 🚧 WIP
 - **Website** (`packages/website/`) - React docs and landing page. **When working on website, follow `packages/website/AGENTS.md`**
 
 Internal packages:
 
-- **CDN** (`packages/cdn/`) - IIFE builds for script tag usage (npm: `@page-agent/cdn`)
+- **Core** (`packages/core/`) - PageAgentCore without UI (npm: `@page-agent/core`)
 - **LLMs** (`packages/llms/`) - LLM client with reflection-before-action mental model
 - **Page Controller** (`packages/page-controller/`) - DOM operations and visual feedback (SimulatorMask), independent of LLM
 - **UI** (`packages/ui/`) - Panel and i18n. Decoupled from PageAgent
@@ -21,6 +22,7 @@ npm start                    # Start website dev server
 npm run build                # Build all packages
 npm run build:libs           # Build all libraries
 npm run lint                 # ESLint with TypeScript strict rules
+npm run zip -w @page-agent/ext # Zip the extension package
 ```
 
 ## Architecture
@@ -31,10 +33,11 @@ Simple monorepo solution: TypeScript references + Vite aliases. Update tsconfig
 
 ```
 packages/
-├── page-agent/              # npm: "page-agent" ⭐ MAIN
-├── cdn/                     # npm: "@page-agent/cdn" (IIFE builds)
+├── core/                    # npm: "@page-agent/core" ⭐ Core agent logic (headless)
+├── page-agent/              # npm: "page-agent" entry class (with UI + controller + demo builds)
 ├── website/                 # @page-agent/website (private)
 ├── llms/                    # @page-agent/llms
+├── extension/               # Browser extension (WXT + React)
 ├── page-controller/         # @page-agent/page-controller
 └── ui/                      # @page-agent/ui
 ```
@@ -43,9 +46,10 @@ packages/
 
 ### Module Boundaries
 
-- **Page Agent**: Core lib. Imports from `@page-agent/llms`, `@page-agent/page-controller`, `@page-agent/ui`
+- **Page Agent**: Main entry with UI. Extends PageAgentCore and adds Panel. Imports from `@page-agent/core`, `@page-agent/ui`
+- **Core**: PageAgentCore without UI. Imports from `@page-agent/llms`, `@page-agent/page-controller`
 - **LLMs**: LLM client with MacroToolInput contract. No dependency on page-agent
-- **UI**: Panel and i18n. No dependency on page-agent
+- **UI**: Panel and i18n. Decoupled from PageAgent via PanelAgentAdapter interface
 - **Page Controller**: DOM operations with optional visual feedback (SimulatorMask). No LLM dependency. Enable mask via `enableMask: true` config
 
 ### PageController ↔ PageAgent Communication
@@ -71,34 +75,31 @@ const pageInfo = await this.pageController.getPageInfo()
 3. **LLM Processing**: AI returns action plans (page-agent)
 4. **Indexed Operations**: PageAgent calls PageController by element index
 
-### CDN Builds (`packages/cdn/`)
-
-Two IIFE builds for script tag usage:
-
-| Build | File                 | Description                      |
-| ----- | -------------------- | -------------------------------- |
-| Demo  | `page-agent.demo.js` | Auto-init with built-in test API |
-| Full  | `page-agent.js`      | Exposes `PageAgent` class only   |
-
-Demo build supports query params (e.g., `?model=gpt-4&lang=en-US`).
-
 ## Key Files Reference
 
 ### Page Agent (`packages/page-agent/`)
 
-| File               | Description                             |
-| ------------------ | --------------------------------------- |
-| `src/PageAgent.ts` | ⭐ Main AI agent class                  |
-| `src/umd.ts`       | CDN/UMD entry with auto-init            |
-| `src/tools/`       | Tool definitions calling PageController |
+| File               | Description                                  |
+| ------------------ | -------------------------------------------- |
+| `src/PageAgent.ts` | ⭐ Main class with UI, extends PageAgentCore |
+| `src/demo.ts`      | IIFE demo entry (auto-init with demo API)    |
+
+### Core (`packages/core/`)
+
+| File                   | Description                             |
+| ---------------------- | --------------------------------------- |
+| `src/PageAgentCore.ts` | ⭐ Core agent class without UI          |
+| `src/tools/`           | Tool definitions calling PageController |
+| `src/config/`          | Configuration types and constants       |
+| `src/prompts/`         | System prompt templates                 |
 
 ### LLMs (`packages/llms/`)
 
-| File                         | Description                           |
-| ---------------------------- | ------------------------------------- |
-| `src/index.ts`               | ⭐ LLM class with retry logic         |
-| `src/types.ts`               | MacroToolInput, AgentBrain, LLMConfig |
-| `src/OpenAILenientClient.ts` | OpenAI-compatible client              |
+| File                  | Description                           |
+| --------------------- | ------------------------------------- |
+| `src/index.ts`        | ⭐ LLM class with retry logic         |
+| `src/types.ts`        | MacroToolInput, AgentBrain, LLMConfig |
+| `src/OpenAIClient.ts` | OpenAI-compatible client              |
 
 ### Page Controller (`packages/page-controller/`)
 
@@ -113,7 +114,7 @@ Demo build supports query params (e.g., `?model=gpt-4&lang=en-US`).
 
 ### New Agent Tool
 
-1. Implement in `packages/page-agent/src/tools/index.ts`
+1. Implement in `packages/core/src/tools/index.ts`
 2. If tool needs DOM ops, add method to PageController first
 3. Tool calls `this.pageController.methodName()` for DOM interactions
 
@@ -129,3 +130,5 @@ Demo build supports query params (e.g., `?model=gpt-4&lang=en-US`).
 - ESLint relaxes some unsafe rules for rapid iteration
 - Every change you make should not only implement the desired functionality but also improve the quality of the codebase
 - All code and comments must be in English.
+- Do not try to hide errors or risks. They are valuable feedbacks for developers and users. Make them visible and actionable.
+- Traceability and predictability is more important than success rate.

CLAUDE.md

@@ -1 +0,0 @@
-@AGENTS.md

CONTRIBUTING.md

@@ -7,23 +7,25 @@ Thank you for your interest in contributing to Page-Agent! We welcome contributi
 ### Development Setup
 
 1. **Prerequisites**
-   - `node.js >= 20` with `npm >= 10`
-   - An editor that supports `ts/eslint/prettier`
-   - Make sure `eslint`, `prettier` and `commitlint` work well
+    - `node.js >= 20` with `npm >= 10`
+    - An editor that supports `ts/eslint/prettier`
+    - Make sure `eslint`, `prettier` and `commitlint` work well
 
 2. **Setup**
 
-   ```bash
-   npm ci
-   npm start          # Start demo and documentation site
-   ```
+    ```bash
+    npm ci
+    npm start          # Start demo and documentation site
+    ```
 
 ### Project Structure
 
-This is a **monorepo** with npm workspaces containing **two main packages**:
+This is a **monorepo** with npm workspaces containing **4 main packages**:
 
-1. **Core Library** (`packages/page-agent/`) - Pure JavaScript/TypeScript AI agent library for browser DOM automation, published as `page-agent` on npm
-2. **Website** (`packages/website/`) - React documentation and landing page. Also as demo and test page for the core lib. private package `@page-agent/website`
+- **Page Agent** (`packages/page-agent/`) - Main entry with built-in UI Panel, published as `page-agent` on npm
+- **Core** (`packages/core/`) - Core agent logic without UI (npm: `@page-agent/core`)
+- **Extension** (`packages/extension/`) - Chrome extension for multi-page tasks and browser-level automation
+- **Website** (`packages/website/`) - React documentation and landing page. Also as demo and test page for the core lib. private package `@page-agent/website`
 
 We use a simplified monorepo solution with `native npm-workspace + ts reference + vite alias`. No fancy tooling. Hoisting is required.
 
@@ -44,39 +46,39 @@ We use a simplified monorepo solution with `native npm-workspace + ts reference
 
 1. **Fork and Clone**
 
-   ```bash
-   git clone https://github.com/your-username/page-agent.git
-   cd page-agent
-   ```
+    ```bash
+    git clone https://github.com/your-username/page-agent.git
+    cd page-agent
+    ```
 
 2. **Create Feature Branch**
 
-   ```bash
-   git checkout -b feat/your-feature-name
-   ```
+    ```bash
+    git checkout -b feat/your-feature-name
+    ```
 
 3. **Make Changes**
-   - Follow existing code style and patterns
-   - Add tests for new functionality
-   - Update documentation as needed
+    - Follow existing code style and patterns
+    - Add tests for new functionality
+    - Update documentation as needed
 
 4. **Test Your Changes**
-   - Test in our demo website
-   - Test it on other websites if applicable
-   - `@TODO: test suite`
+    - Test in our demo website
+    - Test it on other websites if applicable
+    - `@TODO: test suite`
 
 5. **Commit and Push**
 
-   ```bash
-   git add .
-   git commit -m "feat: add awesome feature"
-   git push origin feat/your-feature-name
-   ```
+    ```bash
+    git add .
+    git commit -m "feat: add awesome feature"
+    git push origin feat/your-feature-name
+    ```
 
 6. **Create Pull Request**
-   - Provide clear description of changes
-   - Link related issues
-   - Include screenshots for UI changes
+    - Provide clear description of changes
+    - Link related issues
+    - Include screenshots for UI changes
 
 ## 📝 Code Style
 
@@ -91,21 +93,49 @@ We use a simplified monorepo solution with `native npm-workspace + ts reference
 ### Vibe coding with AI
 
 - It's **recommended** to heavily rely on AI (aka "vibe coding") when maintaining **demo pages and tests**.
-- BUT **NOT the core lib!!!** Be very careful if AI ever touched the core lib!!!
+- Be very careful if AI ever touched the core lib!!!
 - Review anything AI wrote before make a commit. You are the author of anything you commit. NOT AI.
 - Update the [AI instructions](AGENTS.md) when structure changed.
 
+If your lame AI assistant does not support [AGENTS.md](https://agents.md/). Add an alias for it:
+
+- claude-code (`CLAUDE.md`)
+
+    ```markdown
+    @AGENTS.md
+    ```
+
+- antigravity (`.agent/rules/alias.md`)
+
+    ```markdown
+    ---
+    trigger: always_on
+    ---
+
+    @../../AGENTS.md
+    ```
+
 ## 🔧 Development Workflows
 
 ### Test With Your Own LLM API
 
 - Create a `.env` file in the repo root with your LLM API config
 
-  ```env
-  LLM_MODEL_NAME=gpt-5.2
-  LLM_API_KEY=your-api-key
-  LLM_BASE_URL=https://api.your-llm-provider.com/v1
-  ```
+    ```env
+    LLM_MODEL_NAME=gpt-5.2
+    LLM_API_KEY=your-api-key
+    LLM_BASE_URL=https://api.your-llm-provider.com/v1
+    ```
+
+- **Ollama example** (tested on 0.15 + qwen3:14b, RTX3090 24GB):
+
+    ```env
+    LLM_BASE_URL="http://localhost:11434/v1"
+    LLM_API_KEY="NA"
+    LLM_MODEL_NAME="qwen3:14b"
+    ```
+
+    > ⚠️ Add `*` to `OLLAMA_ORIGINS` (403). Models < 10B unlikely strong enough. Requires tool_call support. Set context length > 15k (default 4k will NOT work): `$env:OLLAMA_CONTEXT_LENGTH=64000; ollama serve`
 
 - Restart the dev server to load new env vars
 - If not provided, the demo will the free testing proxy by default
@@ -116,19 +146,29 @@ We use a simplified monorepo solution with `native npm-workspace + ts reference
 npm start
 ```
 
+### Extension Development
+
+```bash
+npm run dev -w @page-agent/ext
+npm run zip -w @page-agent/ext
+```
+
+- Load extension in Chrome via `chrome://extensions` -> **Load unpacked**
+- Use `packages/extension/docs/extension_api.md` (EN) or `packages/extension/docs/extension_api_zh.md` (ZH) for API integration details
+
 ### Testing on Other Websites
 
 - Start and serve a local `iife` script
 
-  ```bash
-  npm run dev:iife # Serving IIFE with auto rebuild at http://localhost:5174/page-agent.js
-  ```
+    ```bash
+    npm run dev:demo # Serving IIFE with auto rebuild at http://localhost:5174/page-agent.demo.js
+    ```
 
 - Add a new bookmark
 
-  ```javascript
-  javascript:(function(){var s=document.createElement('script');s.src=`http://localhost:5174/page-agent.js?t=${Math.random()}`;s.onload=()=>console.log(%27PageAgent ready!%27);document.head.appendChild(s);})();
-  ```
+    ```javascript
+    javascript:(function(){var s=document.createElement('script');s.src=`http://localhost:5174/page-agent.demo.js?t=${Math.random()}`;s.onload=()=>console.log(%27PageAgent ready!%27);document.head.appendChild(s);})();
+    ```
 
 - Click the bookmark on any page to load Page-Agent
 
@@ -164,14 +204,6 @@ By contributing to this project, you agree that your contributions will be licen
 
 > You may need to sign a github CLA before you create a PR.
 
-### Browser-Use Attribution
-
-Parts of this project are derived from the [browser-use](https://github.com/browser-use/browser-use) project (MIT License). When contributing to DOM-related functionality:
-
-- Maintain existing attribution comments
-- Follow similar patterns for consistency
-- Credit browser-use for derived concepts
-
 ## 💬 Questions?
 
 - Open a GitHub issue for technical questions

README-zh.md

@@ -1,146 +0,0 @@
-# PageAgent 🤖🪄
-
-![banner](https://img.alicdn.com/imgextra/i1/O1CN01RY0Wvh26ATVeDIX7v_!!6000000007621-0-tps-1672-512.jpg)
-
-[![npm version](https://badge.fury.io/js/page-agent.svg)](https://badge.fury.io/js/page-agent) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/) [![Downloads](https://img.shields.io/npm/dt/page-agent.svg)](https://www.npmjs.com/package/page-agent) [![Bundle Size](https://img.shields.io/bundlephobia/minzip/page-agent)](https://bundlephobia.com/package/page-agent) [![GitHub stars](https://img.shields.io/github/stars/alibaba/page-agent.svg)](https://github.com/alibaba/page-agent)
-
-纯 JS 实现的 GUI agent。使用自然语言操作你的 Web 应用。无须后端、客户端、浏览器插件。
-
-🌐 [English](./README.md) | **中文**
-
-👉 <a href="https://alibaba.github.io/page-agent/" target="_blank"><b>🚀 Demo</b></a> | <a href="https://alibaba.github.io/page-agent/#/docs/introduction/overview" target="_blank"><b>📖 Documentation</b></a>
-
-<video id="demo-video" src="https://github.com/user-attachments/assets/141bbb01-8022-4d1f-919d-9efc9a1dc1cf" width="640" crossorigin muted autoplay loop></video>
-
----
-
-## ✨ Features
-
-- **🎯 轻松集成**
-- **🔐 端侧运行**
-- **🧠 HTML 脱水**
-- **💬 自然语言接口**
-- **🎨 HITL 交互界面**
-
-## 🗺️ Roadmap
-
-👉 [**Roadmap**](https://github.com/alibaba/page-agent/issues/96)
-
-## 🚀 快速开始
-
-### 快速体验 (Demo CDN)
-
-最快的体验方式：
-
-```html
-<script src="https://registry.npmmirror.com/@page-agent/cdn/latest/files/dist/page-agent.demo.js" crossorigin="true"></script>
-```
-
-> ⚠️ **仅用于技术评估。** Demo 模型有速率限制和使用限制，生产环境请使用 NPM 方式。
-
-| 位置   | URL                                                                                     |
-| ------ | --------------------------------------------------------------------------------------- |
-| 全球   | https://cdn.jsdelivr.net/npm/@page-agent/cdn/dist/page-agent.demo.js                    |
-| 中国   | https://registry.npmmirror.com/@page-agent/cdn/latest/files/dist/page-agent.demo.js     |
-
-### NPM 安装（推荐）
-
-```bash
-npm install page-agent
-```
-
-```javascript
-import { PageAgent } from 'page-agent'
-
-const agent = new PageAgent({
-	model: 'deepseek-chat',
-	baseURL: 'https://api.deepseek.com',
-	apiKey: 'YOUR_API_KEY',
-	language: 'zh-CN',
-})
-
-await agent.execute('点击登录按钮')
-```
-
-### CDN 引入
-
-适用于无法使用 NPM 的环境，用法与 NPM 一致：
-
-```html
-<script src="https://registry.npmmirror.com/@page-agent/cdn/latest/files/dist/page-agent.js" crossorigin="true"></script>
-<script>
-const agent = new PageAgent({
-	model: 'deepseek-chat',
-	baseURL: 'https://api.deepseek.com',
-	apiKey: 'YOUR_API_KEY',
-})
-await agent.execute('点击登录按钮')
-</script>
-```
-
-| 位置   | URL                                                                                 |
-| ------ | ----------------------------------------------------------------------------------- |
-| 全球   | https://cdn.jsdelivr.net/npm/@page-agent/cdn/dist/page-agent.js                     |
-| 中国   | https://registry.npmmirror.com/@page-agent/cdn/latest/files/dist/page-agent.js      |
-
-## 🏗️ 架构设计
-
-PageAgent adopts a simplified monorepo structure:
-
-```
-packages/
-├── page-agent/          # AI agent (npm: page-agent)
-├── llms/                # LLM 客户端 (npm: @page-agent/llms)
-├── page-controller/     # DOM 操作 & 蒙层 & 模拟鼠标 (npm: @page-agent/page-controller)
-├── ui/                  # 面板 & i18n (npm: @page-agent/ui)
-├── cdn/                 # CDN IIFE builds (npm: @page-agent/cdn)
-└── website/             # 文档站点
-```
-
-## 🤝 贡献
-
-欢迎社区贡献！以下是参与方式：
-
-### 开发环境
-
-1. Fork 项目仓库
-2. Clone or fork: `git clone https://github.com/alibaba/page-agent.git && cd page-agent`
-3. 安装依赖: `npm install`
-4. 启动开发: `npm start`
-
-### 贡献指南
-
-请在贡献前阅读我们的[行为准则](CODE_OF_CONDUCT.md)和[贡献指南](CONTRIBUTING.md)。
-
-## 👏 致谢
-
-本项目基于以下优秀项目构建：
-
-- **[browser-use](https://github.com/browser-use/browser-use)**
-
-PageAgent 专为**客户端网页增强**设计，不是服务端自动化工具。
-
-## 📄 许可证
-
-MIT 许可证 - 详见 [LICENSE](LICENSE) 文件。
-
-```
-DOM processing components and prompt are derived from browser-use:
-
-Browser Use
-Copyright (c) 2024 Gregor Zunic
-Licensed under the MIT License
-
-Original browser-use project: <https://github.com/browser-use/browser-use>
-
-We gratefully acknowledge the browser-use project and its contributors for their
-excellent work on web automation and DOM interaction patterns that helped make
-this project possible.
-
-Third-party dependencies and their licenses can be found in the package.json
-file and in the node_modules directory after installation.
-```
-
----
-
-**⭐ 如果觉得 PageAgent 有用或有趣，请给项目点个星！**

README.md

@@ -1,49 +1,60 @@
-# PageAgent 🤖🪄
+# Page Agent
 
-![banner](https://img.alicdn.com/imgextra/i3/O1CN01MyVCS21EoKkIHUT1s_!!6000000000398-49-tps-1280-353.webp)
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="https://img.alicdn.com/imgextra/i4/O1CN01qKig1P1FnhpFKNdi6_!!6000000000532-2-tps-1280-256.png">
+  <img alt="Page Agent Banner" src="https://img.alicdn.com/imgextra/i1/O1CN01NCMKXj1Gn4tkFTsxf_!!6000000000666-2-tps-1280-256.png">
+</picture>
 
-[![npm version](https://badge.fury.io/js/page-agent.svg)](https://badge.fury.io/js/page-agent) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/) [![Downloads](https://img.shields.io/npm/dt/page-agent.svg)](https://www.npmjs.com/package/page-agent) [![Bundle Size](https://img.shields.io/bundlephobia/minzip/page-agent)](https://bundlephobia.com/package/page-agent) [![GitHub stars](https://img.shields.io/github/stars/alibaba/page-agent.svg)](https://github.com/alibaba/page-agent)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/) [![Downloads](https://img.shields.io/npm/dt/page-agent.svg)](https://www.npmjs.com/package/page-agent) [![Bundle Size](https://img.shields.io/bundlephobia/minzip/page-agent)](https://bundlephobia.com/package/page-agent) [![GitHub stars](https://img.shields.io/github/stars/alibaba/page-agent.svg)](https://github.com/alibaba/page-agent)
 
 The GUI Agent Living in Your Webpage. Control web interfaces with natural language.
 
-🌐 **English** | [中文](./README-zh.md)
+🌐 **English** | [中文](./docs/README-zh.md)
 
-👉 <a href="https://alibaba.github.io/page-agent/" target="_blank"><b>🚀 Demo</b></a> | <a href="https://alibaba.github.io/page-agent/#/docs/introduction/overview" target="_blank"><b>📖 Documentation</b></a>
+👉 <a href="https://alibaba.github.io/page-agent/" target="_blank"><b>🚀 Demo</b></a> | <a href="https://alibaba.github.io/page-agent/docs/introduction/overview" target="_blank"><b>📖 Documentation</b></a>
 
-<video id="demo-video" src="https://github.com/user-attachments/assets/de8d1964-8bde-494f-a52f-2975469557a5" width="640" crossorigin muted autoplay loop></video>
+<video id="demo-video" src="https://github.com/user-attachments/assets/11aed429-b69c-49d5-8982-fa99b4a0e9a8" controls crossorigin muted></video>
 
 ---
 
 ## ✨ Features
 
-- **🎯 Easy Integration** - Transform your webpage into an agent with a single script tag.
-- **🔐 Client-Side Processing**
-- **🧠 DOM Extraction**
-- **💬 Natural Language Interface**
-- **🎨 UI with Human in the loop**
+- **🎯 Easy integration**
+    - No need for `browser extension` / `python` / `headless browser`.
+    - Just in-page javascript. Everything happens in your web page.
+    - The best tool for your agent to control web pages.
+- **📖 Text-based DOM manipulation**
+    - No screenshots. No OCR or multi-modal LLMs needed.
+    - No special permissions required.
+- **🧠 Bring your own LLMs**
+- **🎨 Pretty UI with human-in-the-loop**
+- **🐙 Optional [chrome extension](https://alibaba.github.io/page-agent/docs/features/chrome-extension) for multi-page tasks.**
 
-## 🗺️ Roadmap
+## 💡 Use Cases
 
-👉 [**Roadmap**](https://github.com/alibaba/page-agent/issues/96)
+- **SaaS AI Copilot** — Ship an AI copilot in your product in lines of code. No backend rewrite needed.
+- **Smart Form Filling** — Turn 20-click workflows into one sentence. Perfect for ERP, CRM, and admin systems.
+- **Accessibility** — Make any web app accessible through natural language. Voice commands, screen readers, zero barrier.
+- **Multi-page Agent** — Extend your agent's reach across browser tabs with the optional [chrome extension](https://alibaba.github.io/page-agent/docs/features/chrome-extension).
 
 ## 🚀 Quick Start
 
-### Quick Try (Demo CDN)
+### One-line integration
 
-Fastest way to try PageAgent:
+Fastest way to try PageAgent with our free Demo LLM:
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/@page-agent/cdn/dist/page-agent.demo.js" crossorigin="true"></script>
+<script src="{URL}" crossorigin="true"></script>
 ```
 
-> ⚠️ **For technical evaluation only.** Demo model has rate limits and usage restrictions. Use NPM for production.
+| Mirrors | URL                                                                                |
+| ------- | ---------------------------------------------------------------------------------- |
+| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.4.0/dist/iife/page-agent.demo.js         |
+| China   | https://registry.npmmirror.com/page-agent/1.4.0/files/dist/iife/page-agent.demo.js |
 
-| Location | URL                                                                                     |
-| -------- | --------------------------------------------------------------------------------------- |
-| Global   | https://cdn.jsdelivr.net/npm/@page-agent/cdn/dist/page-agent.demo.js                    |
-| China    | https://registry.npmmirror.com/@page-agent/cdn/latest/files/dist/page-agent.demo.js     |
+> **⚠️ For technical evaluation only.** This demo CDN uses our free [testing LLM API](https://alibaba.github.io/page-agent/docs/features/models#free-testing-api). By using it, you agree to its [terms](https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md).
 
-### NPM Installation (Recommended)
+### NPM Installation
 
 ```bash
 npm install page-agent
@@ -53,76 +64,28 @@ npm install page-agent
 import { PageAgent } from 'page-agent'
 
 const agent = new PageAgent({
-	model: 'deepseek-chat',
-	baseURL: 'https://api.deepseek.com',
-	apiKey: 'YOUR_API_KEY',
-	language: 'en-US',
+    model: 'qwen3.5-plus',
+    baseURL: 'https://dashscope.aliyuncs.com/compatible-mode/v1',
+    apiKey: 'YOUR_API_KEY',
+    language: 'en-US',
 })
 
 await agent.execute('Click the login button')
 ```
 
-### CDN Build
-
-For environments where NPM is not available. Usage is identical to NPM:
-
-```html
-<script src="https://cdn.jsdelivr.net/npm/@page-agent/cdn/dist/page-agent.js" crossorigin="true"></script>
-<script>
-const agent = new PageAgent({
-	model: 'deepseek-chat',
-	baseURL: 'https://api.deepseek.com',
-	apiKey: 'YOUR_API_KEY',
-})
-await agent.execute('Click the login button')
-</script>
-```
-
-| Location | URL                                                                                 |
-| -------- | ----------------------------------------------------------------------------------- |
-| Global   | https://cdn.jsdelivr.net/npm/@page-agent/cdn/dist/page-agent.js                     |
-| China    | https://registry.npmmirror.com/@page-agent/cdn/latest/files/dist/page-agent.js      |
-
-## 🏗️ Structure
-
-PageAgent adopts a simplified monorepo structure:
-
-```
-packages/
-├── page-agent/          # AI agent (npm: page-agent)
-├── llms/                # LLM client (npm: @page-agent/llms)
-├── page-controller/     # DOM operations & Visual Mask (npm: @page-agent/page-controller)
-├── ui/                  # Panel & i18n (npm: @page-agent/ui)
-├── cdn/                 # CDN IIFE builds (npm: @page-agent/cdn)
-└── website/             # Demo & Documentation site
-```
+For more programmatic usage, see [📖 Documentations](https://alibaba.github.io/page-agent/docs/introduction/overview).
 
 ## 🤝 Contributing
 
-We welcome contributions from the community! Here's how to get started:
+We welcome contributions from the community! Follow our instructions in [CONTRIBUTING.md](CONTRIBUTING.md) for environment setup and local development.
 
-### Setup
-
-1. Fork the repository
-2. Clone your fork: `git clone https://github.com/alibaba/page-agent.git && cd page-agent`
-3. Install dependencies: `npm install`
-4. Start development: `npm start`
-
-### Contributing Guidelines
-
-Please read our [Code of Conduct](CODE_OF_CONDUCT.md) and [Contributing Guide](CONTRIBUTING.md) before contributing.
+Please read [Code of Conduct](docs/CODE_OF_CONDUCT.md) before contributing.
 
 ## 👏 Acknowledgments
 
-This project builds upon the excellent work of:
+This project builds upon the excellent work of **[`browser-use`](https://github.com/browser-use/browser-use)**.
 
-- **[browser-use](https://github.com/browser-use/browser-use)**
-
-PageAgent is designed for **client-side web enhancement**, not server-side automation.
-
-## 📄 License
-
-MIT License - see the [LICENSE](LICENSE) file for details.
+`PageAgent` is designed for **client-side web enhancement**, not server-side automation.
 
 ```
 DOM processing components and prompt are derived from browser-use:
@@ -141,6 +104,10 @@ Third-party dependencies and their licenses can be found in the package.json
 file and in the node_modules directory after installation.
 ```
 
+## 📄 License
+
+[MIT License](LICENSE)
+
 ---
 
 **⭐ Star this repo if you find PageAgent helpful!**

docs/CHANGELOG.md

@@ -0,0 +1,153 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.3.0] - 2026-02-13
+
+### Breaking Changes
+
+- **Lifecycle: `stop()` vs `dispose()`** - New `stop()` method to cancel the current task while keeping the agent reusable. `dispose()` is now terminal — a disposed agent cannot be reused. This affects both `PageAgentCore` and `PanelAgentAdapter`.
+
+### Features
+
+- **Panel action button** - The panel button now morphs between Stop (■) and Close (X) based on agent status
+- **Error history** - Errors and max-step failures are now recorded in `history` as `AgentErrorEvent`, making post-task analysis more complete
+
+### Bug Fixes
+
+- **AbortError handling** - `AbortError` is no longer retried by the LLM client, and shows a clean "Task stopped" message instead of a raw error stack
+
+---
+
+## [1.2.0] - 2026-02-11
+
+### Features
+
+- **Observe Phase** - Agent now observes the page before each action, improving decision accuracy on dynamic pages
+- **Better Abort Handling** - Improved `abortSignal` support for cleaner task cancellation
+
+### Improvements
+
+- Pruned system prompts for lower token usage and faster responses
+- Improved error handling during agent steps with better error messages
+- Zod tree-shaking for smaller bundle size
+
+### Bug Fixes
+
+- Fixed indentation lost in DOM extraction caused by `trimLines`
+- Fixed `gpt-5-mini` temperature configuration
+
+---
+
+## [1.1.0] - 2026-02-02
+
+### Features
+
+- **Custom System Prompt** - New `systemPrompt` config option to customize or extend the default system prompt
+- **Chrome Extension** - Extension with multi-tab control, main-world API with token auth, and tab lifecycle management
+
+### Improvements
+
+- Renamed `include_attributes` to `includeAttributes` in PageController config (camelCase consistency)
+- Lazy-loaded mask module for faster initialization
+- Better date formatting and error messages from LLM client
+- Added `rawRequest` to step history for easier debugging
+
+### Bug Fixes
+
+- Fixed CSP errors by using local SVGs for cursor mask instead of inline styles
+- Fixed `AbortError` being incorrectly retried and shown to users
+- Fixed mask not working correctly when starting a new task after stopping a previous one
+
+---
+
+## [1.0.0] - 2026-01-19
+
+### 🎉 First Stable Release
+
+PageAgent is now ready for production use. The API is stable and breaking changes will follow semantic versioning.
+
+### Features
+
+#### Core
+
+- **PageAgent** - Main entry class with built-in UI Panel
+- **PageAgentCore** - Headless agent class for custom UI or programmatic use
+- **DOM Analysis** - Text-based DOM extraction with high-intensity dehydration
+- **LLM Support** - Works with OpenAI, Claude, DeepSeek, Qwen, and other OpenAI-compatible APIs
+- **Tool System** - Built-in tools for click, input, scroll, select, and more
+- **Custom Tools** - Extend agent capabilities with your own tools (experimental)
+- **Lifecycle Hooks** - Hook into agent execution (experimental)
+- **Instructions System** - System-level and page-level instructions to guide agent behavior
+- **Data Masking** - Transform page content before sending to LLM
+
+#### Page Controller
+
+- **Element Interactions** - Click, input text, select options, scroll
+- **Visual Mask** - Blocks user interaction during automation
+- **DOM Tree Extraction** - Efficient page structure extraction for LLM consumption
+
+#### UI
+
+- **Interactive Panel** - Real-time task progress and agent thinking display
+- **Ask User Tool** - Agent can ask users for clarification
+- **i18n Support** - English and Chinese localization
+
+### Configuration
+
+```typescript
+interface PageAgentConfig {
+    // LLM Configuration (required)
+    baseURL: string
+    apiKey: string
+    model: string
+    temperature?: number
+    maxRetries?: number
+    customFetch?: typeof fetch
+
+    // Agent Configuration
+    language?: 'en-US' | 'zh-CN'
+    maxSteps?: number // default: 20
+    customTools?: Record<string, PageAgentTool> // experimental
+    instructions?: InstructionsConfig
+    transformPageContent?: (content: string) => string | Promise<string>
+    experimentalScriptExecutionTool?: boolean // default: false
+
+    // Lifecycle Hooks (experimental)
+    onBeforeTask?: (agent, result) => void
+    onAfterTask?: (agent, result) => void
+    onBeforeStep?: (agent, stepCount) => void
+    onAfterStep?: (agent, history) => void
+    onDispose?: (agent, reason?) => void
+
+    // Page Controller Configuration
+    enableMask?: boolean // default: true
+    viewportExpansion?: number
+    interactiveBlacklist?: Element[]
+    interactiveWhitelist?: Element[]
+}
+```
+
+### Packages
+
+| Package                       | Description                        |
+| ----------------------------- | ---------------------------------- |
+| `page-agent`                  | Main entry with UI Panel           |
+| `@page-agent/core`            | Core agent logic without UI        |
+| `@page-agent/llms`            | LLM client with retry logic        |
+| `@page-agent/page-controller` | DOM operations and visual feedback |
+| `@page-agent/ui`              | Panel and i18n                     |
+
+### Known Limitations
+
+- Single-page application only (cannot navigate across pages)
+- No visual recognition (relies on DOM structure)
+- Limited interaction support (no hover, drag-drop, canvas operations)
+- See [Limitations](https://alibaba.github.io/page-agent/docs/introduction/limitations) for details
+
+### Acknowledgments
+
+This project builds upon the excellent work of [browser-use](https://github.com/browser-use/browser-use). DOM processing components and prompts are adapted from browser-use (MIT License).

docs/CODE_OF_CONDUCT.md

@@ -69,10 +69,10 @@ members of the project's leadership.
 
 ## Attribution
 
-This Code of Conduct is adapted from the [Contributor Covenant][https://www.contributor-covenant.org], version 1.4,
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 1.4,
 available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
 
-----
+---
 
 > Chinese Version
 > 《阿里巴巴开源行为准则》

docs/README-zh.md

@@ -0,0 +1,113 @@
+# Page Agent
+
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="https://img.alicdn.com/imgextra/i4/O1CN01qKig1P1FnhpFKNdi6_!!6000000000532-2-tps-1280-256.png">
+  <img alt="Page Agent Banner" src="https://img.alicdn.com/imgextra/i1/O1CN01NCMKXj1Gn4tkFTsxf_!!6000000000666-2-tps-1280-256.png">
+</picture>
+
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/) [![Downloads](https://img.shields.io/npm/dt/page-agent.svg)](https://www.npmjs.com/package/page-agent) [![Bundle Size](https://img.shields.io/bundlephobia/minzip/page-agent)](https://bundlephobia.com/package/page-agent) [![GitHub stars](https://img.shields.io/github/stars/alibaba/page-agent.svg)](https://github.com/alibaba/page-agent)
+
+纯 JS 实现的 GUI agent。使用自然语言操作你的 Web 应用。无须后端、客户端、浏览器插件。
+
+🌐 [English](../README.md) | **中文**
+
+👉 <a href="https://alibaba.github.io/page-agent/" target="_blank"><b>🚀 Demo</b></a> | <a href="https://alibaba.github.io/page-agent/docs/introduction/overview" target="_blank"><b>📖 Documentation</b></a>
+
+<video id="demo-video" src="https://github.com/user-attachments/assets/11aed429-b69c-49d5-8982-fa99b4a0e9a8" controls crossorigin muted></video>
+
+---
+
+## ✨ Features
+
+- **🎯 轻松集成**
+    - 无需 `浏览器插件` / `Python` / `无头浏览器`。
+    - 纯页面内 JavaScript，一切都在你的网页中完成。
+    - The best tool for your agent to control web pages.
+- **📖 基于文本的 DOM 操作**
+    - 无需截图，无需 OCR 或多模态模型。
+    - 无需特殊权限。
+- **🧠 用你自己的 LLM**
+- **🎨 精美 UI，支持人机协同**
+- **🐙 可选的 [Chrome 扩展](https://alibaba.github.io/page-agent/docs/features/chrome-extension)，支持跨页面任务。**
+
+## 💡 应用场景
+
+- **SaaS AI 副驾驶** — 几行代码为你的产品加上 AI 副驾驶，不需要重写后端。
+- **智能表单填写** — 把 20 次点击变成一句话。ERP、CRM、管理后台的最佳拍档。
+- **无障碍增强** — 用自然语言让任何网页无障碍。语音指令、屏幕阅读器，零门槛。
+- **跨页面 Agent** — 通过可选的 [Chrome 扩展](https://alibaba.github.io/page-agent/docs/features/chrome-extension)，让你的 Agent 跨标签页工作。
+
+## 🚀 快速开始
+
+### 一行代码集成
+
+通过我们免费的 Demo LLM 快速体验 PageAgent：
+
+```html
+<script src="{URL}" crossorigin="true"></script>
+```
+
+| Mirrors | URL                                                                                |
+| ------- | ---------------------------------------------------------------------------------- |
+| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.4.0/dist/iife/page-agent.demo.js         |
+| China   | https://registry.npmmirror.com/page-agent/1.4.0/files/dist/iife/page-agent.demo.js |
+
+> **⚠️ 仅用于技术评估。** 该 Demo CDN 使用了免费的[测试 LLM API](https://alibaba.github.io/page-agent/docs/features/models#free-testing-api)，使用即表示您同意其[条款](https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md)。
+
+### NPM 安装
+
+```bash
+npm install page-agent
+```
+
+```javascript
+import { PageAgent } from 'page-agent'
+
+const agent = new PageAgent({
+    model: 'qwen3.5-plus',
+    baseURL: 'https://dashscope.aliyuncs.com/compatible-mode/v1',
+    apiKey: 'YOUR_API_KEY',
+    language: 'zh-CN',
+})
+
+await agent.execute('点击登录按钮')
+```
+
+更多编程用法，请参阅 [📖 文档](https://alibaba.github.io/page-agent/docs/introduction/overview)。
+
+## 🤝 贡献
+
+欢迎社区贡献！请参阅 [CONTRIBUTING.md](../CONTRIBUTING.md) 了解环境配置和本地开发说明。
+
+请在贡献前阅读[行为准则](CODE_OF_CONDUCT.md)。
+
+## 👏 致谢
+
+本项目基于 **[`browser-use`](https://github.com/browser-use/browser-use)** 的优秀工作构建。
+
+`PageAgent` 专为**客户端网页增强**设计，不是服务端自动化工具。
+
+```
+DOM processing components and prompt are derived from browser-use:
+
+Browser Use
+Copyright (c) 2024 Gregor Zunic
+Licensed under the MIT License
+
+Original browser-use project: <https://github.com/browser-use/browser-use>
+
+We gratefully acknowledge the browser-use project and its contributors for their
+excellent work on web automation and DOM interaction patterns that helped make
+this project possible.
+
+Third-party dependencies and their licenses can be found in the package.json
+file and in the node_modules directory after installation.
+```
+
+## 📄 许可证
+
+[MIT License](../LICENSE)
+
+---
+
+**⭐ 如果觉得 PageAgent 有用或有趣，请给项目点个星！**

docs/terms-and-privacy.md

@@ -0,0 +1,83 @@
+# Terms of Use & Privacy
+
+**Last updated:** February 2026
+
+"We" in this document refers to the maintainers of the open-source Page Agent project (https://github.com/alibaba/page-agent). This document covers the Page Agent software itself and the testing services we provide — **not** any third-party product or service built with it.
+
+---
+
+## 1. Open Source Software Privacy
+
+Page Agent (PageAgent.js and Page Agent Extension) is a **client-side only** tool with a "Bring Your Own Key" (BYOK) architecture. The software itself does **not** include any backend service. The software does **not** collect or transmit any user data on its own, and the maintainers do **not** have access to your browsing activity, page content, or task instructions through the software.
+
+All data transmission occurs **only** between your browser and the LLM provider you configure. You are in full control of which provider receives your data.
+
+- You choose which LLM provider to use
+- You may configure your own API endpoint at any time
+- The project is open source and can be audited: https://github.com/alibaba/page-agent
+
+---
+
+## 2. Testing API and Demo Disclaimer & Terms of Use
+
+To facilitate easy testing and technical evaluation, we provide a free testing LLM API. This API is used in the project homepage's live demo, the pre-built demo CDN bundles, and the browser extension's default configuration. Users may also use it independently for their own technical evaluation of page-agent.
+
+This free testing API is provided **strictly for technical evaluation and R&D purposes only**. It must not be used in any production environment. By using this service, you agree to the following terms:
+
+**No Sensitive Data**: You are strictly prohibited from inputting any Personal Identifiable Information (PII), confidential business data, financial/medical records, or using this agent on web pages containing such sensitive information.
+
+**Zero Data Retention**: We do not store, log, or use your prompts or webpage data (DOM) for model training. All data is processed in-transit and immediately discarded. However, we do temporarily process necessary, identity-agnostic network data (such as IP addresses) solely for rate-limiting and anti-abuse purposes.
+
+**Independent Infrastructure**: The `page-agent` open-source software is completely frontend-based with a "Bring Your Own Key" (BYOK) architecture and no built-in backend. To facilitate easy testing, the maintainers have independently purchased public cloud services from Alibaba Cloud China ([aliyun.com](https://www.aliyun.com) FC and BaiLian Qwen models). This project is not affiliated with, nor endorsed by, Alibaba Cloud.
+
+**No Guaranteed Availability**: This testing API may be rate-limited, degraded, or discontinued at any time without prior notice.
+
+**"AS IS" & Limitation of Liability**: This service is provided strictly on an "AS IS" and "AS AVAILABLE" basis, without any warranties. The maintainers bear no liability for any data loss, service interruption, or legal consequences arising from your use of this demo.
+
+**Recommendation for Real Usage**: For secure and continuous usage, we strongly advise using the default BYOK mode with your own legally compliant commercial LLM API keys, or connecting to local, offline models (e.g., Ollama).
+
+**Note**: This service processes data via servers located in Mainland China. If you are located in a region with strict data localization laws (such as the EU/EEA), please do not use this demo.
+
+---
+
+## 3. Browser Extension (Page Agent Ext)
+
+### Data Processing
+
+The extension performs DOM analysis and automation actions **locally in your browser**. Your browsing history, passwords, and form data are not accessed or collected by the extension developer.
+
+Data is transmitted to external servers **only when you initiate an automation task**. When this occurs:
+
+- Your task instructions (natural language commands)
+- Simplified page structure (cleaned DOM) of all pages under the extension's control
+
+are sent to the LLM API endpoint configured in **your settings**.
+
+> **Note:** The DOM cleaning process simplifies page structure for AI readability but **does not guarantee removal of sensitive information** (e.g., visible text, form values, or personal data on the page). Please be mindful of the page content when initiating tasks.
+
+**If you configure a third-party LLM provider** (e.g., OpenAI, Anthropic, or others), data is sent directly to that provider. Their privacy policies apply.
+
+**If you use the built-in testing API**, the terms in [Section 2](#2-testing-api-and-demo-disclaimer--terms-of-use) apply. By using the extension with the default testing API, you agree to those terms.
+
+### Data Storage
+
+- **Local storage only**: Your configuration (API endpoint, API key, model selection) is stored in your browser via `chrome.storage.local`
+- **No cloud sync**: Configuration is not synced to any external server
+- **No analytics**: The extension does not include any analytics or tracking code
+
+### Your Control
+
+- The extension is open source and can be audited by anyone
+- You choose which LLM provider to use
+- You may configure your own API endpoint at any time
+- You can clear all stored data by removing the extension
+
+---
+
+## Changes
+
+We may update these terms as the project evolves.
+
+## Contact
+
+https://github.com/alibaba/page-agent/issues

eslint.config.js

@@ -8,7 +8,13 @@ import globals from 'globals'
 import tseslint from 'typescript-eslint'
 
 export default defineConfig([
-	globalIgnores(['**/dist', '**/node_modules', 'packages/website/src/components/ui']),
+	globalIgnores([
+		'**/dist',
+		'**/node_modules',
+		'packages/*/src/components/ui',
+		'**/.wxt',
+		'**/.output',
+	]),
 	{
 		plugins: {
 			'react-hooks': reactHooks,
@@ -69,6 +75,8 @@ export default defineConfig([
 			'react-dom/no-missing-button-type': 'off',
 			'react-x/no-nested-component-definitions': 'off',
 			'@typescript-eslint/prefer-optional-chain': 'off',
+			'@typescript-eslint/use-unknown-in-catch-callback-variable': 'off',
+			'@typescript-eslint/no-unnecessary-type-parameters': 'off',
 
 			// 'require-await': 'off',
 			'@typescript-eslint/require-await': 'off',

package.json

@@ -1,107 +1,127 @@
 {
-	"name": "root",
-	"private": true,
-	"version": "0.2.2",
-	"type": "module",
-	"workspaces": [
-		"packages/page-controller",
-		"packages/ui",
-		"packages/llms",
-		"packages/page-agent",
-		"packages/cdn",
-		"packages/website"
-	],
-	"description": "AI-powered UI agent for web applications",
-	"author": "Simon<gaomeng1900>",
-	"license": "MIT",
-	"repository": {
-		"type": "git",
-		"url": "https://github.com/alibaba/page-agent.git"
-	},
-	"homepage": "https://alibaba.github.io/page-agent/",
-	"engines": {
-		"node": ">=20.0.0",
-		"npm": ">=10.0.0"
-	},
-	"scripts": {
-		"cleanup": "rm -rf packages/*/dist",
-		"start": "npm run dev --workspace=@page-agent/website",
-		"build:website": "npm run build:website --workspace=@page-agent/website",
-		"build:libs": "npm run build --workspaces --if-present",
-		"build": "npm run build:libs && npm run build:website",
-		"dev:iife": "npm run dev:iife --workspace=page-agent",
-		"version": "node scripts/sync-version.js",
-		"lint": "eslint .",
-		"prepare": "husky"
-	},
-	"devDependencies": {
-		"@commitlint/cli": "^20.3.1",
-		"@commitlint/config-conventional": "^20.3.1",
-		"@eslint/js": "^9.39.2",
-		"@microsoft/api-extractor": "^7.55.2",
-		"@trivago/prettier-plugin-sort-imports": "^6.0.2",
-		"@types/node": "^25.0.7",
-		"concurrently": "^9.2.1",
-		"dotenv": "^17.2.3",
-		"eslint": "^9.39.2",
-		"eslint-config-prettier": "^10.1.8",
-		"eslint-plugin-react-dom": "^2.5.7",
-		"eslint-plugin-react-hooks": "^7.0.1",
-		"eslint-plugin-react-refresh": "^0.4.26",
-		"eslint-plugin-react-x": "^2.5.7",
-		"globals": "^17.0.0",
-		"husky": "^9.1.7",
-		"lint-staged": "^16.2.4",
-		"prettier": "^3.7.4",
-		"typescript": "^5.9.3",
-		"typescript-eslint": "^8.53.0",
-		"unplugin-dts": "^1.0.0-beta.6",
-		"vite": "^7.3.1",
-		"vite-plugin-css-injected-by-js": "^3.5.2"
-	},
-	"overrides": {
-		"typescript": "^5.9.3"
-	},
-	"lint-staged": {
-		"*.{js,ts,cjs,cts,mjs,mts}": [
-			"npx prettier --write --ignore-unknown",
-			"npx eslint --quiet"
-		],
-		"*.{jsx,tsx}": [
-			"npx prettier --write --ignore-unknown",
-			"npx eslint --quiet"
-		],
-		"*.css": [
-			"npx prettier --write --ignore-unknown"
-		]
-	},
-	"commitlint": {
-		"extends": [
-			"@commitlint/config-conventional"
-		],
-		"rules": {
-			"subject-case": [
-				0,
-				"never"
-			]
-		}
-	},
-	"prettier": {
-		"singleQuote": true,
-		"semi": false,
-		"useTabs": true,
-		"printWidth": 100,
-		"trailingComma": "es5",
-		"plugins": [
-			"@trivago/prettier-plugin-sort-imports"
-		],
-		"importOrder": [
-			"<THIRD_PARTY_MODULES>",
-			"^(@/).*(?<!css)$",
-			"^[./].*(?<!css)$",
-			".css$"
-		],
-		"importOrderSeparation": true,
-		"importOrderSortSpecifiers": true
-	}
+    "name": "root",
+    "private": true,
+    "version": "1.4.0",
+    "type": "module",
+    "workspaces": [
+        "packages/page-controller",
+        "packages/ui",
+        "packages/llms",
+        "packages/core",
+        "packages/page-agent",
+        "packages/extension",
+        "packages/website"
+    ],
+    "description": "AI-powered UI agent for web applications",
+    "author": "Simon<gaomeng1900>",
+    "license": "MIT",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/alibaba/page-agent.git"
+    },
+    "homepage": "https://alibaba.github.io/page-agent/",
+    "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+    },
+    "scripts": {
+        "cleanup": "rm -rf packages/*/dist",
+        "start": "npm run dev --workspace=@page-agent/website",
+        "build:website": "npm run build:website --workspace=@page-agent/website",
+        "build:libs": "npm run build --workspaces --if-present",
+        "build": "npm run build:libs && npm run build:website",
+        "dev:demo": "npm run dev:demo --workspace=page-agent",
+        "version": "node scripts/sync-version.js",
+        "lint": "eslint .",
+        "prepare": "husky"
+    },
+    "devDependencies": {
+        "@commitlint/cli": "^20.4.2",
+        "@commitlint/config-conventional": "^20.4.2",
+        "@eslint/js": "^9.39.2",
+        "@microsoft/api-extractor": "^7.57.3",
+        "@tailwindcss/vite": "^4.2.1",
+        "@trivago/prettier-plugin-sort-imports": "^6.0.2",
+        "@types/node": "^25.3.0",
+        "@vitejs/plugin-react-swc": "^4.1.0",
+        "chalk": "^5.6.2",
+        "concurrently": "^9.2.1",
+        "dotenv": "^17.3.1",
+        "eslint": "^9.39.2",
+        "eslint-config-prettier": "^10.1.8",
+        "eslint-plugin-react-dom": "^2.13.0",
+        "eslint-plugin-react-hooks": "^7.0.1",
+        "eslint-plugin-react-refresh": "^0.5.2",
+        "eslint-plugin-react-x": "^2.13.0",
+        "globals": "^17.0.0",
+        "husky": "^9.1.7",
+        "lint-staged": "^16.2.4",
+        "prettier": "^3.8.0",
+        "typescript": "^5.9.3",
+        "typescript-eslint": "^8.56.1",
+        "unplugin-dts": "^1.0.0-beta.6",
+        "vite": "^7.3.1",
+        "vite-plugin-css-injected-by-js": "^3.5.2",
+        "vite-bundle-analyzer": "^1.3.6"
+    },
+    "overrides": {
+        "typescript": "^5.9.3"
+    },
+    "lint-staged": {
+        "*.{js,ts,cjs,cts,mjs,mts}": [
+            "npx prettier --write --ignore-unknown",
+            "npx eslint --quiet"
+        ],
+        "*.{jsx,tsx}": [
+            "npx prettier --write --ignore-unknown",
+            "npx eslint --quiet"
+        ],
+        "*.css": [
+            "npx prettier --write --ignore-unknown"
+        ]
+    },
+    "commitlint": {
+        "extends": [
+            "@commitlint/config-conventional"
+        ],
+        "rules": {
+            "subject-case": [
+                0,
+                "never"
+            ]
+        }
+    },
+    "prettier": {
+        "singleQuote": true,
+        "semi": false,
+        "useTabs": true,
+        "printWidth": 100,
+        "trailingComma": "es5",
+        "plugins": [
+            "@trivago/prettier-plugin-sort-imports"
+        ],
+        "importOrder": [
+            "<THIRD_PARTY_MODULES>",
+            "^(@/).*(?<!css)$",
+            "^[./].*(?<!css)$",
+            ".css$"
+        ],
+        "importOrderSeparation": true,
+        "importOrderSortSpecifiers": true,
+        "overrides": [
+            {
+                "files": "*.md",
+                "options": {
+                    "useTabs": false,
+                    "tabWidth": 4
+                }
+            },
+            {
+                "files": "*.json",
+                "options": {
+                    "useTabs": false,
+                    "tabWidth": 4
+                }
+            }
+        ]
+    }
 }

packages/cdn/package.json

@@ -1,23 +0,0 @@
-{
-	"name": "@page-agent/cdn",
-	"private": false,
-	"version": "0.2.2",
-	"type": "module",
-	"files": [
-		"dist/"
-	],
-	"description": "CDN builds for page-agent - IIFE bundles for script tag usage",
-	"author": "Simon<gaomeng1900>",
-	"license": "MIT",
-	"repository": {
-		"type": "git",
-		"url": "https://github.com/alibaba/page-agent.git"
-	},
-	"homepage": "https://alibaba.github.io/page-agent/",
-	"scripts": {
-		"build": "vite build && vite build --mode demo"
-	},
-	"dependencies": {
-		"page-agent": "0.2.2"
-	}
-}

packages/cdn/src/demo.js

@@ -1,64 +0,0 @@
-// @ts-nocheck
-/**
- * Demo CDN build for page-agent
- * Auto-initializes with built-in demo API for testing
- *
- * Usage:
- *   <script src="https://unpkg.com/@page-agent/cdn/dist/page-agent.demo.js"></script>
- */
-import { PageAgent } from 'page-agent'
-
-// Clean up existing instances to prevent multiple injections from bookmarklet
-if (window.pageAgent) {
-	window.pageAgent.dispose()
-}
-
-// Mount to global window object
-window.PageAgent = PageAgent
-
-// Export for IIFE
-export { PageAgent }
-
-console.log('🚀 page-agent.js loaded!')
-
-const DEMO_MODEL = 'PAGE-AGENT-FREE-TESTING-RANDOM'
-const DEMO_BASE_URL = 'https://hwcxiuzfylggtcktqgij.supabase.co/functions/v1/llm-testing-proxy'
-const DEMO_API_KEY = 'PAGE-AGENT-FREE-TESTING-RANDOM'
-
-// Demo warning
-console.log(
-	'%c⚠️ DEMO MODE %c\n' +
-		'This build uses a shared testing LLM with rate limits.\n' +
-		'For production, use page-agent.js with your own API key:\n' +
-		'https://alibaba.github.io/page-agent/#/docs/features/models',
-	'background: #f59e0b; color: #000; font-size: 14px; font-weight: bold; padding: 4px 8px; border-radius: 4px;',
-	'color: #f59e0b; font-size: 12px;'
-)
-
-// in case document.x is not ready yet
-setTimeout(() => {
-	const currentScript = document.currentScript
-
-	if (currentScript) {
-		console.log('🚀 page-agent.js detected current script:', currentScript.src)
-		const url = new URL(currentScript.src)
-		const model = url.searchParams.get('model') || DEMO_MODEL
-		const baseURL = url.searchParams.get('baseURL') || DEMO_BASE_URL
-		const apiKey = url.searchParams.get('apiKey') || DEMO_API_KEY
-		const language = url.searchParams.get('lang') || 'zh-CN'
-		const config = { model, baseURL, apiKey, language }
-		window.pageAgent = new PageAgent(config)
-	} else {
-		console.log('🚀 page-agent.js no current script detected, using default demo config')
-		const config = {
-			model: DEMO_MODEL,
-			baseURL: DEMO_BASE_URL,
-			apiKey: DEMO_API_KEY,
-		}
-		window.pageAgent = new PageAgent(config)
-	}
-
-	console.log('🚀 page-agent.js initialized with config:', window.pageAgent.config)
-
-	window.pageAgent.panel.show()
-})

packages/cdn/src/full.js

@@ -1,15 +0,0 @@
-// @ts-nocheck
-/**
- * Full CDN build for page-agent
- * Exposes PageAgent class for manual instantiation and configuration
- *
- * Usage:
- *   <script src="https://unpkg.com/@page-agent/cdn/dist/page-agent.js"></script>
- *   <script>
- *     const agent = new PageAgent({ model: 'gpt-4o', apiKey: 'your-key' })
- *     agent.panel.show()
- *   </script>
- */
-import { PageAgent } from 'page-agent'
-
-export { PageAgent }

packages/cdn/vite.config.js

@@ -1,49 +0,0 @@
-// @ts-nocheck
-import { dirname, resolve } from 'path'
-import { fileURLToPath } from 'url'
-import { defineConfig } from 'vite'
-import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
-
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
-/**
- * CDN IIFE builds for page-agent
- *
- * Build targets (via --mode):
- * - demo: page-agent.demo.js with auto-init and built-in API
- * - full (default): page-agent.js exposes PageAgent class only
- */
-export default defineConfig(({ mode }) => {
-	const isDemo = mode === 'demo'
-	const entry = isDemo ? resolve(__dirname, 'src/demo.js') : resolve(__dirname, 'src/full.js')
-	const fileName = isDemo ? 'page-agent.demo' : 'page-agent'
-
-	return {
-		plugins: [cssInjectedByJsPlugin({ relativeCSSInjection: true })],
-		publicDir: false,
-		esbuild: {
-			keepNames: true,
-		},
-		build: {
-			lib: {
-				entry,
-				name: 'PageAgent',
-				fileName: () => `${fileName}.js`,
-				formats: ['iife'],
-			},
-			outDir: resolve(__dirname, 'dist'),
-			emptyOutDir: !isDemo, // only empty on first build (full)
-			minify: false,
-			cssCodeSplit: true,
-			rollupOptions: {
-				onwarn: function (message, handler) {
-					if (message.code === 'EVAL') return
-					handler(message)
-				},
-			},
-		},
-		define: {
-			'process.env.NODE_ENV': '"production"',
-		},
-	}
-})

packages/core/package.json

@@ -0,0 +1,51 @@
+{
+    "name": "@page-agent/core",
+    "private": false,
+    "version": "1.4.0",
+    "type": "module",
+    "main": "./dist/esm/page-agent-core.js",
+    "module": "./dist/esm/page-agent-core.js",
+    "types": "./dist/esm/PageAgentCore.d.ts",
+    "exports": {
+        ".": {
+            "types": "./dist/esm/PageAgentCore.d.ts",
+            "import": "./dist/esm/page-agent-core.js",
+            "default": "./dist/esm/page-agent-core.js"
+        }
+    },
+    "files": [
+        "dist/"
+    ],
+    "description": "GUI agent for web applications - add intelligent automation to any webpage with a single script",
+    "keywords": [
+        "ai",
+        "automation",
+        "ui-agent",
+        "GUI-agent",
+        "browser-automation",
+        "web-agent",
+        "llm",
+        "dom-interaction",
+        "web-automation",
+        "GUI-simulation"
+    ],
+    "author": "Simon<gaomeng1900>",
+    "license": "MIT",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/alibaba/page-agent.git"
+    },
+    "homepage": "https://alibaba.github.io/page-agent/",
+    "scripts": {
+        "build": "vite build",
+        "dev:iife": "concurrently \"vite build --config vite.iife.config.js --watch\" \"npx serve dist/iife -p 5174\"",
+        "prepublishOnly": "node -e \"const fs=require('fs');['README.md','LICENSE'].forEach(f=>fs.copyFileSync('../../'+f,f))\"",
+        "postpublish": "node -e \"['README.md','LICENSE'].forEach(f=>{try{require('fs').unlinkSync(f)}catch{}})\""
+    },
+    "dependencies": {
+        "chalk": "^5.6.2",
+        "zod": "^4.3.5",
+        "@page-agent/llms": "1.4.0",
+        "@page-agent/page-controller": "1.4.0"
+    }
+}

packages/core/src/PageAgentCore.ts

@@ -0,0 +1,630 @@
+/**
+ * Copyright (C) 2025 Alibaba Group Holding Limited
+ * All rights reserved.
+ */
+import { InvokeError, LLM, type Tool } from '@page-agent/llms'
+import type { BrowserState, PageController } from '@page-agent/page-controller'
+import chalk from 'chalk'
+import * as z from 'zod'
+
+import { type PageAgentConfig, type SupportedLanguage } from './config'
+import { DEFAULT_MAX_STEPS } from './config/constants'
+import SYSTEM_PROMPT from './prompts/system_prompt.md?raw'
+import { tools } from './tools'
+import type {
+	AgentActivity,
+	AgentReflection,
+	AgentStatus,
+	AgentStepEvent,
+	ExecutionResult,
+	HistoricalEvent,
+	MacroToolInput,
+	MacroToolResult,
+} from './types'
+import { assert, normalizeResponse, uid, waitFor } from './utils'
+
+export { type PageAgentConfig }
+export type { SupportedLanguage }
+export { tool, type PageAgentTool } from './tools'
+export type * from './types'
+
+/**
+ * AI agent for browser automation.
+ *
+ * @remarks
+ * ## Re-act Agent Loop
+ * - step
+ *    - observe (gather information about current environment and context)
+ *    - think (LLM calling)
+ *      - reflection (evaluate history, generate memory, short-term planning)
+ *      - action (give the action to approach the next goal)
+ *    - act (execute the action)
+ * - loop
+ *
+ * ## Event System
+ * - `statuschange` - Agent status transitions (idle → running → completed/error)
+ * - `historychange` - History events updated (persistent, part of agent memory)
+ * - `activity` - Real-time activity feedback (transient, for UI only)
+ * - `dispose` - Agent cleanup triggered
+ *
+ * ## Information Streams
+ * 1. **History Events** (`history` array)
+ *    - Persistent event stream that forms agent's memory
+ *    - Included in LLM context across steps
+ *    - Types: steps, observations, user takeovers, llm errors
+ *
+ * 2. **Activity Events** (via `activity` event)
+ *    - Transient UI feedback during task execution
+ *    - NOT included in LLM context
+ *    - Types: thinking, executing, executed, retrying, error
+ */
+export class PageAgentCore extends EventTarget {
+	readonly id = uid()
+	readonly config: PageAgentConfig & { maxSteps: number }
+	readonly tools: typeof tools
+	/** PageController for DOM operations */
+	readonly pageController: PageController
+
+	task = ''
+	taskId = ''
+	/** History events */
+	history: HistoricalEvent[] = []
+	/** Whether this agent has been disposed */
+	disposed = false
+
+	/**
+	 * Callback for when agent needs user input (ask_user tool)
+	 * If not set, ask_user tool will be disabled
+	 * @example onAskUser: (q) => window.prompt(q) || ''
+	 */
+	onAskUser?: (question: string) => Promise<string>
+
+	#status: AgentStatus = 'idle'
+	#llm: LLM
+	#abortController = new AbortController()
+	#observations: string[] = []
+
+	/** internal states during a single task execution */
+	#states = {
+		/** Accumulated wait time in seconds */
+		totalWaitTime: 0,
+		/** For detecting navigation */
+		lastURL: '',
+		/** Browser state */
+		browserState: null as BrowserState | null,
+	}
+
+	constructor(config: PageAgentConfig & { pageController: PageController }) {
+		super()
+
+		this.config = { ...config, maxSteps: config.maxSteps || DEFAULT_MAX_STEPS }
+
+		this.#llm = new LLM(this.config)
+		this.tools = new Map(tools)
+		this.pageController = config.pageController
+
+		// Listen to LLM retry events
+		this.#llm.addEventListener('retry', (e) => {
+			const { attempt, maxAttempts } = (e as CustomEvent).detail
+			this.#emitActivity({ type: 'retrying', attempt, maxAttempts })
+			// Also push to history for panel rendering
+			this.history.push({
+				type: 'retry',
+				message: `LLM retry attempt ${attempt} of ${maxAttempts}`,
+				attempt,
+				maxAttempts,
+			})
+			this.#emitHistoryChange()
+		})
+		this.#llm.addEventListener('error', (e) => {
+			const error = (e as CustomEvent).detail.error as Error | InvokeError
+			if ((error as any)?.rawError?.name === 'AbortError') return
+			const message = String(error)
+			this.#emitActivity({ type: 'error', message })
+			// Also push to history for panel rendering
+			this.history.push({
+				type: 'error',
+				message,
+				rawResponse: (error as InvokeError).rawResponse,
+			})
+			this.#emitHistoryChange()
+		})
+
+		if (this.config.customTools) {
+			for (const [name, tool] of Object.entries(this.config.customTools)) {
+				if (tool === null) {
+					this.tools.delete(name)
+					continue
+				}
+				this.tools.set(name, tool)
+			}
+		}
+
+		if (!this.config.experimentalScriptExecutionTool) {
+			this.tools.delete('execute_javascript')
+		}
+	}
+
+	/** Get current agent status */
+	get status(): AgentStatus {
+		return this.#status
+	}
+
+	/** Emit statuschange event */
+	#emitStatusChange(): void {
+		this.dispatchEvent(new Event('statuschange'))
+	}
+
+	/** Emit historychange event */
+	#emitHistoryChange(): void {
+		this.dispatchEvent(new Event('historychange'))
+	}
+
+	/**
+	 * Emit activity event - for transient UI feedback
+	 * @param activity - Current agent activity
+	 */
+	#emitActivity(activity: AgentActivity): void {
+		this.dispatchEvent(new CustomEvent('activity', { detail: activity }))
+	}
+
+	/** Update status and emit event */
+	#setStatus(status: AgentStatus): void {
+		if (this.#status !== status) {
+			this.#status = status
+			this.#emitStatusChange()
+		}
+	}
+
+	/**
+	 * Push a observation message to the history event stream.
+	 * This will be visible in <agent_history> and remain persistent in memory across steps.
+	 * @experimental @internal
+	 * @note history change will be emitted before next step starts
+	 */
+	pushObservation(content: string): void {
+		this.#observations.push(content)
+	}
+
+	/** Stop the current task. Agent remains reusable. */
+	stop() {
+		this.pageController.cleanUpHighlights()
+		this.pageController.hideMask()
+		this.#abortController.abort()
+	}
+
+	async execute(task: string): Promise<ExecutionResult> {
+		if (this.disposed) throw new Error('PageAgent has been disposed. Create a new instance.')
+		if (!task) throw new Error('Task is required')
+		this.task = task
+		this.taskId = uid()
+
+		// Disable ask_user tool if onAskUser is not set
+		if (!this.onAskUser) {
+			this.tools.delete('ask_user')
+		}
+
+		const onBeforeStep = this.config.onBeforeStep
+		const onAfterStep = this.config.onAfterStep
+		const onBeforeTask = this.config.onBeforeTask
+		const onAfterTask = this.config.onAfterTask
+
+		await onBeforeTask?.(this)
+
+		// Show mask
+		await this.pageController.showMask()
+
+		if (this.#abortController) {
+			this.#abortController.abort()
+			this.#abortController = new AbortController()
+		}
+
+		this.history = []
+		this.#setStatus('running')
+		this.#emitHistoryChange()
+
+		// Reset internal states
+		this.#states = { totalWaitTime: 0, lastURL: '', browserState: null }
+
+		let step = 0
+
+		while (true) {
+			try {
+				console.group(`step: ${step}`)
+
+				await onBeforeStep?.(this, step)
+
+				// observe
+
+				console.log(chalk.blue.bold('👀 Observing...'))
+
+				this.#states.browserState = await this.pageController.getBrowserState()
+				await this.#handleObservations(step)
+
+				// assemble prompts
+
+				const messages = [
+					{ role: 'system' as const, content: this.#getSystemPrompt() },
+					{ role: 'user' as const, content: await this.#assembleUserPrompt() },
+				]
+
+				const macroTool = { AgentOutput: this.#packMacroTool() }
+
+				// invoke LLM
+
+				console.log(chalk.blue.bold('🧠 Thinking...'))
+				this.#emitActivity({ type: 'thinking' })
+
+				const result = await this.#llm.invoke(messages, macroTool, this.#abortController.signal, {
+					toolChoiceName: 'AgentOutput',
+					normalizeResponse: (res) => normalizeResponse(res, this.tools),
+				})
+
+				// assemble history
+
+				const macroResult = result.toolResult as MacroToolResult
+				const input = macroResult.input
+				const output = macroResult.output
+				const reflection: Partial<AgentReflection> = {
+					evaluation_previous_goal: input.evaluation_previous_goal,
+					memory: input.memory,
+					next_goal: input.next_goal,
+				}
+				const actionName = Object.keys(input.action)[0]
+				const action: AgentStepEvent['action'] = {
+					name: actionName,
+					input: input.action[actionName],
+					output: output,
+				}
+
+				this.history.push({
+					type: 'step',
+					stepIndex: step,
+					reflection,
+					action,
+					usage: result.usage,
+					rawResponse: result.rawResponse,
+					rawRequest: result.rawRequest,
+				} as AgentStepEvent)
+				this.#emitHistoryChange()
+
+				//
+
+				await onAfterStep?.(this, this.history)
+
+				console.groupEnd()
+
+				// finish task if done
+
+				if (actionName === 'done') {
+					const success = action.input?.success ?? false
+					const text = action.input?.text || 'no text provided'
+					console.log(chalk.green.bold('Task completed'), success, text)
+					this.#onDone(success)
+					const result: ExecutionResult = {
+						success,
+						data: text,
+						history: this.history,
+					}
+					await onAfterTask?.(this, result)
+					return result
+				}
+			} catch (error: unknown) {
+				console.groupEnd() // to prevent nested groups
+				const isAbortError = (error as any)?.rawError?.name === 'AbortError'
+
+				console.error('Task failed', error)
+				const errorMessage = isAbortError ? 'Task stopped' : String(error)
+				this.#emitActivity({ type: 'error', message: errorMessage })
+				this.history.push({ type: 'error', message: errorMessage, rawResponse: error })
+				this.#emitHistoryChange()
+				this.#onDone(false)
+				const result: ExecutionResult = {
+					success: false,
+					data: errorMessage,
+					history: this.history,
+				}
+				await onAfterTask?.(this, result)
+				return result
+			}
+
+			step++
+			if (step > this.config.maxSteps) {
+				const errorMessage = 'Step count exceeded maximum limit'
+				this.history.push({ type: 'error', message: errorMessage })
+				this.#emitHistoryChange()
+				this.#onDone(false)
+				const result: ExecutionResult = {
+					success: false,
+					data: errorMessage,
+					history: this.history,
+				}
+				await onAfterTask?.(this, result)
+				return result
+			}
+		}
+	}
+
+	/**
+	 * Merge all tools into a single MacroTool with the following input:
+	 * - thinking: string
+	 * - evaluation_previous_goal: string
+	 * - memory: string
+	 * - next_goal: string
+	 * - action: { toolName: toolInput }
+	 * where action must be selected from tools defined in this.tools
+	 */
+	#packMacroTool(): Tool<MacroToolInput, MacroToolResult> {
+		const tools = this.tools
+
+		const actionSchemas = Array.from(tools.entries()).map(([toolName, tool]) => {
+			return z.object({ [toolName]: tool.inputSchema }).describe(tool.description)
+		})
+
+		const actionSchema = z.union(actionSchemas as unknown as [z.ZodType, z.ZodType, ...z.ZodType[]])
+
+		const macroToolSchema = z.object({
+			// thinking: z.string().optional(),
+			evaluation_previous_goal: z.string().optional(),
+			memory: z.string().optional(),
+			next_goal: z.string().optional(),
+			action: actionSchema,
+		})
+
+		return {
+			description: 'You MUST call this tool every step!',
+			inputSchema: macroToolSchema as z.ZodType<MacroToolInput>,
+			execute: async (input: MacroToolInput): Promise<MacroToolResult> => {
+				// abort
+				if (this.#abortController.signal.aborted) throw new Error('AbortError')
+
+				console.log(chalk.blue.bold('MacroTool input'), input)
+				const action = input.action
+
+				const toolName = Object.keys(action)[0]
+				const toolInput = action[toolName]
+
+				// Build reflection text, only include non-empty fields
+				const reflectionLines: string[] = []
+				if (input.evaluation_previous_goal)
+					reflectionLines.push(`✅: ${input.evaluation_previous_goal}`)
+				if (input.memory) reflectionLines.push(`💾: ${input.memory}`)
+				if (input.next_goal) reflectionLines.push(`🎯: ${input.next_goal}`)
+
+				const reflectionText = reflectionLines.length > 0 ? reflectionLines.join('\n') : ''
+
+				if (reflectionText) {
+					console.log(reflectionText)
+				}
+
+				// Find the corresponding tool
+				const tool = tools.get(toolName)
+				assert(tool, `Tool ${toolName} not found`)
+
+				console.log(chalk.blue.bold(`Executing tool: ${toolName}`), toolInput)
+
+				// Emit executing activity
+				this.#emitActivity({ type: 'executing', tool: toolName, input: toolInput })
+
+				const startTime = Date.now()
+
+				// Execute tool, bind `this` to PageAgent
+				const result = await tool.execute.bind(this)(toolInput)
+
+				const duration = Date.now() - startTime
+				console.log(chalk.green.bold(`Tool (${toolName}) executed for ${duration}ms`), result)
+
+				// Emit executed activity
+				this.#emitActivity({
+					type: 'executed',
+					tool: toolName,
+					input: toolInput,
+					output: result,
+					duration,
+				})
+
+				// counting wait time
+				if (toolName === 'wait') {
+					this.#states.totalWaitTime += toolInput?.seconds || 0
+				} else {
+					this.#states.totalWaitTime = 0
+				}
+
+				// Return structured result
+				return {
+					input,
+					output: result,
+				}
+			},
+		}
+	}
+
+	/**
+	 * Get system prompt, dynamically replace language settings based on configured language
+	 */
+	#getSystemPrompt(): string {
+		if (this.config.customSystemPrompt) {
+			return this.config.customSystemPrompt
+		}
+
+		const targetLanguage = this.config.language === 'zh-CN' ? '中文' : 'English'
+		const systemPrompt = SYSTEM_PROMPT.replace(
+			/Default working language: \*\*.*?\*\*/,
+			`Default working language: **${targetLanguage}**`
+		)
+
+		return systemPrompt
+	}
+
+	/**
+	 * Get instructions from config
+	 */
+	async #getInstructions(): Promise<string> {
+		const { instructions } = this.config
+		if (!instructions) return ''
+
+		const systemInstructions = instructions.system?.trim()
+		let pageInstructions: string | undefined
+
+		const url = this.#states.browserState?.url || ''
+		if (instructions.getPageInstructions && url) {
+			try {
+				pageInstructions = instructions.getPageInstructions(url)?.trim()
+			} catch (error) {
+				console.error(
+					chalk.red('[PageAgent] Failed to execute getPageInstructions callback:'),
+					error
+				)
+			}
+		}
+		if (!systemInstructions && !pageInstructions) return ''
+
+		let result = '<instructions>\n'
+
+		if (systemInstructions) {
+			result += `<system_instructions>\n${systemInstructions}\n</system_instructions>\n`
+		}
+
+		if (pageInstructions) {
+			result += `<page_instructions>\n${pageInstructions}\n</page_instructions>\n`
+		}
+
+		result += '</instructions>\n\n'
+
+		return result
+	}
+
+	/**
+	 * Generate system observations before each step
+	 * @todo loop detection
+	 * @todo console error
+	 */
+	async #handleObservations(step: number): Promise<void> {
+		// Accumulated wait time warning
+		if (this.#states.totalWaitTime >= 3) {
+			this.pushObservation(
+				`You have waited ${this.#states.totalWaitTime} seconds accumulatively. DO NOT wait any longer unless you have a good reason.`
+			)
+		}
+
+		// Detect URL change
+		const currentURL = this.#states.browserState?.url || ''
+		if (currentURL !== this.#states.lastURL) {
+			this.pushObservation(`Page navigated to → ${currentURL}`)
+			this.#states.lastURL = currentURL
+			await waitFor(0.5) // wait for page to stabilize
+		}
+
+		// Remaining steps warning
+		const remaining = this.config.maxSteps - step
+		if (remaining === 5) {
+			this.pushObservation(
+				`⚠️ Only ${remaining} steps remaining. Consider wrapping up or calling done with partial results.`
+			)
+		} else if (remaining === 2) {
+			this.pushObservation(
+				`⚠️ Critical: Only ${remaining} steps left! You must finish the task or call done immediately.`
+			)
+		}
+
+		// Push observations to history and emit
+		if (this.#observations.length > 0) {
+			for (const content of this.#observations) {
+				this.history.push({ type: 'observation', content })
+				console.log(chalk.cyan('Observation:'), content)
+			}
+			this.#observations = []
+			this.#emitHistoryChange()
+		}
+	}
+
+	async #assembleUserPrompt(): Promise<string> {
+		const browserState = this.#states.browserState!
+
+		let prompt = ''
+
+		// <instructions> (optional)
+
+		prompt += await this.#getInstructions()
+
+		// <agent_state>
+		//  - <user_request>
+		//  - <step_info>
+		// <agent_state>
+
+		const stepCount = this.history.filter((e) => e.type === 'step').length
+
+		prompt += '<agent_state>\n'
+		prompt += '<user_request>\n'
+		prompt += `${this.task}\n`
+		prompt += '</user_request>\n'
+		prompt += '<step_info>\n'
+		prompt += `Step ${stepCount + 1} of ${this.config.maxSteps} max possible steps\n`
+		prompt += `Current time: ${new Date().toLocaleString()}\n`
+		prompt += '</step_info>\n'
+		prompt += '</agent_state>\n\n'
+
+		// <agent_history>
+		//  - <step_N> for steps
+		//  - <sys> for observations and system messages
+
+		prompt += '<agent_history>\n'
+
+		let stepIndex = 0
+		for (const event of this.history) {
+			if (event.type === 'step') {
+				stepIndex++
+				prompt += `<step_${stepIndex}>\n`
+				prompt += `Evaluation of Previous Step: ${event.reflection.evaluation_previous_goal}\n`
+				prompt += `Memory: ${event.reflection.memory}\n`
+				prompt += `Next Goal: ${event.reflection.next_goal}\n`
+				prompt += `Action Results: ${event.action.output}\n`
+				prompt += `</step_${stepIndex}>\n`
+			} else if (event.type === 'observation') {
+				prompt += `<sys>${event.content}</sys>\n`
+			} else if (event.type === 'user_takeover') {
+				prompt += `<sys>User took over control and made changes to the page</sys>\n`
+			} else if (event.type === 'error') {
+				// Error events are mainly for panel rendering, not included in LLM context
+				// to avoid polluting the agent's reasoning with transient errors
+			}
+		}
+
+		prompt += '</agent_history>\n\n'
+
+		// <browser_state>
+
+		let pageContent = browserState.content
+		if (this.config.transformPageContent) {
+			pageContent = await this.config.transformPageContent(pageContent)
+		}
+
+		prompt += '<browser_state>\n'
+		prompt += browserState.header + '\n'
+		prompt += pageContent + '\n'
+		prompt += browserState.footer + '\n\n'
+		prompt += '</browser_state>\n\n'
+
+		return prompt
+	}
+
+	#onDone(success = true) {
+		this.pageController.cleanUpHighlights()
+		this.pageController.hideMask() // No await - fire and forget
+		this.#setStatus(success ? 'completed' : 'error')
+		this.#abortController.abort()
+	}
+
+	dispose() {
+		console.log('Disposing PageAgent...')
+		this.disposed = true
+		this.pageController.dispose()
+		// this.history = []
+		this.#abortController.abort()
+
+		// Emit dispose event for UI cleanup
+		this.dispatchEvent(new Event('dispose'))
+
+		this.config.onDispose?.(this)
+	}
+}

packages/core/src/config/constants.ts

@@ -0,0 +1 @@
+export const DEFAULT_MAX_STEPS = 20

packages/core/src/config/index.ts

@@ -1,21 +1,30 @@
 import type { LLMConfig } from '@page-agent/llms'
 import type { PageControllerConfig } from '@page-agent/page-controller'
-import type { SupportedLanguage } from '@page-agent/ui'
 
-import type { ExecutionResult, HistoryEvent, PageAgent } from '../PageAgent'
+import type { PageAgentCore } from '../PageAgentCore'
 import type { PageAgentTool } from '../tools'
+import type { ExecutionResult, HistoricalEvent } from '../types'
 
 export type { LLMConfig }
 
+/** Supported UI languages */
+export type SupportedLanguage = 'en-US' | 'zh-CN'
+
 export interface AgentConfig {
 	// theme?: 'light' | 'dark'
 	language?: SupportedLanguage
 
+	/**
+	 * Maximum number of steps the agent can take per task.
+	 * @default 20
+	 */
+	maxSteps?: number
+
 	/**
 	 * Custom tools to extend PageAgent capabilities
 	 * @experimental
 	 * @note You can also override or remove internal tools by using the same name.
-	 * @see [tools](../tools/index.ts)
+	 * @see PageAgentTool
 	 *
 	 * @example
 	 * // override internal tool
@@ -60,21 +69,52 @@ export interface AgentConfig {
 		getPageInstructions?: (url: string) => string | undefined | null
 	}
 
-	// lifecycle hooks
-	// @todo: use event instead of hooks
-	// @todo: remove `this` binding, pass agent as explicit parameter instead
-
-	onBeforeStep?: (this: PageAgent, stepCnt: number) => Promise<void> | void
-	onAfterStep?: (this: PageAgent, stepCnt: number, history: HistoryEvent[]) => Promise<void> | void
-	onBeforeTask?: (this: PageAgent) => Promise<void> | void
-	onAfterTask?: (this: PageAgent, result: ExecutionResult) => Promise<void> | void
+	/**
+	 * Lifecycle hooks for task execution.
+	 * @experimental API may change in future versions.
+	 *
+	 * All hooks receive the agent instance as first parameter.
+	 */
 
 	/**
-	 * @note this hook can block the disposal process
-	 * @note when dispose caused by page unload, reason will be 'PAGE_UNLOADING'. this method CANNOT block unloading. async operations may be cut.
-	 * @todo remove `this` binding, pass agent as explicit parameter instead
+	 * Called before each step execution.
+	 * @experimental
+	 * @param agent - The PageAgentCore instance
+	 * @param stepCount - Current step number (0-indexed)
 	 */
-	onDispose?: (this: PageAgent, reason?: string) => void
+	onBeforeStep?: (agent: PageAgentCore, stepCount: number) => Promise<void> | void
+
+	/**
+	 * Called after each step execution.
+	 * @experimental
+	 * @param agent - The PageAgentCore instance
+	 * @param history - Current history of events
+	 */
+	onAfterStep?: (agent: PageAgentCore, history: HistoricalEvent[]) => Promise<void> | void
+
+	/**
+	 * Called before task execution starts.
+	 * @experimental
+	 * @param agent - The PageAgentCore instance
+	 */
+	onBeforeTask?: (agent: PageAgentCore) => Promise<void> | void
+
+	/**
+	 * Called after task execution completes (success or failure).
+	 * @experimental
+	 * @param agent - The PageAgentCore instance
+	 * @param result - The execution result
+	 */
+	onAfterTask?: (agent: PageAgentCore, result: ExecutionResult) => Promise<void> | void
+
+	/**
+	 * Called when the agent is disposed.
+	 * @experimental
+	 * @note This hook can block the disposal process if it's async.
+	 * @param agent - The PageAgentCore instance
+	 * @param reason - Optional reason for disposal
+	 */
+	onDispose?: (agent: PageAgentCore, reason?: string) => void
 
 	// page behavior hooks
 
@@ -103,19 +143,10 @@ export interface AgentConfig {
 	transformPageContent?: (content: string) => Promise<string> | string
 
 	/**
-	 * TODO: @unimplemented
-	 * hook when action causes a new page to be opened
-	 * @note PageAgent will try to detect new pages and decide if it's caused by an action. But not very reliable.
-	 * @todo remove `this` binding, pass agent as explicit parameter instead
+	 * Completely override the default system prompt.
+	 * @experimental Use with caution - incorrect prompts may break agent behavior.
 	 */
-	onNewPageOpen?: (this: PageAgent, url: string) => Promise<void> | void
-
-	/**
-	 * TODO: @unimplemented
-	 * try to navigate to a new page instead of opening a new tab/window.
-	 * @note will unload the current page when a action tries to open a new page. so that things keep in the same tab/window.
-	 */
-	experimentalPreventNewPage?: boolean
+	customSystemPrompt?: string
 }
 
 export type PageAgentConfig = LLMConfig & AgentConfig & PageControllerConfig

packages/core/src/env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="vite/client" />
+
+declare module '*.md?raw' {
+	const content: string
+	export default content
+}

packages/core/src/prompts/.prettierignore

@@ -0,0 +1 @@
+system_prompt.md

packages/core/src/prompts/system_prompt.md

@@ -10,7 +10,7 @@ You excel at following tasks:
 </intro>
 
 <language_settings>
-- Default working language: **中文**
+- Default working language: **English**
 - Use the language that user is using. Return in user's language.
 </language_settings>
 
@@ -92,7 +92,6 @@ Strictly follow these rules while using the browser and navigating the web:
 	- User can be wrong. If the request of user is not achievable, inappropriate or you do not have enough information or tools to achieve it. Tell user to make a better request.
 	- Webpage can be broken. All webpages or apps have bugs. Some bug will make it hard for your job. It's encouraged to tell user the problem of current page. Your feedbacks (including failing) are valuable for user.
 	- Trying to hard can be harmful. Repeating some action back and forth or pushing for a complex procedure with little knowledge can cause unwanted result and harmful side-effects. User would rather you to complete the task with a fail.
-- If you are not clear about the request or steps. `ask_user` to clarify it.
 - If you do not have knowledge for the current webpage or task. You must require user to give specific instructions and detailed steps.
 </capability>
 
@@ -120,7 +119,7 @@ Exhibit the following reasoning patterns to successfully achieve the <user_reque
 - Analyze all relevant items in <agent_history> and <browser_state> to understand your state.
 - Explicitly judge success/failure/uncertainty of the last action. Never assume an action succeeded just because it appears to be executed in your last step in <agent_history>. If the expected change is missing, mark the last action as failed (or uncertain) and plan a recovery.
 - Analyze whether you are stuck, e.g. when you repeat the same actions multiple times without any progress. Then consider alternative approaches e.g. scrolling for more context or ask user for help.
-- `ask_user` for help if you have any difficulty. Users want to be kept in the loop.
+- Ask user for help if you have any difficulty. Keep user in the loop.
 - If you see information relevant to <user_request>, plan saving the information to memory.
 - Always reason about the <user_request>. Make sure to carefully analyze the specific steps and information required. E.g. specific filters, specific form fields, specific information to search. Make sure to always compare the current trajectory with the user request and think carefully if thats how the user requested it.
 </reasoning_rules>
@@ -129,7 +128,6 @@ Exhibit the following reasoning patterns to successfully achieve the <user_reque
 Here are examples of good output patterns. Use them as reference but never copy them directly.
 
 <evaluation_examples>
-- Positive Examples:
 "evaluation_previous_goal": "Successfully navigated to the product page and found the target information. Verdict: Success"
 "evaluation_previous_goal": "Clicked the login button and user authentication form appeared. Verdict: Success"
 </evaluation_examples>
@@ -140,17 +138,16 @@ Here are examples of good output patterns. Use them as reference but never copy
 
 <next_goal_examples>
 "next_goal": "Click on the 'Add to Cart' button to proceed with the purchase flow."
-"next_goal": "Extract details from the first item on the page."
 </next_goal_examples>
 </examples>
 
 <output>
-You must ALWAYS respond with a valid JSON in this exact format:
-
 {
   "evaluation_previous_goal": "Concise one-sentence analysis of your last action. Clearly state success, failure, or uncertain.",
   "memory": "1-3 concise sentences of specific memory of this step and overall progress. You should put here everything that will help you track progress in future steps. Like counting pages visited, items found, etc.",
-  "next_goal": "State the next immediate goal and action to achieve it, in one clear sentence."
-  "action":{"one_action_name": {// action-specific parameter}}
+  "next_goal": "State the next immediate goal and action to achieve it, in one clear sentence.",
+  "action":{
+    "Action name": {// Action parameters}
+  }
 }
 </output>

packages/core/src/tools/index.ts

@@ -0,0 +1,189 @@
+/**
+ * Internal tools for PageAgent.
+ * @note Adapted from browser-use
+ */
+import * as z from 'zod'
+
+import type { PageAgentCore } from '../PageAgentCore'
+import { waitFor } from '../utils'
+
+/**
+ * Internal tool definition that has access to PageAgent `this` context
+ */
+export interface PageAgentTool<TParams = any> {
+	// name: string
+	description: string
+	inputSchema: z.ZodType<TParams>
+	execute: (this: PageAgentCore, args: TParams) => Promise<string>
+}
+
+export function tool<TParams>(options: PageAgentTool<TParams>): PageAgentTool<TParams> {
+	return options
+}
+
+/**
+ * Internal tools for PageAgent.
+ * Note: Using any to allow different parameter types for each tool
+ */
+export const tools = new Map<string, PageAgentTool>()
+
+tools.set(
+	'done',
+	tool({
+		description:
+			'Complete task. Text is your final response to the user — keep it concise unless the user explicitly asks for detail.',
+		inputSchema: z.object({
+			text: z.string(),
+			success: z.boolean().default(true),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			// @note main loop will handle this one
+			return Promise.resolve('Task completed')
+		},
+	})
+)
+
+tools.set(
+	'wait',
+	tool({
+		description: 'Wait for x seconds. Can be used to wait until the page or data is fully loaded.',
+		inputSchema: z.object({
+			seconds: z.number().min(1).max(10).default(1),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			// try to subtract LLM calling time from the actual wait time
+			const lastTimeUpdate = await this.pageController.getLastUpdateTime()
+			const actualWaitTime = Math.max(0, input.seconds - (Date.now() - lastTimeUpdate) / 1000)
+			console.log(`actualWaitTime: ${actualWaitTime} seconds`)
+			await waitFor(actualWaitTime)
+
+			return `✅ Waited for ${input.seconds} seconds.`
+		},
+	})
+)
+
+tools.set(
+	'ask_user',
+	tool({
+		description:
+			'Ask the user a question and wait for their answer. Use this if you need more information or clarification.',
+		inputSchema: z.object({
+			question: z.string(),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			if (!this.onAskUser) {
+				throw new Error('ask_user tool requires onAskUser callback to be set')
+			}
+			const answer = await this.onAskUser(input.question)
+			return `User answered: ${answer}`
+		},
+	})
+)
+
+tools.set(
+	'click_element_by_index',
+	tool({
+		description: 'Click element by index',
+		inputSchema: z.object({
+			index: z.int().min(0),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			const result = await this.pageController.clickElement(input.index)
+			return result.message
+		},
+	})
+)
+
+tools.set(
+	'input_text',
+	tool({
+		description: 'Click and type text into an interactive input element',
+		inputSchema: z.object({
+			index: z.int().min(0),
+			text: z.string(),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			const result = await this.pageController.inputText(input.index, input.text)
+			return result.message
+		},
+	})
+)
+
+tools.set(
+	'select_dropdown_option',
+	tool({
+		description:
+			'Select dropdown option for interactive element index by the text of the option you want to select',
+		inputSchema: z.object({
+			index: z.int().min(0),
+			text: z.string(),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			const result = await this.pageController.selectOption(input.index, input.text)
+			return result.message
+		},
+	})
+)
+
+/**
+ * @note Reference from browser-use
+ */
+tools.set(
+	'scroll',
+	tool({
+		description: 'Scroll the page vertically. Use index for scroll elements (dropdowns/custom UI).',
+		inputSchema: z.object({
+			down: z.boolean().default(true),
+			num_pages: z.number().min(0).max(10).optional().default(0.1),
+			pixels: z.number().int().min(0).optional(),
+			index: z.number().int().min(0).optional(),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			const result = await this.pageController.scroll({
+				...input,
+				numPages: input.num_pages,
+			})
+			return result.message
+		},
+	})
+)
+
+/**
+ * @todo Tables need a dedicated parser to extract structured data. This tool is useless.
+ */
+tools.set(
+	'scroll_horizontally',
+	tool({
+		description:
+			'Scroll the page horizontally, or within a specific element by index. Useful for wide tables.',
+		inputSchema: z.object({
+			right: z.boolean().default(true),
+			pixels: z.number().int().min(0),
+			index: z.number().int().min(0).optional(),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			const result = await this.pageController.scrollHorizontally(input)
+			return result.message
+		},
+	})
+)
+
+tools.set(
+	'execute_javascript',
+	tool({
+		description:
+			'Execute JavaScript code on the current page. Supports async/await syntax. Use with caution!',
+		inputSchema: z.object({
+			script: z.string(),
+		}),
+		execute: async function (this: PageAgentCore, input) {
+			const result = await this.pageController.executeJavascript(input.script)
+			return result.message
+		},
+	})
+)
+
+// @todo send_keys
+// @todo upload_file
+// @todo go_back
+// @todo extract_structured_data

packages/core/src/types.ts

@@ -0,0 +1,127 @@
+/**
+ * Agent reflection state - the reflection-before-action model
+ *
+ * Every tool call must first reflect on:
+ * - evaluation_previous_goal: How well did the previous action achieve its goal?
+ * - memory: Key information to remember for future steps
+ * - next_goal: What should be accomplished in the next action?
+ */
+export interface AgentReflection {
+	evaluation_previous_goal: string
+	memory: string
+	next_goal: string
+}
+
+/**
+ * MacroTool input structure
+ *
+ * This is the core abstraction that enforces the "reflection-before-action" mental model.
+ * Before executing any action, the LLM must output its reasoning state.
+ */
+export interface MacroToolInput extends Partial<AgentReflection> {
+	action: Record<string, any>
+}
+
+/**
+ * MacroTool output structure
+ */
+export interface MacroToolResult {
+	input: MacroToolInput
+	output: string
+}
+
+/**
+ * A single agent step with reflection and action
+ */
+export interface AgentStepEvent {
+	type: 'step'
+	stepIndex: number
+	reflection: Partial<AgentReflection>
+	action: {
+		name: string
+		input: any
+		output: string
+	}
+	usage: {
+		promptTokens: number
+		completionTokens: number
+		totalTokens: number
+		cachedTokens?: number
+		reasoningTokens?: number
+	}
+	/** Raw LLM response for debugging */
+	rawResponse?: unknown
+	/** Raw LLM request for debugging */
+	rawRequest?: unknown
+}
+
+/**
+ * Persistent observation event (stays in memory)
+ */
+export interface ObservationEvent {
+	type: 'observation'
+	content: string
+}
+
+/**
+ * User takeover event
+ */
+export interface UserTakeoverEvent {
+	type: 'user_takeover'
+}
+
+/**
+ * Retry event - LLM call is being retried
+ */
+export interface RetryEvent {
+	type: 'retry'
+	message: string
+	attempt: number
+	maxAttempts: number
+}
+
+/**
+ * Error event - fatal error from LLM or execution
+ */
+export interface AgentErrorEvent {
+	type: 'error'
+	message: string
+	rawResponse?: unknown
+}
+
+/**
+ * Union type for all history events
+ */
+export type HistoricalEvent =
+	| AgentStepEvent
+	| ObservationEvent
+	| UserTakeoverEvent
+	| RetryEvent
+	| AgentErrorEvent
+
+/**
+ * Agent execution status
+ */
+export type AgentStatus = 'idle' | 'running' | 'completed' | 'error'
+
+/**
+ * Agent activity - transient state for immediate UI feedback.
+ *
+ * Unlike historical events (which are persisted), activities are ephemeral
+ * and represent "what the agent is doing right now". UI components should
+ * listen to 'activity' events to show real-time feedback.
+ *
+ * Note: There is no 'idle' activity - absence of activity events means idle.
+ */
+export type AgentActivity =
+	| { type: 'thinking' }
+	| { type: 'executing'; tool: string; input: unknown }
+	| { type: 'executed'; tool: string; input: unknown; output: string; duration: number }
+	| { type: 'retrying'; attempt: number; maxAttempts: number }
+	| { type: 'error'; message: string }
+
+export interface ExecutionResult {
+	success: boolean
+	data: string
+	history: HistoricalEvent[]
+}

packages/core/src/utils/autoFixer.ts

@@ -1,4 +1,8 @@
+import { InvokeError, InvokeErrorType } from '@page-agent/llms'
 import chalk from 'chalk'
+import * as z from 'zod'
+
+import type { PageAgentTool } from '../tools'
 
 /**
  * Normalize LLM response and fix common format issues.
@@ -9,9 +13,10 @@ import chalk from 'chalk'
  * - Arguments wrapped as double JSON string
  * - Nested function call format
  * - Missing action field (fallback to wait)
+ * - Primitive action input for single-field tools (e.g. `{"click_element_by_index": 2}`)
  * - etc.
  */
-export function normalizeResponse(response: any): any {
+export function normalizeResponse(response: any, tools?: Map<string, PageAgentTool>): any {
 	let resolvedArguments = null as any
 
 	const choice = (response as { choices?: Choice[] }).choices?.[0]
@@ -78,6 +83,11 @@ export function normalizeResponse(response: any): any {
 		resolvedArguments.action = safeJsonParse(resolvedArguments.action)
 	}
 
+	// validate and fix action input using tool schemas
+	if (resolvedArguments.action && tools) {
+		resolvedArguments.action = validateAction(resolvedArguments.action, tools)
+	}
+
 	// fix incomplete formats
 	if (!resolvedArguments.action) {
 		console.log(chalk.yellow(`[normalizeResponse] #5: fixing tool_call`))
@@ -108,6 +118,55 @@ export function normalizeResponse(response: any): any {
 	}
 }
 
+/**
+ * Validate action against tool schemas. Provides clear error messages
+ * instead of letting the union schema produce unreadable errors.
+ *
+ * Also coerces primitive inputs for single-field tools:
+ * e.g. `{"click_element_by_index": 2}` → `{"click_element_by_index": {"index": 2}}`
+ */
+function validateAction(action: any, tools: Map<string, PageAgentTool>): any {
+	if (typeof action !== 'object' || action === null) return action
+
+	const toolName = Object.keys(action)[0]
+	if (!toolName) return action
+
+	const tool = tools.get(toolName)
+	if (!tool) {
+		const available = Array.from(tools.keys()).join(', ')
+		throw new InvokeError(
+			InvokeErrorType.INVALID_TOOL_ARGS,
+			`Unknown action "${toolName}". Available: ${available}`
+		)
+	}
+
+	let value = action[toolName]
+	const schema = tool.inputSchema
+
+	// coerce primitive input for single-field tools
+	if (schema instanceof z.ZodObject && value !== null && typeof value !== 'object') {
+		const requiredKey = Object.keys(schema.shape).find(
+			(k) => !(schema.shape as Record<string, z.ZodType>)[k].safeParse(undefined).success
+		)
+		if (requiredKey) {
+			console.log(
+				chalk.yellow(`[normalizeResponse] coercing primitive action input for "${toolName}"`)
+			)
+			value = { [requiredKey]: value }
+		}
+	}
+
+	const result = schema.safeParse(value)
+	if (!result.success) {
+		throw new InvokeError(
+			InvokeErrorType.INVALID_TOOL_ARGS,
+			`Invalid input for action "${toolName}": ${z.prettifyError(result.error)}`
+		)
+	}
+
+	return { [toolName]: result.data }
+}
+
 /**
  * Safely parse JSON, return original input if not json.
  */

packages/core/src/utils/index.ts

@@ -1,27 +1,7 @@
+import chalk from 'chalk'
+
 export { normalizeResponse } from './autoFixer'
 
-/**
- * Wait until condition becomes true
- * @returns Returns when condition becomes true, throws otherwise
- * @param timeout Timeout in milliseconds, default 0 means no timeout, throws error on timeout
- */
-export async function waitUntil(check: () => boolean, timeout = 60 * 60_1000): Promise<boolean> {
-	if (check()) return true
-
-	return new Promise((resolve, reject) => {
-		const start = Date.now()
-		const interval = setInterval(() => {
-			if (check()) {
-				clearInterval(interval)
-				resolve(true)
-			} else if (Date.now() - start > timeout) {
-				clearInterval(interval)
-				reject(new Error('Timeout waiting for condition to become true'))
-			}
-		}, 100)
-	})
-}
-
 export async function waitFor(seconds: number): Promise<void> {
 	await new Promise((resolve) => setTimeout(resolve, seconds * 1000))
 }
@@ -37,15 +17,6 @@ export function truncate(text: string, maxLength: number): string {
 
 //
 
-export function trimLines(text: string): string {
-	return text
-		.split('\n')
-		.map((line) => line.trim())
-		.join('\n')
-}
-
-//
-
 export function randomID(existingIDs?: string[]): string {
 	let id = Math.random().toString(36).substring(2, 11)
 
@@ -68,12 +39,13 @@ export function randomID(existingIDs?: string[]): string {
 }
 
 //
+const _global = globalThis as any
 
-if (!window.__PAGE_AGENT_IDS__) {
-	window.__PAGE_AGENT_IDS__ = []
+if (!_global.__PAGE_AGENT_IDS__) {
+	_global.__PAGE_AGENT_IDS__ = []
 }
 
-const ids = window.__PAGE_AGENT_IDS__
+const ids = _global.__PAGE_AGENT_IDS__
 
 /**
  * Generate a random ID.
@@ -84,3 +56,19 @@ export function uid() {
 	ids.push(id)
 	return id
 }
+
+/**
+ * Simple assertion function that throws an error if the condition is falsy
+ * @param condition - The condition to assert
+ * @param message - Optional error message
+ * @throws Error if condition is falsy
+ */
+export function assert(condition: unknown, message?: string, silent?: boolean): asserts condition {
+	if (!condition) {
+		const errorMessage = message ?? 'Assertion failed'
+
+		if (!silent) console.error(chalk.red(`❌ assert: ${errorMessage}`))
+
+		throw new Error(errorMessage)
+	}
+}

packages/core/tsconfig.dts.json

@@ -0,0 +1,9 @@
+{
+    "extends": "./tsconfig.json",
+    "compilerOptions": {
+        // @workaround DTS bug
+        // dts do not work with monorepo path mapping
+        // disable path mapping for it
+        "paths": {}
+    }
+}

packages/core/tsconfig.json

@@ -0,0 +1,22 @@
+{
+    "extends": "../../tsconfig.base.json",
+    "compilerOptions": {
+        "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.tsbuildinfo",
+        "noEmit": false,
+        "allowImportingTsExtensions": false,
+        "baseUrl": ".",
+        "outDir": "dist",
+        "paths": {
+            //
+            "@page-agent/llms": ["../llms/src/index.ts"],
+            "@page-agent/page-controller": ["../page-controller/src/PageController.ts"]
+        }
+    },
+    "include": ["**/*.ts"],
+    "exclude": ["dist", "node_modules"],
+    "references": [
+        //
+        { "path": "../llms" },
+        { "path": "../page-controller" }
+    ]
+}

packages/core/vite.config.js

@@ -0,0 +1,44 @@
+// @ts-check
+import { dirname, resolve } from 'path'
+import dts from 'unplugin-dts/vite'
+import { fileURLToPath } from 'url'
+import { defineConfig } from 'vite'
+import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+
+// ES Module for NPM Package
+export default defineConfig({
+	clearScreen: false,
+	plugins: [
+		dts({ tsconfigPath: './tsconfig.dts.json', bundleTypes: true }),
+		cssInjectedByJsPlugin({ relativeCSSInjection: true }),
+	],
+	publicDir: false,
+	esbuild: {
+		keepNames: true,
+	},
+	build: {
+		lib: {
+			entry: resolve(__dirname, 'src/PageAgentCore.ts'),
+			name: 'PageAgentCore',
+			fileName: 'page-agent-core',
+			formats: ['es'],
+		},
+		outDir: resolve(__dirname, 'dist', 'esm'),
+		rollupOptions: {
+			external: [
+				'chalk',
+				'zod',
+				// all the internal packages
+				/^@page-agent\//,
+			],
+		},
+		minify: false,
+		sourcemap: true,
+		cssCodeSplit: true,
+	},
+	define: {
+		'process.env.NODE_ENV': '"production"',
+	},
+})

packages/extension/.prettierignore

@@ -0,0 +1,2 @@
+.wxt
+src/components/ui

packages/extension/PRIVACY.md

@@ -0,0 +1,5 @@
+# Privacy Policy for Page Agent Extension
+
+This document has moved. Please see our full **[Terms of Use & Privacy](../../docs/terms-and-privacy.md)**.
+
+Online: https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md

packages/extension/components.json

@@ -0,0 +1,24 @@
+{
+    "$schema": "https://ui.shadcn.com/schema.json",
+    "style": "new-york",
+    "rsc": false,
+    "tsx": true,
+    "tailwind": {
+        "config": "",
+        "css": "src/assets/index.css",
+        "baseColor": "neutral",
+        "cssVariables": true,
+        "prefix": ""
+    },
+    "iconLibrary": "lucide",
+    "aliases": {
+        "components": "@/components",
+        "utils": "@/lib/utils",
+        "ui": "@/components/ui",
+        "lib": "@/lib",
+        "hooks": "@/lib/hooks"
+    },
+    "registries": {
+        "@magicui": "https://magicui.design/r/{name}.json"
+    }
+}

packages/extension/docs/description.txt

@@ -0,0 +1,30 @@
+AI-powered browser automation. Control web pages with natural language.
+
+Page Agent Ext — AI-Powered Browser Automation
+
+🌟 What is Page Agent Ext?
+
+Page Agent Ext brings AI-powered automation to your browser. Built on the open-source Page Agent framework, it lets you control web pages across multiple tabs using natural language — no scripting required.
+
+🌟 Key Features:
+
+- Natural Language Control — Command your browser in plain language, no code needed
+- Cross-Tab Automation — Seamlessly operate across multiple tabs and pages
+- Smart HTML Cleaning — Intelligently extracts and simplifies page structure for accurate AI understanding
+- Bring Your Own LLM — Use OpenAI, Anthropic, or any compatible API with full data control
+- Privacy-First — Zero data collection; all data flows directly to your chosen LLM provider
+- Open Source — MIT licensed, built on the Page Agent framework with full transparency
+
+🌟 How It Works & Privacy:
+
+Page Agent Ext performs DOM analysis locally in your browser. When you initiate a task, sanitized page structure is sent to the LLM API you configure. Your data is never collected or stored by us.
+
+- Your API Key — Configure your own LLM API (OpenAI, Anthropic, etc.). Data goes directly to your provider
+- Test API — A free test endpoint is available for evaluation; we recommend your own key for regular use
+
+Terms of Use & Privacy: https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md
+
+🌟 Open Source:
+
+This project is MIT licensed. Review the code, verify privacy claims, or extend it for your needs:
+https://github.com/alibaba/page-agent

packages/extension/docs/description_zh.txt

@@ -0,0 +1,30 @@
+AI 驱动的浏览器自动化助手，用自然语言控制网页。
+
+Page Agent Ext — AI 驱动的浏览器自动化助手
+
+🌟 什么是 Page Agent Ext？
+
+Page Agent Ext 为浏览器带来 AI 自动化能力。基于开源的 Page Agent 框架，你可以用自然语言跨标签页控制网页，无需编写任何脚本。
+
+🌟 核心特性：
+
+- 自然语言控制 — 用日常语言指挥浏览器，无需编程
+- 跨标签页操作 — 在多个标签页之间无缝切换和操控
+- HTML 智能清洗 — 智能提取和精简页面结构，让 AI 准确理解网页内容
+- 使用你自己的模型 — 支持 OpenAI、Anthropic 或任何兼容 API，数据完全自主可控
+- 隐私优先 — 零数据收集，所有数据直接发送到你配置的 LLM 服务商
+- 开源透明 — MIT 协议，基于 Page Agent 开源框架，代码完全公开
+
+🌟 工作原理与隐私：
+
+Page Agent Ext 在浏览器本地进行 DOM 分析。当你发起任务时，经清洗的页面结构会发送到你配置的 LLM API。我们不会收集或存储你的任何数据。
+
+- 你的 API Key — 配置你自己的 LLM API（OpenAI、Anthropic 等），数据直接发送到你的服务商
+- 测试 API — 提供免费测试端点供体验，日常使用建议配置自己的 Key
+
+使用条款与隐私：https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md
+
+🌟 开源项目：
+
+MIT 协议开源。查看源码、验证隐私承诺，或按需扩展：
+https://github.com/alibaba/page-agent

packages/extension/docs/extension_api.md

@@ -0,0 +1,226 @@
+# Page Agent Extension API
+
+Integrate the Page Agent extension into your web app and trigger multi-page browser tasks from page JavaScript.
+
+## Installation
+
+### 1. Install the browser extension
+
+Primary channel:
+
+- Chrome Web Store: https://chromewebstore.google.com/detail/page-agent-ext/akldabonmimlicnjlflnapfeklbfemhj
+
+Latest updates are often published earlier on:
+
+- GitHub Releases: https://github.com/alibaba/page-agent/releases
+
+### 2. Install type definitions (recommended)
+
+```bash
+npm install @page-agent/core --save-dev
+```
+
+### 3. Authorization (Token)
+
+The token allows your page JS to call the extension API (`window.PAGE_AGENT_EXT`) and execute multi-page tasks.
+
+Why token-based access is required:
+
+- The extension has broad browser permissions (page access, navigation, multi-tab control).
+- If abused, it can harm user privacy and security.
+- Users must explicitly provide the token only to applications they trust.
+
+Setup:
+
+1. Open the extension side panel and copy your auth token.
+2. Set the token in your page:
+
+```typescript
+localStorage.setItem('PageAgentExtUserAuthToken', 'your-token')
+```
+
+## Quick Start
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+// Wait for extension injection (up to 1 second)
+async function waitForExtension(timeout = 1000): Promise<boolean> {
+  const start = Date.now()
+  while (Date.now() - start < timeout) {
+    if (window.PAGE_AGENT_EXT) return true
+    await new Promise((r) => setTimeout(r, 100))
+  }
+  return false
+}
+
+// Usage
+if (await waitForExtension()) {
+  const result = await window.PAGE_AGENT_EXT!.execute('Click the login button', {
+    baseURL: 'https://api.openai.com/v1',
+    apiKey: 'your-api-key',
+    model: 'gpt-5.2',
+    onStatusChange: (status) => console.log('Status:', status),
+    onActivity: (activity) => console.log('Activity:', activity),
+  })
+  console.log('Result:', result)
+}
+```
+
+## Global API
+
+After token match, the extension injects APIs into `window`.
+
+### `window.PAGE_AGENT_EXT_VERSION`
+
+Extension version string (for capability checks before using the main API).
+
+### `window.PAGE_AGENT_EXT`
+
+Main namespace object.
+
+#### `PAGE_AGENT_EXT.execute(task, config)`
+
+Execute one agent task.
+
+Parameters:
+
+| Name | Type | Required | Description |
+| ---- | ---- | -------- | ----------- |
+| `task` | `string` | Yes | Task description |
+| `config` | `ExecuteConfig` | Yes | LLM settings, options, and callbacks |
+
+Returns: `Promise<ExecutionResult>`
+
+#### `PAGE_AGENT_EXT.stop()`
+
+Stop the current task.
+
+## Types
+
+Install `@page-agent/core` for complete types:
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+export interface ExecuteConfig {
+  baseURL: string
+  apiKey: string
+  model: string
+
+  // Include the initial tab where page JS starts. Default: true.
+  includeInitialTab?: boolean
+
+  onStatusChange?: (status: AgentStatus) => void
+  onActivity?: (activity: AgentActivity) => void
+  onHistoryUpdate?: (history: HistoricalEvent[]) => void
+}
+
+export type Execute = (task: string, config: ExecuteConfig) => Promise<ExecutionResult>
+```
+
+`AgentStatus`
+
+```typescript
+type AgentStatus = 'idle' | 'running' | 'completed' | 'error'
+```
+
+`AgentActivity`
+
+```typescript
+type AgentActivity =
+  | { type: 'thinking' }
+  | { type: 'executing'; tool: string; input: unknown }
+  | { type: 'executed'; tool: string; input: unknown; output: string; duration: number }
+  | { type: 'retrying'; attempt: number; maxAttempts: number }
+  | { type: 'error'; message: string }
+```
+
+`HistoricalEvent`
+
+```typescript
+type HistoricalEvent =
+  | { type: 'step'; stepIndex: number; reflection: AgentReflection; action: Action }
+  | { type: 'observation'; content: string }
+  | { type: 'user_takeover' }
+  | { type: 'retry'; message: string; attempt: number; maxAttempts: number }
+  | { type: 'error'; message: string; rawResponse?: unknown }
+```
+
+`ExecutionResult`
+
+```typescript
+interface ExecutionResult {
+  success: boolean
+  data: string
+  history: HistoricalEvent[]
+}
+```
+
+## Usage Examples
+
+### Basic Execution
+
+```typescript
+const result = await window.PAGE_AGENT_EXT!.execute(
+  'Fill in the email field with test@example.com and click Submit',
+  {
+    baseURL: 'https://api.openai.com/v1',
+    apiKey: process.env.OPENAI_API_KEY!,
+    model: 'gpt-5.2',
+    includeInitialTab: false, // Optional: exclude current tab
+    onStatusChange: (status) => console.log(status),
+    onActivity: (activity) => console.log(activity),
+  }
+)
+```
+
+### Stop the Current Task
+
+```typescript
+window.PAGE_AGENT_EXT!.stop()
+```
+
+## Window Type Declaration
+
+If you are not importing `@page-agent/core`, add:
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+interface ExecuteConfig {
+  baseURL: string
+  apiKey: string
+  model: string
+  includeInitialTab?: boolean
+  onStatusChange?: (status: AgentStatus) => void
+  onActivity?: (activity: AgentActivity) => void
+  onHistoryUpdate?: (history: HistoricalEvent[]) => void
+}
+
+declare global {
+  interface Window {
+    PAGE_AGENT_EXT_VERSION?: string
+    PAGE_AGENT_EXT?: {
+      version: string
+      execute: Execute
+      stop: () => void
+    }
+  }
+}
+```

packages/extension/package.json

@@ -0,0 +1,49 @@
+{
+    "name": "@page-agent/ext",
+    "private": true,
+    "version": "0.1.8",
+    "type": "module",
+    "scripts": {
+        "dev": "wxt",
+        "build:ext": "wxt build",
+        "zip": "wxt zip",
+        "postinstall": "wxt prepare"
+    },
+    "devDependencies": {
+        "@radix-ui/react-hover-card": "^1.1.15",
+        "@radix-ui/react-icons": "^1.3.2",
+        "@radix-ui/react-label": "^2.1.8",
+        "@radix-ui/react-separator": "^1.1.8",
+        "@radix-ui/react-slot": "^1.2.4",
+        "@radix-ui/react-switch": "^1.2.6",
+        "@radix-ui/react-tooltip": "^1.2.8",
+        "@types/chrome": "^0.1.37",
+        "@types/react": "^19.2.14",
+        "@types/react-dom": "^19.2.1",
+        "@wxt-dev/module-react": "^1.1.5",
+        "class-variance-authority": "^0.7.1",
+        "clsx": "^2.1.1",
+        "idb": "^8.0.3",
+        "lucide-react": "^0.575.0",
+        "motion": "^12.34.3",
+        "next-themes": "^0.4.6",
+        "react": "^19.2.4",
+        "react-dom": "^19.2.4",
+        "rough-notation": "^0.5.1",
+        "simple-icons": "^16.9.0",
+        "sonner": "^2.0.7",
+        "tailwind-merge": "^3.5.0",
+        "tailwindcss": "^4.1.14",
+        "tw-animate-css": "^1.4.0",
+        "wxt": "^0.20.18"
+    },
+    "dependencies": {
+        "@page-agent/core": "1.4.0",
+        "@page-agent/llms": "1.4.0",
+        "@page-agent/page-controller": "1.4.0",
+        "@page-agent/ui": "1.4.0",
+        "ai-motion": "^0.4.8",
+        "chalk": "^5.6.2",
+        "zod": "^4.3.5"
+    }
+}

packages/extension/public/_locales/en/messages.json

@@ -0,0 +1,11 @@
+{
+	"extName": {
+		"message": "Page Agent Ext"
+	},
+	"extDescription": {
+		"message": "AI-powered browser automation assistant. Control web pages with natural language."
+	},
+	"extActionTitle": {
+		"message": "Open Page Agent"
+	}
+}

packages/extension/public/_locales/zh_CN/messages.json

@@ -0,0 +1,11 @@
+{
+	"extName": {
+		"message": "Page Agent Ext"
+	},
+	"extDescription": {
+		"message": "AI 驱动的浏览器自动化助手，用自然语言控制网页。"
+	},
+	"extActionTitle": {
+		"message": "打开 Page Agent"
+	}
+}

packages/extension/src/agent/.prettierignore

@@ -0,0 +1 @@
+system_prompt.md

packages/extension/src/agent/MultiPageAgent.ts

@@ -0,0 +1,96 @@
+import { type PageAgentConfig, PageAgentCore } from '@page-agent/core'
+
+import { RemotePageController } from './RemotePageController'
+import { TabsController } from './TabsController'
+import SYSTEM_PROMPT from './system_prompt.md?raw'
+import { createTabTools } from './tabTools'
+
+/** Detect user language from browser settings */
+function detectLanguage(): 'en-US' | 'zh-CN' {
+	const lang = navigator.language || navigator.languages?.[0] || 'en-US'
+	return lang.startsWith('zh') ? 'zh-CN' : 'en-US'
+}
+
+/**
+ * MultiPageAgent
+ * - use with extension
+ * - can be used from a side panel or a content script
+ */
+export class MultiPageAgent extends PageAgentCore {
+	constructor(config: Omit<PageAgentConfig, 'pageController'> & { includeInitialTab?: boolean }) {
+		// multi page controller
+		const tabsController = new TabsController()
+		const pageController = new RemotePageController(tabsController)
+		const customTools = createTabTools(tabsController)
+
+		// system prompt - auto-detect language if not specified
+		const language = config.language ?? detectLanguage()
+		const targetLanguage = language === 'zh-CN' ? '中文' : 'English'
+		const systemPrompt = SYSTEM_PROMPT.replace(
+			/Default working language: \*\*.*?\*\*/,
+			`Default working language: **${targetLanguage}**`
+		)
+
+		// include initial tab for controlling
+		const includeInitialTab = config.includeInitialTab ?? true
+
+		/**
+		 * When the agent is in side-panel and user closed the side-panel.
+		 * There is no chance for isAgentRunning to be set false.
+		 * (unload event doesn't work well in side panel.)
+		 * (I'm trying not to use long-lived connection because the lifecycle of a sw is hard to predict.)
+		 * This heartbeat mechanism acts as a backup.
+		 */
+		let heartBeatInterval: null | number = null
+
+		super({
+			...config,
+			pageController: pageController as any,
+			customTools: customTools,
+			customSystemPrompt: systemPrompt,
+
+			onBeforeTask: async (agent) => {
+				await tabsController.init(agent.task, includeInitialTab)
+
+				heartBeatInterval = window.setInterval(() => {
+					chrome.storage.local.set({
+						agentHeartbeat: Date.now(),
+					})
+				}, 1_000)
+
+				await chrome.storage.local.set({
+					isAgentRunning: true,
+				})
+			},
+
+			onAfterTask: async () => {
+				if (heartBeatInterval) {
+					window.clearInterval(heartBeatInterval)
+					heartBeatInterval = null
+				}
+
+				await chrome.storage.local.set({
+					isAgentRunning: false,
+				})
+			},
+
+			onBeforeStep: async (agent) => {
+				// make sure the current tab is loaded before the step starts
+				await tabsController.waitUntilTabLoaded(tabsController.currentTabId!)
+			},
+
+			onDispose: () => {
+				if (heartBeatInterval) {
+					window.clearInterval(heartBeatInterval)
+					heartBeatInterval = null
+				}
+
+				chrome.storage.local.set({
+					isAgentRunning: false,
+				})
+
+				tabsController.dispose()
+			},
+		})
+	}
+}

packages/extension/src/agent/RemotePageController.background.ts

@@ -0,0 +1,44 @@
+/**
+ * background logics for RemotePageController
+ * - redirect messages from RemotePageController(Agent, extension pages) to ContentScript
+ */
+
+export function handlePageControlMessage(
+	message: { type: 'PAGE_CONTROL'; action: string; payload: any; targetTabId: number },
+	sender: chrome.runtime.MessageSender,
+	sendResponse: (response: unknown) => void
+): true | undefined {
+	const PREFIX = '[RemotePageController.background]'
+
+	function debug(...messages: any[]) {
+		console.debug(`\x1b[90m${PREFIX}\x1b[0m`, ...messages)
+	}
+
+	const { action, payload, targetTabId } = message
+
+	if (action === 'get_my_tab_id') {
+		debug('get_my_tab_id', sender.tab?.id)
+		sendResponse({ tabId: sender.tab?.id || null })
+		return
+	}
+
+	// proxy to content script
+	chrome.tabs
+		.sendMessage(targetTabId, {
+			type: 'PAGE_CONTROL',
+			action,
+			payload,
+		})
+		.then((result) => {
+			sendResponse(result)
+		})
+		.catch((error) => {
+			console.error(PREFIX, error)
+			sendResponse({
+				success: false,
+				error: error instanceof Error ? error.message : String(error),
+			})
+		})
+
+	return true // async response
+}

packages/extension/src/agent/RemotePageController.content.ts

@@ -0,0 +1,132 @@
+/**
+ * content script for RemotePageController
+ */
+import { PageController } from '@page-agent/page-controller'
+
+export function initPageController() {
+	let pageController: PageController | null = null
+	let intervalID: number | null = null
+
+	const myTabIdPromise = chrome.runtime
+		.sendMessage({ type: 'PAGE_CONTROL', action: 'get_my_tab_id' })
+		.then((response) => {
+			return (response as { tabId: number | null }).tabId
+		})
+		.catch((error) => {
+			console.error('[RemotePageController.ContentScript]: Failed to get my tab id', error)
+			return null
+		})
+
+	function getPC(): PageController {
+		if (!pageController) {
+			pageController = new PageController({ enableMask: false, viewportExpansion: 400 })
+		}
+		return pageController
+	}
+
+	intervalID = window.setInterval(async () => {
+		const agentHeartbeat = (await chrome.storage.local.get('agentHeartbeat')).agentHeartbeat
+		const now = Date.now()
+		const agentInTouch = typeof agentHeartbeat === 'number' && now - agentHeartbeat < 2_000
+
+		const isAgentRunning = (await chrome.storage.local.get('isAgentRunning')).isAgentRunning
+		const currentTabId = (await chrome.storage.local.get('currentTabId')).currentTabId
+
+		const shouldShowMask = isAgentRunning && agentInTouch && currentTabId === (await myTabIdPromise)
+
+		if (shouldShowMask) {
+			const pc = getPC()
+			pc.initMask()
+			await pc.showMask()
+		} else {
+			// await getPC().hideMask()
+			if (pageController) {
+				pageController.hideMask()
+				pageController.cleanUpHighlights()
+			}
+		}
+
+		if (!isAgentRunning && agentInTouch) {
+			if (pageController) {
+				pageController.dispose()
+				pageController = null
+			}
+		}
+	}, 500)
+
+	chrome.runtime.onMessage.addListener((message, sender, sendResponse): true | undefined => {
+		if (message.type !== 'PAGE_CONTROL') {
+			// sendResponse({
+			// 	success: false,
+			// 	error: `[RemotePageController.ContentScript]: Invalid message type: ${message.type}`,
+			// })
+			return
+		}
+
+		const { action, payload } = message
+		const methodName = getMethodName(action)
+
+		const pc = getPC() as any
+
+		switch (action) {
+			case 'get_last_update_time':
+			case 'get_browser_state':
+			case 'update_tree':
+			case 'clean_up_highlights':
+			case 'click_element':
+			case 'input_text':
+			case 'select_option':
+			case 'scroll':
+			case 'scroll_horizontally':
+			case 'execute_javascript':
+				pc[methodName](...(payload || []))
+					.then((result: any) => sendResponse(result))
+					.catch((error: any) =>
+						sendResponse({
+							success: false,
+							error: error instanceof Error ? error.message : String(error),
+						})
+					)
+				break
+
+			default:
+				sendResponse({
+					success: false,
+					error: `Unknown PAGE_CONTROL action: ${action}`,
+				})
+		}
+
+		return true
+	})
+}
+
+function getMethodName(action: string): string {
+	switch (action) {
+		case 'get_last_update_time':
+			return 'getLastUpdateTime' as const
+		case 'get_browser_state':
+			return 'getBrowserState' as const
+		case 'update_tree':
+			return 'updateTree' as const
+		case 'clean_up_highlights':
+			return 'cleanUpHighlights' as const
+
+		// DOM actions
+
+		case 'click_element':
+			return 'clickElement' as const
+		case 'input_text':
+			return 'inputText' as const
+		case 'select_option':
+			return 'selectOption' as const
+		case 'scroll':
+			return 'scroll' as const
+		case 'scroll_horizontally':
+			return 'scrollHorizontally' as const
+		case 'execute_javascript':
+			return 'executeJavascript' as const
+
+		default:
+			return action
+	}
+}

packages/extension/src/agent/RemotePageController.ts

@@ -0,0 +1,198 @@
+import type { BrowserState } from '@page-agent/page-controller'
+
+import type { TabsController } from './TabsController'
+
+const PREFIX = '[RemotePageController]'
+
+function debug(...messages: any[]) {
+	console.debug(`\x1b[90m${PREFIX}\x1b[0m`, ...messages)
+}
+
+function sendMessage(message: {
+	type: 'PAGE_CONTROL'
+	action: string
+	targetTabId: number
+	payload?: any
+}): Promise<any> {
+	return chrome.runtime.sendMessage(message).catch((error) => {
+		console.error(PREFIX, message.action, error)
+		return null
+	})
+}
+
+/**
+ * Agent side page controller.
+ * - live in the agent env (extension page or content script)
+ * - communicates with remote PageController via sw
+ */
+export class RemotePageController {
+	tabsController: TabsController
+
+	constructor(tabsController: TabsController) {
+		this.tabsController = tabsController
+	}
+
+	get currentTabId(): number | null {
+		return this.tabsController.currentTabId
+	}
+
+	private async getCurrentUrl(): Promise<string> {
+		if (!this.currentTabId) return ''
+		const { url } = await this.tabsController.getTabInfo(this.currentTabId)
+		return url || ''
+	}
+
+	private async getCurrentTitle(): Promise<string> {
+		if (!this.currentTabId) return ''
+		const { title } = await this.tabsController.getTabInfo(this.currentTabId)
+		return title || ''
+	}
+
+	async getLastUpdateTime(): Promise<number> {
+		if (!this.currentTabId) throw new Error('tabsController not initialized.')
+		return sendMessage({
+			type: 'PAGE_CONTROL',
+			action: 'get_last_update_time',
+			targetTabId: this.currentTabId,
+		})
+	}
+
+	async getBrowserState(): Promise<BrowserState> {
+		if (!this.currentTabId) throw new Error('tabsController not initialized.')
+
+		let browserState = {} as BrowserState
+		debug('getBrowserState', this.currentTabId)
+
+		const currentUrl = await this.getCurrentUrl()
+		const currentTitle = await this.getCurrentTitle()
+
+		if (!this.currentTabId || !isContentScriptAllowed(currentUrl)) {
+			browserState = {
+				url: currentUrl,
+				title: currentTitle,
+				header: '',
+				content: '(empty page. either current page is not readable or not loaded yet.)',
+				footer: '',
+			}
+		} else {
+			browserState = await sendMessage({
+				type: 'PAGE_CONTROL',
+				action: 'get_browser_state',
+				targetTabId: this.currentTabId,
+			})
+		}
+
+		const sum = await this.tabsController.summarizeTabs()
+		browserState.header = sum + '\n\n' + (browserState.header || '')
+
+		debug('getBrowserState: success', this.currentTabId, browserState)
+
+		return browserState
+	}
+
+	async updateTree(): Promise<void> {
+		if (!this.currentTabId || !isContentScriptAllowed(await this.getCurrentUrl())) {
+			return
+		}
+
+		await sendMessage({
+			type: 'PAGE_CONTROL',
+			action: 'update_tree',
+			targetTabId: this.currentTabId,
+		})
+	}
+
+	async cleanUpHighlights(): Promise<void> {
+		if (!this.currentTabId || !isContentScriptAllowed(await this.getCurrentUrl())) {
+			return
+		}
+
+		await sendMessage({
+			type: 'PAGE_CONTROL',
+			action: 'clean_up_highlights',
+			targetTabId: this.currentTabId,
+		})
+	}
+
+	async clickElement(...args: any[]): Promise<DomActionReturn> {
+		const res = await this.remoteCallDomAction('click_element', args)
+		// @note may cause page navigation, wait for 1 second to ensure the page loading started
+		await new Promise((resolve) => setTimeout(resolve, 1000))
+		return res
+	}
+
+	async inputText(...args: any[]): Promise<DomActionReturn> {
+		return this.remoteCallDomAction('input_text', args)
+	}
+
+	async selectOption(...args: any[]): Promise<DomActionReturn> {
+		return this.remoteCallDomAction('select_option', args)
+	}
+
+	async scroll(...args: any[]): Promise<DomActionReturn> {
+		return this.remoteCallDomAction('scroll', args)
+	}
+
+	async scrollHorizontally(...args: any[]): Promise<DomActionReturn> {
+		return this.remoteCallDomAction('scroll_horizontally', args)
+	}
+
+	async executeJavascript(...args: any[]): Promise<DomActionReturn> {
+		return this.remoteCallDomAction('execute_javascript', args)
+	}
+
+	/** @note Managed by content script via storage polling. */
+	async showMask(): Promise<void> {}
+	/** @note Managed by content script via storage polling. */
+	async hideMask(): Promise<void> {}
+	/** @note Managed by content script via storage polling. */
+	dispose(): void {}
+
+	private async remoteCallDomAction(action: string, payload: any[]): Promise<DomActionReturn> {
+		if (!this.currentTabId) {
+			return { success: false, message: 'RemotePageController not initialized.' }
+		}
+
+		if (!isContentScriptAllowed(await this.getCurrentUrl())) {
+			return {
+				success: false,
+				message:
+					'Operation not allowed on this page. Use open_new_tab to navigate to a web page first.',
+			}
+		}
+
+		return sendMessage({
+			type: 'PAGE_CONTROL',
+			action: action,
+			targetTabId: this.currentTabId!,
+			payload,
+		})
+	}
+}
+
+interface DomActionReturn {
+	success: boolean
+	message: string
+}
+
+/**
+ * Check if a URL can run content scripts.
+ */
+function isContentScriptAllowed(url: string | undefined): boolean {
+	if (!url) return false
+
+	const restrictedPatterns = [
+		/^chrome:\/\//,
+		/^chrome-extension:\/\//,
+		/^about:/,
+		/^edge:\/\//,
+		/^brave:\/\//,
+		/^opera:\/\//,
+		/^vivaldi:\/\//,
+		/^file:\/\//,
+		/^view-source:/,
+		/^devtools:\/\//,
+	]
+
+	return !restrictedPatterns.some((pattern) => pattern.test(url))
+}

packages/extension/src/agent/TabsController.background.ts

@@ -0,0 +1,160 @@
+/**
+ * background logics for TabsController
+ */
+import type { TabAction } from './TabsController'
+
+const PREFIX = '[TabsController.background]'
+
+function debug(...messages: any[]) {
+	console.debug(`\x1b[90m${PREFIX}\x1b[0m`, ...messages)
+}
+
+export function handleTabControlMessage(
+	message: { type: 'TAB_CONTROL'; action: TabAction; payload: any },
+	sender: chrome.runtime.MessageSender,
+	sendResponse: (response: unknown) => void
+): true | undefined {
+	const { action, payload } = message
+
+	switch (action as TabAction) {
+		case 'get_active_tab': {
+			debug('get_active_tab')
+			chrome.tabs
+				.query({ active: true, currentWindow: true })
+				.then((tabs) => {
+					const tabId = tabs.length > 0 ? tabs[0].id || null : null
+					debug('get_active_tab: success', tabId)
+					sendResponse({ success: true, tabId })
+				})
+				.catch((error) => {
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		case 'get_tab_info': {
+			debug('get_tab_info', payload)
+			chrome.tabs
+				.get(payload.tabId)
+				.then((tab) => {
+					debug('get_tab_info: success', tab)
+					sendResponse(tab)
+				})
+				.catch((error) => {
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		case 'open_new_tab': {
+			debug('open_new_tab', payload)
+			chrome.tabs
+				.create({ url: payload.url, active: false })
+				.then((newTab) => {
+					debug('open_new_tab: success', newTab)
+					sendResponse({ success: true, tabId: newTab.id, windowId: newTab.windowId })
+				})
+				.catch((error) => {
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		case 'create_tab_group': {
+			debug('create_tab_group', payload)
+			chrome.tabs
+				.group({ tabIds: payload.tabIds, createProperties: { windowId: payload.windowId } })
+				.then((groupId) => {
+					debug('create_tab_group: success', groupId)
+					sendResponse({ success: true, groupId })
+				})
+				.catch((error) => {
+					console.error(PREFIX, 'Failed to create tab group', error)
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		case 'update_tab_group': {
+			debug('update_tab_group', payload)
+			chrome.tabGroups
+				.update(payload.groupId, payload.properties)
+				.then(() => {
+					sendResponse({ success: true })
+				})
+				.catch((error) => {
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		case 'add_tab_to_group': {
+			debug('add_tab_to_group', payload)
+			chrome.tabs
+				.group({ tabIds: payload.tabId, groupId: payload.groupId })
+				.then(() => {
+					sendResponse({ success: true })
+				})
+				.catch((error) => {
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		case 'close_tab': {
+			debug('close_tab', payload)
+			chrome.tabs
+				.remove(payload.tabId)
+				.then(() => {
+					sendResponse({ success: true })
+				})
+				.catch((error) => {
+					sendResponse({ error: error instanceof Error ? error.message : String(error) })
+				})
+			return true // async response
+		}
+
+		default:
+			sendResponse({ error: `Unknown action: ${action}` })
+			return
+	}
+}
+
+export function setupTabChangeEvents() {
+	console.log('[TabsController.background] setupTabChangeEvents')
+
+	chrome.tabs.onCreated.addListener((tab) => {
+		debug('onCreated', tab)
+		chrome.runtime
+			.sendMessage({ type: 'TAB_CHANGE', action: 'created', payload: { tab } })
+			.catch((error) => {
+				debug('onCreated error:', error)
+			})
+	})
+
+	chrome.tabs.onRemoved.addListener((tabId, removeInfo) => {
+		debug('onRemoved', tabId, removeInfo)
+		chrome.runtime
+			.sendMessage({
+				type: 'TAB_CHANGE',
+				action: 'removed',
+				payload: { tabId, removeInfo },
+			})
+			.catch((error) => {
+				debug('onRemoved error:', error)
+			})
+	})
+
+	chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
+		debug('onUpdated', tabId, changeInfo)
+		chrome.runtime
+			.sendMessage({
+				type: 'TAB_CHANGE',
+				action: 'updated',
+				payload: { tabId, changeInfo, tab },
+			})
+			.catch((error) => {
+				debug('onUpdated error:', error)
+			})
+	})
+}

packages/extension/src/agent/TabsController.ts

@@ -0,0 +1,357 @@
+const PREFIX = '[TabsController]'
+
+function debug(...messages: any[]) {
+	console.debug(`\x1b[90m${PREFIX}\x1b[0m`, ...messages)
+}
+
+function sendMessage(message: {
+	type: 'TAB_CONTROL'
+	action: TabAction
+	payload?: any
+}): Promise<any> {
+	return chrome.runtime.sendMessage(message).catch((error) => {
+		console.error(PREFIX, message.action, error)
+		return null
+	})
+}
+
+/**
+ * Controller for managing browser tabs.
+ * - live in the agent env (extension page or content script)
+ * - no chrome apis. call sw for tab operations
+ */
+export class TabsController extends EventTarget {
+	currentTabId: number | null = null
+
+	private tabs: TabMeta[] = []
+	private initialTabId: number | null = null
+	private tabGroupId: number | null = null
+	private task: string = ''
+	private windowId: number | null = null
+
+	async init(task: string, includeInitialTab: boolean = true) {
+		debug('init', task, includeInitialTab)
+
+		this.task = task
+		this.tabs = []
+		this.currentTabId = null
+		this.tabGroupId = null
+		this.initialTabId = null
+		this.windowId = null
+
+		const result = await sendMessage({
+			type: 'TAB_CONTROL',
+			action: 'get_active_tab',
+		})
+
+		this.initialTabId = result.tabId
+
+		if (!this.initialTabId) {
+			throw new Error('Failed to get initial tab ID')
+		}
+
+		if (includeInitialTab) {
+			this.currentTabId = this.initialTabId
+
+			// update tab status immediately
+			const info = await sendMessage({
+				type: 'TAB_CONTROL',
+				action: 'get_tab_info',
+				payload: { tabId: this.initialTabId },
+			})
+
+			this.tabs.push({
+				id: result.tabId,
+				isInitial: true,
+				url: info.url,
+				title: info.title,
+				status: info.status,
+			})
+		}
+
+		await this.updateCurrentTabId(this.currentTabId)
+
+		const tabChangeHandler = (message: any): void => {
+			if (message.type !== 'TAB_CHANGE') {
+				// throw new Error(`[TabsController]: Invalid message type: ${message.type}`)
+				return
+			}
+
+			if (message.action === 'created') {
+				const tab = message.payload.tab as chrome.tabs.Tab
+				if (tab.groupId === this.tabGroupId && tab.id != null) {
+					// Tab created in our controlled group
+					if (!this.tabs.find((t) => t.id === tab.id)) {
+						this.tabs.push({ id: tab.id, isInitial: false })
+					}
+					this.switchToTab(tab.id)
+				}
+			} else if (message.action === 'removed') {
+				const { tabId } = message.payload as { tabId: number }
+				const targetTab = this.tabs.find((t) => t.id === tabId)
+				if (targetTab) {
+					this.tabs = this.tabs.filter((t) => t.id !== tabId)
+					if (this.currentTabId === tabId) {
+						const newCurrentTab = this.tabs[this.tabs.length - 1] || null
+						if (newCurrentTab) {
+							this.switchToTab(newCurrentTab.id)
+						} else {
+							this.updateCurrentTabId(null)
+						}
+					}
+				}
+			} else if (message.action === 'updated') {
+				const { tabId, tab } = message.payload as { tabId: number; tab: chrome.tabs.Tab }
+				const targetTab = this.tabs.find((t) => t.id === tabId)
+				if (targetTab) {
+					targetTab.url = tab.url
+					targetTab.title = tab.title
+					targetTab.status = tab.status
+				}
+			}
+		}
+
+		chrome.runtime.onMessage.addListener(tabChangeHandler)
+
+		this.addEventListener('dispose', () => {
+			chrome.runtime.onMessage.removeListener(tabChangeHandler)
+		})
+	}
+
+	async openNewTab(url: string): Promise<string> {
+		debug('openNewTab', url)
+
+		const result = await sendMessage({
+			type: 'TAB_CONTROL',
+			action: 'open_new_tab',
+			payload: { url },
+		})
+
+		if (!result.success) {
+			throw new Error(`Failed to open new tab: ${result.error}`)
+		}
+
+		const tabId = result.tabId as number
+		const windowId = result.windowId as number
+
+		this.windowId = windowId
+
+		this.tabs.push({
+			id: tabId,
+			isInitial: false,
+		})
+
+		await this.switchToTab(tabId)
+
+		if (!this.tabGroupId) {
+			const result = await sendMessage({
+				type: 'TAB_CONTROL',
+				action: 'create_tab_group',
+				payload: { tabIds: [tabId], windowId: this.windowId },
+			})
+
+			if (!result.success) {
+				throw new Error(`Failed to create tab group: ${result.error}`)
+			}
+
+			const groupId = result.groupId as number
+
+			this.tabGroupId = groupId
+
+			await sendMessage({
+				type: 'TAB_CONTROL',
+				action: 'update_tab_group',
+				payload: {
+					groupId: this.tabGroupId,
+					properties: {
+						title: `PageAgent(${this.task})`,
+						color: randomColor(),
+						collapsed: false,
+					},
+				},
+			})
+		} else {
+			await sendMessage({
+				type: 'TAB_CONTROL',
+				action: 'add_tab_to_group',
+				payload: { tabId: result.tabId, groupId: this.tabGroupId },
+			})
+		}
+
+		await this.waitUntilTabLoaded(tabId)
+
+		return `✅ Opened new tab ID ${tabId} with URL ${url}`
+	}
+
+	async switchToTab(tabId: number): Promise<string> {
+		debug('switchToTab', tabId)
+
+		const targetTab = this.tabs.find((t) => t.id === tabId)
+		if (!targetTab) {
+			throw new Error(`Tab ID ${tabId} not found in tab list.`)
+		}
+
+		await this.updateCurrentTabId(tabId)
+
+		return `✅ Switched to tab ID ${tabId}.`
+	}
+
+	async closeTab(tabId: number): Promise<string> {
+		debug('closeTab', tabId)
+
+		const targetTab = this.tabs.find((t) => t.id === tabId)
+		if (!targetTab) {
+			throw new Error(`Tab ID ${tabId} not found in tab list.`)
+		}
+		if (targetTab.isInitial) {
+			throw new Error(`Cannot close the initial tab ID ${tabId}.`)
+		}
+
+		const result = await sendMessage({
+			type: 'TAB_CONTROL',
+			action: 'close_tab',
+			payload: { tabId },
+		})
+
+		if (result.success) {
+			this.tabs = this.tabs.filter((t) => t.id !== tabId)
+			if (this.currentTabId === tabId) {
+				const newCurrentTab = this.tabs[this.tabs.length - 1] || null
+				if (newCurrentTab) {
+					await this.switchToTab(newCurrentTab.id)
+				} else {
+					await this.updateCurrentTabId(null)
+				}
+			}
+
+			return `✅ Closed tab ID ${tabId}.`
+		} else {
+			throw new Error(`Failed to close tab ID ${tabId}: ${result.error}`)
+		}
+	}
+
+	async updateCurrentTabId(tabId: number | null) {
+		debug('updateCurrentTabId', tabId)
+
+		this.currentTabId = tabId
+		await chrome.storage.local.set({ currentTabId: tabId })
+	}
+
+	async getTabInfo(tabId: number): Promise<{ title: string; url: string }> {
+		// use cached tab info if available
+		const tabMeta = this.tabs.find((t) => t.id === tabId)
+		if (tabMeta && tabMeta.url && tabMeta.title) {
+			return { title: tabMeta.title, url: tabMeta.url }
+		}
+
+		// otherwise, pull the latest tab info from the background script
+		debug('getTabInfo: pulling from background script', tabId)
+		const result = await sendMessage({
+			type: 'TAB_CONTROL',
+			action: 'get_tab_info',
+			payload: { tabId },
+		})
+
+		if (tabMeta) {
+			tabMeta.url = result.url
+			tabMeta.title = result.title
+		}
+
+		return result
+	}
+
+	async summarizeTabs(): Promise<string> {
+		const summaries = [`| Tab ID | URL | Title | Current |`, `|-----|-----|-----|-----|`]
+		for (const tab of this.tabs) {
+			const { title, url } = await this.getTabInfo(tab.id)
+			summaries.push(
+				`| ${tab.id} | ${url} | ${title} | ${this.currentTabId === tab.id ? '✅' : ''} |`
+			)
+		}
+		if (!this.tabs.length) {
+			summaries.push('\nNo tabs available. Open a tab if needed.')
+		}
+
+		return summaries.join('\n')
+	}
+
+	async waitUntilTabLoaded(tabId: number): Promise<void> {
+		const tab = this.tabs.find((t) => t.id === tabId)
+		if (!tab) throw new Error(`Tab ID ${tabId} not found in tab list.`)
+
+		if (tab.status === 'unloaded') throw new Error(`Tab ID ${tabId} is unloaded.`)
+		if (tab.status === 'complete') return
+
+		debug('waitUntilTabLoaded', tabId)
+		await waitUntil(() => tab.status === 'complete', 4_000)
+	}
+
+	dispose() {
+		this.dispatchEvent(new Event('dispose'))
+	}
+}
+
+export type TabAction =
+	| 'get_active_tab'
+	| 'get_tab_info'
+	| 'open_new_tab'
+	| 'create_tab_group'
+	| 'update_tab_group'
+	| 'add_tab_to_group'
+	| 'close_tab'
+	| 'get_tab_title'
+
+interface TabMeta {
+	id: number
+	isInitial: boolean
+	url?: string
+	title?: string
+	status?: 'loading' | 'unloaded' | 'complete'
+}
+
+const TAB_GROUP_COLORS = [
+	'grey',
+	'blue',
+	'red',
+	'yellow',
+	'green',
+	'pink',
+	'purple',
+	'cyan',
+] as const
+
+type TabGroupColor = (typeof TAB_GROUP_COLORS)[number]
+
+function randomColor(): TabGroupColor {
+	return TAB_GROUP_COLORS[Math.floor(Math.random() * TAB_GROUP_COLORS.length)]
+}
+
+/**
+ * Wait until condition becomes true
+ * @returns Returns when condition becomes true, throws otherwise
+ * @param timeoutMS Timeout in milliseconds, default 1 minutes, throws error on timeout
+ * @param error Error object to reject on timeout. If not provided, will resolve with false
+ */
+export async function waitUntil(
+	check: () => boolean | Promise<boolean>,
+	timeoutMS = 60_000,
+	error?: string
+): Promise<boolean> {
+	if (await check()) return true
+
+	return new Promise((resolve, reject) => {
+		const start = Date.now()
+		const poll = async () => {
+			if (await check()) return resolve(true)
+			if (Date.now() - start > timeoutMS) {
+				if (error) {
+					return reject(new Error(error))
+				} else {
+					return resolve(false)
+				}
+			}
+			setTimeout(poll, 100)
+		}
+		setTimeout(poll, 100)
+	})
+}

packages/extension/src/agent/constants.ts

@@ -0,0 +1,30 @@
+import type { LLMConfig } from '@page-agent/llms'
+
+// Demo LLM for testing
+export const DEMO_MODEL = 'qwen3.5-plus'
+export const DEMO_BASE_URL = 'https://page-ag-testing-ohftxirgbn.cn-shanghai.fcapp.run'
+export const DEMO_API_KEY = 'NA'
+
+export const DEMO_CONFIG: LLMConfig = {
+	apiKey: DEMO_API_KEY,
+	baseURL: DEMO_BASE_URL,
+	model: DEMO_MODEL,
+}
+
+/** Legacy testing endpoints that should be auto-migrated to DEMO_BASE_URL */
+export const LEGACY_TESTING_ENDPOINTS = [
+	'https://hwcxiuzfylggtcktqgij.supabase.co/functions/v1/llm-testing-proxy',
+]
+
+export function isTestingEndpoint(url: string): boolean {
+	const normalized = url.replace(/\/+$/, '')
+	return normalized === DEMO_BASE_URL || LEGACY_TESTING_ENDPOINTS.some((ep) => normalized === ep)
+}
+
+export function migrateLegacyEndpoint(config: LLMConfig): LLMConfig {
+	const normalized = config.baseURL.replace(/\/+$/, '')
+	if (LEGACY_TESTING_ENDPOINTS.some((ep) => normalized === ep)) {
+		return { ...DEMO_CONFIG }
+	}
+	return config
+}

packages/extension/src/agent/system_prompt.md

@@ -0,0 +1,145 @@
+You are an AI agent designed to operate in an iterative loop to automate browser tasks. Your ultimate goal is accomplishing the task provided in <user_request>.
+
+<intro>
+You excel at following tasks:
+1. Navigating complex websites and extracting precise information
+2. Automating form submissions and interactive web actions
+3. Gathering and saving information 
+4. Operate effectively in an agent loop
+5. Efficiently performing diverse web tasks
+</intro>
+
+<language_settings>
+- Default working language: **English**
+- Use the language that user is using. Return in user's language.
+</language_settings>
+
+<input>
+At every step, your input will consist of: 
+1. <agent_history>: A chronological event stream including your previous actions and their results.
+2. <agent_state>: Current <user_request> and <step_info>.
+3. <browser_state>: Tabs, Current Tab, Current URL, interactive elements indexed for actions, and visible page content.
+</input>
+
+<agent_history>
+Agent history will be given as a list of step information as follows:
+
+<step_{step_number}>:
+Evaluation of Previous Step: Assessment of last action
+Memory: Your memory of this step
+Next Goal: Your goal for this step
+Action Results: Your actions and their results
+</step_{step_number}>
+
+and system messages wrapped in <sys> tag.
+</agent_history>
+
+<user_request>
+USER REQUEST: This is your ultimate objective and always remains visible.
+- This has the highest priority. Make the user happy.
+- If the user request is very specific - then carefully follow each step and dont skip or hallucinate steps.
+- If the task is open ended you can plan yourself how to get it done.
+</user_request>
+
+<browser_state>
+1. Browser State will be given as:
+
+Open Tabs: Open tabs with their ids.
+Current Tab: The tab you are currently viewing.
+Current URL: URL of the page you are currently viewing.
+Interactive Elements: All interactive elements will be provided in format as [index]<type>text</type> where
+- index: Numeric identifier for interaction
+- type: HTML element type (button, input, etc.)
+- text: Element description
+
+Examples:
+[33]<div>User form</div>
+\t*[35]<button aria-label='Submit form'>Submit</button>
+
+Note that:
+- Only elements with numeric indexes in [] are interactive
+- (stacked) indentation (with \t) is important and means that the element is a (html) child of the element above (with a lower index)
+- Elements tagged with `*[` are the new clickable elements that appeared on the website since the last step - if url has not changed.
+- Pure text elements without [] are not interactive.
+</browser_state>
+
+<browser_rules>
+Strictly follow these rules while using the browser and navigating the web:
+- Only interact with elements that have a numeric [index] assigned.
+- Only use indexes that are explicitly provided.
+- If the page changes after, for example, an input text action, analyze if you need to interact with new elements, e.g. selecting the right option from the list.
+- By default, only elements in the visible viewport are listed. Use scrolling actions if you suspect relevant content is offscreen which you need to interact with. Scroll ONLY if there are more pixels below or above the page.
+- You can scroll by a specific number of pages using the num_pages parameter (e.g., 0.5 for half page, 2.0 for two pages).
+- All the elements that are scrollable are marked with `data-scrollable` attribute. Including the scrollable distance in every directions. You can scroll *the element* in case some area are overflowed.
+- If a captcha appears, tell user you can not solve captcha. finished the task and ask user to solve it.
+- If expected elements are missing, try scrolling, or navigating back.
+- If the page is not fully loaded, use the `wait` action.
+- Do not repeat one action for more than 3 times unless some conditions changed.
+- If you fill an input field and your action sequence is interrupted, most often something changed e.g. suggestions popped up under the field.
+- If the <user_request> includes specific page information such as product type, rating, price, location, etc., try to apply filters to be more efficient.
+- The <user_request> is the ultimate goal. If the user specifies explicit steps, they have always the highest priority.
+- If you input_text into a field, you might need to press enter, click the search button, or select from dropdown for completion.
+- Don't login into a page if you don't have to. Don't login if you don't have the credentials. 
+- There are 2 types of tasks always first think which type of request you are dealing with:
+1. Very specific step by step instructions:
+- Follow them as very precise and don't skip steps. Try to complete everything as requested.
+2. Open ended tasks. Plan yourself, be creative in achieving them.
+- If you get stuck e.g. with logins or captcha in open-ended tasks you can re-evaluate the task and try alternative ways, e.g. sometimes accidentally login pops up, even though there some part of the page is accessible or you get some information via web search.
+</browser_rules>
+
+<task_completion_rules>
+You must call the `done` action in one of three cases:
+- When you have fully completed the USER REQUEST.
+- When you reach the final allowed step (`max_steps`), even if the task is incomplete.
+- When you feel stuck or unable to solve user request. Or user request is not clear or contains inappropriate content.
+- When it is ABSOLUTELY IMPOSSIBLE to continue.
+
+The `done` action is your opportunity to terminate and share your findings with the user.
+- Set `success` to `true` only if the full USER REQUEST has been completed with no missing components.
+- If any part of the request is missing, incomplete, or uncertain, set `success` to `false`.
+- You can use the `text` field of the `done` action to communicate your findings and to provide a coherent reply to the user and fulfill the USER REQUEST.
+- You are ONLY ALLOWED to call `done` as a single action. Don't call it together with other actions.
+- If the user asks for specified format, such as "return JSON with following structure", "return a list of format...", MAKE sure to use the right format in your answer.
+- If the user asks for a structured output, your `done` action's schema may be modified. Take this schema into account when solving the task!
+</task_completion_rules>
+
+<reasoning_rules>
+Exhibit the following reasoning patterns to successfully achieve the <user_request>:
+
+- Reason about <agent_history> to track progress and context toward <user_request>.
+- Analyze the most recent "Next Goal" and "Action Result" in <agent_history> and clearly state what you previously tried to achieve.
+- Analyze all relevant items in <agent_history> and <browser_state> to understand your state.
+- Explicitly judge success/failure/uncertainty of the last action. Never assume an action succeeded just because it appears to be executed in your last step in <agent_history>. If the expected change is missing, mark the last action as failed (or uncertain) and plan a recovery.
+- Analyze whether you are stuck, e.g. when you repeat the same actions multiple times without any progress. Then consider alternative approaches e.g. scrolling for more context or ask user for help.
+- Ask user for help if you have any difficulty. Keep user in the loop.
+- If you see information relevant to <user_request>, plan saving the information to memory.
+- Always reason about the <user_request>. Make sure to carefully analyze the specific steps and information required. E.g. specific filters, specific form fields, specific information to search. Make sure to always compare the current trajectory with the user request and think carefully if thats how the user requested it.
+</reasoning_rules>
+
+<examples>
+Here are examples of good output patterns. Use them as reference but never copy them directly.
+
+<evaluation_examples>
+"evaluation_previous_goal": "Successfully navigated to the product page and found the target information. Verdict: Success"
+"evaluation_previous_goal": "Clicked the login button and user authentication form appeared. Verdict: Success"
+</evaluation_examples>
+
+<memory_examples>
+"memory": "Found many pending reports that need to be analyzed in the main page. Successfully processed the first 2 reports on quarterly sales data and moving on to inventory analysis and customer feedback reports."
+</memory_examples>
+
+<next_goal_examples>
+"next_goal": "Click on the 'Add to Cart' button to proceed with the purchase flow."
+</next_goal_examples>
+</examples>
+
+<output>
+{
+  "evaluation_previous_goal": "Concise one-sentence analysis of your last action. Clearly state success, failure, or uncertain.",
+  "memory": "1-3 concise sentences of specific memory of this step and overall progress. You should put here everything that will help you track progress in future steps. Like counting pages visited, items found, etc.",
+  "next_goal": "State the next immediate goal and action to achieve it, in one clear sentence.",
+  "action":{
+    "Action name": {// Action parameters}
+  }
+}
+</output>

packages/extension/src/agent/tabTools.ts

@@ -0,0 +1,74 @@
+/**
+ * Tab control tools for browser extension
+ *
+ * These tools allow the agent to manage multiple browser tabs:
+ * - open_new_tab: Open a new tab and set it as current
+ * - switch_to_tab: Switch to an existing tab
+ * - close_tab: Close a tab (optionally switch to another)
+ */
+import * as z from 'zod'
+
+import type { TabsController } from './TabsController'
+
+/** Tool definition compatible with PageAgentCore customTools */
+interface TabTool {
+	description: string
+	inputSchema: z.ZodType
+	execute: (input: unknown) => Promise<string>
+}
+
+/**
+ * Create tab control tools bound to a TabsManager instance.
+ * These tools are injected into PageAgentCore via customTools config.
+ */
+export function createTabTools(tabsController: TabsController): Record<string, TabTool> {
+	return {
+		open_new_tab: {
+			description:
+				'Open a new browser tab with the specified URL. The new tab becomes the current tab for all subsequent page operations.',
+			inputSchema: z.object({
+				url: z.string().describe('The URL to open in the new tab'),
+			}),
+			execute: async (input: unknown) => {
+				const { url } = input as { url: string }
+				try {
+					return await tabsController.openNewTab(url)
+				} catch (error) {
+					return `❌ Failed: ${error instanceof Error ? error.message : String(error)}`
+				}
+			},
+		},
+
+		switch_to_tab: {
+			description:
+				'Switch to an existing tab by its ID. After switching, all page operations will target the new current tab. You can only switch to tabs in the tab list shown in browser state.',
+			inputSchema: z.object({
+				tab_id: z.number().int().describe('The tab ID to switch to'),
+			}),
+			execute: async (input: unknown) => {
+				const { tab_id } = input as { tab_id: number }
+				try {
+					return await tabsController.switchToTab(tab_id)
+				} catch (error) {
+					return `❌ Failed: ${error instanceof Error ? error.message : String(error)}`
+				}
+			},
+		},
+
+		close_tab: {
+			description:
+				'Close a tab by its ID. Cannot close the initial tab. Optionally specify which tab to switch to after closing.',
+			inputSchema: z.object({
+				tab_id: z.number().int().describe('The tab ID to close'),
+			}),
+			execute: async (input: unknown) => {
+				const { tab_id } = input as { tab_id: number }
+				try {
+					return await tabsController.closeTab(tab_id)
+				} catch (error) {
+					return `❌ Failed: ${error instanceof Error ? error.message : String(error)}`
+				}
+			},
+		},
+	}
+}

packages/extension/src/agent/useAgent.ts

@@ -0,0 +1,129 @@
+/**
+ * React hook for using AgentController
+ */
+import type {
+	AgentActivity,
+	AgentStatus,
+	HistoricalEvent,
+	SupportedLanguage,
+} from '@page-agent/core'
+import type { LLMConfig } from '@page-agent/llms'
+import { useCallback, useEffect, useRef, useState } from 'react'
+
+import { MultiPageAgent } from './MultiPageAgent'
+import { DEMO_CONFIG, migrateLegacyEndpoint } from './constants'
+
+/** Language preference: undefined means follow system */
+export type LanguagePreference = SupportedLanguage | undefined
+
+export interface ExtConfig extends LLMConfig {
+	language?: LanguagePreference
+}
+
+export interface UseAgentResult {
+	status: AgentStatus
+	history: HistoricalEvent[]
+	activity: AgentActivity | null
+	currentTask: string
+	config: ExtConfig | null
+	execute: (task: string) => Promise<void>
+	stop: () => void
+	configure: (config: ExtConfig) => Promise<void>
+}
+
+export function useAgent(): UseAgentResult {
+	const agentRef = useRef<MultiPageAgent | null>(null)
+	const [status, setStatus] = useState<AgentStatus>('idle')
+	const [history, setHistory] = useState<HistoricalEvent[]>([])
+	const [activity, setActivity] = useState<AgentActivity | null>(null)
+	const [currentTask, setCurrentTask] = useState('')
+	const [config, setConfig] = useState<ExtConfig | null>(null)
+
+	useEffect(() => {
+		chrome.storage.local.get(['llmConfig', 'language']).then((result) => {
+			let llmConfig = (result.llmConfig as LLMConfig) ?? DEMO_CONFIG
+			const language = (result.language as SupportedLanguage) || undefined
+
+			// Auto-migrate legacy testing endpoints
+			const migrated = migrateLegacyEndpoint(llmConfig)
+			if (migrated !== llmConfig) {
+				llmConfig = migrated
+				chrome.storage.local.set({ llmConfig: migrated })
+			} else if (!result.llmConfig) {
+				chrome.storage.local.set({ llmConfig: DEMO_CONFIG })
+			}
+
+			setConfig({ ...llmConfig, language })
+		})
+	}, [])
+
+	useEffect(() => {
+		if (!config) return
+
+		const agent = new MultiPageAgent(config)
+		agentRef.current = agent
+
+		const handleStatusChange = (e: Event) => {
+			const newStatus = agent.status as AgentStatus
+			setStatus(newStatus)
+			if (newStatus === 'idle' || newStatus === 'completed' || newStatus === 'error') {
+				setActivity(null)
+			}
+		}
+
+		const handleHistoryChange = (e: Event) => {
+			setHistory([...agent.history])
+		}
+
+		const handleActivity = (e: Event) => {
+			const newActivity = (e as CustomEvent).detail as AgentActivity
+			setActivity(newActivity)
+		}
+
+		agent.addEventListener('statuschange', handleStatusChange)
+		agent.addEventListener('historychange', handleHistoryChange)
+		agent.addEventListener('activity', handleActivity)
+
+		return () => {
+			agent.removeEventListener('statuschange', handleStatusChange)
+			agent.removeEventListener('historychange', handleHistoryChange)
+			agent.removeEventListener('activity', handleActivity)
+			agent.dispose()
+		}
+	}, [config])
+
+	const execute = useCallback(async (task: string) => {
+		const agent = agentRef.current
+		console.log('🚀 [useAgent] start executing task:', task)
+		if (!agent) throw new Error('Agent not initialized')
+
+		setCurrentTask(task)
+		setHistory([])
+		await agent.execute(task)
+	}, [])
+
+	const stop = useCallback(() => {
+		agentRef.current?.stop()
+	}, [])
+
+	const configure = useCallback(async ({ language, ...llmConfig }: ExtConfig) => {
+		await chrome.storage.local.set({ llmConfig })
+		if (language) {
+			await chrome.storage.local.set({ language })
+		} else {
+			await chrome.storage.local.remove('language')
+		}
+		setConfig({ ...llmConfig, language })
+	}, [])
+
+	return {
+		status,
+		history,
+		activity,
+		currentTask,
+		config,
+		execute,
+		stop,
+		configure,
+	}
+}

packages/extension/src/assets/index.css

@@ -0,0 +1,158 @@
+@import 'tailwindcss';
+@import 'tw-animate-css';
+
+@custom-variant dark (&:is(.dark *));
+
+:root {
+	--background: oklch(1 0 0);
+	--foreground: oklch(0.145 0 0);
+	--card: oklch(1 0 0);
+	--card-foreground: oklch(0.145 0 0);
+	--popover: oklch(1 0 0);
+	--popover-foreground: oklch(0.145 0 0);
+	--primary: oklch(0.205 0 0);
+	--primary-foreground: oklch(0.985 0 0);
+	--secondary: oklch(0.97 0 0);
+	--secondary-foreground: oklch(0.205 0 0);
+	--muted: oklch(0.97 0 0);
+	--muted-foreground: oklch(0.556 0 0);
+	--accent: oklch(0.97 0 0);
+	--accent-foreground: oklch(0.205 0 0);
+	--destructive: oklch(0.577 0.245 27.325);
+	--destructive-foreground: oklch(0.577 0.245 27.325);
+	--border: oklch(0.922 0 0);
+	--input: oklch(0.922 0 0);
+	--ring: oklch(0.708 0 0);
+	--chart-1: oklch(0.646 0.222 41.116);
+	--chart-2: oklch(0.6 0.118 184.704);
+	--chart-3: oklch(0.398 0.07 227.392);
+	--chart-4: oklch(0.828 0.189 84.429);
+	--chart-5: oklch(0.769 0.188 70.08);
+	--radius: 0.625rem;
+	--sidebar: oklch(0.985 0 0);
+	--sidebar-foreground: oklch(0.145 0 0);
+	--sidebar-primary: oklch(0.205 0 0);
+	--sidebar-primary-foreground: oklch(0.985 0 0);
+	--sidebar-accent: oklch(0.97 0 0);
+	--sidebar-accent-foreground: oklch(0.205 0 0);
+	--sidebar-border: oklch(0.922 0 0);
+	--sidebar-ring: oklch(0.708 0 0);
+}
+
+.dark {
+	--background: oklch(0.19 0 0);
+	--foreground: oklch(0.985 0 0);
+	--card: oklch(0.145 0 0);
+	--card-foreground: oklch(0.985 0 0);
+	--popover: oklch(0.145 0 0);
+	--popover-foreground: oklch(0.985 0 0);
+	--primary: oklch(0.985 0 0);
+	--primary-foreground: oklch(0.205 0 0);
+	--secondary: oklch(0.269 0 0);
+	--secondary-foreground: oklch(0.985 0 0);
+	--muted: oklch(0.269 0 0);
+	--muted-foreground: oklch(0.708 0 0);
+	--accent: oklch(0.269 0 0);
+	--accent-foreground: oklch(0.985 0 0);
+	--destructive: oklch(0.396 0.141 25.723);
+	--destructive-foreground: oklch(0.637 0.237 25.331);
+	--border: oklch(0.269 0 0);
+	--input: oklch(0.269 0 0);
+	--ring: oklch(0.439 0 0);
+	--chart-1: oklch(0.488 0.243 264.376);
+	--chart-2: oklch(0.696 0.17 162.48);
+	--chart-3: oklch(0.769 0.188 70.08);
+	--chart-4: oklch(0.627 0.265 303.9);
+	--chart-5: oklch(0.645 0.246 16.439);
+	--sidebar: oklch(0.205 0 0);
+	--sidebar-foreground: oklch(0.985 0 0);
+	--sidebar-primary: oklch(0.488 0.243 264.376);
+	--sidebar-primary-foreground: oklch(0.985 0 0);
+	--sidebar-accent: oklch(0.269 0 0);
+	--sidebar-accent-foreground: oklch(0.985 0 0);
+	--sidebar-border: oklch(0.269 0 0);
+	--sidebar-ring: oklch(0.439 0 0);
+}
+
+@theme inline {
+	--color-background: var(--background);
+	--color-foreground: var(--foreground);
+	--color-card: var(--card);
+	--color-card-foreground: var(--card-foreground);
+	--color-popover: var(--popover);
+	--color-popover-foreground: var(--popover-foreground);
+	--color-primary: var(--primary);
+	--color-primary-foreground: var(--primary-foreground);
+	--color-secondary: var(--secondary);
+	--color-secondary-foreground: var(--secondary-foreground);
+	--color-muted: var(--muted);
+	--color-muted-foreground: var(--muted-foreground);
+	--color-accent: var(--accent);
+	--color-accent-foreground: var(--accent-foreground);
+	--color-destructive: var(--destructive);
+	--color-destructive-foreground: var(--destructive-foreground);
+	--color-border: var(--border);
+	--color-input: var(--input);
+	--color-ring: var(--ring);
+	--color-chart-1: var(--chart-1);
+	--color-chart-2: var(--chart-2);
+	--color-chart-3: var(--chart-3);
+	--color-chart-4: var(--chart-4);
+	--color-chart-5: var(--chart-5);
+	--radius-sm: calc(var(--radius) - 4px);
+	--radius-md: calc(var(--radius) - 2px);
+	--radius-lg: var(--radius);
+	--radius-xl: calc(var(--radius) + 4px);
+	--color-sidebar: var(--sidebar);
+	--color-sidebar-foreground: var(--sidebar-foreground);
+	--color-sidebar-primary: var(--sidebar-primary);
+	--color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+	--color-sidebar-accent: var(--sidebar-accent);
+	--color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+	--color-sidebar-border: var(--sidebar-border);
+	--color-sidebar-ring: var(--sidebar-ring);
+	--animate-blink-cursor: blink-cursor 1.2s step-end infinite;
+	@keyframes blink-cursor {
+		0%,
+		49% {
+			opacity: 1;
+		}
+		50%,
+		100% {
+			opacity: 0;
+		}
+	}
+}
+
+@keyframes glow-a {
+	0%,
+	100% {
+		opacity: 0.45;
+		transform: scale(1);
+	}
+	50% {
+		opacity: 0;
+		transform: scale(1.1);
+	}
+}
+
+@keyframes glow-b {
+	0%,
+	100% {
+		opacity: 0;
+		transform: scale(1.1);
+	}
+	50% {
+		opacity: 0.45;
+		transform: scale(1);
+	}
+}
+
+@layer base {
+	* {
+		@apply border-border outline-ring/50;
+	}
+	body {
+		@apply bg-background text-foreground;
+	}
+}

packages/extension/src/components/ui/button.tsx

@@ -0,0 +1,60 @@
+import { Slot } from '@radix-ui/react-slot'
+import { type VariantProps, cva } from 'class-variance-authority'
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+const buttonVariants = cva(
+	"inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+	{
+		variants: {
+			variant: {
+				default: 'bg-primary text-primary-foreground hover:bg-primary/90',
+				destructive:
+					'bg-destructive text-white hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60',
+				outline:
+					'border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50',
+				secondary: 'bg-secondary text-secondary-foreground hover:bg-secondary/80',
+				ghost: 'hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50',
+				link: 'text-primary underline-offset-4 hover:underline',
+			},
+			size: {
+				default: 'h-9 px-4 py-2 has-[>svg]:px-3',
+				sm: 'h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5',
+				lg: 'h-10 rounded-md px-6 has-[>svg]:px-4',
+				icon: 'size-9',
+				'icon-sm': 'size-8',
+				'icon-lg': 'size-10',
+			},
+		},
+		defaultVariants: {
+			variant: 'default',
+			size: 'default',
+		},
+	}
+)
+
+function Button({
+	className,
+	variant = 'default',
+	size = 'default',
+	asChild = false,
+	...props
+}: React.ComponentProps<'button'> &
+	VariantProps<typeof buttonVariants> & {
+		asChild?: boolean
+	}) {
+	const Comp = asChild ? Slot : 'button'
+
+	return (
+		<Comp
+			data-slot="button"
+			data-variant={variant}
+			data-size={size}
+			className={cn(buttonVariants({ variant, size, className }))}
+			{...props}
+		/>
+	)
+}
+
+export { Button, buttonVariants }

packages/extension/src/components/ui/card.tsx

@@ -0,0 +1,75 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Card({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="card"
+			className={cn(
+				'bg-card text-card-foreground flex flex-col gap-6 rounded-xl border py-6 shadow-sm',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function CardHeader({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="card-header"
+			className={cn(
+				'@container/card-header grid auto-rows-min grid-rows-[auto_auto] items-start gap-2 px-6 has-data-[slot=card-action]:grid-cols-[1fr_auto] [.border-b]:pb-6',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function CardTitle({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="card-title"
+			className={cn('leading-none font-semibold', className)}
+			{...props}
+		/>
+	)
+}
+
+function CardDescription({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="card-description"
+			className={cn('text-muted-foreground text-sm', className)}
+			{...props}
+		/>
+	)
+}
+
+function CardAction({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="card-action"
+			className={cn('col-start-2 row-span-2 row-start-1 self-start justify-self-end', className)}
+			{...props}
+		/>
+	)
+}
+
+function CardContent({ className, ...props }: React.ComponentProps<'div'>) {
+	return <div data-slot="card-content" className={cn('px-6', className)} {...props} />
+}
+
+function CardFooter({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="card-footer"
+			className={cn('flex items-center px-6 [.border-t]:pt-6', className)}
+			{...props}
+		/>
+	)
+}
+
+export { Card, CardHeader, CardFooter, CardTitle, CardAction, CardDescription, CardContent }

packages/extension/src/components/ui/field.tsx

@@ -0,0 +1,232 @@
+import { type VariantProps, cva } from 'class-variance-authority'
+import { useMemo } from 'react'
+
+import { Label } from '@/components/ui/label'
+import { Separator } from '@/components/ui/separator'
+import { cn } from '@/lib/utils'
+
+function FieldSet({ className, ...props }: React.ComponentProps<'fieldset'>) {
+	return (
+		<fieldset
+			data-slot="field-set"
+			className={cn(
+				'flex flex-col gap-6',
+				'has-[>[data-slot=checkbox-group]]:gap-3 has-[>[data-slot=radio-group]]:gap-3',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function FieldLegend({
+	className,
+	variant = 'legend',
+	...props
+}: React.ComponentProps<'legend'> & { variant?: 'legend' | 'label' }) {
+	return (
+		<legend
+			data-slot="field-legend"
+			data-variant={variant}
+			className={cn(
+				'mb-3 font-medium',
+				'data-[variant=legend]:text-base',
+				'data-[variant=label]:text-sm',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function FieldGroup({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="field-group"
+			className={cn(
+				'group/field-group @container/field-group flex w-full flex-col gap-7 data-[slot=checkbox-group]:gap-3 [&>[data-slot=field-group]]:gap-4',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+const fieldVariants = cva('group/field flex w-full gap-3 data-[invalid=true]:text-destructive', {
+	variants: {
+		orientation: {
+			vertical: ['flex-col [&>*]:w-full [&>.sr-only]:w-auto'],
+			horizontal: [
+				'flex-row items-center',
+				'[&>[data-slot=field-label]]:flex-auto',
+				'has-[>[data-slot=field-content]]:items-start has-[>[data-slot=field-content]]:[&>[role=checkbox],[role=radio]]:mt-px',
+			],
+			responsive: [
+				'flex-col [&>*]:w-full [&>.sr-only]:w-auto @md/field-group:flex-row @md/field-group:items-center @md/field-group:[&>*]:w-auto',
+				'@md/field-group:[&>[data-slot=field-label]]:flex-auto',
+				'@md/field-group:has-[>[data-slot=field-content]]:items-start @md/field-group:has-[>[data-slot=field-content]]:[&>[role=checkbox],[role=radio]]:mt-px',
+			],
+		},
+	},
+	defaultVariants: {
+		orientation: 'vertical',
+	},
+})
+
+function Field({
+	className,
+	orientation = 'vertical',
+	...props
+}: React.ComponentProps<'div'> & VariantProps<typeof fieldVariants>) {
+	return (
+		<div
+			role="group"
+			data-slot="field"
+			data-orientation={orientation}
+			className={cn(fieldVariants({ orientation }), className)}
+			{...props}
+		/>
+	)
+}
+
+function FieldContent({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="field-content"
+			className={cn('group/field-content flex flex-1 flex-col gap-1.5 leading-snug', className)}
+			{...props}
+		/>
+	)
+}
+
+function FieldLabel({ className, ...props }: React.ComponentProps<typeof Label>) {
+	return (
+		<Label
+			data-slot="field-label"
+			className={cn(
+				'group/field-label peer/field-label flex w-fit gap-2 leading-snug group-data-[disabled=true]/field:opacity-50',
+				'has-[>[data-slot=field]]:w-full has-[>[data-slot=field]]:flex-col has-[>[data-slot=field]]:rounded-md has-[>[data-slot=field]]:border [&>*]:data-[slot=field]:p-4',
+				'has-data-[state=checked]:bg-primary/5 has-data-[state=checked]:border-primary dark:has-data-[state=checked]:bg-primary/10',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function FieldTitle({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="field-label"
+			className={cn(
+				'flex w-fit items-center gap-2 text-sm leading-snug font-medium group-data-[disabled=true]/field:opacity-50',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function FieldDescription({ className, ...props }: React.ComponentProps<'p'>) {
+	return (
+		<p
+			data-slot="field-description"
+			className={cn(
+				'text-muted-foreground text-sm leading-normal font-normal group-has-[[data-orientation=horizontal]]/field:text-balance',
+				'last:mt-0 nth-last-2:-mt-1 [[data-variant=legend]+&]:-mt-1.5',
+				'[&>a:hover]:text-primary [&>a]:underline [&>a]:underline-offset-4',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function FieldSeparator({
+	children,
+	className,
+	...props
+}: React.ComponentProps<'div'> & {
+	children?: React.ReactNode
+}) {
+	return (
+		<div
+			data-slot="field-separator"
+			data-content={!!children}
+			className={cn(
+				'relative -my-2 h-5 text-sm group-data-[variant=outline]/field-group:-mb-2',
+				className
+			)}
+			{...props}
+		>
+			<Separator className="absolute inset-0 top-1/2" />
+			{children && (
+				<span
+					className="bg-background text-muted-foreground relative mx-auto block w-fit px-2"
+					data-slot="field-separator-content"
+				>
+					{children}
+				</span>
+			)}
+		</div>
+	)
+}
+
+function FieldError({
+	className,
+	children,
+	errors,
+	...props
+}: React.ComponentProps<'div'> & {
+	errors?: Array<{ message?: string } | undefined>
+}) {
+	const content = useMemo(() => {
+		if (children) {
+			return children
+		}
+
+		if (!errors?.length) {
+			return null
+		}
+
+		const uniqueErrors = [...new Map(errors.map((error) => [error?.message, error])).values()]
+
+		if (uniqueErrors?.length == 1) {
+			return uniqueErrors[0]?.message
+		}
+
+		return (
+			<ul className="ml-4 flex list-disc flex-col gap-1">
+				{uniqueErrors.map((error, index) => error?.message && <li key={index}>{error.message}</li>)}
+			</ul>
+		)
+	}, [children, errors])
+
+	if (!content) {
+		return null
+	}
+
+	return (
+		<div
+			role="alert"
+			data-slot="field-error"
+			className={cn('text-destructive text-sm font-normal', className)}
+			{...props}
+		>
+			{content}
+		</div>
+	)
+}
+
+export {
+	Field,
+	FieldLabel,
+	FieldDescription,
+	FieldError,
+	FieldGroup,
+	FieldLegend,
+	FieldSeparator,
+	FieldSet,
+	FieldContent,
+	FieldTitle,
+}

packages/extension/src/components/ui/hover-card.tsx

@@ -0,0 +1,36 @@
+import * as HoverCardPrimitive from '@radix-ui/react-hover-card'
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function HoverCard({ ...props }: React.ComponentProps<typeof HoverCardPrimitive.Root>) {
+	return <HoverCardPrimitive.Root data-slot="hover-card" {...props} />
+}
+
+function HoverCardTrigger({ ...props }: React.ComponentProps<typeof HoverCardPrimitive.Trigger>) {
+	return <HoverCardPrimitive.Trigger data-slot="hover-card-trigger" {...props} />
+}
+
+function HoverCardContent({
+	className,
+	align = 'center',
+	sideOffset = 4,
+	...props
+}: React.ComponentProps<typeof HoverCardPrimitive.Content>) {
+	return (
+		<HoverCardPrimitive.Portal data-slot="hover-card-portal">
+			<HoverCardPrimitive.Content
+				data-slot="hover-card-content"
+				align={align}
+				sideOffset={sideOffset}
+				className={cn(
+					'bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 z-50 w-64 origin-(--radix-hover-card-content-transform-origin) rounded-md border p-4 shadow-md outline-hidden',
+					className
+				)}
+				{...props}
+			/>
+		</HoverCardPrimitive.Portal>
+	)
+}
+
+export { HoverCard, HoverCardTrigger, HoverCardContent }

packages/extension/src/components/ui/input-group.tsx

@@ -0,0 +1,157 @@
+import { type VariantProps, cva } from 'class-variance-authority'
+import * as React from 'react'
+
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Textarea } from '@/components/ui/textarea'
+import { cn } from '@/lib/utils'
+
+function InputGroup({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="input-group"
+			role="group"
+			className={cn(
+				'group/input-group border-input dark:bg-input/30 relative flex w-full items-center rounded-md border shadow-xs transition-[color,box-shadow] outline-none',
+				'h-9 min-w-0 has-[>textarea]:h-auto',
+
+				// Variants based on alignment.
+				'has-[>[data-align=inline-start]]:[&>input]:pl-2',
+				'has-[>[data-align=inline-end]]:[&>input]:pr-2',
+				'has-[>[data-align=block-start]]:h-auto has-[>[data-align=block-start]]:flex-col has-[>[data-align=block-start]]:[&>input]:pb-3',
+				'has-[>[data-align=block-end]]:h-auto has-[>[data-align=block-end]]:flex-col has-[>[data-align=block-end]]:[&>input]:pt-3',
+
+				// Focus state — soft multi-color glow matching ai-motion palette
+				'has-[[data-slot=input-group-control]:focus-visible]:border-blue-400/60',
+				'has-[[data-slot=input-group-control]:focus-visible]:shadow-[0_0_0_1px_rgba(57,182,255,0.2),0_0_8px_rgba(57,182,255,0.15),0_0_16px_rgba(189,69,251,0.1)]',
+
+				// Error state.
+				'has-[[data-slot][aria-invalid=true]]:ring-destructive/20 has-[[data-slot][aria-invalid=true]]:border-destructive dark:has-[[data-slot][aria-invalid=true]]:ring-destructive/40',
+
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+const inputGroupAddonVariants = cva(
+	"text-muted-foreground flex h-auto cursor-text items-center justify-center gap-2 py-1.5 text-sm font-medium select-none [&>svg:not([class*='size-'])]:size-4 [&>kbd]:rounded-[calc(var(--radius)-5px)] group-data-[disabled=true]/input-group:opacity-50",
+	{
+		variants: {
+			align: {
+				'inline-start': 'order-first pl-3 has-[>button]:ml-[-0.45rem] has-[>kbd]:ml-[-0.35rem]',
+				'inline-end': 'order-last pr-3 has-[>button]:mr-[-0.45rem] has-[>kbd]:mr-[-0.35rem]',
+				'block-start':
+					'order-first w-full justify-start px-3 pt-3 [.border-b]:pb-3 group-has-[>input]/input-group:pt-2.5',
+				'block-end':
+					'order-last w-full justify-start px-3 pb-3 [.border-t]:pt-3 group-has-[>input]/input-group:pb-2.5',
+			},
+		},
+		defaultVariants: {
+			align: 'inline-start',
+		},
+	}
+)
+
+function InputGroupAddon({
+	className,
+	align = 'inline-start',
+	...props
+}: React.ComponentProps<'div'> & VariantProps<typeof inputGroupAddonVariants>) {
+	return (
+		<div
+			role="group"
+			data-slot="input-group-addon"
+			data-align={align}
+			className={cn(inputGroupAddonVariants({ align }), className)}
+			onClick={(e) => {
+				if ((e.target as HTMLElement).closest('button')) {
+					return
+				}
+				e.currentTarget.parentElement?.querySelector('input')?.focus()
+			}}
+			{...props}
+		/>
+	)
+}
+
+const inputGroupButtonVariants = cva('text-sm shadow-none flex gap-2 items-center', {
+	variants: {
+		size: {
+			xs: "h-6 gap-1 px-2 rounded-[calc(var(--radius)-5px)] [&>svg:not([class*='size-'])]:size-3.5 has-[>svg]:px-2",
+			sm: 'h-8 px-2.5 gap-1.5 rounded-md has-[>svg]:px-2.5',
+			'icon-xs': 'size-6 rounded-[calc(var(--radius)-5px)] p-0 has-[>svg]:p-0',
+			'icon-sm': 'size-8 p-0 has-[>svg]:p-0',
+		},
+	},
+	defaultVariants: {
+		size: 'xs',
+	},
+})
+
+function InputGroupButton({
+	className,
+	type = 'button',
+	variant = 'ghost',
+	size = 'xs',
+	...props
+}: Omit<React.ComponentProps<typeof Button>, 'size'> &
+	VariantProps<typeof inputGroupButtonVariants>) {
+	return (
+		<Button
+			type={type}
+			data-size={size}
+			variant={variant}
+			className={cn(inputGroupButtonVariants({ size }), className)}
+			{...props}
+		/>
+	)
+}
+
+function InputGroupText({ className, ...props }: React.ComponentProps<'span'>) {
+	return (
+		<span
+			className={cn(
+				"text-muted-foreground flex items-center gap-2 text-sm [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4",
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function InputGroupInput({ className, ...props }: React.ComponentProps<'input'>) {
+	return (
+		<Input
+			data-slot="input-group-control"
+			className={cn(
+				'flex-1 rounded-none border-0 bg-transparent shadow-none focus-visible:ring-0 dark:bg-transparent',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function InputGroupTextarea({ className, ...props }: React.ComponentProps<'textarea'>) {
+	return (
+		<Textarea
+			data-slot="input-group-control"
+			className={cn(
+				'flex-1 resize-none rounded-none border-0 bg-transparent py-3 shadow-none focus-visible:ring-0 dark:bg-transparent',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+export {
+	InputGroup,
+	InputGroupAddon,
+	InputGroupButton,
+	InputGroupText,
+	InputGroupInput,
+	InputGroupTextarea,
+}

packages/extension/src/components/ui/input.tsx

@@ -0,0 +1,21 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Input({ className, type, ...props }: React.ComponentProps<'input'>) {
+	return (
+		<input
+			type={type}
+			data-slot="input"
+			className={cn(
+				'file:text-foreground placeholder:text-muted-foreground selection:bg-primary selection:text-primary-foreground dark:bg-input/30 border-input h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 text-base shadow-xs transition-[color,box-shadow] outline-none file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm',
+				'focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]',
+				'aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+export { Input }

packages/extension/src/components/ui/item.tsx

@@ -0,0 +1,172 @@
+import { Slot } from '@radix-ui/react-slot'
+import { type VariantProps, cva } from 'class-variance-authority'
+import * as React from 'react'
+
+import { Separator } from '@/components/ui/separator'
+import { cn } from '@/lib/utils'
+
+function ItemGroup({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			role="list"
+			data-slot="item-group"
+			className={cn('group/item-group flex flex-col', className)}
+			{...props}
+		/>
+	)
+}
+
+function ItemSeparator({ className, ...props }: React.ComponentProps<typeof Separator>) {
+	return (
+		<Separator
+			data-slot="item-separator"
+			orientation="horizontal"
+			className={cn('my-0', className)}
+			{...props}
+		/>
+	)
+}
+
+const itemVariants = cva(
+	'group/item flex items-center border border-transparent text-sm rounded-md transition-colors [a]:hover:bg-accent/50 [a]:transition-colors duration-100 flex-wrap outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]',
+	{
+		variants: {
+			variant: {
+				default: 'bg-transparent',
+				outline: 'border-border',
+				muted: 'bg-muted/50',
+			},
+			size: {
+				default: 'p-4 gap-4 ',
+				sm: 'py-3 px-4 gap-2.5',
+			},
+		},
+		defaultVariants: {
+			variant: 'default',
+			size: 'default',
+		},
+	}
+)
+
+function Item({
+	className,
+	variant = 'default',
+	size = 'default',
+	asChild = false,
+	...props
+}: React.ComponentProps<'div'> & VariantProps<typeof itemVariants> & { asChild?: boolean }) {
+	const Comp = asChild ? Slot : 'div'
+	return (
+		<Comp
+			data-slot="item"
+			data-variant={variant}
+			data-size={size}
+			className={cn(itemVariants({ variant, size, className }))}
+			{...props}
+		/>
+	)
+}
+
+const itemMediaVariants = cva(
+	'flex shrink-0 items-center justify-center gap-2 group-has-[[data-slot=item-description]]/item:self-start [&_svg]:pointer-events-none group-has-[[data-slot=item-description]]/item:translate-y-0.5',
+	{
+		variants: {
+			variant: {
+				default: 'bg-transparent',
+				icon: "size-8 border rounded-sm bg-muted [&_svg:not([class*='size-'])]:size-4",
+				image: 'size-10 rounded-sm overflow-hidden [&_img]:size-full [&_img]:object-cover',
+			},
+		},
+		defaultVariants: {
+			variant: 'default',
+		},
+	}
+)
+
+function ItemMedia({
+	className,
+	variant = 'default',
+	...props
+}: React.ComponentProps<'div'> & VariantProps<typeof itemMediaVariants>) {
+	return (
+		<div
+			data-slot="item-media"
+			data-variant={variant}
+			className={cn(itemMediaVariants({ variant, className }))}
+			{...props}
+		/>
+	)
+}
+
+function ItemContent({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="item-content"
+			className={cn('flex flex-1 flex-col gap-1 [&+[data-slot=item-content]]:flex-none', className)}
+			{...props}
+		/>
+	)
+}
+
+function ItemTitle({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="item-title"
+			className={cn('flex w-fit items-center gap-2 text-sm leading-snug font-medium', className)}
+			{...props}
+		/>
+	)
+}
+
+function ItemDescription({ className, ...props }: React.ComponentProps<'p'>) {
+	return (
+		<p
+			data-slot="item-description"
+			className={cn(
+				'text-muted-foreground line-clamp-2 text-sm leading-normal font-normal text-balance',
+				'[&>a:hover]:text-primary [&>a]:underline [&>a]:underline-offset-4',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function ItemActions({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div data-slot="item-actions" className={cn('flex items-center gap-2', className)} {...props} />
+	)
+}
+
+function ItemHeader({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="item-header"
+			className={cn('flex basis-full items-center justify-between gap-2', className)}
+			{...props}
+		/>
+	)
+}
+
+function ItemFooter({ className, ...props }: React.ComponentProps<'div'>) {
+	return (
+		<div
+			data-slot="item-footer"
+			className={cn('flex basis-full items-center justify-between gap-2', className)}
+			{...props}
+		/>
+	)
+}
+
+export {
+	Item,
+	ItemMedia,
+	ItemContent,
+	ItemActions,
+	ItemGroup,
+	ItemSeparator,
+	ItemTitle,
+	ItemDescription,
+	ItemHeader,
+	ItemFooter,
+}

packages/extension/src/components/ui/label.tsx

@@ -0,0 +1,19 @@
+import * as LabelPrimitive from '@radix-ui/react-label'
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Label({ className, ...props }: React.ComponentProps<typeof LabelPrimitive.Root>) {
+	return (
+		<LabelPrimitive.Root
+			data-slot="label"
+			className={cn(
+				'flex items-center gap-2 text-sm leading-none font-medium select-none group-data-[disabled=true]:pointer-events-none group-data-[disabled=true]:opacity-50 peer-disabled:cursor-not-allowed peer-disabled:opacity-50',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+export { Label }

packages/extension/src/components/ui/separator.tsx

@@ -0,0 +1,26 @@
+import * as SeparatorPrimitive from '@radix-ui/react-separator'
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Separator({
+	className,
+	orientation = 'horizontal',
+	decorative = true,
+	...props
+}: React.ComponentProps<typeof SeparatorPrimitive.Root>) {
+	return (
+		<SeparatorPrimitive.Root
+			data-slot="separator"
+			decorative={decorative}
+			orientation={orientation}
+			className={cn(
+				'bg-border shrink-0 data-[orientation=horizontal]:h-px data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-px',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+export { Separator }

packages/extension/src/components/ui/sonner.tsx

@@ -0,0 +1,38 @@
+import {
+	CircleCheckIcon,
+	InfoIcon,
+	Loader2Icon,
+	OctagonXIcon,
+	TriangleAlertIcon,
+} from 'lucide-react'
+import { useTheme } from 'next-themes'
+import { Toaster as Sonner, type ToasterProps } from 'sonner'
+
+const Toaster = ({ ...props }: ToasterProps) => {
+	const { theme = 'system' } = useTheme()
+
+	return (
+		<Sonner
+			theme={theme as ToasterProps['theme']}
+			className="toaster group"
+			icons={{
+				success: <CircleCheckIcon className="size-4" />,
+				info: <InfoIcon className="size-4" />,
+				warning: <TriangleAlertIcon className="size-4" />,
+				error: <OctagonXIcon className="size-4" />,
+				loading: <Loader2Icon className="size-4 animate-spin" />,
+			}}
+			style={
+				{
+					'--normal-bg': 'var(--popover)',
+					'--normal-text': 'var(--popover-foreground)',
+					'--normal-border': 'var(--border)',
+					'--border-radius': 'var(--radius)',
+				} as React.CSSProperties
+			}
+			{...props}
+		/>
+	)
+}
+
+export { Toaster }

packages/extension/src/components/ui/spinner.tsx

@@ -0,0 +1,16 @@
+import { Loader2Icon } from 'lucide-react'
+
+import { cn } from '@/lib/utils'
+
+function Spinner({ className, ...props }: React.ComponentProps<'svg'>) {
+	return (
+		<Loader2Icon
+			role="status"
+			aria-label="Loading"
+			className={cn('size-4 animate-spin', className)}
+			{...props}
+		/>
+	)
+}
+
+export { Spinner }

packages/extension/src/components/ui/switch.tsx

@@ -0,0 +1,26 @@
+import * as SwitchPrimitive from '@radix-ui/react-switch'
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Switch({ className, ...props }: React.ComponentProps<typeof SwitchPrimitive.Root>) {
+	return (
+		<SwitchPrimitive.Root
+			data-slot="switch"
+			className={cn(
+				'peer data-[state=checked]:bg-primary data-[state=unchecked]:bg-input focus-visible:border-ring focus-visible:ring-ring/50 dark:data-[state=unchecked]:bg-input/80 inline-flex h-[1.15rem] w-8 shrink-0 items-center rounded-full border border-transparent shadow-xs transition-all outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50',
+				className
+			)}
+			{...props}
+		>
+			<SwitchPrimitive.Thumb
+				data-slot="switch-thumb"
+				className={cn(
+					'bg-background dark:data-[state=unchecked]:bg-foreground dark:data-[state=checked]:bg-primary-foreground pointer-events-none block size-4 rounded-full ring-0 transition-transform data-[state=checked]:translate-x-[calc(100%-2px)] data-[state=unchecked]:translate-x-0'
+				)}
+			/>
+		</SwitchPrimitive.Root>
+	)
+}
+
+export { Switch }

packages/extension/src/components/ui/textarea.tsx

@@ -0,0 +1,18 @@
+import * as React from 'react'
+
+import { cn } from '@/lib/utils'
+
+function Textarea({ className, ...props }: React.ComponentProps<'textarea'>) {
+	return (
+		<textarea
+			data-slot="textarea"
+			className={cn(
+				'border-input placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 flex field-sizing-content min-h-16 w-full rounded-md border bg-transparent px-3 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+export { Textarea }

packages/extension/src/components/ui/typing-animation.tsx

@@ -0,0 +1,164 @@
+import { MotionProps, motion, useInView } from 'motion/react'
+import { useEffect, useMemo, useRef, useState } from 'react'
+
+import { cn } from '@/lib/utils'
+
+interface TypingAnimationProps extends MotionProps {
+	children?: string
+	words?: string[]
+	className?: string
+	duration?: number
+	typeSpeed?: number
+	deleteSpeed?: number
+	delay?: number
+	pauseDelay?: number
+	loop?: boolean
+	as?: React.ElementType
+	startOnView?: boolean
+	showCursor?: boolean
+	blinkCursor?: boolean
+	cursorStyle?: 'line' | 'block' | 'underscore'
+}
+
+export function TypingAnimation({
+	children,
+	words,
+	className,
+	duration = 100,
+	typeSpeed,
+	deleteSpeed,
+	delay = 0,
+	pauseDelay = 1000,
+	loop = false,
+	as: Component = 'span',
+	startOnView = true,
+	showCursor = true,
+	blinkCursor = true,
+	cursorStyle = 'line',
+	...props
+}: TypingAnimationProps) {
+	const MotionComponent = motion.create(Component, {
+		forwardMotionProps: true,
+	})
+
+	const [displayedText, setDisplayedText] = useState<string>('')
+	const [currentWordIndex, setCurrentWordIndex] = useState(0)
+	const [currentCharIndex, setCurrentCharIndex] = useState(0)
+	const [phase, setPhase] = useState<'typing' | 'pause' | 'deleting'>('typing')
+	const elementRef = useRef<HTMLElement | null>(null)
+	const isInView = useInView(elementRef as React.RefObject<Element>, {
+		amount: 0.3,
+		once: true,
+	})
+
+	const wordsToAnimate = useMemo(() => words || (children ? [children] : []), [words, children])
+	const hasMultipleWords = wordsToAnimate.length > 1
+
+	const typingSpeed = typeSpeed || duration
+	const deletingSpeed = deleteSpeed || typingSpeed / 2
+
+	const shouldStart = startOnView ? isInView : true
+
+	useEffect(() => {
+		if (!shouldStart || wordsToAnimate.length === 0) return
+
+		const timeoutDelay =
+			delay > 0 && displayedText === ''
+				? delay
+				: phase === 'typing'
+					? typingSpeed
+					: phase === 'deleting'
+						? deletingSpeed
+						: pauseDelay
+
+		const timeout = setTimeout(() => {
+			const currentWord = wordsToAnimate[currentWordIndex] || ''
+			const graphemes = Array.from(currentWord)
+
+			switch (phase) {
+				case 'typing':
+					if (currentCharIndex < graphemes.length) {
+						setDisplayedText(graphemes.slice(0, currentCharIndex + 1).join(''))
+						setCurrentCharIndex(currentCharIndex + 1)
+					} else {
+						if (hasMultipleWords || loop) {
+							const isLastWord = currentWordIndex === wordsToAnimate.length - 1
+							if (!isLastWord || loop) {
+								setPhase('pause')
+							}
+						}
+					}
+					break
+
+				case 'pause':
+					setPhase('deleting')
+					break
+
+				case 'deleting':
+					if (currentCharIndex > 0) {
+						setDisplayedText(graphemes.slice(0, currentCharIndex - 1).join(''))
+						setCurrentCharIndex(currentCharIndex - 1)
+					} else {
+						const nextIndex = (currentWordIndex + 1) % wordsToAnimate.length
+						setCurrentWordIndex(nextIndex)
+						setPhase('typing')
+					}
+					break
+			}
+		}, timeoutDelay)
+
+		return () => clearTimeout(timeout)
+	}, [
+		shouldStart,
+		phase,
+		currentCharIndex,
+		currentWordIndex,
+		displayedText,
+		wordsToAnimate,
+		hasMultipleWords,
+		loop,
+		typingSpeed,
+		deletingSpeed,
+		pauseDelay,
+		delay,
+	])
+
+	const currentWordGraphemes = Array.from(wordsToAnimate[currentWordIndex] || '')
+	const isComplete =
+		!loop &&
+		currentWordIndex === wordsToAnimate.length - 1 &&
+		currentCharIndex >= currentWordGraphemes.length &&
+		phase !== 'deleting'
+
+	const shouldShowCursor =
+		showCursor &&
+		!isComplete &&
+		(hasMultipleWords || loop || currentCharIndex < currentWordGraphemes.length)
+
+	const getCursorChar = () => {
+		switch (cursorStyle) {
+			case 'block':
+				return '▌'
+			case 'underscore':
+				return '_'
+			case 'line':
+			default:
+				return '|'
+		}
+	}
+
+	return (
+		<MotionComponent
+			ref={elementRef}
+			className={cn('leading-[5rem] tracking-[-0.02em]', className)}
+			{...props}
+		>
+			{displayedText}
+			{shouldShowCursor && (
+				<span className={cn('inline-block', blinkCursor && 'animate-blink-cursor')}>
+					{getCursorChar()}
+				</span>
+			)}
+		</MotionComponent>
+	)
+}

packages/extension/src/entrypoints/background.ts

@@ -0,0 +1,36 @@
+import { handlePageControlMessage } from '@/agent/RemotePageController.background'
+import { handleTabControlMessage, setupTabChangeEvents } from '@/agent/TabsController.background'
+
+export default defineBackground(() => {
+	console.log('[Background] Service Worker started')
+
+	// tab change events
+
+	setupTabChangeEvents()
+
+	// generate user auth token
+
+	chrome.storage.local.get('PageAgentExtUserAuthToken').then((result) => {
+		if (result.PageAgentExtUserAuthToken) return
+
+		const userAuthToken = crypto.randomUUID()
+		chrome.storage.local.set({ PageAgentExtUserAuthToken: userAuthToken })
+	})
+
+	// message proxy
+
+	chrome.runtime.onMessage.addListener((message, sender, sendResponse): true | undefined => {
+		if (message.type === 'TAB_CONTROL') {
+			return handleTabControlMessage(message, sender, sendResponse)
+		} else if (message.type === 'PAGE_CONTROL') {
+			return handlePageControlMessage(message, sender, sendResponse)
+		} else {
+			sendResponse({ error: 'Unknown message type' })
+			return
+		}
+	})
+
+	// setup
+
+	chrome.sidePanel.setPanelBehavior({ openPanelOnActionClick: true }).catch(() => {})
+})

packages/extension/src/entrypoints/content.ts

@@ -0,0 +1,158 @@
+import { initPageController } from '@/agent/RemotePageController.content'
+
+// import { DEMO_CONFIG } from '@/agent/constants'
+
+const DEBUG_PREFIX = '[Content]'
+
+export default defineContentScript({
+	matches: ['<all_urls>'],
+	runAt: 'document_end',
+
+	main() {
+		console.debug(`${DEBUG_PREFIX} Loaded on ${window.location.href}`)
+		initPageController()
+
+		// if auth token matches, expose agent to page
+		chrome.storage.local.get('PageAgentExtUserAuthToken').then((result) => {
+			// extension side token.
+			// @note this is isolated world. it is safe to assume user script cannot access it
+			const extToken = result.PageAgentExtUserAuthToken
+			if (!extToken) return
+
+			// page side token
+			const pageToken = localStorage.getItem('PageAgentExtUserAuthToken')
+			if (!pageToken) return
+
+			if (pageToken !== extToken) return
+
+			console.log('[PageAgentExt]: Auth tokens match. Exposing agent to page.')
+
+			// add isolated world script
+			exposeAgentToPage().then(
+				// add main-world script
+				() => injectScript('/main-world.js')
+			)
+		})
+	},
+})
+
+async function exposeAgentToPage() {
+	const { MultiPageAgent } = await import('@/agent/MultiPageAgent')
+	console.log('[PageAgentExt]: MultiPageAgent loaded')
+
+	/**
+	 * singleton MultiPageAgent to handle requests from the page
+	 */
+	let multiPageAgent: InstanceType<typeof MultiPageAgent> | null = null
+
+	window.addEventListener('message', async (e) => {
+		const data = e.data
+		if (typeof data !== 'object' || data === null) return
+		if (data.channel !== 'PAGE_AGENT_EXT_REQUEST') return
+
+		const { action, payload, id } = data
+
+		switch (action) {
+			case 'execute': {
+				// singleton check
+				if (multiPageAgent && multiPageAgent.status === 'running') {
+					window.postMessage(
+						{
+							channel: 'PAGE_AGENT_EXT_RESPONSE',
+							id,
+							action: 'execute_result',
+							error: 'Agent is already running a task. Please wait until it finishes.',
+						},
+						'*'
+					)
+					return
+				}
+
+				try {
+					const { task, config } = payload
+
+					// Dispose old instance before creating new one
+					multiPageAgent?.dispose()
+
+					multiPageAgent = new MultiPageAgent(config)
+
+					// events
+
+					multiPageAgent.addEventListener('statuschange', (event) => {
+						if (!multiPageAgent) return
+						window.postMessage(
+							{
+								channel: 'PAGE_AGENT_EXT_RESPONSE',
+								id,
+								action: 'status_change_event',
+								payload: multiPageAgent.status,
+							},
+							'*'
+						)
+					})
+
+					multiPageAgent.addEventListener('activity', (event) => {
+						if (!multiPageAgent) return
+						window.postMessage(
+							{
+								channel: 'PAGE_AGENT_EXT_RESPONSE',
+								id,
+								action: 'activity_event',
+								payload: (event as CustomEvent).detail,
+							},
+							'*'
+						)
+					})
+
+					multiPageAgent.addEventListener('historychange', (event) => {
+						if (!multiPageAgent) return
+						window.postMessage(
+							{
+								channel: 'PAGE_AGENT_EXT_RESPONSE',
+								id,
+								action: 'history_change_event',
+								payload: multiPageAgent.history,
+							},
+							'*'
+						)
+					})
+
+					// result
+
+					const result = await multiPageAgent.execute(task)
+
+					window.postMessage(
+						{
+							channel: 'PAGE_AGENT_EXT_RESPONSE',
+							id,
+							action: 'execute_result',
+							payload: result,
+						},
+						'*'
+					)
+				} catch (error) {
+					window.postMessage(
+						{
+							channel: 'PAGE_AGENT_EXT_RESPONSE',
+							id,
+							action: 'execute_result',
+							error: (error as Error).message,
+						},
+						'*'
+					)
+				}
+
+				break
+			}
+
+			case 'stop': {
+				multiPageAgent?.stop()
+				break
+			}
+
+			default:
+				console.warn(`${DEBUG_PREFIX} Unknown action from page:`, action)
+				break
+		}
+	})
+}

packages/extension/src/entrypoints/main-world.ts

@@ -0,0 +1,119 @@
+import type { AgentActivity, AgentStatus, ExecutionResult, HistoricalEvent } from '@page-agent/core'
+
+export type Execute = (task: string, config: ExecuteConfig) => Promise<ExecutionResult>
+
+export interface ExecuteConfig {
+	baseURL: string
+	apiKey: string
+	model: string
+
+	/**
+	 * Whether to include the initial tab (that holds this main world script) in the task.
+	 * @default true
+	 */
+	includeInitialTab?: boolean
+
+	onStatusChange?: (status: AgentStatus) => void
+	onActivity?: (activity: AgentActivity) => void
+	onHistoryUpdate?: (history: HistoricalEvent[]) => void
+}
+
+export default defineUnlistedScript(() => {
+	let _lastId = 0
+	function getId() {
+		_lastId += 1
+		return _lastId
+	}
+
+	const execute: Execute = async (task, config) => {
+		if (typeof task !== 'string') throw new Error('Task must be a string')
+		if (task.trim().length === 0) throw new Error('Task cannot be empty')
+		if (!config) throw new Error('Config is required')
+		if (!config.baseURL) throw new Error('Config must have a baseURL')
+		if (!config.apiKey) throw new Error('Config must have an apiKey')
+		if (!config.model) throw new Error('Config must have a model')
+
+		const id = getId()
+
+		const promise = new Promise<ExecutionResult>((resolve, reject) => {
+			function handleMessage(e: MessageEvent) {
+				const data = e.data
+				if (typeof data !== 'object' || data === null) return
+				if (data.channel !== 'PAGE_AGENT_EXT_RESPONSE') return
+				if (data.id !== id) return
+
+				// events
+
+				if (data.action === 'status_change_event' && config.onStatusChange) {
+					config.onStatusChange(data.payload)
+					return
+				}
+
+				if (data.action === 'activity_event' && config.onActivity) {
+					config.onActivity(data.payload)
+					return
+				}
+
+				if (data.action === 'history_change_event' && config.onHistoryUpdate) {
+					config.onHistoryUpdate(data.payload)
+					return
+				}
+
+				if (data.action !== 'execute_result') return
+
+				// execute_result
+
+				window.removeEventListener('message', handleMessage)
+
+				if (data.error) {
+					reject(new Error(data.error))
+				} else {
+					resolve(data.payload)
+				}
+			}
+
+			// @note will be removed on dispose or result
+			window.addEventListener('message', handleMessage)
+		})
+
+		window.postMessage(
+			{
+				channel: 'PAGE_AGENT_EXT_REQUEST',
+				id,
+				action: 'execute',
+				payload: {
+					task,
+					config: {
+						baseURL: config.baseURL,
+						apiKey: config.apiKey,
+						model: config.model,
+						includeInitialTab: config.includeInitialTab,
+					},
+				},
+			},
+			'*'
+		)
+
+		return promise
+	}
+
+	const stop = () => {
+		const id = getId()
+
+		window.postMessage(
+			{
+				channel: 'PAGE_AGENT_EXT_REQUEST',
+				id,
+				action: 'stop',
+			},
+			'*'
+		)
+	}
+
+	;(window as any).PAGE_AGENT_EXT_VERSION = __EXT_VERSION__
+	;(window as any).PAGE_AGENT_EXT = {
+		version: __EXT_VERSION__,
+		execute,
+		stop,
+	}
+})

packages/extension/src/entrypoints/sidepanel/App.tsx

@@ -0,0 +1,213 @@
+import { History, Send, Settings, Square } from 'lucide-react'
+import { useCallback, useEffect, useRef, useState } from 'react'
+
+import { Button } from '@/components/ui/button'
+import {
+	InputGroup,
+	InputGroupAddon,
+	InputGroupButton,
+	InputGroupTextarea,
+} from '@/components/ui/input-group'
+import { saveSession } from '@/lib/db'
+
+import { useAgent } from '../../agent/useAgent'
+import { ConfigPanel } from './components/ConfigPanel'
+import { HistoryDetail } from './components/HistoryDetail'
+import { HistoryList } from './components/HistoryList'
+import { ActivityCard, EventCard } from './components/cards'
+import { EmptyState, Logo, MotionOverlay, StatusDot } from './components/misc'
+
+type View =
+	| { name: 'chat' }
+	| { name: 'config' }
+	| { name: 'history' }
+	| { name: 'history-detail'; sessionId: string }
+
+export default function App() {
+	const [view, setView] = useState<View>({ name: 'chat' })
+	const [inputValue, setInputValue] = useState('')
+	const historyRef = useRef<HTMLDivElement>(null)
+	const textareaRef = useRef<HTMLTextAreaElement>(null)
+
+	const { status, history, activity, currentTask, config, execute, stop, configure } = useAgent()
+
+	// Persist session when task finishes
+	const prevStatusRef = useRef(status)
+	useEffect(() => {
+		const prev = prevStatusRef.current
+		prevStatusRef.current = status
+
+		if (
+			prev === 'running' &&
+			(status === 'completed' || status === 'error') &&
+			history.length > 0 &&
+			currentTask
+		) {
+			saveSession({ task: currentTask, history, status }).catch((err) =>
+				console.error('[SidePanel] Failed to save session:', err)
+			)
+		}
+	}, [status, history, currentTask])
+
+	// Auto-scroll to bottom on new events
+	useEffect(() => {
+		if (historyRef.current) {
+			historyRef.current.scrollTop = historyRef.current.scrollHeight
+		}
+	}, [history, activity])
+
+	const handleSubmit = useCallback(
+		(e?: React.SyntheticEvent) => {
+			e?.preventDefault()
+			if (!inputValue.trim() || status === 'running') return
+
+			const taskToExecute = inputValue.trim()
+			setInputValue('')
+
+			execute(taskToExecute).catch((error) => {
+				console.error('[SidePanel] Failed to execute task:', error)
+			})
+		},
+		[inputValue, status, execute]
+	)
+
+	const handleStop = useCallback(() => {
+		console.log('[SidePanel] Stopping task...')
+		stop()
+	}, [stop])
+
+	const handleKeyDown = (e: React.KeyboardEvent) => {
+		if (e.key === 'Enter' && !e.shiftKey && !e.nativeEvent.isComposing) {
+			e.preventDefault()
+			handleSubmit()
+		}
+	}
+
+	// --- View routing ---
+
+	if (view.name === 'config') {
+		return (
+			<ConfigPanel
+				config={config}
+				onSave={async (newConfig) => {
+					await configure(newConfig)
+					setView({ name: 'chat' })
+				}}
+				onClose={() => setView({ name: 'chat' })}
+			/>
+		)
+	}
+
+	if (view.name === 'history') {
+		return (
+			<HistoryList
+				onSelect={(id) => setView({ name: 'history-detail', sessionId: id })}
+				onBack={() => setView({ name: 'chat' })}
+			/>
+		)
+	}
+
+	if (view.name === 'history-detail') {
+		return <HistoryDetail sessionId={view.sessionId} onBack={() => setView({ name: 'history' })} />
+	}
+
+	// --- Chat view ---
+
+	const isRunning = status === 'running'
+	const showEmptyState = !currentTask && history.length === 0 && !isRunning
+
+	return (
+		<div className="relative flex flex-col h-screen bg-background">
+			<MotionOverlay active={isRunning} />
+			{/* Header */}
+			<header className="flex items-center justify-between border-b px-3 py-2">
+				<div className="flex items-center gap-2">
+					<Logo className="size-5" />
+					<span className="text-sm font-medium">Page Agent Ext</span>
+				</div>
+				<div className="flex items-center gap-1">
+					<StatusDot status={status} />
+					<Button
+						variant="ghost"
+						size="icon-sm"
+						onClick={() => setView({ name: 'history' })}
+						className="cursor-pointer"
+					>
+						<History className="size-3.5" />
+					</Button>
+					<Button
+						variant="ghost"
+						size="icon-sm"
+						onClick={() => setView({ name: 'config' })}
+						className="cursor-pointer"
+					>
+						<Settings className="size-3.5" />
+					</Button>
+				</div>
+			</header>
+
+			{/* Content */}
+			<main className="flex-1 overflow-hidden flex flex-col">
+				{/* Current task */}
+				{currentTask && (
+					<div className="border-b px-3 py-2 bg-muted/30">
+						<div className="text-[10px] text-muted-foreground uppercase tracking-wide">Task</div>
+						<div className="text-xs font-medium truncate" title={currentTask}>
+							{currentTask}
+						</div>
+					</div>
+				)}
+
+				{/* History */}
+				<div ref={historyRef} className="flex-1 overflow-y-auto p-3 space-y-2">
+					{showEmptyState && <EmptyState />}
+
+					{history.map((event, index) => (
+						// eslint-disable-next-line react-x/no-array-index-key
+						<EventCard key={index} event={event} />
+					))}
+
+					{/* Activity indicator at bottom */}
+					{activity && <ActivityCard activity={activity} />}
+				</div>
+			</main>
+
+			{/* Input */}
+			<footer className="border-t p-3">
+				<InputGroup className="relative rounded-lg">
+					<InputGroupTextarea
+						ref={textareaRef}
+						placeholder="Describe your task... (Enter to send)"
+						value={inputValue}
+						onChange={(e) => setInputValue(e.target.value)}
+						onKeyDown={handleKeyDown}
+						disabled={isRunning}
+						className="text-xs pr-12 min-h-10"
+					/>
+					<InputGroupAddon align="inline-end" className="absolute bottom-0 right-0">
+						{isRunning ? (
+							<InputGroupButton
+								size="icon-sm"
+								variant="destructive"
+								onClick={handleStop}
+								className="size-7"
+							>
+								<Square className="size-3" />
+							</InputGroupButton>
+						) : (
+							<InputGroupButton
+								size="icon-sm"
+								variant="default"
+								onClick={() => handleSubmit()}
+								disabled={!inputValue.trim()}
+								className="size-7 cursor-pointer"
+							>
+								<Send className="size-3" />
+							</InputGroupButton>
+						)}
+					</InputGroupAddon>
+				</InputGroup>
+			</footer>
+		</div>
+	)
+}

packages/extension/src/entrypoints/sidepanel/components/ConfigPanel.tsx

@@ -0,0 +1,275 @@
+import { Copy, CornerUpLeft, Eye, EyeOff, HatGlasses, Home, Loader2, Scale } from 'lucide-react'
+import { useEffect, useState } from 'react'
+import { siGithub } from 'simple-icons'
+
+import { DEMO_API_KEY, DEMO_BASE_URL, DEMO_MODEL, isTestingEndpoint } from '@/agent/constants'
+import type { ExtConfig, LanguagePreference } from '@/agent/useAgent'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+
+interface ConfigPanelProps {
+	config: ExtConfig | null
+	onSave: (config: ExtConfig) => Promise<void>
+	onClose: () => void
+}
+
+export function ConfigPanel({ config, onSave, onClose }: ConfigPanelProps) {
+	const [apiKey, setApiKey] = useState(config?.apiKey || DEMO_API_KEY)
+	const [baseURL, setBaseURL] = useState(config?.baseURL || DEMO_BASE_URL)
+	const [model, setModel] = useState(config?.model || DEMO_MODEL)
+	const [language, setLanguage] = useState<LanguagePreference>(config?.language)
+	const [saving, setSaving] = useState(false)
+	const [userAuthToken, setUserAuthToken] = useState<string>('')
+	const [copied, setCopied] = useState(false)
+	const [showToken, setShowToken] = useState(false)
+	const [showApiKey, setShowApiKey] = useState(false)
+
+	// Update local state when config prop changes
+	useEffect(() => {
+		setApiKey(config?.apiKey || DEMO_API_KEY)
+		setBaseURL(config?.baseURL || DEMO_BASE_URL)
+		setModel(config?.model || DEMO_MODEL)
+		setLanguage(config?.language)
+	}, [config])
+
+	// Poll for user auth token every second until found
+	useEffect(() => {
+		let interval: NodeJS.Timeout | null = null
+
+		const fetchToken = async () => {
+			const result = await chrome.storage.local.get('PageAgentExtUserAuthToken')
+			const token = result.PageAgentExtUserAuthToken
+			if (typeof token === 'string' && token) {
+				setUserAuthToken(token)
+				if (interval) {
+					clearInterval(interval)
+					interval = null
+				}
+			}
+		}
+
+		fetchToken()
+		interval = setInterval(fetchToken, 1000)
+
+		return () => {
+			if (interval) clearInterval(interval)
+		}
+	}, [])
+
+	const handleCopyToken = async () => {
+		if (userAuthToken) {
+			await navigator.clipboard.writeText(userAuthToken)
+			setCopied(true)
+			setTimeout(() => setCopied(false), 2000)
+		}
+	}
+
+	const handleSave = async () => {
+		setSaving(true)
+		try {
+			await onSave({ apiKey, baseURL, model, language })
+		} finally {
+			setSaving(false)
+		}
+	}
+
+	return (
+		<div className="flex flex-col gap-4 p-4 relative">
+			<div className="flex items-center justify-between">
+				<h2 className="text-base font-semibold">Settings</h2>
+				<Button
+					variant="ghost"
+					size="icon-sm"
+					onClick={onClose}
+					className="absolute top-2 right-3 cursor-pointer"
+				>
+					<CornerUpLeft className="size-3.5" />
+				</Button>
+			</div>
+
+			{/* Testing API notice */}
+			{isTestingEndpoint(baseURL) && (
+				<div className="p-2.5 rounded-md border border-amber-500/30 bg-amber-500/5 text-[10px] text-muted-foreground leading-relaxed">
+					<Scale className="size-3 inline-block mr-1 -mt-0.5 text-amber-600" />
+					You are using the free testing API. By using this service you agree to the{' '}
+					<a
+						href="https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="underline hover:text-foreground"
+					>
+						Terms of Use & Privacy Policy
+					</a>
+					. No sensitive data. No guaranteed availability.
+				</div>
+			)}
+
+			{/* User Auth Token Section */}
+			<div className="flex flex-col gap-1.5 p-3 bg-muted/50 rounded-md border">
+				<label className="text-xs font-medium text-muted-foreground">User Auth Token</label>
+				<p className="text-[10px] text-muted-foreground mb-1">
+					Add this token to a website's localStorage to give it authorization to call this extension
+				</p>
+				<div className="flex gap-2 items-center">
+					<Input
+						readOnly
+						value={
+							userAuthToken
+								? showToken
+									? userAuthToken
+									: `${userAuthToken.slice(0, 4)}${'•'.repeat(userAuthToken.length - 8)}${userAuthToken.slice(-4)}`
+								: 'Loading...'
+						}
+						className="text-xs h-8 font-mono bg-background"
+					/>
+					<Button
+						variant="outline"
+						size="icon"
+						className="h-8 w-8 shrink-0 cursor-pointer"
+						onClick={() => setShowToken(!showToken)}
+						disabled={!userAuthToken}
+					>
+						{showToken ? <EyeOff className="size-3" /> : <Eye className="size-3" />}
+					</Button>
+					<Button
+						variant="outline"
+						size="icon"
+						className="h-8 w-8 shrink-0 cursor-pointer"
+						onClick={handleCopyToken}
+						disabled={!userAuthToken}
+					>
+						{copied ? <span className="">✓</span> : <Copy className="size-3" />}
+					</Button>
+				</div>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">Base URL</label>
+				<Input
+					placeholder="https://api.openai.com/v1"
+					value={baseURL}
+					onChange={(e) => setBaseURL(e.target.value)}
+					className="text-xs h-8"
+				/>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">Model</label>
+				<Input
+					placeholder="gpt-5.2"
+					value={model}
+					onChange={(e) => setModel(e.target.value)}
+					className="text-xs h-8"
+				/>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">API Key</label>
+				<div className="flex gap-2 items-center">
+					<Input
+						type={showApiKey ? 'text' : 'password'}
+						placeholder="sk-..."
+						value={apiKey}
+						onChange={(e) => setApiKey(e.target.value)}
+						className="text-xs h-8"
+					/>
+					<Button
+						variant="outline"
+						size="icon"
+						className="h-8 w-8 shrink-0 cursor-pointer"
+						onClick={() => setShowApiKey(!showApiKey)}
+					>
+						{showApiKey ? <EyeOff className="size-3" /> : <Eye className="size-3" />}
+					</Button>
+				</div>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">Language</label>
+				<select
+					value={language ?? ''}
+					onChange={(e) => setLanguage((e.target.value || undefined) as LanguagePreference)}
+					className="h-8 text-xs rounded-md border border-input bg-background px-2 cursor-pointer"
+				>
+					<option value="">System</option>
+					<option value="en-US">English</option>
+					<option value="zh-CN">中文</option>
+				</select>
+			</div>
+
+			<div className="flex gap-2 mt-2">
+				<Button variant="outline" onClick={onClose} className="flex-1 h-8 text-xs cursor-pointer">
+					Cancel
+				</Button>
+				<Button
+					onClick={handleSave}
+					disabled={saving}
+					className="flex-1 h-8 text-xs cursor-pointer"
+				>
+					{saving ? <Loader2 className="size-3 animate-spin" /> : 'Save'}
+				</Button>
+			</div>
+
+			{/* Footer */}
+			<div className="mt-4 mb-4 pt-4 border-t border-border/50 flex gap-2 justify-between text-[10px] text-muted-foreground">
+				<div className="flex flex-col justify-between">
+					<a
+						href="https://github.com/alibaba/page-agent"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="flex items-center gap-1 hover:text-foreground"
+					>
+						<svg role="img" viewBox="0 0 24 24" className="size-3 fill-current">
+							<path d={siGithub.path} />
+						</svg>
+						<span>Source Code</span>
+					</a>
+
+					<a
+						href="https://alibaba.github.io/page-agent/"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="flex items-center gap-1 hover:text-foreground"
+					>
+						<Home className="size-3" />
+						<span>Home Page</span>
+					</a>
+
+					<a
+						href="https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="flex items-center gap-1 hover:text-foreground"
+					>
+						<HatGlasses className="size-3" />
+						<span>Privacy Policy</span>
+					</a>
+				</div>
+
+				<div className="flex flex-col items-end">
+					<span>
+						Extension <span className="font-mono">v{__EXT_VERSION__}</span>
+					</span>
+					<span>
+						PageAgent <span className="font-mono">v{__CORE_VERSION__}</span>
+					</span>
+				</div>
+			</div>
+
+			{/* attribute */}
+			<div className="text-[10px] text-muted-foreground bg-background fixed bottom-0 w-full flex justify-around">
+				<span className="leading-loose">
+					Built with ♥️ by{' '}
+					<a
+						href="https://github.com/gaomeng1900"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="underline hover:text-foreground"
+					>
+						@Simon
+					</a>
+				</span>
+			</div>
+		</div>
+	)
+}

packages/extension/src/entrypoints/sidepanel/components/ErrorBoundary.tsx

@@ -0,0 +1,49 @@
+import { AlertTriangle, RotateCcw } from 'lucide-react'
+import { Component, type ErrorInfo, type ReactNode } from 'react'
+
+import { Button } from '@/components/ui/button'
+
+interface Props {
+	children: ReactNode
+}
+
+interface State {
+	hasError: boolean
+	error: Error | null
+}
+
+export class ErrorBoundary extends Component<Props, State> {
+	state: State = { hasError: false, error: null }
+
+	static getDerivedStateFromError(error: Error): State {
+		return { hasError: true, error }
+	}
+
+	componentDidCatch(error: Error, errorInfo: ErrorInfo) {
+		console.error('[ErrorBoundary]', error, errorInfo.componentStack)
+	}
+
+	handleReload = () => {
+		window.location.reload()
+	}
+
+	render() {
+		if (!this.state.hasError) {
+			return this.props.children
+		}
+
+		return (
+			<div className="flex flex-col items-center justify-center h-screen bg-background p-6 text-center">
+				<AlertTriangle className="size-12 text-destructive mb-4" />
+				<h2 className="text-lg font-semibold mb-2">Something went wrong</h2>
+				<p className="text-sm text-muted-foreground mb-4 max-w-xs">
+					{this.state.error?.message || 'An unexpected error occurred'}
+				</p>
+				<Button variant="outline" size="sm" onClick={this.handleReload}>
+					<RotateCcw className="size-3.5 mr-2" />
+					Reload Panel
+				</Button>
+			</div>
+		)
+	}
+}

packages/extension/src/entrypoints/sidepanel/components/HistoryDetail.tsx

@@ -0,0 +1,51 @@
+import { ArrowLeft } from 'lucide-react'
+import { useEffect, useState } from 'react'
+
+import { Button } from '@/components/ui/button'
+import { type SessionRecord, getSession } from '@/lib/db'
+
+import { EventCard } from './cards'
+
+export function HistoryDetail({ sessionId, onBack }: { sessionId: string; onBack: () => void }) {
+	const [session, setSession] = useState<SessionRecord | null>(null)
+
+	useEffect(() => {
+		getSession(sessionId).then((s) => setSession(s ?? null))
+	}, [sessionId])
+
+	if (!session) {
+		return (
+			<div className="flex items-center justify-center h-screen text-xs text-muted-foreground">
+				Loading...
+			</div>
+		)
+	}
+
+	return (
+		<div className="flex flex-col h-screen bg-background">
+			{/* Header */}
+			<header className="flex items-center gap-2 border-b px-3 py-2">
+				<Button variant="ghost" size="icon-sm" onClick={onBack} className="cursor-pointer">
+					<ArrowLeft className="size-3.5" />
+				</Button>
+				<span className="text-sm font-medium truncate">History</span>
+			</header>
+
+			{/* Task */}
+			<div className="border-b px-3 py-2 bg-muted/30">
+				<div className="text-[10px] text-muted-foreground uppercase tracking-wide">Task</div>
+				<div className="text-xs font-medium" title={session.task}>
+					{session.task}
+				</div>
+			</div>
+
+			{/* Events (read-only) */}
+			<div className="flex-1 overflow-y-auto p-3 space-y-2">
+				{session.history.map((event, index) => (
+					// eslint-disable-next-line react-x/no-array-index-key
+					<EventCard key={index} event={event} />
+				))}
+			</div>
+		</div>
+	)
+}

packages/extension/src/entrypoints/sidepanel/components/HistoryList.tsx

@@ -0,0 +1,119 @@
+import { ArrowLeft, CheckCircle, Trash2, XCircle } from 'lucide-react'
+import { useCallback, useEffect, useState } from 'react'
+
+import { Button } from '@/components/ui/button'
+import { type SessionRecord, clearSessions, deleteSession, listSessions } from '@/lib/db'
+
+function timeAgo(ts: number): string {
+	const seconds = Math.floor((Date.now() - ts) / 1000)
+	if (seconds < 60) return 'just now'
+	const minutes = Math.floor(seconds / 60)
+	if (minutes < 60) return `${minutes}m ago`
+	const hours = Math.floor(minutes / 60)
+	if (hours < 24) return `${hours}h ago`
+	const days = Math.floor(hours / 24)
+	return `${days}d ago`
+}
+
+export function HistoryList({
+	onSelect,
+	onBack,
+}: {
+	onSelect: (id: string) => void
+	onBack: () => void
+}) {
+	const [sessions, setSessions] = useState<SessionRecord[]>([])
+	const [loading, setLoading] = useState(true)
+
+	const load = useCallback(async () => {
+		setSessions(await listSessions())
+		setLoading(false)
+	}, [])
+
+	useEffect(() => {
+		// eslint-disable-next-line react-hooks/set-state-in-effect
+		load()
+	}, [load])
+
+	const handleDelete = async (e: React.MouseEvent, id: string) => {
+		e.stopPropagation()
+		await deleteSession(id)
+		setSessions((prev) => prev.filter((s) => s.id !== id))
+	}
+
+	return (
+		<div className="flex flex-col h-screen bg-background">
+			{/* Header */}
+			<header className="flex items-center gap-2 border-b px-3 py-2">
+				<Button variant="ghost" size="icon-sm" onClick={onBack} className="cursor-pointer">
+					<ArrowLeft className="size-3.5" />
+				</Button>
+				<span className="text-sm font-medium flex-1">History</span>
+				{sessions.length > 0 && (
+					<Button
+						variant="ghost"
+						size="sm"
+						onClick={async () => {
+							await clearSessions()
+							setSessions([])
+						}}
+						className="text-[10px] text-muted-foreground hover:text-destructive cursor-pointer h-6 px-2"
+					>
+						<Trash2 className="size-3 mr-1" />
+						Clear All
+					</Button>
+				)}
+			</header>
+
+			{/* List */}
+			<div className="flex-1 overflow-y-auto">
+				{loading && (
+					<div className="flex items-center justify-center h-32 text-xs text-muted-foreground">
+						Loading...
+					</div>
+				)}
+
+				{!loading && sessions.length === 0 && (
+					<div className="flex items-center justify-center h-32 text-xs text-muted-foreground">
+						No history yet
+					</div>
+				)}
+
+				{sessions.map((session) => (
+					<div
+						key={session.id}
+						role="button"
+						tabIndex={0}
+						onClick={() => onSelect(session.id)}
+						onKeyDown={(e) => e.key === 'Enter' && onSelect(session.id)}
+						className="w-full text-left px-3 py-2.5 border-b hover:bg-muted/50 transition-colors cursor-pointer flex items-start gap-2 group"
+					>
+						{/* Status icon */}
+						{session.status === 'completed' ? (
+							<CheckCircle className="size-3.5 text-green-500 shrink-0 mt-0.5" />
+						) : (
+							<XCircle className="size-3.5 text-destructive shrink-0 mt-0.5" />
+						)}
+
+						{/* Content */}
+						<div className="flex-1 min-w-0">
+							<p className="text-xs font-medium truncate">{session.task}</p>
+							<p className="text-[10px] text-muted-foreground mt-0.5">
+								{timeAgo(session.createdAt)} · {session.history.length} steps
+							</p>
+						</div>
+
+						{/* Delete */}
+						<button
+							type="button"
+							onClick={(e) => handleDelete(e, session.id)}
+							className="opacity-0 group-hover:opacity-100 transition-opacity p-1 hover:text-destructive cursor-pointer shrink-0"
+						>
+							<Trash2 className="size-3" />
+						</button>
+					</div>
+				))}
+			</div>
+		</div>
+	)
+}

packages/extension/src/entrypoints/sidepanel/components/cards.tsx

@@ -0,0 +1,386 @@
+import type {
+	AgentActivity,
+	AgentErrorEvent,
+	AgentStepEvent,
+	HistoricalEvent,
+	ObservationEvent,
+	RetryEvent,
+} from '@page-agent/core'
+import {
+	CheckCircle,
+	Eye,
+	Globe,
+	Keyboard,
+	Mouse,
+	MoveVertical,
+	RefreshCw,
+	Sparkles,
+	XCircle,
+	Zap,
+} from 'lucide-react'
+import { Fragment, useState } from 'react'
+
+import { cn } from '@/lib/utils'
+
+// Result card for done action
+function ResultCard({
+	success,
+	text,
+	children,
+}: {
+	success: boolean
+	text: string
+	children?: React.ReactNode
+}) {
+	return (
+		<div
+			className={cn(
+				'rounded-lg border p-3',
+				success ? 'border-green-500/30 bg-green-500/10' : 'border-destructive/30 bg-destructive/10'
+			)}
+		>
+			<div className="flex items-center gap-2 mb-2">
+				{success ? (
+					<CheckCircle className="size-3.5 text-green-500" />
+				) : (
+					<XCircle className="size-3.5 text-destructive" />
+				)}
+				<span
+					className={cn(
+						'text-xs font-medium',
+						success ? 'text-green-600 dark:text-green-400' : 'text-destructive'
+					)}
+				>
+					Result: {success ? 'Success' : 'Failed'}
+				</span>
+			</div>
+			<p className="text-xs text-[11px] text-muted-foreground pl-5 whitespace-pre-wrap">{text}</p>
+			{children}
+		</div>
+	)
+}
+
+// Single reflection item with truncation
+function ReflectionItem({ icon, value }: { icon: string; value: string }) {
+	const [expanded, setExpanded] = useState(false)
+
+	return (
+		<Fragment>
+			<span className="text-xs flex justify-center">{icon}</span>
+			<span
+				className={cn(
+					'text-[11px] text-muted-foreground cursor-pointer hover:text-muted-foreground/70',
+					!expanded && 'line-clamp-1'
+				)}
+				onClick={() => setExpanded(!expanded)}
+			>
+				{value}
+			</span>
+		</Fragment>
+	)
+}
+
+// Reflection section in step card
+function ReflectionSection({
+	reflection,
+}: {
+	reflection: {
+		evaluation_previous_goal?: string
+		memory?: string
+		next_goal?: string
+	}
+}) {
+	const items = [
+		{ icon: '☑️', label: 'eval', value: reflection.evaluation_previous_goal },
+		{ icon: '🧠', label: 'memory', value: reflection.memory },
+		{ icon: '🎯', label: 'goal', value: reflection.next_goal },
+	].filter((item) => item.value)
+
+	if (items.length === 0) return null
+
+	return (
+		<div className="mb-2">
+			{/* <div className="text-[11px] font-semibold text-foreground uppercase tracking-wide mb-2">
+				Reflection
+			</div> */}
+			<div className="grid grid-cols-[14px_1fr] gap-x-2 gap-y-2">
+				{items.map((item) => (
+					<ReflectionItem key={item.label} icon={item.icon} value={item.value!} />
+				))}
+			</div>
+		</div>
+	)
+}
+
+// Get icon for action type
+function ActionIcon({ name, className }: { name: string; className?: string }) {
+	const icons: Record<string, React.ReactNode> = {
+		click_element_by_index: <Mouse className={className} />,
+		input: <Keyboard className={className} />,
+		scroll: <MoveVertical className={className} />,
+		go_to_url: <Globe className={className} />,
+	}
+	return icons[name] || <Zap className={className} />
+}
+
+// Copy button with "Copied!" feedback
+function CopyButton({ text, label }: { text: string; label: string }) {
+	const [copied, setCopied] = useState(false)
+
+	return (
+		<button
+			type="button"
+			onClick={() => {
+				navigator.clipboard.writeText(text)
+				setCopied(true)
+				setTimeout(() => setCopied(false), 1500)
+			}}
+			className="text-[9px] text-muted-foreground hover:text-foreground transition-colors border px-1 rounded shrink-0 cursor-pointer backdrop-blur-xs"
+		>
+			{copied ? 'Copied!' : label}
+		</button>
+	)
+}
+
+// Extract message content by role from raw request
+function extractPrompt(rawRequest: unknown, role: 'system' | 'user'): string | null {
+	const messages = (rawRequest as { messages?: { role: string; content?: unknown }[] })?.messages
+	if (!messages) return null
+	const msg =
+		role === 'system'
+			? messages.find((m) => m.role === role)
+			: messages.findLast((m) => m.role === role)
+	if (!msg?.content) return null
+	return typeof msg.content === 'string' ? msg.content : JSON.stringify(msg.content, null, 2)
+}
+
+// Raw request/response section (collapsible tabs, for debugging)
+function RawSection({ rawRequest, rawResponse }: { rawRequest?: unknown; rawResponse?: unknown }) {
+	const [activeTab, setActiveTab] = useState<'request' | 'response' | null>(null)
+
+	if (!rawRequest && !rawResponse) return null
+
+	const handleTabClick = (tab: 'request' | 'response') => {
+		setActiveTab(activeTab === tab ? null : tab)
+	}
+
+	const content =
+		activeTab === 'request' ? rawRequest : activeTab === 'response' ? rawResponse : null
+
+	const systemPrompt = activeTab === 'request' ? extractPrompt(rawRequest, 'system') : null
+	const userPrompt = activeTab === 'request' ? extractPrompt(rawRequest, 'user') : null
+
+	return (
+		<div className="mt-2 border-t border-dashed pt-2">
+			<div className="flex items-center gap-3 -my-1">
+				{rawRequest != null && (
+					<button
+						type="button"
+						onClick={() => handleTabClick('request')}
+						className={cn(
+							'text-[10px] mt-0.5 transition-colors border-b cursor-pointer',
+							activeTab === 'request'
+								? 'text-foreground border-foreground'
+								: 'text-muted-foreground border-transparent hover:text-foreground'
+						)}
+					>
+						Raw Request
+					</button>
+				)}
+				{rawResponse != null && (
+					<button
+						type="button"
+						onClick={() => handleTabClick('response')}
+						className={cn(
+							'text-[10px] mt-0.5 transition-colors border-b cursor-pointer',
+							activeTab === 'response'
+								? 'text-foreground border-foreground'
+								: 'text-muted-foreground border-transparent hover:text-foreground'
+						)}
+					>
+						Raw Response
+					</button>
+				)}
+			</div>
+			{content != null && (
+				<div className="relative mt-1.5">
+					<div className="absolute top-1 right-1 flex gap-1">
+						{systemPrompt && <CopyButton text={systemPrompt} label="Copy System" />}
+						{userPrompt && <CopyButton text={userPrompt} label="Copy User" />}
+						<CopyButton text={JSON.stringify(content, null, 4)} label="Copy" />
+					</div>
+					<pre className="p-2 pt-5 text-[10px] text-foreground/70 bg-muted rounded overflow-x-auto max-h-60 overflow-y-auto">
+						{JSON.stringify(content, null, 4)}
+					</pre>
+				</div>
+			)}
+		</div>
+	)
+}
+
+function StepCard({ event }: { event: AgentStepEvent }) {
+	return (
+		<div className="rounded-lg border-l-2 border-l-blue-500/50 border bg-muted/40 p-2.5">
+			<div className="text-[11px] font-semibold text-foreground tracking-wide mb-2">
+				Step #{event.stepIndex! + 1}
+			</div>
+
+			{/* Reflection */}
+			{event.reflection && <ReflectionSection reflection={event.reflection} />}
+
+			{/* Action */}
+			{event.action && (
+				<div>
+					<div className="text-[11px] font-semibold text-foreground tracking-wide mb-1">
+						Actions
+					</div>
+					<div className="flex items-start gap-2">
+						<ActionIcon
+							name={event.action.name}
+							className="size-3.5 text-blue-500 shrink-0 mt-0.5"
+						/>
+						<div className="flex-1 min-w-0">
+							<p className="text-xs text-foreground/80 mb-0.5 wrap-anywhere break-all line-clamp-1 hover:line-clamp-none">
+								<span className="font-medium text-foreground/70">{event.action.name}</span>
+								{event.action.name !== 'done' && (
+									<span className="text-muted-foreground/70 ml-1.5">
+										{JSON.stringify(event.action.input)}
+									</span>
+								)}
+							</p>
+							<p className="text-[11px] text-muted-foreground/70 grid grid-cols-[auto_1fr] gap-1.5">
+								<span className="">└</span>
+								<span className="wrap-anywhere break-all line-clamp-1 hover:line-clamp-3">
+									{event.action.output}
+								</span>
+							</p>
+						</div>
+					</div>
+				</div>
+			)}
+
+			{/* Raw Response */}
+			<RawSection rawRequest={event.rawRequest} rawResponse={event.rawResponse} />
+		</div>
+	)
+}
+
+function ObservationCard({ event }: { event: ObservationEvent }) {
+	return (
+		<div className="rounded-lg border-l-2 border-l-green-500/50 border bg-muted/40 p-2.5">
+			{/* <div className="text-[11px] font-semibold text-foreground uppercase tracking-wide mb-2">
+				Observation
+			</div> */}
+			<div className="flex items-start gap-2">
+				<Eye className="size-3.5 text-green-500 shrink-0 mt-0.5" />
+				<span className="text-[11px] text-muted-foreground">{event.content}</span>
+			</div>
+		</div>
+	)
+}
+
+function RetryCard({ event }: { event: RetryEvent }) {
+	return (
+		<div className="rounded-lg border border-amber-500/30 bg-amber-500/10 p-2.5">
+			<div className="flex items-start gap-1.5">
+				<RefreshCw className="size-3 text-amber-500 shrink-0 mt-0.5" />
+				<span className="text-xs text-amber-600 dark:text-amber-400">
+					{event.message} ({event.attempt}/{event.maxAttempts})
+				</span>
+			</div>
+		</div>
+	)
+}
+
+function ErrorCard({ event }: { event: AgentErrorEvent }) {
+	return (
+		<div className="rounded-lg border border-destructive/30 bg-destructive/10 p-2.5">
+			<div className="flex items-start gap-1.5">
+				<XCircle className="size-3 text-destructive shrink-0 mt-0.5" />
+				<span className="text-xs text-destructive">{event.message}</span>
+			</div>
+			<RawSection rawResponse={event.rawResponse} />
+		</div>
+	)
+}
+
+// History event card component
+export function EventCard({ event }: { event: HistoricalEvent }) {
+	// Done action - show as result card
+	if (event.type === 'step' && event.action?.name === 'done') {
+		const input = event.action.input as { text?: string; success?: boolean }
+		return (
+			<>
+				<StepCard event={event as AgentStepEvent} />
+				<ResultCard
+					success={input?.success ?? true}
+					text={input?.text || event.action.output || ''}
+				/>
+			</>
+		)
+	}
+
+	if (event.type === 'step') {
+		return <StepCard event={event as AgentStepEvent} />
+	}
+
+	if (event.type === 'observation') {
+		return <ObservationCard event={event as ObservationEvent} />
+	}
+
+	if (event.type === 'retry') {
+		return <RetryCard event={event as RetryEvent} />
+	}
+
+	if (event.type === 'error') {
+		return <ErrorCard event={event as AgentErrorEvent} />
+	}
+
+	return null
+}
+
+// Activity card with animation
+export function ActivityCard({ activity }: { activity: AgentActivity }) {
+	const getActivityInfo = () => {
+		switch (activity.type) {
+			case 'thinking':
+				return { text: 'Thinking...', color: 'text-blue-500' }
+			case 'executing':
+				return { text: `Executing ${activity.tool}...`, color: 'text-amber-500' }
+			case 'executed':
+				return { text: `Done: ${activity.tool}`, color: 'text-green-500' }
+			case 'retrying':
+				return {
+					text: `Retrying (${activity.attempt}/${activity.maxAttempts})...`,
+					color: 'text-amber-500',
+				}
+			case 'error':
+				return { text: activity.message, color: 'text-destructive' }
+		}
+	}
+
+	const info = getActivityInfo()
+
+	return (
+		<div className="flex items-center gap-2 rounded-lg border bg-muted/40 p-2.5 animate-pulse">
+			<div className="relative">
+				<Sparkles className={cn('size-3.5', info.color)} />
+				<span
+					className={cn(
+						'absolute -top-0.5 -right-0.5 size-1.5 rounded-full animate-ping',
+						activity.type === 'thinking'
+							? 'bg-blue-500'
+							: activity.type === 'executing'
+								? 'bg-amber-500'
+								: activity.type === 'retrying'
+									? 'bg-amber-500'
+									: activity.type === 'error'
+										? 'bg-destructive'
+										: 'bg-green-500'
+					)}
+				/>
+			</div>
+			<span className={cn('text-xs', info.color)}>{info.text}</span>
+		</div>
+	)
+}

packages/extension/src/entrypoints/sidepanel/components/misc.tsx

@@ -0,0 +1,148 @@
+import type { AgentStatus } from '@page-agent/core'
+import { Motion } from 'ai-motion'
+import { BookOpen, Globe } from 'lucide-react'
+import { useEffect, useRef } from 'react'
+import { siGithub } from 'simple-icons'
+
+import { TypingAnimation } from '@/components/ui/typing-animation'
+import { cn } from '@/lib/utils'
+
+// Status dot indicator
+export function StatusDot({ status }: { status: AgentStatus }) {
+	const colorClass = {
+		idle: 'bg-muted-foreground',
+		running: 'bg-blue-500',
+		completed: 'bg-green-500',
+		error: 'bg-destructive',
+	}[status]
+
+	const label = {
+		idle: 'Ready',
+		running: 'Running',
+		completed: 'Done',
+		error: 'Error',
+	}[status]
+
+	return (
+		<div className="flex items-center gap-1.5 mr-2">
+			<span
+				className={cn('size-2 rounded-full', colorClass, status === 'running' && 'animate-pulse')}
+			/>
+			<span className="text-xs text-muted-foreground">{label}</span>
+		</div>
+	)
+}
+
+export function Logo({ className }: { className?: string }) {
+	return <img src="/assets/page-agent-256.webp" alt="Page Agent" className={cn('', className)} />
+}
+
+// Full-screen ai-motion glow overlay, shown only while running
+export function MotionOverlay({ active }: { active: boolean }) {
+	const containerRef = useRef<HTMLDivElement>(null)
+	const motionRef = useRef<Motion | null>(null)
+
+	useEffect(() => {
+		const mode = document.documentElement.classList.contains('dark') ? 'dark' : 'light'
+		const motion = new Motion({
+			mode,
+			borderWidth: 4,
+			borderRadius: 14,
+			glowWidth: mode === 'dark' ? 120 : 60,
+			styles: { position: 'absolute', inset: '0' },
+		})
+		motionRef.current = motion
+		containerRef.current!.appendChild(motion.element)
+		motion.autoResize(containerRef.current!)
+
+		return () => {
+			motion.dispose()
+			motionRef.current = null
+		}
+	}, [])
+
+	useEffect(() => {
+		const motion = motionRef.current
+		if (!motion) return
+
+		let disposed = false
+		if (active) {
+			motion.start()
+			motion.fadeIn()
+		} else {
+			motion.fadeOut().then(() => !disposed && motion.pause())
+		}
+		return () => {
+			disposed = true
+		}
+	}, [active])
+
+	return (
+		<div
+			ref={containerRef}
+			className="pointer-events-none absolute inset-0 z-10 opacity-60"
+			style={{ display: active ? undefined : 'none' }}
+		/>
+	)
+}
+
+// Empty state with logo and breathing glow
+export function EmptyState() {
+	return (
+		<div className="flex flex-col items-center justify-center h-full gap-4 text-center px-6">
+			<div className="relative select-none pointer-events-none">
+				<div className="absolute inset-0 -m-6 rounded-full bg-[conic-gradient(from_180deg,oklch(0.55_0.2_280),oklch(0.5_0.15_230),oklch(0.6_0.18_310),oklch(0.55_0.2_280))] blur-2xl animate-[glow-a_5s_ease-in-out_infinite]" />
+				<div className="absolute inset-0 -m-6 rounded-full bg-[conic-gradient(from_0deg,oklch(0.55_0.18_160),oklch(0.5_0.2_200),oklch(0.6_0.15_120),oklch(0.55_0.18_160))] blur-2xl animate-[glow-b_5s_ease-in-out_infinite]" />
+				<Logo className="relative size-20 opacity-80" />
+			</div>
+			<div>
+				<h2 className="text-base font-medium text-foreground mb-1">Page Agent Ext</h2>
+				<TypingAnimation
+					className="text-sm text-muted-foreground"
+					words={[
+						'Enter a task to automate this page',
+						'Execute multi-page tasks',
+						'Call this extension from your web page',
+						'Use this extension in your own agents',
+					]}
+					cursorStyle="underscore"
+					loop
+					typeSpeed={20}
+					deleteSpeed={10}
+					pauseDelay={3000}
+				/>
+			</div>
+			<div className="flex items-center gap-3 mt-1 text-muted-foreground">
+				<a
+					href="https://github.com/alibaba/page-agent"
+					target="_blank"
+					rel="noopener noreferrer"
+					className="hover:text-foreground transition-colors"
+					title="GitHub"
+				>
+					<svg role="img" viewBox="0 0 24 24" className="size-4 fill-current">
+						<path d={siGithub.path} />
+					</svg>
+				</a>
+				<a
+					href="https://alibaba.github.io/page-agent/docs/features/chrome-extension"
+					target="_blank"
+					rel="noopener noreferrer"
+					className="hover:text-foreground transition-colors"
+					title="Documentation"
+				>
+					<BookOpen className="size-4" />
+				</a>
+				<a
+					href="https://alibaba.github.io/page-agent"
+					target="_blank"
+					rel="noopener noreferrer"
+					className="hover:text-foreground transition-colors"
+					title="Website"
+				>
+					<Globe className="size-4" />
+				</a>
+			</div>
+		</div>
+	)
+}

packages/extension/src/entrypoints/sidepanel/index.html

@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+		<link rel="icon" type="image/png" href="/assets/page-agent-64.png" />
+		<title>Page Agent</title>
+	</head>
+	<body>
+		<div id="root"></div>
+		<script type="module" src="./main.tsx"></script>
+	</body>
+</html>

packages/extension/src/entrypoints/sidepanel/main.tsx

@@ -0,0 +1,25 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+
+import App from './App'
+import { ErrorBoundary } from './components/ErrorBoundary'
+
+import '@/assets/index.css'
+
+// Sync dark mode with system preference
+const syncDarkMode = () => {
+	document.documentElement.classList.toggle(
+		'dark',
+		matchMedia('(prefers-color-scheme: dark)').matches
+	)
+}
+syncDarkMode()
+matchMedia('(prefers-color-scheme: dark)').addEventListener('change', syncDarkMode)
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+	<React.StrictMode>
+		<ErrorBoundary>
+			<App />
+		</ErrorBoundary>
+	</React.StrictMode>
+)

packages/extension/src/lib/db.ts

@@ -0,0 +1,70 @@
+import type { HistoricalEvent } from '@page-agent/core'
+import { type DBSchema, type IDBPDatabase, openDB } from 'idb'
+
+const DB_NAME = 'page-agent-ext'
+const DB_VERSION = 1
+
+export interface SessionRecord {
+	id: string
+	task: string
+	history: HistoricalEvent[]
+	status: 'completed' | 'error'
+	createdAt: number
+}
+
+interface PageAgentDB extends DBSchema {
+	sessions: {
+		key: string
+		value: SessionRecord
+		indexes: { 'by-created': number }
+	}
+}
+
+let dbPromise: Promise<IDBPDatabase<PageAgentDB>> | null = null
+
+function getDB() {
+	if (!dbPromise) {
+		dbPromise = openDB<PageAgentDB>(DB_NAME, DB_VERSION, {
+			upgrade(db) {
+				const store = db.createObjectStore('sessions', { keyPath: 'id' })
+				store.createIndex('by-created', 'createdAt')
+			},
+		})
+	}
+	return dbPromise
+}
+
+export async function saveSession(
+	session: Omit<SessionRecord, 'id' | 'createdAt'>
+): Promise<SessionRecord> {
+	const db = await getDB()
+	const record: SessionRecord = {
+		...session,
+		id: crypto.randomUUID(),
+		createdAt: Date.now(),
+	}
+	await db.put('sessions', record)
+	return record
+}
+
+/** List sessions, newest first */
+export async function listSessions(): Promise<SessionRecord[]> {
+	const db = await getDB()
+	const all = await db.getAllFromIndex('sessions', 'by-created')
+	return all.reverse()
+}
+
+export async function getSession(id: string): Promise<SessionRecord | undefined> {
+	const db = await getDB()
+	return db.get('sessions', id)
+}
+
+export async function deleteSession(id: string): Promise<void> {
+	const db = await getDB()
+	await db.delete('sessions', id)
+}
+
+export async function clearSessions(): Promise<void> {
+	const db = await getDB()
+	await db.clear('sessions')
+}

packages/extension/src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { type ClassValue, clsx } from 'clsx'
+import { twMerge } from 'tailwind-merge'
+
+export function cn(...inputs: ClassValue[]) {
+	return twMerge(clsx(inputs))
+}

packages/extension/src/types/assets.d.ts

@@ -0,0 +1,25 @@
+// Asset type declarations
+declare module '*.webp' {
+	const src: string
+	export default src
+}
+
+declare module '*.png' {
+	const src: string
+	export default src
+}
+
+declare module '*.jpg' {
+	const src: string
+	export default src
+}
+
+declare module '*.jpeg' {
+	const src: string
+	export default src
+}
+
+declare module '*.svg' {
+	const src: string
+	export default src
+}

packages/extension/src/types/globals.d.ts

@@ -0,0 +1,2 @@
+declare const __EXT_VERSION__: string
+declare const __CORE_VERSION__: string

packages/extension/src/types/markdown.d.ts

@@ -0,0 +1,4 @@
+declare module '*.md?raw' {
+	const content: string
+	export default content
+}

packages/extension/tsconfig.json

@@ -0,0 +1,28 @@
+{
+    "extends": "./.wxt/tsconfig.json",
+    "compilerOptions": {
+        "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.tsbuildinfo",
+        "useDefineForClassFields": true,
+        "noEmit": false,
+        "allowImportingTsExtensions": false,
+        "strictNullChecks": true,
+        "jsx": "react-jsx",
+        "baseUrl": ".",
+        "paths": {
+            // Self root
+            "@/*": ["src/*"],
+
+            "@page-agent/llms": ["../llms/src/index.ts"],
+            "@page-agent/page-controller": ["../page-controller/src/PageController.ts"],
+            "@page-agent/core": ["../core/src/PageAgentCore.ts"],
+            "@page-agent/ui": ["../ui/src/index.ts"]
+        }
+    },
+    "references": [
+        //
+        { "path": "../llms" },
+        { "path": "../page-controller" },
+        { "path": "../core" },
+        { "path": "../ui" }
+    ]
+}

packages/extension/wxt.config.js

@@ -0,0 +1,63 @@
+import tailwindcss from '@tailwindcss/vite'
+import { mkdirSync, readFileSync } from 'node:fs'
+import { defineConfig } from 'wxt'
+
+const chromeProfile = '.wxt/chrome-data'
+mkdirSync(chromeProfile, { recursive: true })
+
+const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'))
+
+// See https://wxt.dev/api/config.html
+export default defineConfig({
+	srcDir: 'src',
+	modules: ['@wxt-dev/module-react'],
+	webExt: {
+		chromiumProfile: chromeProfile,
+		keepProfileChanges: true,
+		chromiumArgs: ['--hide-crash-restore-bubble'],
+	},
+	vite: () => ({
+		plugins: [tailwindcss()],
+		define: {
+			__EXT_VERSION__: JSON.stringify(pkg.version),
+			__CORE_VERSION__: JSON.stringify(pkg.dependencies['@page-agent/core']),
+		},
+		optimizeDeps: {
+			force: true,
+		},
+		build: {
+			minify: false,
+			chunkSizeWarningLimit: 2000,
+			cssCodeSplit: true,
+			rollupOptions: {
+				onwarn: function (message, handler) {
+					if (message.code === 'EVAL') return
+					handler(message)
+				},
+			},
+		},
+	}),
+	manifest: {
+		default_locale: 'en',
+		name: '__MSG_extName__',
+		description: '__MSG_extDescription__',
+		homepage_url: 'https://alibaba.github.io/page-agent/',
+		permissions: ['tabs', 'tabGroups', 'sidePanel', 'storage'],
+		host_permissions: ['<all_urls>'],
+		icons: {
+			64: 'assets/page-agent-64.png',
+		},
+		action: {
+			default_title: '__MSG_extActionTitle__',
+		},
+		web_accessible_resources: [
+			{
+				resources: ['main-world.js'],
+				matches: ['*://*/*'],
+			},
+		],
+		side_panel: {
+			default_path: 'sidepanel/index.html',
+		},
+	},
+})

packages/llms/README.md

@@ -1,41 +0,0 @@
-# @page-agent/llms
-
-LLM client with a **reflection-before-action** mental model for page-agent.
-
-## Why This Package Exists
-
-The LLM module and the agent logic are inherently coupled. This package exists not to decouple them, but to **define the interface contract** between the LLM and the agent.
-
-The core abstraction is the `MacroToolInput` — a structured output format that **forces the model to reflect before acting**.
-
-## The Reflection-Before-Action Model
-
-Every tool call must first output its reasoning state before the actual action:
-
-```typescript
-interface MacroToolInput {
-  // Reflection (mandatory before any action)
-  evaluation_previous_goal?: string  // How well did the previous action work?
-  memory?: string                     // Key information to remember
-  next_goal?: string                  // What to accomplish next
-
-  // Action (the actual operation)
-  action: Record<string, any>
-}
-```
-
-This design ensures that:
-
-1. **The model evaluates its previous action** before deciding the next step
-2. **Working memory is explicitly maintained** across conversation turns
-3. **Goals are clearly stated**, making the agent's reasoning transparent and debuggable
-
-## Key Components
-
-| Export | Description |
-|--------|-------------|
-| `LLM` | Main LLM client class with retry logic |
-| `MacroToolInput` | The reflection-before-action input schema |
-| `AgentBrain` | Agent's thinking state (eval, memory, goal) |
-| `LLMConfig` | Configuration for LLM connection |
-| `parseLLMConfig` | Parse and apply defaults to config |

packages/llms/package.json

@@ -1,43 +1,43 @@
 {
-	"name": "@page-agent/llms",
-	"version": "0.2.2",
-	"type": "module",
-	"main": "./dist/lib/page-agent-llms.js",
-	"module": "./dist/lib/page-agent-llms.js",
-	"types": "./dist/lib/index.d.ts",
-	"exports": {
-		".": {
-			"types": "./dist/lib/index.d.ts",
-			"import": "./dist/lib/page-agent-llms.js",
-			"default": "./dist/lib/page-agent-llms.js"
-		}
-	},
-	"files": [
-		"dist/"
-	],
-	"description": "LLM client with reflection-before-action mental model for page-agent",
-	"keywords": [
-		"page-agent",
-		"llm",
-		"openai",
-		"tool-calling",
-		"agent"
-	],
-	"author": "Simon<gaomeng1900>",
-	"license": "MIT",
-	"repository": {
-		"type": "git",
-		"url": "https://github.com/alibaba/page-agent.git",
-		"directory": "packages/llms"
-	},
-	"homepage": "https://alibaba.github.io/page-agent/",
-	"scripts": {
-		"build": "vite build",
-		"prepublishOnly": "node -e \"const fs=require('fs');['LICENSE'].forEach(f=>fs.copyFileSync('../../'+f,f))\"",
-		"postpublish": "node -e \"['LICENSE'].forEach(f=>{try{require('fs').unlinkSync(f)}catch{}})\""
-	},
-	"dependencies": {
-		"chalk": "^5.6.2",
-		"zod": "^4.3.5"
-	}
+    "name": "@page-agent/llms",
+    "version": "1.4.0",
+    "type": "module",
+    "main": "./dist/lib/page-agent-llms.js",
+    "module": "./dist/lib/page-agent-llms.js",
+    "types": "./dist/lib/index.d.ts",
+    "exports": {
+        ".": {
+            "types": "./dist/lib/index.d.ts",
+            "import": "./dist/lib/page-agent-llms.js",
+            "default": "./dist/lib/page-agent-llms.js"
+        }
+    },
+    "files": [
+        "dist/"
+    ],
+    "description": "LLM client with reflection-before-action mental model for page-agent",
+    "keywords": [
+        "page-agent",
+        "llm",
+        "openai",
+        "tool-calling",
+        "agent"
+    ],
+    "author": "Simon<gaomeng1900>",
+    "license": "MIT",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/alibaba/page-agent.git",
+        "directory": "packages/llms"
+    },
+    "homepage": "https://alibaba.github.io/page-agent/",
+    "scripts": {
+        "build": "vite build",
+        "prepublishOnly": "node -e \"const fs=require('fs');['LICENSE'].forEach(f=>fs.copyFileSync('../../'+f,f))\"",
+        "postpublish": "node -e \"['LICENSE'].forEach(f=>{try{require('fs').unlinkSync(f)}catch{}})\""
+    },
+    "dependencies": {
+        "chalk": "^5.6.2",
+        "zod": "^4.3.5"
+    }
 }

packages/llms/src/OpenAIClient.ts

@@ -1,6 +1,8 @@
 /**
  * OpenAI Client implementation
  */
+import * as z from 'zod'
+
 import { InvokeError, InvokeErrorType } from './errors'
 import type { InvokeOptions, InvokeResult, LLMClient, LLMConfig, Message, Tool } from './types'
 import { modelPatch, zodToOpenAITool } from './utils'
@@ -39,6 +41,8 @@ export class OpenAIClient implements LLMClient {
 				: 'required',
 		}
 
+		modelPatch(requestBody)
+
 		// 2. Call API
 		let response: Response
 		try {
@@ -48,12 +52,14 @@ export class OpenAIClient implements LLMClient {
 					'Content-Type': 'application/json',
 					Authorization: `Bearer ${this.config.apiKey}`,
 				},
-				body: JSON.stringify(modelPatch(requestBody)),
+				body: JSON.stringify(requestBody),
 				signal: abortSignal,
 			})
 		} catch (error: unknown) {
-			console.error(error)
-			throw new InvokeError(InvokeErrorType.NETWORK_ERROR, 'Network request failed', error)
+			const isAbortError = (error as any)?.name === 'AbortError'
+			const errorMessage = isAbortError ? 'Network request aborted' : 'Network request failed'
+			if (!isAbortError) console.error(error)
+			throw new InvokeError(InvokeErrorType.NETWORK_ERROR, errorMessage, error)
 		}
 
 		// 3. Handle HTTP errors
@@ -107,14 +113,23 @@ export class OpenAIClient implements LLMClient {
 			case 'length':
 				throw new InvokeError(
 					InvokeErrorType.CONTEXT_LENGTH,
-					'Response truncated: max tokens reached'
+					'Response truncated: max tokens reached',
+					undefined,
+					data
 				)
 			case 'content_filter':
-				throw new InvokeError(InvokeErrorType.CONTENT_FILTER, 'Content filtered by safety system')
+				throw new InvokeError(
+					InvokeErrorType.CONTENT_FILTER,
+					'Content filtered by safety system',
+					undefined,
+					data
+				)
 			default:
 				throw new InvokeError(
 					InvokeErrorType.UNKNOWN,
-					`Unexpected finish_reason: ${choice.finish_reason}`
+					`Unexpected finish_reason: ${choice.finish_reason}`,
+					undefined,
+					data
 				)
 		}
 
@@ -128,7 +143,8 @@ export class OpenAIClient implements LLMClient {
 			throw new InvokeError(
 				InvokeErrorType.NO_TOOL_CALL,
 				'No tool call found in response',
-				normalizedData
+				undefined,
+				data
 			)
 		}
 
@@ -137,7 +153,8 @@ export class OpenAIClient implements LLMClient {
 			throw new InvokeError(
 				InvokeErrorType.UNKNOWN,
 				`Tool "${toolCallName}" not found in tools`,
-				normalizedData
+				undefined,
+				data
 			)
 		}
 
@@ -147,7 +164,8 @@ export class OpenAIClient implements LLMClient {
 			throw new InvokeError(
 				InvokeErrorType.INVALID_TOOL_ARGS,
 				'No tool call arguments found',
-				normalizedData
+				undefined,
+				data
 			)
 		}
 
@@ -158,18 +176,20 @@ export class OpenAIClient implements LLMClient {
 			throw new InvokeError(
 				InvokeErrorType.INVALID_TOOL_ARGS,
 				'Failed to parse tool arguments as JSON',
-				error
+				error,
+				data
 			)
 		}
 
 		// Validate with schema
 		const validation = tool.inputSchema.safeParse(parsedArgs)
 		if (!validation.success) {
-			console.error(validation.error)
+			console.error(z.prettifyError(validation.error))
 			throw new InvokeError(
 				InvokeErrorType.INVALID_TOOL_ARGS,
 				'Tool arguments validation failed',
-				validation.error
+				validation.error,
+				data
 			)
 		}
 		const toolInput = validation.data
@@ -182,7 +202,8 @@ export class OpenAIClient implements LLMClient {
 			throw new InvokeError(
 				InvokeErrorType.TOOL_EXECUTION_ERROR,
 				`Tool execution failed: ${(e as Error).message}`,
-				e
+				e,
+				data
 			)
 		}
 
@@ -201,6 +222,7 @@ export class OpenAIClient implements LLMClient {
 				reasoningTokens: data.usage?.completion_tokens_details?.reasoning_tokens,
 			},
 			rawResponse: data,
+			rawRequest: requestBody,
 		}
 	}
 }

packages/llms/src/env.d.ts

@@ -1 +0,0 @@
-/// <reference types="vite/client" />