chore(version): bump version to 1.6.0

fix(PageController): same-origin iframe actions

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -6,32 +6,11 @@ body:
   - type: markdown
     attributes:
       value: |
-        Please follow our community communication guidelines when filing issues.
-        - Be polite and respectful.
-        - Prefer constructive, actionable feedback over venting.
-        - Include clear reproduction steps and environment details.
-        - Consider contributing a fix if possible — PRs are welcome.
+        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。
 
-        提交 Issue 时请遵守社区沟通规范：
-        - 保持礼貌与尊重。
-        - 提供建设性、可行动的反馈，避免情绪化表达。
-        - 请包含清晰的复现步骤与环境信息。
-        - 如果可以，欢迎直接提交修复 PR。
-
-        See: CODE_OF_CONDUCT.md / CODE_OF_CONDUCT_zh.md, CONTRIBUTING.md
-
-  - type: checkboxes
-    id: community
-    attributes:
-      label: Community Communication / 社区沟通
-      description: Confirm you will communicate respectfully and constructively / 确认将以礼貌、建设性的方式沟通
-      options:
-        - label: I will be polite and respectful. / 我会保持礼貌与尊重。
-          required: true
-        - label: I will share constructive, actionable details. / 我会提供建设性、可行动的细节。
-          required: true
-        - label: I have read the Code of Conduct. / 我已阅读行为准则。
-          required: true
+        - [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
     id: description
@@ -48,7 +27,7 @@ body:
       render: typescript
       placeholder: Minimal reproduction code
     validations:
-      required: true
+      required: false
 
   - type: input
     id: browser
@@ -56,12 +35,27 @@ body:
       label: Browser
       placeholder: 'Chrome 120, Firefox 119, etc.'
     validations:
-      required: true
+      required: false
 
   - type: input
     id: version
     attributes:
       label: version
       placeholder: '0.0.0'
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: community
+    attributes:
+      label: Community Communication / 社区沟通
+      description: Confirm you will communicate respectfully and constructively / 确认将以礼貌、建设性的方式沟通
+      options:
+        - label: I will be polite and respectful. / 我会保持礼貌与尊重。
+          required: true
+        - label: I will share constructive, actionable suggestions. / 我会提供建设性、可行动的建议。
+          required: true
+        - label: I have read the Code of Conduct. / 我已阅读行为准则。
+          required: true
     validations:
       required: true

.github/ISSUE_TEMPLATE/config.yml

@@ -10,8 +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。
-  - name: 行为准则（中文）
-    url: https://github.com/alibaba/page-agent/blob/main/CODE_OF_CONDUCT_zh.md
-    about: 中文版社区行为准则。

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -6,19 +6,30 @@ body:
   - type: markdown
     attributes:
       value: |
-        Please follow our community communication guidelines when proposing features.
-        - Be polite and respectful.
-        - Explain the problem first, then propose solutions.
-        - Prefer constructive, actionable suggestions.
-        - Contributions are encouraged — consider opening a PR.
+        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。
 
-        提交功能建议时请遵守社区沟通规范：
-        - 保持礼貌与尊重。
-        - 先阐述问题，再提出解决方案。
-        - 提供建设性、可行动的建议。
-        - 鼓励代码贡献，欢迎直接提交 PR。
+        - [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)
 
-        See: CODE_OF_CONDUCT.md / CODE_OF_CONDUCT_zh.md, CONTRIBUTING.md
+  - type: textarea
+    id: description
+    attributes:
+      label: Feature Description / 功能描述
+      description: Describe the problem, solution, and any API changes. / 描述问题、解决方案以及 API 变更。
+      placeholder: |
+        **Problem**:
+        What problem does this solve?
+
+        **Solution**:
+        How should this work?
+
+        **Proposed API**:
+        ```typescript
+        // code here
+        ```
+    validations:
+      required: true
 
   - type: checkboxes
     id: community
@@ -32,27 +43,5 @@ body:
           required: true
         - label: I have read the CODE_OF_CONDUCT.md and CONTRIBUTING.md. / 我已阅读行为准则。
           required: true
-
-  - type: textarea
-    id: problem
-    attributes:
-      label: Problem
-      placeholder: What problem does this solve?
     validations:
       required: true
-
-  - type: textarea
-    id: solution
-    attributes:
-      label: Solution
-      placeholder: How should this work?
-    validations:
-      required: true
-
-  - type: textarea
-    id: api
-    attributes:
-      label: Proposed API
-      render: typescript
-    validations:
-      required: false

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,9 +5,12 @@ Brief description of changes.
 ## Type
 
 - [ ] Bug fix
-- [ ] New feature
-- [ ] Breaking change
+- [ ] Feature / Improvement
+- [ ] Refactor
 - [ ] Documentation
+- [ ] Website
+- [ ] Demo / Testing
+- [ ] Breaking change
 
 ## Testing
 
@@ -19,10 +22,5 @@ Closes #(issue)
 
 ## Requirements / 要求
 
-- [ ] I will be polite and respectful. / 我会保持礼貌与尊重。
-- [ ] My comments and replies are constructive and actionable. / 我的评论与回复具有建设性。
-- [ ] 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。
-
-## Contributing / 贡献
-
-Constructive suggestions and code contributions are encouraged. If this PR originated from a discussion or issue, please link it above. 欢迎建设性意见与代码贡献；如源自讨论或 Issue，请在上方关联链接。
+- [ ] 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。
+- [ ] This PR is NOT generated by a bot or AI agent acting autonomously. I have authored or meaningfully reviewed every change. / 此 PR 不是由 bot 或 AI 自主生成的，我已亲自编写或充分审查了每一处变更。

.github/workflows/ci.yml

@@ -13,10 +13,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [20, 22]
+        node-version: [24]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6
@@ -24,6 +24,13 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: 'npm'
 
+      # test on default version of npm
+      # - 9.6~10.8 on node@20
+      # - 11.3~11.6 on node@24
+
+      - name: Node and NPM version
+        run: node --version && npm --version
+
       - name: Install dependencies
         run: npm install
 

.github/workflows/deploy-demo.yml

@@ -13,19 +13,19 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 24
           cache: 'npm'
 
       - name: Install dependencies
         run: npm ci
 
       - name: Build demo
-        run: npm run build
+        run: npm run build:website
 
       - name: Setup Pages
         uses: actions/configure-pages@v5
@@ -33,7 +33,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v4
         with:
-          path: './dist'
+          path: './packages/website/dist'
 
       - name: Deploy to GitHub Pages
         id: deployment

.github/workflows/release.yml

@@ -6,30 +6,38 @@ on:
       - 'v*'
 
 permissions:
-  id-token: write  # Required for OIDC
+  id-token: write # Required for OIDC
   contents: read
 
 jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 24
           registry-url: 'https://registry.npmjs.org'
 
       # Ensure npm 11.5.1 or later is installed
       - name: Update npm
         run: npm install -g npm@latest
-        
+
       - name: Install dependencies
         run: npm ci
 
       - name: Build
-        run: npm run build:lib
+        run: npm run build:libs
 
-      - name: Publish to npm
-        run: npm publish
+      - name: Publish all public packages
+        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

@@ -23,7 +23,19 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+.qoder
 
+# env files
+.env
+.env.*
 
-# 
-.env
+# extension
+.output
+.wxt
+
+# AI
+.agent
+.claude
+.cursor
+.gemini
+CLAUDE.md

.husky/pre-commit

@@ -1 +1 @@
-npx lint-staged
+npx lint-staged --allow-empty

.vscode/extensions.json

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

.vscode/settings.json

@@ -1,18 +1,39 @@
 {
-	"editor.fontLigatures": true,
-	"cSpell.words": ["HITL", "opensource", "retryable"],
-	"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": [
+        "contenteditable",
+        "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

@@ -1,161 +1,134 @@
-# Instructions for coding assistants
+# Instructions for Coding Assistants
 
 ## Project Overview
 
-This is a dual-architecture project with **two separate parts**:
+This is a **monorepo** with npm workspaces:
 
-1. **Core Library** (`src/`) - Pure JavaScript/TypeScript AI agent library for browser DOM automation
-2. **Demo&docs Website** (`pages/`) - React documentation and landing page
+- **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:
+
+- **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
 
 ## Development Commands
 
-### Core Commands
-
 ```bash
-npm start                    # Start React website development server
-npm run build                # Build both library AND website
-npm run build:lib            # Build pure JS library only (src/ → dist/lib/)
-npm run build:lib:watch      # Library development with auto-rebuild
+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 & Critical Patterns
+## Architecture
 
-### Dual Build System
+### Monorepo Structure
 
-- **Website build**: `vite.config.js` → React SPA with hash routing → `dist/`
-- **Library build**: `vite.lib.config.js` → UMD/ES modules → `dist/lib/`
-- **Entry points**: `src/entry.ts` (library), `pages/main.tsx` (website)
+Simple monorepo solution: TypeScript references + Vite aliases. Update tsconfig and vite config when adding/removing packages.
 
-### Module Boundaries (Critical)
+```
+packages/
+├── 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
+```
 
-- **Core library** (`src/`): NEVER import from `pages/` - must remain pure JavaScript
-- **Website** (`pages/`): CAN import from `src/` via `@/` alias for demos
-- **Import aliases**: `@/` → `src/`, `@pages/` → `pages/`
+`workspaces` in `package.json` must be in topological order.
+
+### Module Boundaries
+
+- **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. 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
+
+All communication is async and isolated:
+
+```typescript
+// PageAgent delegates DOM operations to PageController
+await this.pageController.updateTree()
+await this.pageController.clickElement(index)
+await this.pageController.inputText(index, text)
+await this.pageController.scroll({ down: true, numPages: 1 })
+
+// PageController exposes state via async methods
+const simplifiedHTML = await this.pageController.getSimplifiedHTML()
+const pageInfo = await this.pageController.getPageInfo()
+```
 
 ### DOM Pipeline
 
-1. **DOM Extraction**: Convert live DOM to `FlatDomTree` via `src/dom/dom_tree/`
-2. **Dehydration**: DOM tree → simplified text for LLM processing
-3. **LLM Processing**: AI model returns action plans
-4. **Indexed Operations**: Map LLM responses back to specific DOM elements
+1. **DOM Extraction**: Live DOM → `FlatDomTree` via `page-controller/src/dom/dom_tree/`
+2. **Dehydration**: DOM tree → simplified text for LLM
+3. **LLM Processing**: AI returns action plans (page-agent)
+4. **Indexed Operations**: PageAgent calls PageController by element index
 
-### Event Bus Communication
+## Key Files Reference
 
-Use `src/utils/bus.ts` for decoupled PageAgent ↔ UI communication:
+### Page Agent (`packages/page-agent/`)
 
-```typescript
-// Emit from PageAgent
-getEventBus().emit('panel:show')
-getEventBus().emit('panel:update', { status: 'thinking' })
+| File               | Description                                  |
+| ------------------ | -------------------------------------------- |
+| `src/PageAgent.ts` | ⭐ Main class with UI, extends PageAgentCore |
+| `src/demo.ts`      | IIFE demo entry (auto-init with demo API)    |
 
-// Listen in UI components
-getEventBus().on('panel:show', () => panel.show())
-```
+### Core (`packages/core/`)
 
-### Hash Routing Requirement
+| 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                 |
 
-Uses wouter with `useHashLocation` for static hosting:
+### LLMs (`packages/llms/`)
 
-```tsx
-<Router hook={useHashLocation}>  // Always hash-based routes
-```
+| File                  | Description                           |
+| --------------------- | ------------------------------------- |
+| `src/index.ts`        | ⭐ LLM class with retry logic         |
+| `src/types.ts`        | MacroToolInput, AgentBrain, LLMConfig |
+| `src/OpenAIClient.ts` | OpenAI-compatible client              |
 
-### CDN Auto-Injection Pattern
+### Page Controller (`packages/page-controller/`)
 
-Library auto-initializes when injected via script tag:
-
-```html
-<script src="page-agent.js?model=gpt-4"></script>
-```
-
-Query params configure `PageAgentConfig` automatically in `src/entry.ts`.
-
-## File Organization
-
-### Core Library (`src/`)
-
-- `entry.ts` - CDN/UMD entry point with auto-initialization
-- `PageAgent.ts` - **Main AI agent class** orchestrating DOM operations
-- `tools/` - Agent tool implementations for web actions
-- `ui/` - UI components (Panel, SimulatorMask) with CSS modules
-- `utils/bus.ts` - **Type-safe event bus** for decoupled communication
-- `patches/` - Framework-specific optimizations (React, Antd compatibility)
-- `llms/` - LLM integration and communication layer
-- `dom/` - HTML serialization and page analysis utilities
-- `config/` - Configuration constants and settings
-
-### Website (`pages/`)
-
-- `main.tsx` - Site entry with hash routing setup
-- `router.tsx` - **Manual route definitions** (requires explicit registration)
-- `components/DocsLayout.tsx` - Navigation structure (hardcoded nav items)
-- `docs/[section]/[topic]/page.tsx` - Documentation pages
-- `test-pages/` - Library integration test pages
+| File                        | Description                                                |
+| --------------------------- | ---------------------------------------------------------- |
+| `src/PageController.ts`     | ⭐ Main controller class with optional mask support        |
+| `src/SimulatorMask.ts`      | Visual overlay blocking user interaction during automation |
+| `src/actions.ts`            | Element interactions (click, input, scroll)                |
+| `src/dom/dom_tree/index.js` | Core DOM extraction engine                                 |
 
 ## Adding New Features
 
-### New Documentation Page
-
-1. Create `pages/docs/<section>/<slug>/page.tsx`
-2. Add route to `pages/router.tsx` with `<Header /> + <DocsLayout>` wrapper
-3. Add navigation item to `DocsLayout.tsx`
-
 ### New Agent Tool
 
-1. Implement under `src/tools/`
-2. Export via `src/tools/index.ts`
-3. Wire into `PageAgent.ts` if needed
+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
 
-### New UI Component
+### New PageController Action
 
-1. Create in `src/ui/` with colocated CSS modules
-2. Use event bus for PageAgent communication
-3. Test via `pages/test-pages/`
+1. Add implementation in `packages/page-controller/src/actions.ts`
+2. Expose via async method in `PageController.ts`
+3. Export from `packages/page-controller/src/index.ts`
 
 ## Code Standards
 
-### TypeScript
-
 - Explicit typing for exported/public APIs
 - ESLint relaxes some unsafe rules for rapid iteration
-
-### CSS & Styling
-
-- **Prefer Tailwind CSS over custom CSS**
-- Custom CSS variables for theme gradients in `src/index.css`
-- Dark mode support via `dark:` classes
-- CSS modules for component-specific styles
-
-### Import Organization
-
-- External libraries first
-- Internal modules (`@/`, `@pages/`)
-- Relative imports last
-- Blank lines between groups
-
-## Critical Files to Understand
-
-- `pages/router.tsx` - Central routing definition (manual registration required)
-- `pages/components/DocsLayout.tsx` - Navigation structure
-- `src/PageAgent.ts` - Core AI agent class with DOM manipulation
-- `src/dom/dom_tree/index.js` - DOM extraction engine
-- `src/utils/bus.ts` - Type-safe event bus system
-- `src/entry.ts` - Library entry point for CDN usage
-- `vite.config.js` / `vite.lib.config.js` - Dual build configuration
-
-## Debugging Common Issues
-
-### Blank Documentation Pages
-
-1. Verify route exists in `pages/router.tsx`
-2. Check component import path
-3. Verify CSS isn't hiding content (check dark mode classes)
-4. Test with minimal component first
-
-### Library Integration Issues
-
-1. Check `dist/lib/page-agent.umd.js` builds correctly
-2. Test CDN injection with query params
-3. Verify event bus communications are properly typed
-4. Use `pages/test-pages/` for isolated testing
+- 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

@@ -1,31 +1,39 @@
-# Contributing to Page-Agent
+# Contributing to PageAgent
 
-Thank you for your interest in contributing to Page-Agent! We welcome contributions from everyone.
+♥️ We welcome contributions from everyone.
 
 ## 🚀 Quick Start
 
 ### Development Setup
 
 1. **Prerequisites**
-   - Node.js 20+
-   - npm 10+
-   - typescript as required in package.json
-   - vscode or other editors that support ts/eslint/prettier
-   - make sure `eslint`, `auto-format` and `commit-lint` all work
+    - `macOS` / `Linux` / `WSL`
+    - `node.js >= 20` with `npm >= 10`
+    - An editor that supports `ts/eslint/prettier`
+    - Make sure `eslint`, `prettier` and `commitlint` work well. Un-linted code won't pass the CI.
 
 2. **Setup**
 
-   ```bash
-   npm install
-   npm start          # Start demo and documentation site
-   ```
+    ```bash
+    npm i
+    npm start          # Start demo and documentation site
+    npm run build      # Build libs and website
+    ```
 
 ### Project Structure
 
-This project has **two separate parts**:
+This is a **monorepo** with npm workspaces containing **4 main packages**:
 
-- **Core Library** (`src/`) - Pure JavaScript AI agent library
-- **Documentation Website** (`pages/`) - React web app for landing page and docs
+- **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.
+> 
+> - When developing. Use alias so that we don't have to pre-build.
+> - When bundling. Use external and disable ts `paths` alias.
+> - When bundling `IIFE` and `Website`. Bundle everything together.
 
 ## 🤝 How to Contribute
 
@@ -40,40 +48,40 @@ This project has **two separate parts**:
 
 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**
-
-   ```bash
-   # TODO
-   ```
+    - Build and lint everything.
+    - 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
 
@@ -85,89 +93,108 @@ This project has **two separate parts**:
 - Keep functions small and focused
 - Add JSDoc for public APIs
 
-### Vibe coding with AI
+### 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!!!
+> [Vibe coding](https://en.wikipedia.org/wiki/Vibe_coding)
+
+- Vibe coding is **RECOMMENDED** when maintaining **the demo, the website, the UI and tests**.
+    - We have a [website/AGENTS.md](packages/website/AGENTS.md) for that.
+- Vibe coding is **NOT** allowed for the core lib!!!
+- NEVER try to vibe coding the MV3 extension!!! It is HELL.
 - Review anything AI wrote before make a commit. You are the author of anything you commit. NOT AI.
-- Update the AI instructions when structure changed.
-   - Cursor and Cline: `./.cursor/rules`
-   - Github Copilot: `./.github/copilot-instructions.md`
-   - Claude Code: `./CLAUDE.md`
 
-### Core Library (`src/`)
+If your AI assistant does not support [AGENTS.md](https://agents.md/). Add an alias for it:
 
-- **No React dependencies** - Pure JavaScript/TypeScript only
-- Use event bus for component communication
-- Follow browser-use patterns for DOM operations
+- claude-code (`CLAUDE.md`)
 
-### Doc&demo Site (`pages/`)
+    ```markdown
+    @AGENTS.md
+    ```
 
-- Use React 19 + TypeScript
-- Follow hash routing patterns (`useHashLocation`)
-- Use Tailwind CSS for styling
-- Add new docs pages to both router and sidebar
+- antigravity (`.agent/rules/alias.md`)
+
+    ```markdown
+    ---
+    trigger: always_on
+    ---
+
+    @../../AGENTS.md
+    ```
 
 ## 🔧 Development Workflows
 
-### Website Development
+### 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
+    ```
+
+- **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"
+    ```
+
+    > @see https://alibaba.github.io/page-agent/docs/features/models#ollama for configuration
+
+- **Restart the dev server** to load new env vars
+- If not provided, the demo will use the free testing proxy by default. By using it, you agree to its [terms](https://github.com/alibaba/page-agent/blob/main/docs/terms-and-privacy.md).
+
+### Extension Development
 
 ```bash
-npm start                # React development server
+# make sure you ran `npm run build:libs` first
+# and every time you changed the core libs
+npm run dev -w @page-agent/ext
+npm run zip -w @page-agent/ext
 ```
 
-### Core Lib Development and Testing
+- Update `packages/extension/docs/extension_api.md` for API integration details
 
-- Config your LLM API
-- Start a local script
+### Testing on Other Websites
 
-   ```bash
-   npm run build:lib:watch    # Auto-rebuild on changes
-   ```
+- Start and serve a local `iife` script
 
-- Add a new bookmark enable it on other website
+    ```bash
+    npm run dev:demo # Serving IIFE with auto rebuild at http://localhost:5174/page-agent.demo.js
+    ```
 
-   ```
-   javascript:(function(){var s=document.createElement('script');s.src=`http://localhost:5173/dist/lib/page-agent.umd.cjs?t=${Math.random()}`;s.onload=()=>console.log(%27PageAgent ready!%27);document.head.appendChild(s);})();
-   ```
+- Add a new bookmark
+
+    ```javascript
+    javascript:(function(){var s=document.createElement('script');s.src=`http://localhost:5174/page-agent.demo.js?t=${Math.random()}`;s.onload=()=>console.log(%27PageAgent ready!%27);document.head.appendChild(s);})();
+    ```
+
+- Click the bookmark on any page to load Page-Agent
+
+> Warning: AK in your local `.env` will be inlined in the iife script. Be very careful when you distribute the script.
 
 ### Adding Documentation
 
-1. Create `pages/docs/section/page-name/page.tsx`
-2. Add route to `pages/router.tsx`
-3. Add navigation link to `pages/components/DocsLayout.tsx`
+Ask an AI to help you add documentation to the `website/` package. Follow the existing style.
 
-## 🎯 Contribution Areas
-
-We especially welcome contributions in:
-
-- **Browser compatibility** improvements
-- **Performance optimizations** for DOM processing
-- **Documentation** and examples
-- **Testing** and quality assurance
-- **Accessibility** features
-- **Internationalization** support
+> Our AGENTS.md file and guardrails are designed for this purpose. But please be careful and review anything AI generated.
 
 ## 🚫 What We Don't Accept
 
-- Changes that break existing API compatibility
-- Heavy dependencies to core library
+- Breaking changes and large PRs without prior discussion
+- Heavy dependencies to core libs
 - Contributions without proper testing
 - Code that doesn't follow project conventions
+- Dependencies or code with licenses incompatible with MIT
+- Bot or AI-generated pull requests without meaningful human involvement
 
 ## 📄 Legal
 
 By contributing to this project, you agree that your contributions will be licensed under the MIT License.
 
-> 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
+> CLA is optional.
 
 ## 💬 Questions?
 
@@ -175,4 +202,4 @@ Parts of this project are derived from the [browser-use](https://github.com/brow
 - Check existing documentation and issues first
 - Be respectful and constructive in discussions
 
-Thank you for helping make Page-Agent better! 🎉
+Thank you for helping make PageAgent better! 🎉

LICENSE

@@ -1,6 +1,7 @@
 MIT License
 
-Copyright (c) 2025 Alibaba
+Copyright (c) 2026 SimonLuvRamen
+Copyright (c) 2026 Alibaba Group Holding Limited
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README-zh.md

@@ -1,128 +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)
-
-**让你的网页支持 AI 自动化。**
-
-运行在页面内的 UI agent. 使用自然语言操作 Web 应用。
-
-🌐 [English](./README.md) | **中文**
-
-👉 [🚀 **Demo**](https://alibaba.github.io/page-agent/) | [📖 **Documentation**](https://alibaba.github.io/page-agent/#/docs/introduction/overview)
-
----
-
-## ✨ 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**](./ROADMAP.md)
-
-## 🚀 快速开始
-
-### CDN 集成
-
-```html
-<!-- 临时 CDN URL. 未来会变更 -->
-<script
-	src="https://hwcxiuzfylggtcktqgij.supabase.co/storage/v1/object/public/demo-public/v0.0.2/page-agent.js"
-	crossorigin="true"
-	type="text/javascript"
-></script>
-```
-
-### NPM 安装
-
-```bash
-npm install page-agent
-```
-
-```javascript
-import { PageAgent } from 'page-agent'
-
-// 测试接口
-// @note: 限流，限制 prompt 内容，限制来源，随时变更，请替换成你自己的
-// @note: 使用 DeepSeek-chat(3.2) 官方版本，使用协议和隐私策略见 DeepSeek 网站
-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'
-
-const agent = new PageAgent({
-	modelName: DEMO_MODEL,
-	baseURL: DEMO_BASE_URL,
-	apiKey: DEMO_API_KEY,
-	language: 'zh-CN',
-})
-
-await agent.execute('点击登录按钮')
-```
-
-## 🏗️ 架构设计
-
-PageAgent 采用清晰的模块化架构：
-
-```
-src/
-├── PageAgent.ts          # Agent 主流程
-├── dom/                  # DOM 理解
-├── tools/                # 代理交互工具
-├── ui/                   # UI 组件和面板
-├── llms/                 # LLM 集成层
-└── utils/                # 事件总线和工具
-```
-
-## 🤝 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

@@ -1,44 +1,57 @@
-# PageAgent 🤖🪄
+# Page Agent
 
-![banner](https://img.alicdn.com/imgextra/i1/O1CN01RY0Wvh26ATVeDIX7v_!!6000000007621-0-tps-1672-512.jpg)
+<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-auto.svg)](https://opensource.org/licenses/MIT) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/) [![Bundle Size](https://img.shields.io/bundlephobia/minzip/page-agent)](https://bundlephobia.com/package/page-agent) [![Downloads](https://img.shields.io/npm/dt/page-agent.svg)](https://www.npmjs.com/package/page-agent) [![GitHub stars](https://img.shields.io/github/stars/alibaba/page-agent.svg)](https://github.com/alibaba/page-agent)
 
-**Transform your webpage into an AI-powered application with a single script tag.**
+The GUI Agent Living in Your Webpage. Control web interfaces with natural language.
 
-An in-page UI agent in javascript. Control web interfaces with natural language.
+🌐 **English** | [中文](./docs/README-zh.md)
 
-🌐 **English** | [中文](./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>📖 Docs</b></a> | <a href="https://news.ycombinator.com/item?id=47264138" target="_blank"><b>📢 HN Discussion</b></a> | <a href="https://x.com/simonluvramen" target="_blank"><b>𝕏 Follow on X</b></a>
 
-👉 [🚀 **Demo**](https://alibaba.github.io/page-agent/) | [📖 **Documentation**](https://alibaba.github.io/page-agent/#/docs/introduction/overview)
+<video id="demo-video" src="https://github.com/user-attachments/assets/a1f2eae2-13fb-4aae-98cf-a3fc1620a6c2" controls crossorigin muted></video>
 
 ---
 
 ## ✨ Features
 
-- **🎯 Easy Integration**
-- **🔐 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.
+- **📖 Text-based DOM manipulation**
+    - No screenshots. No multi-modal LLMs or special permissions needed.
+- **🧠 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**](./ROADMAP.md)
+- **SaaS AI Copilot** — Ship an AI copilot in your product in lines of code. No backend rewrite.
+- **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 own agent's reach across browser tabs with the optional [chrome extension](https://alibaba.github.io/page-agent/docs/features/chrome-extension).
 
 ## 🚀 Quick Start
 
-### CDN Integration
+### One-line integration
+
+Fastest way to try PageAgent with our free Demo LLM:
 
 ```html
-<!-- temporary CDN URL. May change in the future -->
-<script
-	src="https://hwcxiuzfylggtcktqgij.supabase.co/storage/v1/object/public/demo-public/v0.0.2/page-agent.js"
-	crossorigin="true"
-	type="text/javascript"
-></script>
+<script src="{URL}" crossorigin="true"></script>
 ```
 
+> **⚠️ 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).
+
+| Mirrors | URL                                                                                |
+| ------- | ---------------------------------------------------------------------------------- |
+| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.6.0/dist/iife/page-agent.demo.js         |
+| China   | https://registry.npmmirror.com/page-agent/1.6.0/files/dist/iife/page-agent.demo.js |
+
 ### NPM Installation
 
 ```bash
@@ -48,73 +61,39 @@ npm install page-agent
 ```javascript
 import { PageAgent } from 'page-agent'
 
-// test server
-// @note: rate limit. prompt limit. Origin limit. May change anytime. Use your own llm!
-// @note Using official DeepSeek-chat(3.2). Go to DeepSeek website for privacy policy.
-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'
-
 const agent = new PageAgent({
-	modelName: DEMO_MODEL,
-	baseURL: DEMO_BASE_URL,
-	apiKey: DEMO_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')
 ```
 
-## 🏗️ Structure
-
-PageAgent follows a clean, modular architecture:
-
-```
-src/
-├── PageAgent.ts          # Agent main loop
-├── dom/                  # DOM processing
-├── tools/                # Agent tools
-├── ui/                   # UI components & panels
-├── llms/                 # LLM integration layer
-└── utils/                # Event bus & utilities
-```
+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 setup and guidelines.
 
-### Setup
+Please read [Code of Conduct](docs/CODE_OF_CONDUCT.md) before contributing.
 
-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.
+Contributions generated entirely by bots or agents without substantial human involvement will not be accepted, and bot accounts may be blocked.
 
 ## 👏 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:
 
-Browser Use
+Browser Use <https://github.com/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.
@@ -123,6 +102,18 @@ 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!**
+
+<a href="https://www.star-history.com/?repos=alibaba%2Fpage-agent&type=date">
+ <picture>
+   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/image?repos=alibaba/page-agent&type=date&theme=dark&legend=top-left&v=7" />
+   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/image?repos=alibaba/page-agent&type=date&legend=top-left&v=7" />
+   <img alt="Star History Chart" src="https://api.star-history.com/image?repos=alibaba/page-agent&type=date&legend=top-left&v=7" />
+ </picture>
+</a>

ROADMAP.md

@@ -1,55 +0,0 @@
-# 🗺️ PageAgent Roadmap
-
-The development progress and future plans for PageAgent.
-
-## 🚀 Current Works
-
-- [x] **MVP** 
-  - Core functionality implemented.
-- [x] **SPA interaction** 
-- [x] **Reasoning and (short) memory**
-- [x] **Multi model provider integration and testing**
-- [x] **UI with HITL** 
-  - Human-in-the-loop user interface. Agent can ask user questions.
-- [x] **Landing and doc pages**
-- [x] **Remove `ai-sdk`** 
-  - Only one function of AI-ADK is being used.
-  - Our agent memory and thinking mechanism does not suite ai-sdk.
-- [x] **Robust LLM output**
-  - Auto-fix incomplete output format of DeepSeek and QWen.
-- [x] **Working homepage with live LLM API**
-- [x] **~~free~~ CDN**
-- [x] **Free evaluation plan**
-- [x] **Custom actions and HITL**
-- [ ] **Hooks and Events**
-  - [x] **lifecycle hooks**
-  - [ ] **lifecycle events**
-- [ ] **❗Pause and intervene** 
-  - Current pause does not allow user intervention.
-- [ ] **❗Hijack `page_open/page_change/page_unload` behavior**
-- [ ] **Custom knowledge base and instructions**
-- [ ] **Black/white-list safeguard**
-- [ ] **Data-masking**
-- [ ] **Optimize for popular UI frameworks**
-- [x] **i18n of the website**
-  - [x] Chinese version
-  - [x] English version
-- [ ] **Testing suits**
-- [ ] **Support custom llm fetch**
-- [ ] **Refactor: Separate `Agent` and `Page-Controller`** 
-  - Agent should be able to run w/o dom. 
-  - Actions should be able to be injected through iframe.
-
-♻️ Following browser-use's update and contribute back.
-
-## 📋 Pending Features
-
-- [ ] **Chrome-ext wrapper**
-- [ ] **Same-origin multi-page-app rally**
-- [ ] **Local MCP proxy**
-
-## 🤔 To Be Decided
-
-- [ ] **Cross-origin multi-page?** 
-  - Tricky
-  - Need some kind of "memory rally"

SECURITY.md

@@ -0,0 +1,50 @@
+# Security Policy
+
+## Supported Versions
+
+We provide security fixes on a best-effort basis for:
+
+| Version                                                   | Supported |
+| --------------------------------------------------------- | --------- |
+| `main`                                                    | Yes       |
+| Latest npm release of `page-agent` and workspace packages | Yes       |
+| Older releases                                            | No        |
+
+Please upgrade to the latest release before reporting an issue against an older build.
+
+## Reporting a Vulnerability
+
+Please do not report security vulnerabilities through public GitHub issues, discussions, or pull requests.
+
+Use GitHub's private vulnerability reporting flow:
+
+- Open https://github.com/alibaba/page-agent/security/policy
+- Click `Report a vulnerability`
+
+If private reporting is unavailable, open a minimal public issue only to request a private contact channel. Do not include exploit details.
+
+## What to Include
+
+- Affected package or feature
+- Exact version, commit, or build
+- Browser, OS, and runtime environment
+- Reproduction steps or a proof of concept
+- Expected impact
+
+## Scope
+
+We prioritize reports that show a real security boundary failure, such as:
+
+- Unauthorized access to data, tokens, or extension capabilities
+- Bypassing explicit safety constraints
+- Sensitive data exposure caused by default behavior
+
+The following usually do not qualify by themselves:
+
+- Unsafe custom integrations that ignore documented safeguards
+- Intentionally embedding secrets into client-side builds
+- Reports against unsupported older versions
+
+## Disclosure
+
+Please avoid public disclosure until maintainers have had a reasonable chance to investigate and ship a fix.

docs/CHANGELOG.md

@@ -0,0 +1,175 @@
+# 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).
+
+## [1.5.1] - 2026-03-05
+
+### Breaking Changes
+
+- **`data-browser-use-ignore` → `data-page-agent-ignore`** - DOM ignore attribute renamed to match the project identity
+- **Config types restructured** - `PageAgentConfig` split into `AgentConfig` + `PageAgentCoreConfig`; config definitions moved from `config/index.ts` to `types.ts`
+- **Zod v3/v4 dual support** - Libraries now accept both `zod@^3.25` and `zod@^4.0` as peer dependencies
+
+### Features
+
+- **Experimental `llms.txt` support** - Agent can fetch and include a site's `llms.txt` in context. Enable via `experimentalLlmsTxt: true`
+
+### Improvements
+
+- Default `maxSteps` changed from 20 to 40 for better for complex tasks out of the box
+- Added 400ms wait between agent steps for page reactions
+- Increased click wait time (100ms → 200ms) for more reliable interactions
+- Removed debug `console.log` statements from scroll actions
+- Reset observations on new task start
+- Improved logging across packages
+
+### Extension v0.1.9
+
+> PageAgent 1.5.1
+
+- **Advanced config panel** - New collapsible section exposing Max Steps, System Instruction, and experimental `llms.txt` toggle
+- Streamlined User Auth Token description
+- Moved testing API notice below auth token section
+
+---
+
+## [1.4.0] - 2026-02-27
+
+### Features
+
+- Update Terms of Use and Privacy Policy
+- **Robust tool-call validation** - Action inputs are now validated against tool schemas individually, producing clear error messages (e.g. `Invalid input for action "click_element_by_index"`) instead of unreadable union parse errors
+- **Primitive action input coercion** - Small models that output `{"click_element_by_index": 2}` instead of `{"click_element_by_index": {"index": 2}}` are now auto-corrected using tool schemas
+- **Qwen model updates** - Added `qwen3.5-plus` as the default free testing model; disabled `enable_thinking` for Qwen models to avoid incompatible responses
+- **Updated default LLM endpoint** - Migrated demo and extension to a new testing endpoint with legacy endpoint auto-migration
+
+### Improvements
+
+- Unified zod imports (`* as z`) across all packages for consistency
+- Better Zod error formatting with `z.prettifyError()` in LLM client
+- Exported `InvokeError` and `InvokeErrorType` as values (not just types) from `@page-agent/llms`
+- Exported `SupportedLanguage` type from `@page-agent/core`
+
+### Extension v0.1.8
+
+- **Language setting** - Added language selector (System / English / 中文) in config panel
+- **UI makeover** - New empty state with breathing glow and typing animation; ai-motion glow overlay while running; refined focus styles
+- **Testing endpoint notice** - Shows terms of use notice when using the free testing API
+- **Legacy endpoint migration** - Auto-migrates old Supabase testing endpoint to new endpoint on startup
+
+---
+
+## [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
+
+### 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 +1,117 @@
+# 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-auto.svg)](https://opensource.org/licenses/MIT) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/) [![Bundle Size](https://img.shields.io/bundlephobia/minzip/page-agent)](https://bundlephobia.com/package/page-agent) [![Downloads](https://img.shields.io/npm/dt/page-agent.svg)](https://www.npmjs.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>📖 Docs</b></a> | <a href="https://news.ycombinator.com/item?id=47264138" target="_blank"><b>📢 HN Discussion</b></a> | <a href="https://x.com/simonluvramen" target="_blank"><b>𝕏 Follow on X</b></a>
+
+<video id="demo-video" src="https://github.com/user-attachments/assets/a1f2eae2-13fb-4aae-98cf-a3fc1620a6c2" 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。
+- **📖 基于文本的 DOM 操作**
+    - 无需截图，无需多模态模型或特殊权限。
+- **🧠 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，无需重写后端。
+- **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)，让你自己的 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>
+```
+
+> **⚠️ 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)。
+
+| Mirrors | URL                                                                                |
+| ------- | ---------------------------------------------------------------------------------- |
+| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.6.0/dist/iife/page-agent.demo.js         |
+| China   | https://registry.npmmirror.com/page-agent/1.6.0/files/dist/iife/page-agent.demo.js |
+
+### 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) 了解安装与贡献指南。请在贡献前阅读[行为准则](CODE_OF_CONDUCT.md)。
+
+我们不接受未经实质性人类参与、完全由 Bot 或 Agent 自动生成的代码，机器人账号可能被禁止参与互动。
+
+## 👏 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 <https://github.com/browser-use/browser-use>
+Copyright (c) 2024 Gregor Zunic
+Licensed under the MIT License
+
+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！**
+
+<a href="https://www.star-history.com/?repos=alibaba%2Fpage-agent&type=date">
+ <picture>
+   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/image?repos=alibaba/page-agent&type=date&theme=dark&legend=top-left&v=7" />
+   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/image?repos=alibaba/page-agent&type=date&legend=top-left&v=7" />
+   <img alt="Star History Chart" src="https://api.star-history.com/image?repos=alibaba/page-agent&type=date&legend=top-left&v=7" />
+ </picture>
+</a>

docs/terms-and-privacy.md

@@ -0,0 +1,85 @@
+# Terms of Use & Privacy
+
+**Last updated:** March 2026
+
+"We" in this document refers to the maintainers of the open-source Page Agent project (https://github.com/alibaba/page-agent). "The software" refers to Page Agent (the JavaScript library) and Page Agent Ext (the browser extension). This document covers the software itself and the testing API we provide — **not** any third-party product or service built with it.
+
+---
+
+## 1. Open Source Software Privacy
+
+The software 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 we 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.
+
+The project is open source under the [MIT License](https://github.com/alibaba/page-agent/blob/main/LICENSE) and can be audited at: 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 the software.
+
+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 API, you agree to the following terms:
+
+- **Permitted Use Only**: This API must be used solely for technical evaluation of the software. Any other use — including integration into other products or services, unlawful activities, violation of the underlying LLM provider's usage policies, or automated scraping at scale — is strictly prohibited.
+
+- **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.
+
+- **Data Processing**: We do not store or log your prompts, webpage data (HTML), or any submitted content, nor do we use such data for model training. All data is processed in-transit and immediately discarded. We perform in-memory request validation to prevent abuse of the testing API, and temporarily process IP addresses for rate-limiting purposes. No data from these processes is retained. Data is processed through Alibaba Cloud infrastructure, which is subject to its own privacy policy.
+
+- **Independent Infrastructure**: The 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 purchased public cloud services from Alibaba Cloud China ([aliyun.com](https://www.aliyun.com) Function Compute and BaiLian Qwen models). This project is not a product of, 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 service.
+
+- **Recommendation for Real Usage**: For secure and continuous usage, we strongly advise using the BYOK mode with your own legally compliant commercial LLM API keys, or connecting to local, offline models (e.g., Ollama).
+
+**Note**: This free testing LLM API 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 API.
+
+**Age Requirement**: The software and testing API are not intended for use by individuals under the age of 13 (or the minimum age of digital consent in your jurisdiction).
+
+---
+
+## 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 HTML) of all pages under the extension's control
+
+are sent to the LLM API endpoint configured in **your settings**.
+
+> **Note:** The HTML 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 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` (or equivalent browser storage APIs)
+- **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 at our discretion.
+
+## Contact
+
+https://github.com/alibaba/page-agent/issues

env.d.ts

@@ -1,25 +0,0 @@
-/// <reference types="vite/client" />
-import type { PageAgent } from './src/PageAgent'
-
-declare module '*.module.css' {
-	const classes: Record<string, string>
-	export default classes
-}
-
-declare module '*.md?raw' {
-	const content: string
-	export default content
-}
-
-/**
- * for local dev and umd demo
- */
-
-declare global {
-	interface Window {
-		pageAgent?: PageAgent
-		PageAgent: typeof PageAgent
-
-		__PAGE_AGENT_IDS__: string[]
-	}
-}

eslint.config.js

@@ -8,7 +8,13 @@ import globals from 'globals'
 import tseslint from 'typescript-eslint'
 
 export default defineConfig([
-	globalIgnores(['dist', 'test-pages']),
+	globalIgnores([
+		'**/dist',
+		'**/node_modules',
+		'packages/*/src/components/ui',
+		'**/.wxt',
+		'**/.output',
+	]),
 	{
 		plugins: {
 			'react-hooks': reactHooks,
@@ -37,8 +43,10 @@ export default defineConfig([
 		],
 		languageOptions: {
 			parserOptions: {
-				project: ['./tsconfig.json'],
-				tsconfigRootDir: import.meta.dirname,
+				// project: ['./tsconfig.json'],
+				// project: ['./packages/*/tsconfig.json'],
+				// tsconfigRootDir: import.meta.dirname,
+				projectService: true,
 			},
 			ecmaVersion: 2020,
 			globals: globals.browser,
@@ -67,6 +75,11 @@ 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',
 		},
 	},
 ])

index.html

@@ -1,45 +0,0 @@
-<!doctype html>
-<html lang="zh-CN">
-	<head>
-		<meta charset="UTF-8" />
-		<link
-			rel="icon"
-			type="image/svg+xml"
-			href="https://img.alicdn.com/imgextra/i3/O1CN01uo9VaC20mamWNM2Zn_!!6000000006892-55-tps-64-64.svg"
-		/>
-		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
-		<title>PageAgent - AI-powered UI Agent in Your Webpage</title>
-		<meta
-			name="description"
-			content="PageAgent.js: One-line CDN import, add intelligent UI Agent to any website. Modern web AI automation with minimal integration."
-		/>
-		<meta
-			name="keywords"
-			content="PageAgent, AI Agent, Web Automation, UI Automation, Frontend, CDN, JavaScript, React, Vite, LLM"
-		/>
-		<meta name="theme-color" content="#58c0fc" />
-		<meta name="color-scheme" content="light dark" />
-		<meta name="author" content="PageAgent.js Team" />
-		<meta property="og:title" content="PageAgent.js - AI-powered UI Agent" />
-		<meta
-			property="og:description"
-			content="One-line CDN import, add intelligent UI Agent to any website."
-		/>
-		<meta property="og:type" content="website" />
-		<meta property="og:locale" content="en_US" />
-		<meta property="og:locale:alternate" content="zh_CN" />
-	</head>
-	<body>
-		<div id="root"></div>
-		<script type="module" src="./pages/main.tsx"></script>
-		<script>
-			// Dynamically update html lang attribute based on i18n detection
-			const updateHtmlLang = () => {
-				const lang = localStorage.getItem('i18nextLng') || navigator.language || 'zh-CN'
-				document.documentElement.lang = lang
-			}
-			updateHtmlLang()
-			window.addEventListener('storage', updateHtmlLang)
-		</script>
-	</body>
-</html>

package.json

@@ -1,134 +1,130 @@
 {
-	"name": "page-agent",
-	"private": false,
-	"version": "0.0.4",
-	"type": "module",
-	"main": "./dist/lib/page-agent.js",
-	"module": "./dist/lib/page-agent.js",
-	"types": "./dist/lib/PageAgent.d.ts",
-	"exports": {
-		".": {
-			"types": "./dist/lib/PageAgent.d.ts",
-			"import": "./dist/lib/page-agent.js",
-			"default": "./dist/lib/page-agent.js"
-		}
-	},
-	"files": [
-		"dist/lib/",
-		"README.md",
-		"LICENSE",
-		"NOTICE"
-	],
-	"description": "AI-powered UI agent for web applications - add intelligent automation to any webpage with a single script tag",
-	"keywords": [
-		"ai",
-		"automation",
-		"ui-agent",
-		"browser-automation",
-		"web-agent",
-		"llm",
-		"dom-interaction",
-		"intelligent-ui"
-	],
-	"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"
-	},
-	"scripts": {
-		"dev": "vite",
-		"start": "vite",
-		"build": "tsc -b && vite build && npm run build:lib && npm run build:umd",
-		"build:lib": "MODE=lib vite build",
-		"build:lib:watch": "MODE=lib vite build --watch",
-		"build:umd": "MODE=umd vite build",
-		"lint": "eslint .",
-		"prepare": "husky"
-	},
-	"dependencies": {
-		"ai-motion": "^0.4.7",
-		"chalk": "^5.6.2",
-		"zod": "^4.1.12"
-	},
-	"devDependencies": {
-		"@commitlint/cli": "^20.1.0",
-		"@commitlint/config-conventional": "^20.0.0",
-		"@eslint/js": "^9.37.0",
-		"@microsoft/api-extractor": "^7.53.1",
-		"@tailwindcss/vite": "^4.1.14",
-		"@trivago/prettier-plugin-sort-imports": "^5.2.2",
-		"@types/react": "^19.2.2",
-		"@types/react-dom": "^19.2.1",
-		"@vitejs/plugin-react-swc": "^4.1.0",
-		"dotenv": "^17.2.3",
-		"eslint": "^9.37.0",
-		"eslint-config-prettier": "^10.1.8",
-		"eslint-plugin-react-dom": "^2.0.6",
-		"eslint-plugin-react-hooks": "^7.0.0",
-		"eslint-plugin-react-refresh": "^0.4.23",
-		"eslint-plugin-react-x": "^2.0.6",
-		"globals": "^16.4.0",
-		"husky": "^9.1.7",
-		"i18next": "^25.6.0",
-		"i18next-browser-languagedetector": "^8.2.0",
-		"lint-staged": "^16.2.4",
-		"prettier": "^3.6.2",
-		"react": "^19.2.0",
-		"react-dom": "^19.2.0",
-		"react-i18next": "^16.1.4",
-		"tailwindcss": "^4.1.14",
-		"typescript": "^5.9.3",
-		"typescript-eslint": "^8.46.0",
-		"unplugin-dts": "^1.0.0-beta.6",
-		"vite": "^7.1.9",
-		"vite-plugin-css-injected-by-js": "^3.5.2",
-		"wouter": "^3.7.1"
-	},
-	"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": "1.6.0",
+    "type": "module",
+    "workspaces": [
+        "packages/page-controller",
+        "packages/ui",
+        "packages/llms",
+        "packages/core",
+        "packages/page-agent",
+        "packages/mcp",
+        "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": {
+        "start": "npm run dev --workspace=@page-agent/website",
+        "dev:ext": "npm run dev -w @page-agent/ext",
+        "dev:demo": "npm run dev:demo --workspace=page-agent",
+        "build": "npm run build:libs && npm run build:website",
+        "build:libs": "npm run build --workspaces --if-present",
+        "build:website": "npm run build:website --workspace=@page-agent/website",
+        "build:ext": "npm run build:libs && npm run zip -w @page-agent/ext",
+        "version": "node scripts/sync-version.js",
+        "lint": "eslint .",
+        "cleanup": "rm -rf packages/*/dist",
+        "prepare": "husky"
+    },
+    "devDependencies": {
+        "@commitlint/cli": "^20.5.0",
+        "@commitlint/config-conventional": "^20.5.0",
+        "@eslint/js": "^9.39.2",
+        "@microsoft/api-extractor": "^7.57.7",
+        "@tailwindcss/vite": "^4.2.1",
+        "@trivago/prettier-plugin-sort-imports": "^6.0.2",
+        "@types/node": "^25.5.0",
+        "@vitejs/plugin-react-swc": "^4.3.0",
+        "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": "^17.4.0",
+        "husky": "^9.1.7",
+        "lint-staged": "^16.4.0",
+        "prettier": "^3.8.0",
+        "typescript": "^5.9.3",
+        "typescript-eslint": "^8.57.1",
+        "unplugin-dts": "^1.0.0-beta.6",
+        "vite": "^7.3.1",
+        "vite-plugin-css-injected-by-js": "^4.0.1",
+        "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/core/package.json

@@ -0,0 +1,56 @@
+{
+    "name": "@page-agent/core",
+    "private": false,
+    "version": "1.6.0",
+    "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",
+        "@page-agent/llms": "1.6.0",
+        "@page-agent/page-controller": "1.6.0"
+    },
+    "peerDependencies": {
+        "zod": "^3.25.0 || ^4.0.0"
+    },
+    "devDependencies": {
+        "zod": "^4.3.5"
+    }
+}

packages/core/src/PageAgentCore.ts

@@ -0,0 +1,641 @@
+/**
+ * Copyright (C) 2025 Alibaba Group Holding Limited
+ * Copyright (C) 2026 SimonLuvRamen
+ * 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/v4'
+
+import SYSTEM_PROMPT from './prompts/system_prompt.md?raw'
+import { tools } from './tools'
+import type {
+	AgentActivity,
+	AgentConfig,
+	AgentReflection,
+	AgentStatus,
+	AgentStepEvent,
+	ExecutionResult,
+	HistoricalEvent,
+	MacroToolInput,
+	MacroToolResult,
+} from './types'
+import { assert, fetchLlmsTxt, normalizeResponse, uid, waitFor } from './utils'
+
+export { tool, type PageAgentTool } from './tools'
+export type * from './types'
+
+export type PageAgentCoreConfig = AgentConfig & { pageController: PageController }
+
+/**
+ * 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: PageAgentCoreConfig & { 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: PageAgentCoreConfig) {
+		super()
+
+		this.config = { ...config, maxSteps: config.maxSteps ?? 40 }
+
+		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 an 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()
+		this.#observations = []
+
+		// 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
+			}
+
+			await waitFor(this.config.stepDelay ?? 0.4)
+		}
+	}
+
+	/**
+	 * 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, experimentalLlmsTxt } = this.config
+
+		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
+				)
+			}
+		}
+
+		const llmsTxt = experimentalLlmsTxt && url ? await fetchLlmsTxt(url) : undefined
+
+		if (!systemInstructions && !pageInstructions && !llmsTxt) 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`
+		}
+
+		if (llmsTxt) {
+			result += `<llms_txt>\n${llmsTxt}\n</llms_txt>\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/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>
 
@@ -69,7 +69,7 @@ Strictly follow these rules while using the browser and navigating the web:
 - 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 a captcha appears, tell user you can not solve captcha. Finish 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.
@@ -87,12 +87,11 @@ Strictly follow these rules while using the browser and navigating the web:
 
 <capability>
 - You can only handle single page app. Do not jump out of current page.
-- Do not click on link if it will open in a new page (etc. <a target="_blank">)
+- Do not click on link if it will open in a new page (e.g., <a target="_blank">)
 - It is ok to fail the task.
 	- 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.
+	- Trying too hard can be harmful. Repeating some action back and forth or pushing for a complex procedure with little knowledge can cause unwanted results and harmful side-effects. User would rather you complete the task with a fail.
 - 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/v4'
+
+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 +1,289 @@
+import type { LLMConfig } from '@page-agent/llms'
+
+// @note circular dependency but okay
+import type { PageAgentCore } from './PageAgentCore'
+import type { PageAgentTool } from './tools'
+
+/** Supported UI languages */
+export type SupportedLanguage = 'en-US' | 'zh-CN'
+
+export interface AgentConfig extends LLMConfig {
+	language?: SupportedLanguage
+
+	/**
+	 * Maximum number of steps the agent can take per task.
+	 * @default 40
+	 */
+	maxSteps?: number
+
+	/**
+	 * Custom tools to extend PageAgent capabilities
+	 * @experimental
+	 * @note You can also override or remove internal tools by using the same name.
+	 * @see PageAgentTool
+	 *
+	 * @example
+	 * // override internal tool
+	 * import { z } from 'zod/v4'
+	 * import { tool } from 'page-agent'
+	 * const customTools = {
+	 * ask_user: tool({
+	 * 	description:
+	 * 		'Ask the user or parent model 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: PageAgent, input) {
+	 * 		const answer = await do_some_thing(input.question)
+	 * 		return "✅ Received user answer: " + answer
+	 * 	},
+	 * })
+	 * }
+	 *
+	 * @example
+	 * // remove internal tool
+	 * const customTools = {
+	 * 	ask_user: null // never ask user questions
+	 * }
+	 */
+	customTools?: Record<string, PageAgentTool | null>
+
+	/**
+	 * Instructions to guide the agent's behavior
+	 */
+	instructions?: {
+		/**
+		 * Global system-level instructions, applied to all tasks
+		 */
+		system?: string
+
+		/**
+		 * Dynamic page-level instructions callback
+		 * Called before each step to get instructions for the current page
+		 * @param url - Current page URL (window.location.href)
+		 * @returns Instructions string, or undefined/null to skip
+		 */
+		getPageInstructions?: (url: string) => string | undefined | null
+	}
+
+	/**
+	 * Lifecycle hooks for task execution.
+	 * @experimental API may change in future versions.
+	 *
+	 * All hooks receive the agent instance as first parameter.
+	 */
+
+	/**
+	 * Called before each step execution.
+	 * @experimental
+	 * @param agent - The PageAgentCore instance
+	 * @param stepCount - Current step number (0-indexed)
+	 */
+	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
+
+	/**
+	 * @experimental
+	 * Enable the experimental script execution tool that allows executing generated JavaScript code on the page.
+	 * @note Can cause unpredictable side effects.
+	 * @note May bypass some safe guards and data-masking mechanisms.
+	 */
+	experimentalScriptExecutionTool?: boolean
+
+	/**
+	 * @experimental
+	 * Fetch /llms.txt from current site origin and include as context.
+	 * Only fetched once per origin per task.
+	 * @default false
+	 */
+	experimentalLlmsTxt?: boolean
+
+	/**
+	 * Transform page content before sending to LLM.
+	 * Called after DOM extraction and simplification, before LLM invocation.
+	 * Use cases: inspect extraction results, modify page info, mask sensitive data.
+	 *
+	 * @param content - Simplified page content that will be sent to LLM
+	 * @returns Transformed content
+	 *
+	 * @example
+	 * // Mask phone numbers
+	 * transformPageContent: async (content) => {
+	 *   return content.replace(/1[3-9]\d{9}/g, '***********')
+	 * }
+	 */
+	transformPageContent?: (content: string) => Promise<string> | string
+
+	/**
+	 * Completely override the default system prompt.
+	 * @experimental Use with caution - incorrect prompts may break agent behavior.
+	 */
+	customSystemPrompt?: string
+
+	/**
+	 * Delay between steps in seconds.
+	 * @default 0.4
+	 */
+	stepDelay?: number
+}
+
+/**
+ * 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

@@ -0,0 +1,216 @@
+import { InvokeError, InvokeErrorType } from '@page-agent/llms'
+import chalk from 'chalk'
+import * as z from 'zod/v4'
+
+import type { PageAgentTool } from '../tools'
+
+const log = console.log.bind(console, chalk.yellow('[autoFixer]'))
+
+/**
+ * Normalize LLM response and fix common format issues.
+ *
+ * Handles:
+ * - No tool_calls but JSON in message.content (fallback)
+ * - Model returns action name as tool call instead of AgentOutput
+ * - 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, tools?: Map<string, PageAgentTool>): any {
+	let resolvedArguments = null as any
+
+	const choice = (response as { choices?: Choice[] }).choices?.[0]
+	if (!choice) throw new Error('No choices in response')
+
+	const message = choice.message
+	if (!message) throw new Error('No message in choice')
+
+	const toolCall = message.tool_calls?.[0]
+
+	// fix level and location of arguments
+
+	if (toolCall?.function?.arguments) {
+		resolvedArguments = safeJsonParse(toolCall.function.arguments)
+
+		// case: sometimes the model only returns the action level
+		if (toolCall.function.name && toolCall.function.name !== 'AgentOutput') {
+			log(`#1: fixing tool_call`)
+			resolvedArguments = { action: safeJsonParse(resolvedArguments) }
+		}
+	} else {
+		// case: sometimes the model returns json in content instead of tool_calls
+		if (message.content) {
+			const content = message.content.trim()
+			const jsonInContent = retrieveJsonFromString(content)
+			if (jsonInContent) {
+				resolvedArguments = safeJsonParse(jsonInContent)
+
+				// case: sometimes the content json includes upper level wrapper
+				if (resolvedArguments?.name === 'AgentOutput') {
+					log(`#2: fixing tool_call`)
+					resolvedArguments = safeJsonParse(resolvedArguments.arguments)
+				}
+
+				// case: sometimes even 2-levels of wrapping
+				if (resolvedArguments?.type === 'function') {
+					log(`#3: fixing tool_call`)
+					resolvedArguments = safeJsonParse(resolvedArguments.function.arguments)
+				}
+
+				// case: and sometimes action level only
+				// todo: needs better detection logic
+				if (
+					!resolvedArguments?.action &&
+					!resolvedArguments?.evaluation_previous_goal &&
+					!resolvedArguments?.memory &&
+					!resolvedArguments?.next_goal &&
+					!resolvedArguments?.thinking
+				) {
+					log(`#4: fixing tool_call`)
+					resolvedArguments = { action: safeJsonParse(resolvedArguments) }
+				}
+			} else {
+				throw new Error('No tool_call and the message content does not contain valid JSON')
+			}
+		} else {
+			throw new Error('No tool_call nor message content is present')
+		}
+	}
+
+	// fix double stringified arguments
+	resolvedArguments = safeJsonParse(resolvedArguments)
+	if (resolvedArguments.action) {
+		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) {
+		log(`#5: fixing tool_call`)
+		resolvedArguments.action = { name: 'wait', input: { seconds: 1 } }
+	}
+
+	// pack back to standard format
+	return {
+		...response,
+		choices: [
+			{
+				...choice,
+				message: {
+					...message,
+					tool_calls: [
+						{
+							...(toolCall || {}),
+							function: {
+								...(toolCall?.function || {}),
+								name: 'AgentOutput',
+								arguments: JSON.stringify(resolvedArguments),
+							},
+						},
+					],
+				},
+			},
+		],
+	}
+}
+
+/**
+ * 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: ${available}`
+		)
+	}
+
+	let value = action[toolName]
+	const schema = tool.inputSchema
+
+	// coerce primitive input for single-field tools
+	if (schema instanceof z.ZodObject && value !== null && typeof value !== 'object') {
+		const requiredKey = Object.keys(schema.shape).find(
+			(k) => !(schema.shape as Record<string, z.ZodType>)[k].safeParse(undefined).success
+		)
+		if (requiredKey) {
+			log(`coercing primitive action input for "${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.
+ */
+function safeJsonParse(input: any): any {
+	if (typeof input === 'string') {
+		try {
+			return JSON.parse(input.trim())
+		} catch {
+			return input
+		}
+	}
+	return input
+}
+
+/**
+ * Extract and parse JSON from a string.
+ * - Treat content between the first `{` and the last `}` as JSON.
+ * - Try to parse that content as JSON and return the parsed value (object/array/primitive) if successful, otherwise return null.
+ */
+function retrieveJsonFromString(str: string): any {
+	try {
+		const json = /({[\s\S]*})/.exec(str) ?? []
+		if (json.length === 0) {
+			return null
+		}
+		return JSON.parse(json[0]!)
+	} catch {
+		return null
+	}
+}
+
+interface Choice {
+	message?: {
+		role?: 'assistant'
+		content?: string
+		tool_calls?: {
+			id?: string
+			type?: 'function'
+			function?: {
+				name?: string
+				arguments?: string
+			}
+		}[]
+	}
+	index?: 0
+	finish_reason?: 'tool_calls'
+}

packages/core/src/utils/index.ts

@@ -0,0 +1,111 @@
+import chalk from 'chalk'
+
+export * from './autoFixer'
+
+export async function waitFor(seconds: number): Promise<void> {
+	await new Promise((resolve) => setTimeout(resolve, seconds * 1000))
+}
+
+//
+
+export function truncate(text: string, maxLength: number): string {
+	if (text.length > maxLength) {
+		return text.substring(0, maxLength) + '...'
+	}
+	return text
+}
+
+//
+
+export function randomID(existingIDs?: string[]): string {
+	let id = Math.random().toString(36).substring(2, 11)
+
+	if (!existingIDs) {
+		return id
+	}
+
+	const MAX_TRY = 1000
+	let tryCount = 0
+
+	while (existingIDs.includes(id)) {
+		id = Math.random().toString(36).substring(2, 11)
+		tryCount++
+		if (tryCount > MAX_TRY) {
+			throw new Error('randomID: too many tries')
+		}
+	}
+
+	return id
+}
+
+//
+const _global = globalThis as any
+
+if (!_global.__PAGE_AGENT_IDS__) {
+	_global.__PAGE_AGENT_IDS__ = []
+}
+
+const ids = _global.__PAGE_AGENT_IDS__
+
+/**
+ * Generate a random ID.
+ * @note Unique within this window.
+ */
+export function uid() {
+	const id = randomID(ids)
+	ids.push(id)
+	return id
+}
+
+const llmsTxtCache = new Map<string, string | null>()
+
+/** Fetch /llms.txt for a URL's origin. Cached per origin, `null` = tried and not found. */
+export async function fetchLlmsTxt(url: string): Promise<string | null> {
+	let origin: string
+	try {
+		origin = new URL(url).origin
+	} catch {
+		return null // Invalid URL
+	}
+	// about:blank, data:, file:
+	if (origin === 'null') return null
+
+	if (llmsTxtCache.has(origin)) return llmsTxtCache.get(origin)!
+
+	const endpoint = `${origin}/llms.txt`
+	let result: string | null = null
+	try {
+		console.log(chalk.gray(`[llms.txt] Fetching ${endpoint}`))
+		const res = await fetch(endpoint, { signal: AbortSignal.timeout(3000) })
+		if (res.ok) {
+			result = await res.text()
+			console.log(chalk.green(`[llms.txt] Found (${result.length} chars)`))
+			if (result.length > 1000) {
+				console.log(chalk.yellow(`[llms.txt] Truncating to 1000 chars`))
+				result = truncate(result, 1000)
+			}
+		} else {
+			console.debug(chalk.gray(`[llms.txt] ${res.status} for ${endpoint}`))
+		}
+	} catch (e) {
+		console.debug(chalk.gray(`[llms.txt] not found for ${endpoint}`), e)
+	}
+	llmsTxtCache.set(origin, result)
+	return result
+}
+
+/**
+ * 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 +1,45 @@
+// @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',
+				'zod/v4',
+				// 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/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
+  model: string
+  apiKey?: 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
+  model: string
+  apiKey?: 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 +1,50 @@
+{
+    "name": "@page-agent/ext",
+    "private": true,
+    "version": "1.6.0",
+    "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",
+        "@types/chrome": "^0.1.37",
+        "@types/react": "^19.2.14",
+        "@types/react-dom": "^19.2.1",
+        "@wxt-dev/module-react": "^1.2.2",
+        "class-variance-authority": "^0.7.1",
+        "clsx": "^2.1.1",
+        "idb": "^8.0.3",
+        "lucide-react": "^0.577.0",
+        "motion": "^12.37.0",
+        "next-themes": "^0.4.6",
+        "react": "^19.2.4",
+        "react-dom": "^19.2.4",
+        "rough-notation": "^0.5.1",
+        "simple-icons": "^16.12.0",
+        "sonner": "^2.0.7",
+        "tailwind-merge": "^3.5.0",
+        "tailwindcss": "^4.1.14",
+        "tw-animate-css": "^1.4.0",
+        "wxt": "^0.20.19"
+    },
+    "dependencies": {
+        "@page-agent/core": "1.6.0",
+        "@page-agent/llms": "1.6.0",
+        "@page-agent/page-controller": "1.6.0",
+        "@page-agent/ui": "1.6.0",
+        "ai-motion": "^0.4.8",
+        "chalk": "^5.6.2"
+    },
+    "peerDependencies": {
+        "zod": "^3.25.0 || ^4.0.0"
+    }
+}

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 +1,97 @@
+import { type AgentConfig, 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: AgentConfig & { 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) => {
+				if (!tabsController.currentTabId) return
+				// 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 +1,196 @@
+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> {
+		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.
+ */
+export 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 })
+				})
+				.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 })
+				.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 +1,350 @@
+import { isContentScriptAllowed } from './RemotePageController'
+
+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 = ''
+
+	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
+
+		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) {
+			const info = await sendMessage({
+				type: 'TAB_CONTROL',
+				action: 'get_tab_info',
+				payload: { tabId: this.initialTabId },
+			})
+
+			if (isContentScriptAllowed(info.url)) {
+				this.currentTabId = this.initialTabId
+
+				this.tabs.push({
+					id: result.tabId,
+					isInitial: true,
+					url: info.url,
+					title: info.title,
+					status: info.status,
+				})
+
+				await this.createTabGroup([this.initialTabId])
+			}
+		}
+
+		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
+
+		this.tabs.push({
+			id: tabId,
+			isInitial: false,
+		})
+
+		await this.switchToTab(tabId)
+
+		if (!this.tabGroupId) {
+			await this.createTabGroup([tabId])
+		} 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}`)
+		}
+	}
+
+	private async createTabGroup(tabIds: number[]) {
+		const result = await sendMessage({
+			type: 'TAB_CONTROL',
+			action: 'create_tab_group',
+			payload: { tabIds },
+		})
+
+		if (!result?.success) {
+			throw new Error(`Failed to create tab group: ${result?.error}`)
+		}
+
+		this.tabGroupId = result.groupId as number
+
+		await sendMessage({
+			type: 'TAB_CONTROL',
+			action: 'update_tab_group',
+			payload: {
+				groupId: this.tabGroupId,
+				properties: {
+					title: `PageAgent(${this.task})`,
+					color: randomColor(),
+					collapsed: false,
+				},
+			},
+		})
+	}
+
+	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 = ['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 = {
+	baseURL: DEMO_BASE_URL,
+	model: DEMO_MODEL,
+	// apiKey: DEMO_API_KEY,
+}
+
+/** 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. Finish 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/v4'
+
+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 +1,159 @@
+/**
+ * React hook for using AgentController
+ */
+import type {
+	AgentActivity,
+	AgentStatus,
+	ExecutionResult,
+	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 AdvancedConfig {
+	maxSteps?: number
+	systemInstruction?: string
+	experimentalLlmsTxt?: boolean
+	disableNamedToolChoice?: boolean
+}
+
+export interface ExtConfig extends LLMConfig, AdvancedConfig {
+	language?: LanguagePreference
+}
+
+export interface UseAgentResult {
+	status: AgentStatus
+	history: HistoricalEvent[]
+	activity: AgentActivity | null
+	currentTask: string
+	config: ExtConfig | null
+	execute: (task: string) => Promise<ExecutionResult>
+	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', 'advancedConfig']).then((result) => {
+			let llmConfig = (result.llmConfig as LLMConfig) ?? DEMO_CONFIG
+			const language = (result.language as SupportedLanguage) || undefined
+			const advancedConfig = (result.advancedConfig as AdvancedConfig) ?? {}
+
+			// 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, ...advancedConfig, language })
+		})
+	}, [])
+
+	useEffect(() => {
+		if (!config) return
+
+		const { systemInstruction, ...agentConfig } = config
+		const agent = new MultiPageAgent({
+			...agentConfig,
+			instructions: systemInstruction ? { system: systemInstruction } : undefined,
+		})
+		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([])
+		return agent.execute(task)
+	}, [])
+
+	const stop = useCallback(() => {
+		agentRef.current?.stop()
+	}, [])
+
+	const configure = useCallback(
+		async ({
+			language,
+			maxSteps,
+			systemInstruction,
+			experimentalLlmsTxt,
+			disableNamedToolChoice,
+			...llmConfig
+		}: ExtConfig) => {
+			await chrome.storage.local.set({ llmConfig })
+			if (language) {
+				await chrome.storage.local.set({ language })
+			} else {
+				await chrome.storage.local.remove('language')
+			}
+			const advancedConfig: AdvancedConfig = {
+				maxSteps,
+				systemInstruction,
+				experimentalLlmsTxt,
+				disableNamedToolChoice,
+			}
+			await chrome.storage.local.set({ advancedConfig })
+			setConfig({ ...llmConfig, ...advancedConfig, 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/ConfigPanel.tsx

@@ -0,0 +1,363 @@
+import {
+	Copy,
+	CornerUpLeft,
+	ExternalLink,
+	Eye,
+	EyeOff,
+	FoldVertical,
+	HatGlasses,
+	Home,
+	Loader2,
+	Scale,
+	UnfoldVertical,
+} from 'lucide-react'
+import { useEffect, useState } from 'react'
+import { siGithub } from 'simple-icons'
+
+import { 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'
+import { Switch } from '@/components/ui/switch'
+
+interface ConfigPanelProps {
+	config: ExtConfig | null
+	onSave: (config: ExtConfig) => Promise<void>
+	onClose: () => void
+}
+
+export function ConfigPanel({ config, onSave, onClose }: ConfigPanelProps) {
+	const [baseURL, setBaseURL] = useState(config?.baseURL || DEMO_BASE_URL)
+	const [model, setModel] = useState(config?.model || DEMO_MODEL)
+	const [apiKey, setApiKey] = useState(config?.apiKey)
+	const [language, setLanguage] = useState<LanguagePreference>(config?.language)
+	const [maxSteps, setMaxSteps] = useState<number | undefined>(config?.maxSteps)
+	const [systemInstruction, setSystemInstruction] = useState(config?.systemInstruction ?? '')
+	const [experimentalLlmsTxt, setExperimentalLlmsTxt] = useState(
+		config?.experimentalLlmsTxt ?? false
+	)
+	const [disableNamedToolChoice, setDisableNamedToolChoice] = useState(
+		config?.disableNamedToolChoice ?? false
+	)
+	const [advancedOpen, setAdvancedOpen] = useState(false)
+	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)
+
+	useEffect(() => {
+		setBaseURL(config?.baseURL || DEMO_BASE_URL)
+		setModel(config?.model || DEMO_MODEL)
+		setApiKey(config?.apiKey)
+		setLanguage(config?.language)
+		setMaxSteps(config?.maxSteps)
+		setSystemInstruction(config?.systemInstruction ?? '')
+		setExperimentalLlmsTxt(config?.experimentalLlmsTxt ?? false)
+		setDisableNamedToolChoice(config?.disableNamedToolChoice ?? false)
+	}, [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,
+				maxSteps: maxSteps || undefined,
+				systemInstruction: systemInstruction || undefined,
+				experimentalLlmsTxt,
+				disableNamedToolChoice,
+			})
+		} 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>
+
+			{/* 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">
+					Give a website the ability 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>
+
+			{/* Hub link */}
+			<a
+				href="/hub.html"
+				target="_blank"
+				className="flex items-center justify-between p-3 rounded-md border bg-muted/50 text-xs font-medium text-muted-foreground hover:text-foreground hover:border-foreground/20 transition-colors"
+			>
+				Manage Page Agent Hub
+				<ExternalLink className="size-3" />
+			</a>
+
+			<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>
+
+			{/* Testing API notice */}
+			{isTestingEndpoint(baseURL) && (
+				<div className="p-2.5 rounded-md border border-amber-500/30 bg-amber-500/5 text-[11px] text-muted-foreground leading-relaxed">
+					<Scale className="size-3 inline-block mr-1 -mt-0.5 text-amber-600" />
+					You are using our testing API. By using this 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>
+				</div>
+			)}
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">Model</label>
+				<Input
+					placeholder="gpt-5.1"
+					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">Response 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>
+
+			{/* Advanced Config */}
+			<button
+				type="button"
+				onClick={() => setAdvancedOpen(!advancedOpen)}
+				className="flex items-center gap-1 text-xs text-muted-foreground hover:text-foreground cursor-pointer mt-1 font-bold"
+			>
+				Advanced
+				{advancedOpen ? <FoldVertical className="size-3" /> : <UnfoldVertical className="size-3" />}
+			</button>
+
+			{advancedOpen && (
+				<>
+					<div className="flex flex-col gap-1.5">
+						<label className="text-xs text-muted-foreground">Max Steps</label>
+						<Input
+							type="number"
+							placeholder="40"
+							min={1}
+							max={200}
+							value={maxSteps ?? ''}
+							onChange={(e) => setMaxSteps(e.target.value ? Number(e.target.value) : undefined)}
+							className="text-xs h-8 [&::-webkit-inner-spin-button]:appearance-none [&::-webkit-outer-spin-button]:appearance-none [-moz-appearance:textfield]"
+						/>
+					</div>
+
+					<div className="flex flex-col gap-1.5">
+						<label className="text-xs text-muted-foreground">System Instruction</label>
+						<textarea
+							placeholder="Additional instructions for the agent..."
+							value={systemInstruction}
+							onChange={(e) => setSystemInstruction(e.target.value)}
+							rows={3}
+							className="text-xs rounded-md border border-input bg-background px-3 py-2 resize-y min-h-[60px]"
+						/>
+					</div>
+
+					<label className="flex items-center justify-between cursor-pointer">
+						<span className="text-xs text-muted-foreground">Disable named tool_choice</span>
+						<Switch checked={disableNamedToolChoice} onCheckedChange={setDisableNamedToolChoice} />
+					</label>
+
+					<label className="flex items-center justify-between cursor-pointer">
+						<span className="text-xs text-muted-foreground">Experimental llms.txt support</span>
+						<Switch checked={experimentalLlmsTxt} onCheckedChange={setExperimentalLlmsTxt} />
+					</label>
+				</>
+			)}
+
+			<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">
+					<span>
+						Version <span className="font-mono">v{__VERSION__}</span>
+					</span>
+
+					<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>
+				</div>
+
+				<div className="flex flex-col items-end">
+					<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</span>
+					</a>
+				</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/components/ErrorBoundary.tsx

@@ -0,0 +1,60 @@
+import { AlertTriangle, Eraser, 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()
+	}
+
+	handleResetConfig = async () => {
+		await chrome.storage.local.remove(['llmConfig', 'language', 'advancedConfig'])
+		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>
+				<div className="flex gap-2">
+					<Button variant="outline" size="sm" onClick={this.handleResetConfig}>
+						<Eraser className="size-3.5 mr-2" />
+						Reset Config
+					</Button>
+					<Button variant="outline" size="sm" onClick={this.handleReload}>
+						<RotateCcw className="size-3.5 mr-2" />
+						Reload Panel
+					</Button>
+				</div>
+			</div>
+		)
+	}
+}

packages/extension/src/components/HistoryDetail.tsx

@@ -0,0 +1,80 @@
+import { ArrowLeft, RotateCcw, Trash2 } from 'lucide-react'
+import { useEffect, useState } from 'react'
+
+import { Button } from '@/components/ui/button'
+import { type SessionRecord, deleteSession, getSession } from '@/lib/db'
+
+import { EventCard } from './cards'
+
+export function HistoryDetail({
+	sessionId,
+	onBack,
+	onRerun,
+}: {
+	sessionId: string
+	onBack: () => void
+	onRerun: (task: string) => 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 className="mt-2 flex items-center gap-2">
+					<button
+						type="button"
+						onClick={() => onRerun(session.task)}
+						className="flex items-center gap-1 text-[10px] text-muted-foreground hover:text-foreground transition-colors cursor-pointer disabled:opacity-50 disabled:cursor-not-allowed"
+					>
+						<RotateCcw className="size-3" />
+						Run again
+					</button>
+					<button
+						type="button"
+						onClick={async () => {
+							await deleteSession(sessionId)
+							onBack()
+						}}
+						className="flex items-center gap-1 text-[10px] text-muted-foreground hover:text-destructive transition-colors cursor-pointer"
+					>
+						<Trash2 className="size-3" />
+						Delete
+					</button>
+				</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/components/HistoryList.tsx

@@ -0,0 +1,153 @@
+import { ArrowDownToLine, ArrowLeft, CheckCircle, RotateCcw, 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'
+import { downloadHistoryExport } from '@/lib/history-export'
+
+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,
+	onRerun,
+}: {
+	onSelect: (id: string) => void
+	onBack: () => void
+	onRerun: (task: string) => 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))
+	}
+
+	const handleExport = (e: React.MouseEvent, session: SessionRecord) => {
+		e.stopPropagation()
+		downloadHistoryExport(session.task, session.createdAt, session.history)
+	}
+
+	const handleRerun = (e: React.MouseEvent, task: string) => {
+		e.stopPropagation()
+		onRerun(task)
+	}
+
+	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)}
+						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>
+							<div className="flex items-center mt-0.5">
+								<p className="text-[10px] text-muted-foreground">
+									{timeAgo(session.createdAt)} · {session.history.length} steps
+								</p>
+								<div className="flex items-center gap-0.5 ml-auto opacity-0 group-hover:opacity-100 transition-opacity">
+									<button
+										type="button"
+										onClick={(e) => handleRerun(e, session.task)}
+										className="p-0.5 text-muted-foreground hover:text-foreground transition-colors cursor-pointer"
+										title="Run task again"
+										aria-label={`Run history task again: ${session.task}`}
+									>
+										<RotateCcw className="size-3" />
+									</button>
+									<button
+										type="button"
+										onClick={(e) => handleExport(e, session)}
+										className="p-1 text-muted-foreground hover:text-foreground transition-colors cursor-pointer"
+										title="Export history JSON"
+										aria-label={`Export history for ${session.task}`}
+									>
+										<ArrowDownToLine className="size-3" />
+									</button>
+									<button
+										type="button"
+										onClick={(e) => handleDelete(e, session.id)}
+										className="p-0.5 text-muted-foreground hover:text-destructive transition-colors cursor-pointer"
+										title="Delete history"
+										aria-label={`Delete history for ${session.task}`}
+									>
+										<Trash2 className="size-3" />
+									</button>
+								</div>
+							</div>
+						</div>
+					</div>
+				))}
+			</div>
+		</div>
+	)
+}

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

@@ -0,0 +1,152 @@
+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(() => {
+		try {
+			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!)
+		} catch (e) {
+			console.warn('[MotionOverlay] Motion unavailable:', e)
+		}
+
+		return () => {
+			motionRef.current?.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 overflow-hidden"
+			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/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 cursor-pointer 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 +1,63 @@
+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
+		}
+	})
+
+	// external messages (from localhost launcher page via externally_connectable)
+
+	chrome.runtime.onMessageExternal.addListener((message, sender, sendResponse) => {
+		if (message.type === 'OPEN_HUB') {
+			openOrFocusHubTab(message.wsPort).then(() => {
+				if (sender.tab?.id) chrome.tabs.remove(sender.tab.id)
+				sendResponse({ ok: true })
+			})
+			return true
+		}
+	})
+
+	// setup
+
+	chrome.sidePanel.setPanelBehavior({ openPanelOnActionClick: true }).catch(() => {})
+})
+
+async function openOrFocusHubTab(wsPort: number) {
+	const hubUrl = chrome.runtime.getURL('hub.html')
+	const existing = await chrome.tabs.query({ url: `${hubUrl}*` })
+
+	if (existing.length > 0 && existing[0].id) {
+		await chrome.tabs.update(existing[0].id, {
+			active: true,
+			url: `${hubUrl}?ws=${wsPort}`,
+		})
+		return
+	}
+
+	await chrome.tabs.create({ url: `${hubUrl}?ws=${wsPort}`, pinned: true })
+}

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/hub/App.tsx

@@ -0,0 +1,251 @@
+import { FoldVertical, Plug, PlugZap, Square, UnfoldVertical, Unplug } from 'lucide-react'
+import { useEffect, useRef, useState } from 'react'
+
+import { useAgent } from '@/agent/useAgent'
+import { ActivityCard, EventCard } from '@/components/cards'
+import { Logo, MotionOverlay, StatusDot } from '@/components/misc'
+import { Button } from '@/components/ui/button'
+import { Switch } from '@/components/ui/switch'
+
+import { useHubWs } from './hub-ws'
+
+export default function App() {
+	const { status, history, activity, currentTask, config, execute, stop, configure } = useAgent()
+	const { wsState } = useHubWs(execute, stop, configure, config)
+
+	const historyRef = useRef<HTMLDivElement>(null)
+
+	useEffect(() => {
+		if (historyRef.current) {
+			historyRef.current.scrollTop = historyRef.current.scrollHeight
+		}
+	}, [history, activity])
+
+	const isRunning = status === 'running'
+	const WsIcon = wsState === 'connected' ? PlugZap : wsState === 'connecting' ? Plug : Unplug
+	const wsLabel = {
+		connected: 'Connected',
+		connecting: 'Connecting…',
+		disconnected: new URLSearchParams(location.search).get('ws') ? 'Disconnected' : 'No connection',
+	}[wsState]
+
+	return (
+		<div className="flex h-screen bg-background">
+			{/* Left — Protocol docs */}
+			<aside className="w-80 shrink-0 border-r flex flex-col bg-muted/20">
+				<a
+					href="https://alibaba.github.io/page-agent/"
+					target="_blank"
+					rel="noopener noreferrer"
+					className="flex items-center gap-2 px-5 h-12 border-b hover:bg-muted/30 transition-colors"
+				>
+					<Logo className="size-5" />
+					<span className="text-sm font-semibold tracking-tight">Page Agent Hub</span>
+					<span className="text-[9px] font-medium uppercase tracking-wider text-amber-600 bg-amber-500/10 border border-amber-500/30 rounded px-1.5 py-0.5">
+						Beta
+					</span>
+				</a>
+
+				<div className="flex-1 overflow-y-auto px-5 py-4 space-y-6">
+					<div className="text-xs text-muted-foreground leading-relaxed space-y-2">
+						<p>
+							Page Agent Hub lets local apps (e.g. MCP servers) control the Page Agent extension via
+							WebSocket.
+						</p>
+						<p>
+							Check out the official{' '}
+							<a
+								href="https://github.com/alibaba/page-agent/tree/main/packages/mcp"
+								target="_blank"
+								rel="noopener noreferrer"
+								className="underline hover:text-foreground"
+							>
+								MCP server package
+							</a>
+							.
+						</p>
+					</div>
+
+					<HubConfig />
+
+					<ProtocolDocsCollapsible />
+				</div>
+
+				<div className="border-t px-5 py-3 text-[10px] text-muted-foreground/60 flex items-center justify-between">
+					<span className="font-mono">v{__VERSION__}</span>
+					<span>
+						Built with ♥️ by{' '}
+						<a
+							href="https://github.com/gaomeng1900"
+							target="_blank"
+							rel="noopener noreferrer"
+							className="underline hover:text-foreground"
+						>
+							@Simon
+						</a>
+					</span>
+				</div>
+			</aside>
+
+			{/* Right — Live session */}
+			<main className="flex-1 flex flex-col min-w-0 relative">
+				<MotionOverlay active={isRunning} />
+
+				<header className="flex items-center justify-between border-b px-5 h-12">
+					<div className="flex items-center gap-2 text-xs text-muted-foreground">
+						<WsIcon className="size-3.5" />
+						<span>{wsLabel}</span>
+					</div>
+					<div className="flex items-center gap-3">
+						<StatusDot status={status} />
+						{isRunning && (
+							<Button variant="destructive" size="sm" onClick={stop} className="h-7 text-xs">
+								<Square className="size-3 mr-1" />
+								Stop
+							</Button>
+						)}
+					</div>
+				</header>
+
+				{/* Task banner */}
+				{currentTask && (
+					<div className="border-b px-5 py-2 bg-muted/30">
+						<div className="text-[10px] text-muted-foreground uppercase tracking-wide">
+							Current Task
+						</div>
+						<div className="text-sm font-medium truncate" title={currentTask}>
+							{currentTask}
+						</div>
+					</div>
+				)}
+
+				{/* Event stream */}
+				<div ref={historyRef} className="flex-1 overflow-y-auto p-5 space-y-2">
+					{!currentTask && history.length === 0 && !isRunning && (
+						<div className="flex flex-col items-center justify-center h-full text-muted-foreground gap-3">
+							<WsIcon className="size-10 opacity-30" />
+							<p className="text-sm">
+								{wsState === 'connected'
+									? 'Waiting for task from external caller…'
+									: 'No active session'}
+							</p>
+						</div>
+					)}
+
+					{history.map((event, index) => (
+						// eslint-disable-next-line react-x/no-array-index-key
+						<EventCard key={index} event={event} />
+					))}
+
+					{activity && <ActivityCard activity={activity} />}
+				</div>
+			</main>
+		</div>
+	)
+}
+
+function HubConfig() {
+	const [allowAll, setAllowAll] = useState(false)
+
+	useEffect(() => {
+		chrome.storage.local.get('allowAllHubConnection').then((r) => {
+			setAllowAll(r.allowAllHubConnection === true)
+		})
+	}, [])
+
+	const toggle = (checked: boolean) => {
+		setAllowAll(checked)
+		chrome.storage.local.set({ allowAllHubConnection: checked })
+	}
+
+	return (
+		<div>
+			<h3 className="text-[11px] font-semibold text-foreground/80 uppercase tracking-wider mb-2">
+				Config
+			</h3>
+			<div className="group/hub relative">
+				<label
+					className={`flex items-center justify-between p-3 rounded-md border cursor-pointer text-xs ${allowAll ? 'bg-amber-500/10 border-amber-500/30 text-amber-600' : 'bg-muted/50 text-muted-foreground'}`}
+				>
+					Auto-approve connections
+					<Switch
+						checked={allowAll}
+						onCheckedChange={toggle}
+						className={allowAll ? 'data-[state=checked]:bg-amber-500' : ''}
+					/>
+				</label>
+
+				{/* hide with invisible absolute opacity-0*/}
+				<div className="group-hover/hub:visible group-hover/hub:opacity-100 transition-opacity duration-150  left-0 right-0 top-full z-10 pt-2">
+					<div className="relative p-2.5 rounded-md border border-border bg-background/60 backdrop-blur-md shadow-2xl text-muted-foreground text-xs leading-relaxed">
+						<div className="absolute -top-1.5 left-5 size-3 rotate-45 rounded-[1px] border-l border-t border-border bg-background/60 backdrop-blur-md" />
+						By default, each connection requires your approval before running tasks. <br />
+						Enable this to skip per-session approval.
+						<br />
+						<span className="font-semibold">* Use with caution!</span>
+					</div>
+				</div>
+			</div>
+		</div>
+	)
+}
+
+function ProtocolDocsCollapsible() {
+	const [open, setOpen] = useState(false)
+
+	return (
+		<div>
+			<button
+				type="button"
+				onClick={() => setOpen(!open)}
+				className="flex items-center gap-1 text-[11px] font-semibold text-foreground/80 uppercase tracking-wider cursor-pointer"
+			>
+				Docs
+				{open ? <FoldVertical className="size-3" /> : <UnfoldVertical className="size-3" />}
+			</button>
+
+			{open && (
+				<div className="mt-3 space-y-4 text-xs text-muted-foreground">
+					<p className="text-[10px]">
+						Connect via <code className="text-[10px]">hub.html?ws=PORT</code>
+					</p>
+
+					<section>
+						<h4 className="text-[11px] font-medium text-foreground/60 mb-1.5">Flow</h4>
+						<ol className="list-decimal list-inside space-y-1 text-[11px] leading-relaxed">
+							<li>Hub opens WS to caller's server</li>
+							<li>
+								Sends <code className="text-[10px]">ready</code>
+							</li>
+							<li>
+								Caller sends <code className="text-[10px]">execute</code> with task
+							</li>
+							<li>Hub runs agent, streams events</li>
+							<li>
+								Hub sends <code className="text-[10px]">result</code> or{' '}
+								<code className="text-[10px]">error</code>
+							</li>
+						</ol>
+					</section>
+
+					<section>
+						<h4 className="text-[11px] font-medium text-foreground/60 mb-1.5">Caller → Hub</h4>
+						<pre className="bg-muted/50 rounded-md p-3 font-mono text-[10px] leading-relaxed whitespace-pre-wrap">
+							{`{ type: "execute", task: string, config?: object }
+{ type: "stop" }`}
+						</pre>
+					</section>
+
+					<section>
+						<h4 className="text-[11px] font-medium text-foreground/60 mb-1.5">Hub → Caller</h4>
+						<pre className="bg-muted/50 rounded-md p-3 font-mono text-[10px] leading-relaxed whitespace-pre-wrap">
+							{`{ type: "ready" }
+{ type: "result", success: boolean, data: string }
+{ type: "error", message: string }`}
+						</pre>
+					</section>
+				</div>
+			)}
+		</div>
+	)
+}

packages/extension/src/entrypoints/hub/hub-ws.ts

@@ -0,0 +1,243 @@
+/**
+ * Hub WebSocket Protocol
+ *
+ * Hub connects as WS client to `ws://localhost:{port}`.
+ * All messages are JSON. One task at a time.
+ *
+ * Inbound (Caller → Hub):
+ *   { type: "execute", task: string, config?: object }
+ *   { type: "stop" }
+ *
+ * Outbound (Hub → Caller):
+ *   { type: "ready" }
+ *   { type: "result", success: boolean, data: string }
+ *   { type: "error", message: string }
+ */
+import type { ExecutionResult } from '@page-agent/core'
+import { useEffect, useRef, useState } from 'react'
+
+import type { ExtConfig } from '@/agent/useAgent'
+
+// --- Protocol types ---
+
+interface ExecuteMessage {
+	type: 'execute'
+	task: string
+	config?: Record<string, unknown>
+}
+
+interface StopMessage {
+	type: 'stop'
+}
+
+type InboundMessage = ExecuteMessage | StopMessage
+
+interface ReadyMessage {
+	type: 'ready'
+}
+
+interface ResultMessage {
+	type: 'result'
+	success: boolean
+	data: string
+}
+
+interface ErrorMessage {
+	type: 'error'
+	message: string
+}
+
+type OutboundMessage = ReadyMessage | ResultMessage | ErrorMessage
+
+export type HubWsState = 'connecting' | 'connected' | 'disconnected'
+
+// --- HubWs class ---
+
+export interface HubWsHandlers {
+	onExecute: (
+		task: string,
+		config?: Record<string, unknown>
+	) => Promise<{ success: boolean; data: string }>
+	onStop: () => void
+}
+
+/**
+ * Framework-agnostic WebSocket client for Hub.
+ * Connects to an external WS server, receives tasks, dispatches to handlers,
+ * and sends results back. No React, no DOM.
+ */
+export class HubWs {
+	#ws: WebSocket | null = null
+	#state: HubWsState = 'disconnected'
+	#busy = false
+	#approved = false
+	#handlers: HubWsHandlers
+	#port: number
+	#onStateChange: (state: HubWsState) => void
+
+	constructor(port: number, handlers: HubWsHandlers, onStateChange: (state: HubWsState) => void) {
+		this.#port = port
+		this.#handlers = handlers
+		this.#onStateChange = onStateChange
+	}
+
+	get state() {
+		return this.#state
+	}
+
+	get busy() {
+		return this.#busy
+	}
+
+	connect() {
+		if (this.#ws) return
+		this.#setState('connecting')
+
+		const ws = new WebSocket(`ws://localhost:${this.#port}`)
+		this.#ws = ws
+
+		ws.addEventListener('open', () => {
+			this.#setState('connected')
+			this.#send({ type: 'ready' })
+		})
+
+		ws.addEventListener('close', () => {
+			this.#ws = null
+			this.#busy = false
+			this.#approved = false
+			this.#setState('disconnected')
+		})
+
+		ws.addEventListener('message', (event) => {
+			this.#handleMessage(event.data as string)
+		})
+	}
+
+	disconnect() {
+		this.#ws?.close()
+		this.#ws = null
+		this.#busy = false
+		this.#approved = false
+		this.#setState('disconnected')
+	}
+
+	#setState(state: HubWsState) {
+		if (this.#state === state) return
+		this.#state = state
+		this.#onStateChange(state)
+	}
+
+	#send(msg: OutboundMessage) {
+		if (this.#ws?.readyState === WebSocket.OPEN) {
+			this.#ws.send(JSON.stringify(msg))
+		}
+	}
+
+	async #handleMessage(raw: string) {
+		let msg: InboundMessage
+		try {
+			msg = JSON.parse(raw)
+		} catch {
+			return
+		}
+
+		if (!(await this.#checkApproval())) {
+			this.#send({ type: 'error', message: 'User denied the connection request.' })
+			return
+		}
+
+		switch (msg.type) {
+			case 'execute':
+				this.#handleExecute(msg)
+				break
+			case 'stop':
+				this.#handlers.onStop()
+				break
+		}
+	}
+
+	async #checkApproval(): Promise<boolean> {
+		if (this.#approved) return true
+
+		const { allowAllHubConnection } = await chrome.storage.local.get('allowAllHubConnection')
+		if (allowAllHubConnection === true) {
+			this.#approved = true
+			return true
+		}
+
+		const ok = window.confirm(
+			'An external application is requesting to control your browser via Page Agent Ext.\nAllow this session?'
+		)
+		if (ok) this.#approved = true
+		return ok
+	}
+
+	async #handleExecute(msg: ExecuteMessage) {
+		if (this.#busy) {
+			this.#send({ type: 'error', message: 'Hub is busy with another task' })
+			return
+		}
+
+		this.#busy = true
+		try {
+			const result = await this.#handlers.onExecute(msg.task, msg.config)
+			this.#send({ type: 'result', success: result.success, data: result.data })
+		} catch (err) {
+			this.#send({ type: 'error', message: err instanceof Error ? err.message : String(err) })
+		} finally {
+			this.#busy = false
+		}
+	}
+}
+
+// --- React hook ---
+
+/**
+ * React hook that bridges HubWs to the agent's execute/stop/configure.
+ * Handles the config-before-execute dance internally.
+ */
+export function useHubWs(
+	execute: (task: string) => Promise<ExecutionResult>,
+	stop: () => void,
+	configure: (config: ExtConfig) => Promise<void>,
+	config: ExtConfig | null
+): { wsState: HubWsState } {
+	const wsPort = new URLSearchParams(location.search).get('ws')
+	const [wsState, setWsState] = useState<HubWsState>(() => (wsPort ? 'connecting' : 'disconnected'))
+	const hubWsRef = useRef<HubWs | null>(null)
+
+	const latest = useRef({ execute, stop, configure, config })
+	useEffect(() => {
+		latest.current = { execute, stop, configure, config }
+	})
+
+	useEffect(() => {
+		if (!wsPort) return
+
+		const hubWs = new HubWs(
+			Number(wsPort),
+			{
+				onExecute: async (task, incomingConfig) => {
+					const { execute, configure, config } = latest.current
+					if (incomingConfig) {
+						await configure({ ...config, ...incomingConfig } as ExtConfig)
+					}
+					const result = await execute(task)
+					return { success: result.success, data: result.data }
+				},
+				onStop: () => latest.current.stop(),
+			},
+			setWsState
+		)
+
+		hubWs.connect()
+		hubWsRef.current = hubWs
+
+		return () => {
+			hubWs.disconnect()
+			hubWsRef.current = null
+		}
+	}, [wsPort])
+
+	return { wsState }
+}

packages/extension/src/entrypoints/hub/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 Hub</title>
+	</head>
+	<body>
+		<div id="root"></div>
+		<script type="module" src="./main.tsx"></script>
+	</body>
+</html>

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

@@ -0,0 +1,25 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+
+import { ErrorBoundary } from '@/components/ErrorBoundary'
+
+import App from './App'
+
+import '@/assets/index.css'
+
+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/entrypoints/main-world.ts

@@ -0,0 +1,118 @@
+import type { AgentActivity, AgentStatus, ExecutionResult, HistoricalEvent } from '@page-agent/core'
+
+export type Execute = (task: string, config: ExecuteConfig) => Promise<ExecutionResult>
+
+export interface ExecuteConfig {
+	baseURL: string
+	model: string
+	apiKey?: 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.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,
+						model: config.model,
+						apiKey: config.apiKey,
+						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 = __VERSION__
+	;(window as any).PAGE_AGENT_EXT = {
+		version: __VERSION__,
+		execute,
+		stop,
+	}
+})

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

@@ -0,0 +1,228 @@
+import { History, Send, Settings, Square } from 'lucide-react'
+import { useCallback, useEffect, useRef, useState } from 'react'
+
+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'
+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'
+
+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 runTask = useCallback(
+		(task: string) => {
+			const normalizedTask = task.trim()
+			if (!normalizedTask || status === 'running') return
+
+			setInputValue('')
+			setView({ name: 'chat' })
+
+			execute(normalizedTask).catch((error) => {
+				console.error('[SidePanel] Failed to execute task:', error)
+			})
+		},
+		[execute, status]
+	)
+
+	const handleSubmit = useCallback(
+		(e?: React.SyntheticEvent) => {
+			e?.preventDefault()
+			runTask(inputValue)
+		},
+		[inputValue, runTask]
+	)
+
+	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' })}
+				onRerun={runTask}
+			/>
+		)
+	}
+
+	if (view.name === 'history-detail') {
+		return (
+			<HistoryDetail
+				sessionId={view.sessionId}
+				onBack={() => setView({ name: 'history' })}
+				onRerun={runTask}
+			/>
+		)
+	}
+
+	// --- 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/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 +1,26 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+
+import { ErrorBoundary } from '@/components/ErrorBoundary'
+
+import App from './App'
+
+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/history-export.ts

@@ -0,0 +1,60 @@
+import type { HistoricalEvent } from '@page-agent/core'
+
+const EXPORT_FILE_PREFIX = 'page-agent-history'
+const MAX_TASK_SLUG_LENGTH = 40
+
+export function serializeHistoryExport(history: HistoricalEvent[]): string {
+	return `${JSON.stringify(history, null, 2)}\n`
+}
+
+export function buildHistoryExportFilename(task: string, createdAt: number): string {
+	const taskSlug = sanitizeTaskForFilename(task)
+	const timestamp = formatTimestampForFilename(createdAt)
+
+	return taskSlug
+		? `${EXPORT_FILE_PREFIX}-${taskSlug}-${timestamp}.json`
+		: `${EXPORT_FILE_PREFIX}-${timestamp}.json`
+}
+
+export function downloadHistoryExport(
+	task: string,
+	createdAt: number,
+	history: HistoricalEvent[]
+): void {
+	const filename = buildHistoryExportFilename(task, createdAt)
+	const content = serializeHistoryExport(history)
+	const blob = new Blob([content], { type: 'application/json;charset=utf-8' })
+	const url = URL.createObjectURL(blob)
+	const link = document.createElement('a')
+
+	link.href = url
+	link.download = filename
+	link.click()
+
+	URL.revokeObjectURL(url)
+}
+
+function sanitizeTaskForFilename(task: string): string {
+	return task
+		.trim()
+		.toLowerCase()
+		.replace(/[^a-z0-9]+/g, '-')
+		.replace(/^-+|-+$/g, '')
+		.slice(0, MAX_TASK_SLUG_LENGTH)
+}
+
+function formatTimestampForFilename(createdAt: number): string {
+	const date = new Date(createdAt)
+	const year = date.getFullYear()
+	const month = pad(date.getMonth() + 1)
+	const day = pad(date.getDate())
+	const hours = pad(date.getHours())
+	const minutes = pad(date.getMinutes())
+	const seconds = pad(date.getSeconds())
+
+	return `${year}-${month}-${day}_${hours}-${minutes}-${seconds}`
+}
+
+function pad(value: number): string {
+	return value.toString().padStart(2, '0')
+}

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 @@
+declare const __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 +1,69 @@
+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: {
+			__VERSION__: JSON.stringify(pkg.version),
+		},
+		optimizeDeps: {
+			force: true,
+		},
+		build: {
+			minify: false,
+			chunkSizeWarningLimit: 2000,
+			cssCodeSplit: true,
+			rollupOptions: {
+				onwarn: function (message, handler) {
+					if (message.code === 'EVAL') return
+					handler(message)
+				},
+			},
+		},
+	}),
+	zip: {
+		artifactTemplate: 'page-agent-ext-{{version}}-{{browser}}.zip',
+	},
+	manifest: {
+		key: 'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqbzT0iTYeYlnCvDJIGDnGU8oarJgZILDzSfLi/ufuSxXEPDKuMyD892GhvrMCZNVHS11Sh6NYUOc/PcUOhtaR2urHtcNkrpSJNV10zUamY7fxBdVEkOucfyLu8INVy+teis62MoRWYPaUPkfZUjrLGW8MsZ9aFzARfu9GGDEp2EAYsWDN6w6vyz9LJ82pm542EWnVT4MjmDPgvYFCWGBtaU/dfHD+GAX6URJFapsCvryVURKJ+76c/GO9/I3EX1IBfbY6dec78bLCMvVxiTmiv36KyGPwX1OpakW8IiCpXWdbAxjm+plbYlp5t5zTyyoE3sOSFeXsBH0Kg27o8GcvQIDAQAB',
+		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',
+		},
+		externally_connectable: {
+			matches: ['http://localhost/*'],
+		},
+	},
+})