chore(version): bump version to 1.3.0

- add `stop` method. agent can be reused after stopped
- agent can not be reused after disposed
- extension DO NOT exposes `dispose` anymore. only `stop`.
- update panel for new `stop` method
- fix MultiPageAgent dispose event
- better handling abortSignal

.gitignore

@@ -36,4 +36,11 @@ packages/page-agent/LICENSE
 
 # extension
 .output
-.wxt
+.wxt
+
+# AI
+.agent
+.claude
+.cursor
+.gemini
+CLAUDE.md

.vscode/extensions.json

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

.vscode/settings.json

@@ -1,20 +1,25 @@
 {
-    "editor.fontLigatures": true,
     "cSpell.words": [
         "deepseek",
         "historychange",
         "HITL",
         "innerhtml",
+        "languagedetector",
         "llms",
+        "magicui",
         "npmmirror",
         "onwarn",
         "opensource",
         "qwen",
         "retryable",
         "shadcn",
+        "sidepanel",
         "statuschange",
         "wouter"
     ],
+    "files.exclude": {
+        "packages/*/node_modules": true
+    },
     "markdownlint.config": {
         // "comment": "Relaxed rules",
         "default": true,
@@ -27,6 +32,7 @@
         "first-line-h1": false,
         "block-spacing": false,
         "blanks-around-lists": false,
-        "ol-prefix": false
+        "ol-prefix": false,
+        "no-duplicate-heading": false
     }
 }

AGENTS.md

@@ -5,6 +5,7 @@
 This is a **monorepo** with npm workspaces:
 
 - **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:
@@ -21,6 +22,7 @@ npm start                    # Start website dev server
 npm run build                # Build all packages
 npm run build:libs           # Build all libraries
 npm run lint                 # ESLint with TypeScript strict rules
+npm run zip -w @page-agent/ext # Zip the extension package
 ```
 
 ## Architecture
@@ -35,6 +37,7 @@ packages/
 ├── 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
 ```
@@ -127,3 +130,5 @@ const pageInfo = await this.pageController.getPageInfo()
 - ESLint relaxes some unsafe rules for rapid iteration
 - Every change you make should not only implement the desired functionality but also improve the quality of the codebase
 - All code and comments must be in English.
+- Do not try to hide errors or risks. They are valuable feedbacks for developers and users. Make them visible and actionable.
+- Traceability and predictability is more important than success rate.

CHANGELOG.md

@@ -5,6 +5,65 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.0] - 2026-02-13
+
+### Breaking Changes
+
+- **Lifecycle: `stop()` vs `dispose()`** - New `stop()` method to cancel the current task while keeping the agent reusable. `dispose()` is now terminal — a disposed agent cannot be reused. This affects both `PageAgentCore` and `PanelAgentAdapter`.
+
+### Features
+
+- **Panel action button** - The panel button now morphs between Stop (■) and Close (X) based on agent status
+- **Error history** - Errors and max-step failures are now recorded in `history` as `AgentErrorEvent`, making post-task analysis more complete
+
+### Bug Fixes
+
+- **AbortError handling** - `AbortError` is no longer retried by the LLM client, and shows a clean "Task stopped" message instead of a raw error stack
+
+---
+
+## [1.2.0] - 2026-02-11
+
+### Features
+
+- **Observe Phase** - Agent now observes the page before each action, improving decision accuracy on dynamic pages
+- **Better Abort Handling** - Improved `abortSignal` support for cleaner task cancellation
+
+### Improvements
+
+- Pruned system prompts for lower token usage and faster responses
+- Improved error handling during agent steps with better error messages
+- Zod tree-shaking for smaller bundle size
+
+### Bug Fixes
+
+- Fixed indentation lost in DOM extraction caused by `trimLines`
+- Fixed `gpt-5-mini` temperature configuration
+
+---
+
+## [1.1.0] - 2026-02-02
+
+### Features
+
+- **Custom System Prompt** - New `systemPrompt` config option to customize or extend the default system prompt
+- **Chrome Extension** - Extension with multi-tab control, main-world API with token auth, and tab lifecycle management
+
+### Improvements
+
+- Renamed `include_attributes` to `includeAttributes` in PageController config (camelCase consistency)
+- Lazy-loaded mask module for faster initialization
+- Better date formatting and error messages from LLM client
+- Added `rawRequest` to step history for easier debugging
+
+### Bug Fixes
+
+- Fixed CSP errors by using local SVGs for cursor mask instead of inline styles
+- Fixed `AbortError` being incorrectly retried and shown to users
+- Fixed mask not working correctly when starting a new task after stopping a previous one
+
+---
+
 ## [1.0.0] - 2026-01-19
 
 ### 🎉 First Stable Release

CLAUDE.md

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

CONTRIBUTING.md

@@ -20,10 +20,11 @@ Thank you for your interest in contributing to Page-Agent! We welcome contributi
 
 ### Project Structure
 
-This is a **monorepo** with npm workspaces containing **3 main packages**:
+This is a **monorepo** with npm workspaces containing **4 main packages**:
 
 - **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.
@@ -92,10 +93,28 @@ We use a simplified monorepo solution with `native npm-workspace + ts reference
 ### Vibe coding with AI
 
 - It's **recommended** to heavily rely on AI (aka "vibe coding") when maintaining **demo pages and tests**.
-- BUT **NOT the core lib!!!** Be very careful if AI ever touched the core lib!!!
+- Be very careful if AI ever touched the core lib!!!
 - Review anything AI wrote before make a commit. You are the author of anything you commit. NOT AI.
 - Update the [AI instructions](AGENTS.md) when structure changed.
 
+If your lame AI assistant does not support [AGENTS.md](https://agents.md/). Add an alias for it:
+
+- claude-code (`CLAUDE.md`)
+
+    ```markdown
+    @AGENTS.md
+    ```
+
+- antigravity (`.agent/rules/alias.md`)
+
+    ```markdown
+    ---
+    trigger: always_on
+    ---
+
+    @../../AGENTS.md
+    ```
+
 ## 🔧 Development Workflows
 
 ### Test With Your Own LLM API
@@ -108,6 +127,16 @@ We use a simplified monorepo solution with `native npm-workspace + ts reference
     LLM_BASE_URL=https://api.your-llm-provider.com/v1
     ```
 
+- **Ollama example** (tested on 0.15 + qwen3:14b, RTX3090 24GB):
+
+    ```env
+    LLM_BASE_URL="http://localhost:11434/v1"
+    LLM_API_KEY="NA"
+    LLM_MODEL_NAME="qwen3:14b"
+    ```
+
+    > ⚠️ Add `*` to `OLLAMA_ORIGINS` (403). Models < 10B unlikely strong enough. Requires tool_call support. Set context length > 15k (default 4k will NOT work): `$env:OLLAMA_CONTEXT_LENGTH=64000; ollama serve`
+
 - Restart the dev server to load new env vars
 - If not provided, the demo will the free testing proxy by default
 
@@ -117,6 +146,16 @@ We use a simplified monorepo solution with `native npm-workspace + ts reference
 npm start
 ```
 
+### Extension Development
+
+```bash
+npm run dev -w @page-agent/ext
+npm run zip -w @page-agent/ext
+```
+
+- Load extension in Chrome via `chrome://extensions` -> **Load unpacked**
+- Use `packages/extension/docs/extension_api.md` (EN) or `packages/extension/docs/extension_api_zh.md` (ZH) for API integration details
+
 ### Testing on Other Websites
 
 - Start and serve a local `iife` script
@@ -165,14 +204,6 @@ By contributing to this project, you agree that your contributions will be licen
 
 > You may need to sign a github CLA before you create a PR.
 
-### Browser-Use Attribution
-
-Parts of this project are derived from the [browser-use](https://github.com/browser-use/browser-use) project (MIT License). When contributing to DOM-related functionality:
-
-- Maintain existing attribution comments
-- Follow similar patterns for consistency
-- Credit browser-use for derived concepts
-
 ## 💬 Questions?
 
 - Open a GitHub issue for technical questions

README-zh.md

@@ -1,4 +1,4 @@
-# PageAgent 🤖🪄
+# Page Agent
 
 <picture>
   <source media="(prefers-color-scheme: dark)" srcset="https://img.alicdn.com/imgextra/i4/O1CN01qKig1P1FnhpFKNdi6_!!6000000000532-2-tps-1280-256.png">
@@ -19,35 +19,33 @@
 
 ## ✨ Features
 
-- **🎯 轻松集成**
+- **🎯 轻松集成** 
-- **🔐 端侧运行**
+  - 无需 `浏览器插件` / `Python` / `无头浏览器`。
-- **🧠 HTML 脱水**
+  - 纯页面内 JavaScript，一切都在你的网页中完成。
-- **💬 自然语言接口**
+  - The best tool for your agent to control web pages.
-- **🎨 HITL 交互界面**
+- **📖 基于文本的 DOM 操作**
-
+  - 无需截图，无需 OCR 或多模态模型。
-## 🗺️ Roadmap
+  - 无需特殊权限。
-
+- **🧠 用你自己的 LLM**
-👉 [**Roadmap**](https://github.com/alibaba/page-agent/issues/96)
+- **🎨 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。**
 
 ## 🚀 快速开始
 
-### 快速体验 (With Testing LLM)
+### 一行代码集成
 
-最快的体验方式：
+通过我们免费的 Demo LLM 快速体验 PageAgent：
 
 ```html
-<script
+<script src="{URL}" crossorigin="true"></script>
-    src="https://registry.npmmirror.com/page-agent/1.0.0-beta.3/files/dist/iife/page-agent.demo.js"
-    crossorigin="true"
-></script>
 ```
 
-> ⚠️ **仅用于技术评估。** Demo 模型有速率限制和使用限制，生产环境请使用 NPM 方式。
+| Mirrors | URL                                                                                |
+| ------- | ---------------------------------------------------------------------------------- |
+| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.3.0/dist/iife/page-agent.demo.js         |
+| China   | https://registry.npmmirror.com/page-agent/1.3.0/files/dist/iife/page-agent.demo.js |
 
-| 镜像   | URL                                                                                       |
+> **⚠️ 仅用于技术评估。** Demo LLM 有速率和使用限制，速度较慢，可能随时变更。
-| ------ | ----------------------------------------------------------------------------------------- |
-| Global | https://cdn.jsdelivr.net/npm/page-agent@1.0.0-beta.3/dist/iife/page-agent.demo.js         |
-| China  | https://registry.npmmirror.com/page-agent/1.0.0-beta.3/files/dist/iife/page-agent.demo.js |
 
 ### NPM 安装
 
@@ -68,7 +66,7 @@ const agent = new PageAgent({
 await agent.execute('点击登录按钮')
 ```
 
-适用于无法使用 NPM 的环境，我们也提供了 IIFE 构建的 CDN 方式。[@see CDN Usage](https://alibaba.github.io/page-agent/#/docs/integration/cdn-setup)
+更多编程用法，请参阅 [📖 文档](https://alibaba.github.io/page-agent/#/docs/introduction/overview)。
 
 ## 🏗️ 架构设计
 
@@ -76,25 +74,20 @@ PageAgent adopts a simplified monorepo structure:
 
 ```
 packages/
-├── core/                # ** Core agent logic without UI(npm: @page-agent/core) **
+├── core/                # ** Core agent logic (npm: @page-agent/core) **
-├── page-agent/          # Exported agent and demo(npm: page-agent)
 ├── llms/                # LLM 客户端 (npm: @page-agent/llms)
-├── page-controller/     # DOM 操作 & 蒙层 & 模拟鼠标 (npm: @page-agent/page-controller)
+├── page-controller/     # DOM 操作 (npm: @page-agent/page-controller)
-├── ui/                  # 面板 & i18n (npm: @page-agent/ui)
+├── ui/                  # 面板 UI (npm: @page-agent/ui)
-└── website/             # 文档站点
+├── page-agent/          # 入口类 & iife 包 (npm: page-agent)
+├── extension/           # Chrome 扩展，支持跨页面任务
+└── website/             # 网站 & 文档站点
 ```
 
 ## 🤝 贡献
 
-欢迎社区贡献！以下是参与方式：
+欢迎社区贡献！请参阅 [CONTRIBUTING.md](CONTRIBUTING.md) 了解环境配置和本地开发说明。
 
-1. Fork 并 clone。`git clone https://github.com/alibaba/page-agent.git && cd page-agent`
+请在贡献前阅读[行为准则](CODE_OF_CONDUCT.md)。
-2. 安装依赖: `npm install`
-3. 启动开发: `npm start`
-
-更多详情请参阅 [CONTRIBUTING.md](CONTRIBUTING.md)。
-
-请在贡献前阅读我们的[行为准则](CODE_OF_CONDUCT.md)。
 
 ## 👏 致谢
 

README.md

@@ -1,4 +1,4 @@
-# PageAgent 🤖🪄
+# Page Agent
 
 <picture>
   <source media="(prefers-color-scheme: dark)" srcset="https://img.alicdn.com/imgextra/i4/O1CN01qKig1P1FnhpFKNdi6_!!6000000000532-2-tps-1280-256.png">
@@ -19,35 +19,33 @@ The GUI Agent Living in Your Webpage. Control web interfaces with natural langua
 
 ## ✨ Features
 
-- **🎯 Easy Integration** - Transform your webpage into an agent with a single script tag.
+- **🎯 Easy integration** 
-- **🔐 Client-Side Processing**
+  - No need for `browser extension` / `python` / `headless browser`. 
-- **🧠 DOM Extraction**
+  - Just in-page javascript. Everything happens in your web page.
-- **💬 Natural Language Interface**
+  - The best tool for your agent to control web pages.
-- **🎨 UI with Human in the loop**
+- **📖 Text-based DOM manipulation**
-
+  - No screenshots. No OCR or multi-modal LLMs needed.
-## 🗺️ Roadmap
+  - No special permissions required.
-
+- **🧠 Bring your own LLMs**
-👉 [**Roadmap**](https://github.com/alibaba/page-agent/issues/96)
+- **🎨 Pretty UI with human-in-the-loop**
+- **🐙 Optional [chrome extension](https://alibaba.github.io/page-agent/#/docs/features/chrome-extension) for multi-page tasks.**
 
 ## 🚀 Quick Start
 
-### Quick Try (With Testing LLM)
+### One-line integration
 
-Fastest way to try PageAgent:
+Fastest way to try PageAgent with our free Demo LLM:
 
 ```html
-<script
+<script src="{URL}" crossorigin="true"></script>
-    src="https://cdn.jsdelivr.net/npm/page-agent@1.0.0-beta.3/dist/iife/page-agent.demo.js"
-    crossorigin="true"
-></script>
 ```
 
-> ⚠️ **For technical evaluation only.** Demo model has rate limits and usage restrictions. Use NPM for production.
+| Mirrors | URL                                                                                |
+| ------- | ---------------------------------------------------------------------------------- |
+| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.3.0/dist/iife/page-agent.demo.js         |
+| China   | https://registry.npmmirror.com/page-agent/1.3.0/files/dist/iife/page-agent.demo.js |
 
-| Mirrors | URL                                                                                       |
+> **⚠️ For technical evaluation only.** Demo LLM has rate limits and usage restrictions. Slow. May change without notice.
-| ------- | ----------------------------------------------------------------------------------------- |
-| Global  | https://cdn.jsdelivr.net/npm/page-agent@1.0.0-beta.3/dist/iife/page-agent.demo.js         |
-| China   | https://registry.npmmirror.com/page-agent/1.0.0-beta.3/files/dist/iife/page-agent.demo.js |
 
 ### NPM Installation
 
@@ -68,31 +66,28 @@ const agent = new PageAgent({
 await agent.execute('Click the login button')
 ```
 
+For more programmatic usage, see [📖 Documentations](https://alibaba.github.io/page-agent/#/docs/introduction/overview).
+
 ## 🏗️ Structure
 
 PageAgent adopts a simplified monorepo structure:
 
 ```
 packages/
-├── core/                # ** Core agent logic without UI(npm: @page-agent/core) **
+├── core/                # ** Core agent logic (npm: @page-agent/core) **
-├── page-agent/          # Exported agent and demo(npm: page-agent)
 ├── llms/                # LLM client (npm: @page-agent/llms)
-├── page-controller/     # DOM operations & Visual Mask (npm: @page-agent/page-controller)
+├── page-controller/     # DOM operations (npm: @page-agent/page-controller)
-├── ui/                  # Panel & i18n (npm: @page-agent/ui)
+├── ui/                  # Panel UI (npm: @page-agent/ui)
-└── website/             # Demo & Documentation site
+├── page-agent/          # Entry class and iife builds(npm: page-agent)
+├── extension/           # Chrome extension for multi-page tasks
+└── website/             # Website & Documentation site
 ```
 
 ## 🤝 Contributing
 
-We welcome contributions from the community! Here's how to get started:
+We welcome contributions from the community! Follow our instructions in [CONTRIBUTING.md](CONTRIBUTING.md) for environment setup and local development.
 
-1. Fork and clone. `git clone https://github.com/alibaba/page-agent.git && cd page-agent`
+Please read [Code of Conduct](CODE_OF_CONDUCT.md) before contributing.
-2. Install dependencies: `npm install`
-3. Start development: `npm start`
-
-More details in [CONTRIBUTING.md](CONTRIBUTING.md).
-
-Please read our [Code of Conduct](CODE_OF_CONDUCT.md) before contributing.
 
 ## 👏 Acknowledgments
 

eslint.config.js

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

package.json

@@ -1,7 +1,7 @@
 {
     "name": "root",
     "private": true,
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "workspaces": [
         "packages/page-controller",
@@ -9,6 +9,7 @@
         "packages/llms",
         "packages/core",
         "packages/page-agent",
+        "packages/extension",
         "packages/website"
     ],
     "description": "AI-powered UI agent for web applications",
@@ -20,8 +21,7 @@
     },
     "homepage": "https://alibaba.github.io/page-agent/",
     "engines": {
-        "node": ">=20.0.0",
+        "node": "^20.19.0 || ^22.13.0 || >=24"
-        "npm": ">=10.0.0"
     },
     "scripts": {
         "cleanup": "rm -rf packages/*/dist",
@@ -38,26 +38,30 @@
         "@commitlint/cli": "^20.3.1",
         "@commitlint/config-conventional": "^20.3.1",
         "@eslint/js": "^9.39.2",
-        "@microsoft/api-extractor": "^7.55.2",
+        "@microsoft/api-extractor": "^7.56.3",
+        "@tailwindcss/vite": "^4.1.18",
         "@trivago/prettier-plugin-sort-imports": "^6.0.2",
-        "@types/node": "^25.0.9",
+        "@types/node": "^25.2.2",
+        "@vitejs/plugin-react-swc": "^4.1.0",
+        "chalk": "^5.6.2",
         "concurrently": "^9.2.1",
-        "dotenv": "^17.2.3",
+        "dotenv": "^17.2.4",
         "eslint": "^9.39.2",
         "eslint-config-prettier": "^10.1.8",
-        "eslint-plugin-react-dom": "^2.7.2",
+        "eslint-plugin-react-dom": "^2.12.2",
         "eslint-plugin-react-hooks": "^7.0.1",
-        "eslint-plugin-react-refresh": "^0.4.26",
+        "eslint-plugin-react-refresh": "^0.5.0",
-        "eslint-plugin-react-x": "^2.7.2",
+        "eslint-plugin-react-x": "^2.12.2",
         "globals": "^17.0.0",
         "husky": "^9.1.7",
         "lint-staged": "^16.2.4",
         "prettier": "^3.8.0",
         "typescript": "^5.9.3",
-        "typescript-eslint": "^8.53.1",
+        "typescript-eslint": "^8.55.0",
         "unplugin-dts": "^1.0.0-beta.6",
         "vite": "^7.3.1",
-        "vite-plugin-css-injected-by-js": "^3.5.2"
+        "vite-plugin-css-injected-by-js": "^3.5.2",
+        "vite-bundle-analyzer": "^1.3.6"
     },
     "overrides": {
         "typescript": "^5.9.3"

packages/core/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@page-agent/core",
     "private": false,
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "main": "./dist/esm/page-agent-core.js",
     "module": "./dist/esm/page-agent-core.js",
@@ -45,7 +45,7 @@
     "dependencies": {
         "chalk": "^5.6.2",
         "zod": "^4.3.5",
-        "@page-agent/llms": "1.0.0-beta.3",
+        "@page-agent/llms": "1.3.0",
-        "@page-agent/page-controller": "1.0.0-beta.3"
+        "@page-agent/page-controller": "1.3.0"
     }
 }

packages/core/src/PageAgentCore.ts

@@ -3,34 +3,43 @@
  * All rights reserved.
  */
 import { InvokeError, LLM, type Tool } from '@page-agent/llms'
-import type { PageController } from '@page-agent/page-controller'
+import type { BrowserState, PageController } from '@page-agent/page-controller'
 import chalk from 'chalk'
-import zod from 'zod'
+import * as zod from 'zod'
 
 import { type PageAgentConfig } from './config'
 import { DEFAULT_MAX_STEPS } from './config/constants'
 import SYSTEM_PROMPT from './prompts/system_prompt.md?raw'
 import { tools } from './tools'
-import {
+import type {
 	AgentActivity,
 	AgentReflection,
 	AgentStatus,
-	AgentStep,
+	AgentStepEvent,
 	ExecutionResult,
 	HistoricalEvent,
 	MacroToolInput,
 	MacroToolResult,
 } from './types'
-import { normalizeResponse, trimLines, uid, waitFor } from './utils'
+import { assert, normalizeResponse, uid, waitFor } from './utils'
-import { assert } from './utils/assert'
 
 export { type PageAgentConfig }
 export { tool, type PageAgentTool } from './tools'
+export type * from './types'
 
 /**
- * AI agent for browser DOM automation.
+ * 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)
@@ -49,15 +58,18 @@ export { tool, type PageAgentTool } from './tools'
  *    - Types: thinking, executing, executed, retrying, error
  */
 export class PageAgentCore extends EventTarget {
-	config: PageAgentConfig & { maxSteps: number }
+	readonly id = uid()
-	id = uid()
+	readonly config: PageAgentConfig & { maxSteps: number }
-	tools: typeof tools
+	readonly tools: typeof tools
-	disposed = false
+	/** PageController for DOM operations */
+	readonly pageController: PageController
+
 	task = ''
 	taskId = ''
-
+	/** History events */
-	/** Agent execution status */
+	history: HistoricalEvent[] = []
-	#status: AgentStatus = 'idle'
+	/** Whether this agent has been disposed */
+	disposed = false
 
 	/**
 	 * Callback for when agent needs user input (ask_user tool)
@@ -66,23 +78,21 @@ export class PageAgentCore extends EventTarget {
 	 */
 	onAskUser?: (question: string) => Promise<string>
 
+	#status: AgentStatus = 'idle'
 	#llm: LLM
 	#abortController = new AbortController()
+	#observations: string[] = []
 
-	/** PageController for DOM operations */
+	/** internal states during a single task execution */
-	pageController: PageController
+	#states = {
-
+		/** Accumulated wait time in seconds */
-	/** Runtime states for tracking across steps */
-	states = {
-		/** Accumulated wait time in seconds, used by wait tool */
 		totalWaitTime: 0,
-		/** Last known URL for detecting navigation */
+		/** For detecting navigation */
 		lastURL: '',
+		/** Browser state */
+		browserState: null as BrowserState | null,
 	}
 
-	/** History events */
-	history: HistoricalEvent[] = []
-
 	constructor(config: PageAgentConfig & { pageController: PageController }) {
 		super()
 
@@ -95,11 +105,10 @@ export class PageAgentCore extends EventTarget {
 		// Listen to LLM retry events
 		this.#llm.addEventListener('retry', (e) => {
 			const { attempt, maxAttempts } = (e as CustomEvent).detail
-			this.emitActivity({ type: 'retrying', attempt, maxAttempts })
+			this.#emitActivity({ type: 'retrying', attempt, maxAttempts })
 			// Also push to history for panel rendering
 			this.history.push({
-				type: 'error',
+				type: 'retry',
-				errorType: 'retry',
 				message: `LLM retry attempt ${attempt} of ${maxAttempts}`,
 				attempt,
 				maxAttempts,
@@ -108,12 +117,12 @@ export class PageAgentCore extends EventTarget {
 		})
 		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 })
+			this.#emitActivity({ type: 'error', message })
 			// Also push to history for panel rendering
 			this.history.push({
 				type: 'error',
-				errorType: 'error',
 				message,
 				rawResponse: (error as InvokeError).rawResponse,
 			})
@@ -154,7 +163,7 @@ export class PageAgentCore extends EventTarget {
 	 * Emit activity event - for transient UI feedback
 	 * @param activity - Current agent activity
 	 */
-	emitActivity(activity: AgentActivity): void {
+	#emitActivity(activity: AgentActivity): void {
 		this.dispatchEvent(new CustomEvent('activity', { detail: activity }))
 	}
 
@@ -167,15 +176,24 @@ export class PageAgentCore extends EventTarget {
 	}
 
 	/**
-	 * Push a persistent observation to the history event stream.
+	 * Push a observation message to the history event stream.
-	 * This will be visible in <agent_history> and remain in memory across steps.
+	 * 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.history.push({ type: 'observation', content })
+		this.#observations.push(content)
-		this.#emitHistoryChange()
+	}
+
+	/** 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()
@@ -204,47 +222,44 @@ export class PageAgentCore extends EventTarget {
 		this.#setStatus('running')
 		this.#emitHistoryChange()
 
-		// Reset states
+		// Reset internal states
-		this.states = {
+		this.#states = { totalWaitTime: 0, lastURL: '', browserState: null }
-			totalWaitTime: 0,
-			lastURL: '',
-		}
 
-		try {
+		let step = 0
-			let step = 0
 
-			while (true) {
+		while (true) {
-				await this.#generateObservations(step)
+			try {
+				console.group(`step: ${step}`)
 
 				await onBeforeStep?.(this, step)
 
-				console.group(`step: ${step}`)
+				// observe
 
-				// abort
+				console.log(chalk.blue.bold('👀 Observing...'))
-				if (this.#abortController.signal.aborted) throw new Error('AbortError')
 
-				// Thinking
+				this.#states.browserState = await this.pageController.getBrowserState()
-				console.log(chalk.blue('Thinking...'))
+				await this.#handleObservations(step)
-				this.emitActivity({ type: 'thinking' })
 
-				const result = await this.#llm.invoke(
+				// assemble prompts
-					[
+
-						{
+				const messages = [
-							role: 'system',
+					{ role: 'system' as const, content: this.#getSystemPrompt() },
-							content: this.#getSystemPrompt(),
+					{ role: 'user' as const, content: await this.#assembleUserPrompt() },
-						},
+				]
-						{
+
-							role: 'user',
+				const tools = { AgentOutput: this.#packMacroTool() }
-							content: await this.#assembleUserPrompt(),
+
-						},
+				// invoke LLM
-					],
+
-					{ AgentOutput: this.#packMacroTool() },
+				console.log(chalk.blue.bold('🧠 Thinking...'))
-					this.#abortController.signal,
+				this.#emitActivity({ type: 'thinking' })
-					{
+
-						toolChoiceName: 'AgentOutput',
+				const result = await this.#llm.invoke(messages, tools, this.#abortController.signal, {
-						normalizeResponse,
+					toolChoiceName: 'AgentOutput',
-					}
+					normalizeResponse,
-				)
+				})
+
+				// assemble history
 
 				const macroResult = result.toolResult as MacroToolResult
 				const input = macroResult.input
@@ -255,7 +270,7 @@ export class PageAgentCore extends EventTarget {
 					next_goal: input.next_goal,
 				}
 				const actionName = Object.keys(input.action)[0]
-				const action: AgentStep['action'] = {
+				const action: AgentStepEvent['action'] = {
 					name: actionName,
 					input: input.action[actionName],
 					output: output,
@@ -268,30 +283,23 @@ export class PageAgentCore extends EventTarget {
 					action,
 					usage: result.usage,
 					rawResponse: result.rawResponse,
-				} as AgentStep)
+					rawRequest: result.rawRequest,
+				} as AgentStepEvent)
 				this.#emitHistoryChange()
 
-				console.log(chalk.green('Step finished:'), actionName)
+				//
-				console.groupEnd()
 
 				await onAfterStep?.(this, this.history)
 
-				step++
+				console.groupEnd()
-				if (step > this.config.maxSteps) {
+
-					this.#onDone('Step count exceeded maximum limit', false)
+				// finish task if done
-					const result: ExecutionResult = {
+
-						success: false,
-						data: 'Step count exceeded maximum limit',
-						history: this.history,
-					}
-					await onAfterTask?.(this, result)
-					return result
-				}
 				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(text, success)
+					this.#onDone(success)
 					const result: ExecutionResult = {
 						success,
 						data: text,
@@ -300,19 +308,39 @@ export class PageAgentCore extends EventTarget {
 					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
 			}
-		} catch (error: unknown) {
+
-			console.error('Task failed', error)
+			step++
-			const errorMessage = String(error)
+			if (step > this.config.maxSteps) {
-			this.emitActivity({ type: 'error', message: errorMessage })
+				const errorMessage = 'Step count exceeded maximum limit'
-			this.#onDone(errorMessage, false)
+				this.history.push({ type: 'error', message: errorMessage })
-			const result: ExecutionResult = {
+				this.#emitHistoryChange()
-				success: false,
+				this.#onDone(false)
-				data: errorMessage,
+				const result: ExecutionResult = {
-				history: this.history,
+					success: false,
+					data: errorMessage,
+					history: this.history,
+				}
+				await onAfterTask?.(this, result)
+				return result
 			}
-			await onAfterTask?.(this, result)
-			return result
 		}
 	}
 
@@ -345,13 +373,13 @@ export class PageAgentCore extends EventTarget {
 		})
 
 		return {
-			description: 'You MUST call this tool every step. Outputs your reflections and next action.',
+			description: 'You MUST call this tool every step!',
 			inputSchema: macroToolSchema as zod.ZodType<MacroToolInput>,
 			execute: async (input: MacroToolInput): Promise<MacroToolResult> => {
 				// abort
 				if (this.#abortController.signal.aborted) throw new Error('AbortError')
 
-				console.log(chalk.blue.bold('MacroTool execute'), input)
+				console.log(chalk.blue.bold('MacroTool input'), input)
 				const action = input.action
 
 				const toolName = Object.keys(action)[0]
@@ -372,12 +400,12 @@ export class PageAgentCore extends EventTarget {
 
 				// Find the corresponding tool
 				const tool = tools.get(toolName)
-				assert(tool, `Tool ${toolName} not found. (@note should have been caught before this!!!)`)
+				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 })
+				this.#emitActivity({ type: 'executing', tool: toolName, input: toolInput })
 
 				const startTime = Date.now()
 
@@ -388,7 +416,7 @@ export class PageAgentCore extends EventTarget {
 				console.log(chalk.green.bold(`Tool (${toolName}) executed for ${duration}ms`), result)
 
 				// Emit executed activity
-				this.emitActivity({
+				this.#emitActivity({
 					type: 'executed',
 					tool: toolName,
 					input: toolInput,
@@ -396,9 +424,11 @@ export class PageAgentCore extends EventTarget {
 					duration,
 				})
 
-				// Reset wait time for non-wait tools
+				// counting wait time
-				if (toolName !== 'wait') {
+				if (toolName === 'wait') {
-					this.states.totalWaitTime = 0
+					this.#states.totalWaitTime += toolInput?.seconds || 0
+				} else {
+					this.#states.totalWaitTime = 0
 				}
 
 				// Return structured result
@@ -414,10 +444,12 @@ export class PageAgentCore extends EventTarget {
 	 * Get system prompt, dynamically replace language settings based on configured language
 	 */
 	#getSystemPrompt(): string {
-		let systemPrompt = SYSTEM_PROMPT
+		if (this.config.customSystemPrompt) {
+			return this.config.customSystemPrompt
+		}
 
 		const targetLanguage = this.config.language === 'zh-CN' ? '中文' : 'English'
-		systemPrompt = systemPrompt.replace(
+		const systemPrompt = SYSTEM_PROMPT.replace(
 			/Default working language: \*\*.*?\*\*/,
 			`Default working language: **${targetLanguage}**`
 		)
@@ -426,17 +458,17 @@ export class PageAgentCore extends EventTarget {
 	}
 
 	/**
-	 * Get instructions from config and format as XML block
+	 * Get instructions from config
 	 */
 	async #getInstructions(): Promise<string> {
 		const { instructions } = this.config
 		if (!instructions) return ''
 
 		const systemInstructions = instructions.system?.trim()
-		const url = await this.pageController.getCurrentUrl()
 		let pageInstructions: string | undefined
 
-		if (instructions.getPageInstructions) {
+		const url = this.#states.browserState?.url || ''
+		if (instructions.getPageInstructions && url) {
 			try {
 				pageInstructions = instructions.getPageInstructions(url)?.trim()
 			} catch (error) {
@@ -464,23 +496,28 @@ export class PageAgentCore extends EventTarget {
 	}
 
 	/**
-	 * Generate observations before each step
+	 * Generate system observations before each step
-	 * - URL change detection
-	 * - Too many steps warning
 	 * @todo loop detection
 	 * @todo console error
 	 */
-	async #generateObservations(stepCount: number): Promise<void> {
+	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 = await this.pageController.getCurrentUrl()
+		const currentURL = this.#states.browserState?.url || ''
-		if (currentURL !== this.states.lastURL) {
+		if (currentURL !== this.#states.lastURL) {
 			this.pushObservation(`Page navigated to → ${currentURL}`)
-			this.states.lastURL = currentURL
+			this.#states.lastURL = currentURL
 			await waitFor(0.5) // wait for page to stabilize
 		}
 
-		// Warn about remaining steps
+		// Remaining steps warning
-		const remaining = this.config.maxSteps - stepCount
+		const remaining = this.config.maxSteps - step
 		if (remaining === 5) {
 			this.pushObservation(
 				`⚠️ Only ${remaining} steps remaining. Consider wrapping up or calling done with partial results.`
@@ -490,12 +527,25 @@ export class PageAgentCore extends EventTarget {
 				`⚠️ 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>
@@ -505,38 +555,36 @@ export class PageAgentCore extends EventTarget {
 
 		const stepCount = this.history.filter((e) => e.type === 'step').length
 
-		prompt += `<agent_state>
+		prompt += '<agent_state>\n'
-			<user_request>
+		prompt += '<user_request>\n'
-			${this.task}
+		prompt += `${this.task}\n`
-			</user_request>
+		prompt += '</user_request>\n'
-			<step_info>
+		prompt += '<step_info>\n'
-			Step ${stepCount + 1} of ${this.config.maxSteps} max possible steps
+		prompt += `Step ${stepCount + 1} of ${this.config.maxSteps} max possible steps\n`
-			Current date and time: ${new Date().toISOString()}
+		prompt += `Current time: ${new Date().toLocaleString()}\n`
-			</step_info>
+		prompt += '</step_info>\n'
-			</agent_state>
+		prompt += '</agent_state>\n\n'
-		`
 
 		// <agent_history>
 		//  - <step_N> for steps
 		//  - <sys> for observations and system messages
 
-		prompt += '\n<agent_history>\n'
+		prompt += '<agent_history>\n'
 
 		let stepIndex = 0
 		for (const event of this.history) {
 			if (event.type === 'step') {
 				stepIndex++
-				prompt += `<step_${stepIndex}>
+				prompt += `<step_${stepIndex}>\n`
-				Evaluation of Previous Step: ${event.reflection.evaluation_previous_goal}
+				prompt += `Evaluation of Previous Step: ${event.reflection.evaluation_previous_goal}\n`
-				Memory: ${event.reflection.memory}
+				prompt += `Memory: ${event.reflection.memory}\n`
-				Next Goal: ${event.reflection.next_goal}
+				prompt += `Next Goal: ${event.reflection.next_goal}\n`
-				Action Results: ${event.action.output}
+				prompt += `Action Results: ${event.action.output}\n`
-				</step_${stepIndex}>
+				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`
+				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
@@ -547,47 +595,37 @@ export class PageAgentCore extends EventTarget {
 
 		// <browser_state>
 
-		prompt += await this.#getBrowserState()
+		let pageContent = browserState.content
+		if (this.config.transformPageContent) {
+			pageContent = await this.config.transformPageContent(pageContent)
+		}
 
-		return trimLines(prompt)
+		prompt += '<browser_state>\n'
+		prompt += browserState.header + '\n'
+		prompt += pageContent + '\n'
+		prompt += browserState.footer + '\n\n'
+		prompt += '</browser_state>\n\n'
+
+		return prompt
 	}
 
-	#onDone(text: string, success = true) {
+	#onDone(success = true) {
 		this.pageController.cleanUpHighlights()
 		this.pageController.hideMask() // No await - fire and forget
 		this.#setStatus(success ? 'completed' : 'error')
 		this.#abortController.abort()
 	}
 
-	async #getBrowserState(): Promise<string> {
+	dispose() {
-		const state = await this.pageController.getBrowserState()
-
-		let content = state.content
-		if (this.config.transformPageContent) {
-			content = await this.config.transformPageContent(content)
-		}
-
-		return trimLines(`<browser_state>
-			Current Page: [${state.title}](${state.url})
-
-			${state.header}
-			${content}
-			${state.footer}
-
-			</browser_state>
-		`)
-	}
-
-	dispose(reason?: string) {
 		console.log('Disposing PageAgent...')
 		this.disposed = true
 		this.pageController.dispose()
-		this.history = []
+		// this.history = []
-		this.#abortController.abort(reason ?? 'PageAgent disposed')
+		this.#abortController.abort()
 
 		// Emit dispose event for UI cleanup
 		this.dispatchEvent(new Event('dispose'))
 
-		this.config.onDispose?.(this, reason)
+		this.config.onDispose?.(this)
 	}
 }

packages/core/src/config/index.ts

@@ -141,6 +141,12 @@ export interface AgentConfig {
 	 * }
 	 */
 	transformPageContent?: (content: string) => Promise<string> | string
+
+	/**
+	 * Completely override the default system prompt.
+	 * @experimental Use with caution - incorrect prompts may break agent behavior.
+	 */
+	customSystemPrompt?: string
 }
 
 export type PageAgentConfig = LLMConfig & AgentConfig & PageControllerConfig

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>
 
@@ -128,7 +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>
@@ -139,17 +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."
+  "next_goal": "State the next immediate goal and action to achieve it, in one clear sentence.",
-  "action":{"one_action_name": {// action-specific parameter}}
+  "action":{
+    "Action name": {// Action parameters}
+  }
 }
 </output>

packages/core/src/tools/index.ts

@@ -2,7 +2,7 @@
  * Internal tools for PageAgent.
  * @note Adapted from browser-use
  */
-import zod, { type z } from 'zod'
+import * as zod from 'zod'
 
 import type { PageAgentCore } from '../PageAgentCore'
 import { waitFor } from '../utils'
@@ -13,7 +13,7 @@ import { waitFor } from '../utils'
 export interface PageAgentTool<TParams = any> {
 	// name: string
 	description: string
-	inputSchema: z.ZodType<TParams>
+	inputSchema: zod.ZodType<TParams>
 	execute: (this: PageAgentCore, args: TParams) => Promise<string>
 }
 
@@ -31,14 +31,13 @@ tools.set(
 	'done',
 	tool({
 		description:
-			'Complete task - provide a summary of results for the user. Set success=True if task completed successfully, false otherwise. Text should be your response to the user summarizing results.',
+			'Complete task. Text is your final response to the user — keep it concise unless the user explicitly asks for detail.',
 		inputSchema: zod.object({
 			text: zod.string(),
 			success: zod.boolean().default(true),
 		}),
 		execute: async function (this: PageAgentCore, input) {
 			// @note main loop will handle this one
-			// this.onDone(input.text, input.success)
 			return Promise.resolve('Task completed')
 		},
 	})
@@ -47,25 +46,17 @@ tools.set(
 tools.set(
 	'wait',
 	tool({
-		description:
+		description: 'Wait for x seconds. Can be used to wait until the page or data is fully loaded.',
-			'Wait for x seconds. default 1s (max 10 seconds, min 1 second). This can be used to wait until the page or data is fully loaded.',
 		inputSchema: zod.object({
 			seconds: zod.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)
 
-			this.states.totalWaitTime += input.seconds
-
-			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.`
-				)
-			}
-
 			return `✅ Waited for ${input.seconds} seconds.`
 		},
 	})
@@ -106,7 +97,7 @@ tools.set(
 tools.set(
 	'input_text',
 	tool({
-		description: 'Click and input text into a input interactive element',
+		description: 'Click and type text into an interactive input element',
 		inputSchema: zod.object({
 			index: zod.int().min(0),
 			text: zod.string(),
@@ -140,8 +131,7 @@ tools.set(
 tools.set(
 	'scroll',
 	tool({
-		description:
+		description: 'Scroll the page vertically. Use index for scroll elements (dropdowns/custom UI).',
-			'Scroll the page by specified number of pages (set down=True to scroll down, down=False to scroll up, num_pages=number of pages to scroll like 0.5 for half page, 1.0 for one page, etc.). Optional index parameter to scroll within a specific element or its scroll container (works well for dropdowns and custom UI components). Optional pixels parameter to scroll by a specific number of pixels instead of pages.',
 		inputSchema: zod.object({
 			down: zod.boolean().default(true),
 			num_pages: zod.number().min(0).max(10).optional().default(0.1),
@@ -158,11 +148,14 @@ tools.set(
 	})
 )
 
+/**
+ * @todo Tables need a dedicated parser to extract structured data. This tool is useless.
+ */
 tools.set(
 	'scroll_horizontally',
 	tool({
 		description:
-			'Scroll the page or element horizontally (set right=True to scroll right, right=False to scroll left, pixels=number of pixels to scroll). Optional index parameter to scroll within a specific element or its scroll container (works well for wide tables).',
+			'Scroll the page horizontally, or within a specific element by index. Useful for wide tables.',
 		inputSchema: zod.object({
 			right: zod.boolean().default(true),
 			pixels: zod.number().int().min(0),
@@ -190,8 +183,6 @@ tools.set(
 	})
 )
 
-// @todo get_dropdown_options
-// @todo select_dropdown_option
 // @todo send_keys
 // @todo upload_file
 // @todo go_back

packages/core/src/types.ts

@@ -33,7 +33,7 @@ export interface MacroToolResult {
 /**
  * A single agent step with reflection and action
  */
-export interface AgentStep {
+export interface AgentStepEvent {
 	type: 'step'
 	stepIndex: number
 	reflection: Partial<AgentReflection>
@@ -51,6 +51,8 @@ export interface AgentStep {
 	}
 	/** Raw LLM response for debugging */
 	rawResponse?: unknown
+	/** Raw LLM request for debugging */
+	rawRequest?: unknown
 }
 
 /**
@@ -69,21 +71,33 @@ export interface UserTakeoverEvent {
 }
 
 /**
- * Error event (retry or error from LLM)
+ * Retry event - LLM call is being retried
  */
-export interface ErrorEvent {
+export interface RetryEvent {
-	type: 'error'
+	type: 'retry'
-	errorType: 'retry' | 'error'
+	message: string
+	attempt: number
+	maxAttempts: number
+}
+
+/**
+ * Error event - fatal error from LLM or execution
+ */
+export interface AgentErrorEvent {
+	type: 'error'
 	message: string
-	attempt?: number
-	maxAttempts?: number
 	rawResponse?: unknown
 }
 
 /**
  * Union type for all history events
  */
-export type HistoricalEvent = AgentStep | ObservationEvent | UserTakeoverEvent | ErrorEvent
+export type HistoricalEvent =
+	| AgentStepEvent
+	| ObservationEvent
+	| UserTakeoverEvent
+	| RetryEvent
+	| AgentErrorEvent
 
 /**
  * Agent execution status

packages/core/src/utils/assert.ts

@@ -1,17 +0,0 @@
-import chalk from 'chalk'
-
-/**
- * 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/src/utils/index.ts

@@ -1,27 +1,7 @@
+import chalk from 'chalk'
+
 export { normalizeResponse } from './autoFixer'
 
-/**
- * Wait until condition becomes true
- * @returns Returns when condition becomes true, throws otherwise
- * @param timeout Timeout in milliseconds, default 0 means no timeout, throws error on timeout
- */
-export async function waitUntil(check: () => boolean, timeout = 60 * 60_1000): Promise<boolean> {
-	if (check()) return true
-
-	return new Promise((resolve, reject) => {
-		const start = Date.now()
-		const interval = setInterval(() => {
-			if (check()) {
-				clearInterval(interval)
-				resolve(true)
-			} else if (Date.now() - start > timeout) {
-				clearInterval(interval)
-				reject(new Error('Timeout waiting for condition to become true'))
-			}
-		}, 100)
-	})
-}
-
 export async function waitFor(seconds: number): Promise<void> {
 	await new Promise((resolve) => setTimeout(resolve, seconds * 1000))
 }
@@ -37,15 +17,6 @@ export function truncate(text: string, maxLength: number): string {
 
 //
 
-export function trimLines(text: string): string {
-	return text
-		.split('\n')
-		.map((line) => line.trim())
-		.join('\n')
-}
-
-//
-
 export function randomID(existingIDs?: string[]): string {
 	let id = Math.random().toString(36).substring(2, 11)
 
@@ -85,3 +56,19 @@ export function uid() {
 	ids.push(id)
 	return id
 }
+
+/**
+ * Simple assertion function that throws an error if the condition is falsy
+ * @param condition - The condition to assert
+ * @param message - Optional error message
+ * @throws Error if condition is falsy
+ */
+export function assert(condition: unknown, message?: string, silent?: boolean): asserts condition {
+	if (!condition) {
+		const errorMessage = message ?? 'Assertion failed'
+
+		if (!silent) console.error(chalk.red(`❌ assert: ${errorMessage}`))
+
+		throw new Error(errorMessage)
+	}
+}

packages/extension/.prettierignore

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

packages/extension/PRIVACY.md

@@ -0,0 +1,57 @@
+# Privacy Policy for Page Agent Extension
+
+**Last updated:** January 2026
+
+## Overview
+
+Page Agent Extension is a browser automation tool that uses AI to help you interact with web pages. This policy explains what data is processed and under what circumstances.
+
+## Data Processing
+
+### Local 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 itself.
+
+### Data Transmission
+
+Data is transmitted to external servers **only when you initiate an automation task**. When this occurs:
+
+- Your task instructions (natural language commands)
+- Sanitized page structure (simplified DOM, excluding sensitive form values)
+
+are sent to the LLM API endpoint configured in **your settings**.
+
+**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 our testing endpoint**, your requests are proxied to [DeepSeek](https://deepseek.com) for AI processing. Regarding this test endpoint:
+
+- This endpoint is provided for evaluation purposes only and is not recommended for production or daily use
+- We do **not** store your task content, page content, or visited URLs
+- Minimal logging (timestamps, request metadata, IP addresses) may occur for abuse prevention and service stability
+- DeepSeek's [Privacy Policy](https://cdn.deepseek.com/policies/en-US/deepseek-privacy-policy.html) applies to their processing of your requests
+
+## Data Storage
+
+- **Local storage only**: Your configuration (API endpoint, API key, model selection) is stored in your browser via `chrome.storage.local`
+- **No cloud sync**: Configuration is not synced to any external server
+- **No analytics**: The extension does not include any analytics or tracking code
+
+## Your Control
+
+- The extension is open source and can be audited by anyone
+- You choose which LLM provider to use
+- You may configure your own API endpoint at any time
+- You can clear all stored data by removing the extension
+
+## Changes to This Policy
+
+We may update this policy as the extension evolves. Significant changes will be noted in the extension's release notes.
+
+## Contact
+
+For questions about this privacy policy:
+https://github.com/alibaba/page-agent/issues
+
+---
+
+Source code: https://github.com/alibaba/page-agent

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/index.css",
+        "baseColor": "neutral",
+        "cssVariables": true,
+        "prefix": ""
+    },
+    "iconLibrary": "lucide",
+    "aliases": {
+        "components": "@/components",
+        "utils": "@/lib/utils",
+        "ui": "@/components/ui",
+        "lib": "@/lib",
+        "hooks": "@/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
+  apiKey: string
+  model: string
+
+  // Include the initial tab where page JS starts. Default: true.
+  includeInitialTab?: boolean
+
+  onStatusChange?: (status: AgentStatus) => void
+  onActivity?: (activity: AgentActivity) => void
+  onHistoryUpdate?: (history: HistoricalEvent[]) => void
+}
+
+export type Execute = (task: string, config: ExecuteConfig) => Promise<ExecutionResult>
+```
+
+`AgentStatus`
+
+```typescript
+type AgentStatus = 'idle' | 'running' | 'completed' | 'error'
+```
+
+`AgentActivity`
+
+```typescript
+type AgentActivity =
+  | { type: 'thinking' }
+  | { type: 'executing'; tool: string; input: unknown }
+  | { type: 'executed'; tool: string; input: unknown; output: string; duration: number }
+  | { type: 'retrying'; attempt: number; maxAttempts: number }
+  | { type: 'error'; message: string }
+```
+
+`HistoricalEvent`
+
+```typescript
+type HistoricalEvent =
+  | { type: 'step'; stepIndex: number; reflection: AgentReflection; action: Action }
+  | { type: 'observation'; content: string }
+  | { type: 'user_takeover' }
+  | { type: 'retry'; message: string; attempt: number; maxAttempts: number }
+  | { type: 'error'; message: string; rawResponse?: unknown }
+```
+
+`ExecutionResult`
+
+```typescript
+interface ExecutionResult {
+  success: boolean
+  data: string
+  history: HistoricalEvent[]
+}
+```
+
+## Usage Examples
+
+### Basic Execution
+
+```typescript
+const result = await window.PAGE_AGENT_EXT!.execute(
+  'Fill in the email field with test@example.com and click Submit',
+  {
+    baseURL: 'https://api.openai.com/v1',
+    apiKey: process.env.OPENAI_API_KEY!,
+    model: 'gpt-5.2',
+    includeInitialTab: false, // Optional: exclude current tab
+    onStatusChange: (status) => console.log(status),
+    onActivity: (activity) => console.log(activity),
+  }
+)
+```
+
+### Stop the Current Task
+
+```typescript
+window.PAGE_AGENT_EXT!.stop()
+```
+
+## Window Type Declaration
+
+If you are not importing `@page-agent/core`, add:
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+interface ExecuteConfig {
+  baseURL: string
+  apiKey: string
+  model: string
+  includeInitialTab?: boolean
+  onStatusChange?: (status: AgentStatus) => void
+  onActivity?: (activity: AgentActivity) => void
+  onHistoryUpdate?: (history: HistoricalEvent[]) => void
+}
+
+declare global {
+  interface Window {
+    PAGE_AGENT_EXT_VERSION?: string
+    PAGE_AGENT_EXT?: {
+      version: string
+      execute: Execute
+      stop: () => void
+    }
+  }
+}
+```

packages/extension/docs/extension_api_zh.md

@@ -0,0 +1,226 @@
+# Page Agent 浏览器插件 API
+
+在你的网页应用中接入 Page Agent 插件，并通过页面 JavaScript 发起多页面浏览器任务。
+
+## 安装
+
+### 1. 安装浏览器插件
+
+首选渠道：
+
+- Chrome 应用商店：https://chromewebstore.google.com/detail/page-agent-ext/akldabonmimlicnjlflnapfeklbfemhj
+
+通常更快提供最新构建的渠道：
+
+- GitHub Releases：https://github.com/alibaba/page-agent/releases
+
+### 2. 安装类型定义（推荐）
+
+```bash
+npm install @page-agent/core --save-dev
+```
+
+### 3. 授权（Token）
+
+token 用于让页面 JS 调用扩展 API（`window.PAGE_AGENT_EXT`）并执行多页面任务。
+
+为什么必须使用 token：
+
+- 插件具备较广的浏览器权限（页面访问、导航、多标签控制）。
+- 若被滥用，可能危害用户隐私与安全。
+- 用户必须主动将 token 提供给其信任的应用。
+
+配置步骤：
+
+1. 在扩展侧边栏中复制 auth token。
+2. 在页面中设置 token：
+
+```typescript
+localStorage.setItem('PageAgentExtUserAuthToken', 'your-token')
+```
+
+## 快速开始
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+// 等待插件注入（最多 1 秒）
+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
+}
+
+// 使用
+if (await waitForExtension()) {
+  const result = await window.PAGE_AGENT_EXT!.execute('点击登录按钮', {
+    baseURL: 'https://api.openai.com/v1',
+    apiKey: 'your-api-key',
+    model: 'gpt-5.2',
+    onStatusChange: (status) => console.log('状态:', status),
+    onActivity: (activity) => console.log('活动:', activity),
+  })
+  console.log('结果:', result)
+}
+```
+
+## 全局 API
+
+token 匹配后，插件会在 `window` 上注入 API。
+
+### `window.PAGE_AGENT_EXT_VERSION`
+
+插件版本号字符串，可用于在访问主 API 前做能力检查。
+
+### `window.PAGE_AGENT_EXT`
+
+主命名空间对象。
+
+#### `PAGE_AGENT_EXT.execute(task, config)`
+
+执行 Agent 任务。
+
+参数：
+
+| 名称 | 类型 | 必填 | 说明 |
+| ---- | ---- | ---- | ---- |
+| `task` | `string` | 是 | 任务描述 |
+| `config` | `ExecuteConfig` | 是 | LLM 设置、执行选项和回调 |
+
+返回：`Promise<ExecutionResult>`
+
+#### `PAGE_AGENT_EXT.stop()`
+
+停止当前任务。
+
+## 类型定义
+
+安装 `@page-agent/core` 获取完整类型：
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+export interface ExecuteConfig {
+  baseURL: string
+  apiKey: string
+  model: string
+
+  // 是否包含启动脚本所在标签页。默认 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[]
+}
+```
+
+## 使用示例
+
+### 基础执行
+
+```typescript
+const result = await window.PAGE_AGENT_EXT!.execute(
+  '在邮箱输入框填入 test@example.com 然后点击提交',
+  {
+    baseURL: 'https://api.openai.com/v1',
+    apiKey: process.env.OPENAI_API_KEY!,
+    model: 'gpt-5.2',
+    includeInitialTab: false, // 可选：排除当前标签页
+    onStatusChange: (status) => console.log(status),
+    onActivity: (activity) => console.log(activity),
+  }
+)
+```
+
+### 停止当前任务
+
+```typescript
+window.PAGE_AGENT_EXT!.stop()
+```
+
+## Window 类型声明
+
+如果你不直接引入 `@page-agent/core`，可添加以下声明：
+
+```typescript
+import type {
+  AgentActivity,
+  AgentStatus,
+  ExecutionResult,
+  HistoricalEvent,
+} from '@page-agent/core'
+
+interface ExecuteConfig {
+  baseURL: string
+  apiKey: string
+  model: string
+  includeInitialTab?: boolean
+  onStatusChange?: (status: AgentStatus) => void
+  onActivity?: (activity: AgentActivity) => void
+  onHistoryUpdate?: (history: HistoricalEvent[]) => void
+}
+
+declare global {
+  interface Window {
+    PAGE_AGENT_EXT_VERSION?: string
+    PAGE_AGENT_EXT?: {
+      version: string
+      execute: Execute
+      stop: () => void
+    }
+  }
+}
+```

packages/extension/package.json

@@ -0,0 +1,48 @@
+{
+    "name": "@page-agent/ext",
+    "private": true,
+    "version": "0.1.5",
+    "type": "module",
+    "scripts": {
+        "dev": "wxt",
+        "build:ext": "wxt build",
+        "zip": "wxt zip",
+        "postinstall": "wxt prepare"
+    },
+    "devDependencies": {
+        "@radix-ui/react-hover-card": "^1.1.15",
+        "@radix-ui/react-icons": "^1.3.2",
+        "@radix-ui/react-label": "^2.1.8",
+        "@radix-ui/react-separator": "^1.1.8",
+        "@radix-ui/react-slot": "^1.2.4",
+        "@radix-ui/react-switch": "^1.2.6",
+        "@radix-ui/react-tooltip": "^1.2.8",
+        "@types/chrome": "^0.1.34",
+        "@types/react": "^19.2.13",
+        "@types/react-dom": "^19.2.1",
+        "@wxt-dev/module-react": "^1.1.5",
+        "class-variance-authority": "^0.7.1",
+        "clsx": "^2.1.1",
+        "idb": "^8.0.3",
+        "lucide-react": "^0.563.0",
+        "motion": "^12.34.0",
+        "next-themes": "^0.4.6",
+        "react": "^19.2.4",
+        "react-dom": "^19.2.4",
+        "rough-notation": "^0.5.1",
+        "simple-icons": "^16.8.0",
+        "sonner": "^2.0.7",
+        "tailwind-merge": "^3.4.0",
+        "tailwindcss": "^4.1.14",
+        "tw-animate-css": "^1.4.0",
+        "wxt": "^0.20.14"
+    },
+    "dependencies": {
+        "@page-agent/core": "1.3.0",
+        "@page-agent/llms": "1.3.0",
+        "@page-agent/page-controller": "1.3.0",
+        "@page-agent/ui": "1.3.0",
+        "chalk": "^5.6.2",
+        "zod": "^4.3.5"
+    }
+}

packages/extension/src/agent/.prettierignore

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

packages/extension/src/agent/MultiPageAgent.ts

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

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

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

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

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

packages/extension/src/agent/RemotePageController.ts

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

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

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

packages/extension/src/agent/TabsController.ts

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

packages/extension/src/agent/constants.ts

@@ -0,0 +1,13 @@
+import type { LLMConfig } from '@page-agent/llms'
+
+// Demo LLM for testing
+export const DEMO_MODEL = 'PAGE-AGENT-FREE-TESTING-RANDOM'
+export const DEMO_BASE_URL =
+	'https://hwcxiuzfylggtcktqgij.supabase.co/functions/v1/llm-testing-proxy'
+export const DEMO_API_KEY = 'PAGE-AGENT-FREE-TESTING-RANDOM'
+
+export const DEMO_CONFIG: LLMConfig = {
+	apiKey: DEMO_API_KEY,
+	baseURL: DEMO_BASE_URL,
+	model: DEMO_MODEL,
+}

packages/extension/src/agent/system_prompt.md

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

packages/extension/src/agent/tabTools.ts

@@ -0,0 +1,74 @@
+/**
+ * Tab control tools for browser extension
+ *
+ * These tools allow the agent to manage multiple browser tabs:
+ * - open_new_tab: Open a new tab and set it as current
+ * - switch_to_tab: Switch to an existing tab
+ * - close_tab: Close a tab (optionally switch to another)
+ */
+import * as zod from 'zod'
+
+import type { TabsController } from './TabsController'
+
+/** Tool definition compatible with PageAgentCore customTools */
+interface TabTool {
+	description: string
+	inputSchema: zod.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: zod.object({
+				url: zod.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: zod.object({
+				tab_id: zod.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: zod.object({
+				tab_id: zod.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 +1,105 @@
+/**
+ * React hook for using AgentController
+ */
+import type { AgentActivity, AgentStatus, HistoricalEvent } 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 } from './constants'
+
+export interface UseAgentResult {
+	status: AgentStatus
+	history: HistoricalEvent[]
+	activity: AgentActivity | null
+	currentTask: string
+	config: LLMConfig | null
+	execute: (task: string) => Promise<void>
+	stop: () => void
+	configure: (config: LLMConfig) => 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<LLMConfig | null>(null)
+
+	useEffect(() => {
+		chrome.storage.local.get('llmConfig').then((result) => {
+			if (result.llmConfig) {
+				setConfig(result.llmConfig as LLMConfig)
+			} else {
+				chrome.storage.local.set({ llmConfig: DEMO_CONFIG })
+				setConfig(DEMO_CONFIG)
+			}
+		})
+	}, [])
+
+	useEffect(() => {
+		if (!config) return
+
+		const agent = new MultiPageAgent(config)
+		agentRef.current = agent
+
+		const handleStatusChange = (e: Event) => {
+			const newStatus = agent.status as AgentStatus
+			setStatus(newStatus)
+			if (newStatus === 'idle' || newStatus === 'completed' || newStatus === 'error') {
+				setActivity(null)
+			}
+		}
+
+		const handleHistoryChange = (e: Event) => {
+			setHistory([...agent.history])
+		}
+
+		const handleActivity = (e: Event) => {
+			const newActivity = (e as CustomEvent).detail as AgentActivity
+			setActivity(newActivity)
+		}
+
+		agent.addEventListener('statuschange', handleStatusChange)
+		agent.addEventListener('historychange', handleHistoryChange)
+		agent.addEventListener('activity', handleActivity)
+
+		return () => {
+			agent.removeEventListener('statuschange', handleStatusChange)
+			agent.removeEventListener('historychange', handleHistoryChange)
+			agent.removeEventListener('activity', handleActivity)
+			agent.dispose()
+		}
+	}, [config])
+
+	const execute = useCallback(async (task: string) => {
+		const agent = agentRef.current
+		console.log('🚀 [useAgent] start executing task:', task)
+		if (!agent) throw new Error('Agent not initialized')
+
+		setCurrentTask(task)
+		setHistory([])
+		await agent.execute(task)
+	}, [])
+
+	const stop = useCallback(() => {
+		agentRef.current?.stop()
+	}, [])
+
+	const configure = useCallback(async (newConfig: LLMConfig) => {
+		await chrome.storage.local.set({ llmConfig: newConfig })
+		setConfig(newConfig)
+	}, [])
+
+	return {
+		status,
+		history,
+		activity,
+		currentTask,
+		config,
+		execute,
+		stop,
+		configure,
+	}
+}

packages/extension/src/assets/index.css

@@ -0,0 +1,123 @@
+@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);
+}
+
+@layer base {
+	* {
+		@apply border-border outline-ring/50;
+	}
+	body {
+		@apply bg-background text-foreground;
+	}
+}

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

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+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 +1,156 @@
+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.
+				'has-[[data-slot=input-group-control]:focus-visible]:border-ring has-[[data-slot=input-group-control]:focus-visible]:ring-ring/50 has-[[data-slot=input-group-control]:focus-visible]:ring-[3px]',
+
+				// Error state.
+				'has-[[data-slot][aria-invalid=true]]:ring-destructive/20 has-[[data-slot][aria-invalid=true]]:border-destructive dark:has-[[data-slot][aria-invalid=true]]:ring-destructive/40',
+
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+const inputGroupAddonVariants = cva(
+	"text-muted-foreground flex h-auto cursor-text items-center justify-center gap-2 py-1.5 text-sm font-medium select-none [&>svg:not([class*='size-'])]:size-4 [&>kbd]:rounded-[calc(var(--radius)-5px)] group-data-[disabled=true]/input-group:opacity-50",
+	{
+		variants: {
+			align: {
+				'inline-start': 'order-first pl-3 has-[>button]:ml-[-0.45rem] has-[>kbd]:ml-[-0.35rem]',
+				'inline-end': 'order-last pr-3 has-[>button]:mr-[-0.45rem] has-[>kbd]:mr-[-0.35rem]',
+				'block-start':
+					'order-first w-full justify-start px-3 pt-3 [.border-b]:pb-3 group-has-[>input]/input-group:pt-2.5',
+				'block-end':
+					'order-last w-full justify-start px-3 pb-3 [.border-t]:pt-3 group-has-[>input]/input-group:pb-2.5',
+			},
+		},
+		defaultVariants: {
+			align: 'inline-start',
+		},
+	}
+)
+
+function InputGroupAddon({
+	className,
+	align = 'inline-start',
+	...props
+}: React.ComponentProps<'div'> & VariantProps<typeof inputGroupAddonVariants>) {
+	return (
+		<div
+			role="group"
+			data-slot="input-group-addon"
+			data-align={align}
+			className={cn(inputGroupAddonVariants({ align }), className)}
+			onClick={(e) => {
+				if ((e.target as HTMLElement).closest('button')) {
+					return
+				}
+				e.currentTarget.parentElement?.querySelector('input')?.focus()
+			}}
+			{...props}
+		/>
+	)
+}
+
+const inputGroupButtonVariants = cva('text-sm shadow-none flex gap-2 items-center', {
+	variants: {
+		size: {
+			xs: "h-6 gap-1 px-2 rounded-[calc(var(--radius)-5px)] [&>svg:not([class*='size-'])]:size-3.5 has-[>svg]:px-2",
+			sm: 'h-8 px-2.5 gap-1.5 rounded-md has-[>svg]:px-2.5',
+			'icon-xs': 'size-6 rounded-[calc(var(--radius)-5px)] p-0 has-[>svg]:p-0',
+			'icon-sm': 'size-8 p-0 has-[>svg]:p-0',
+		},
+	},
+	defaultVariants: {
+		size: 'xs',
+	},
+})
+
+function InputGroupButton({
+	className,
+	type = 'button',
+	variant = 'ghost',
+	size = 'xs',
+	...props
+}: Omit<React.ComponentProps<typeof Button>, 'size'> &
+	VariantProps<typeof inputGroupButtonVariants>) {
+	return (
+		<Button
+			type={type}
+			data-size={size}
+			variant={variant}
+			className={cn(inputGroupButtonVariants({ size }), className)}
+			{...props}
+		/>
+	)
+}
+
+function InputGroupText({ className, ...props }: React.ComponentProps<'span'>) {
+	return (
+		<span
+			className={cn(
+				"text-muted-foreground flex items-center gap-2 text-sm [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4",
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function InputGroupInput({ className, ...props }: React.ComponentProps<'input'>) {
+	return (
+		<Input
+			data-slot="input-group-control"
+			className={cn(
+				'flex-1 rounded-none border-0 bg-transparent shadow-none focus-visible:ring-0 dark:bg-transparent',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+function InputGroupTextarea({ className, ...props }: React.ComponentProps<'textarea'>) {
+	return (
+		<Textarea
+			data-slot="input-group-control"
+			className={cn(
+				'flex-1 resize-none rounded-none border-0 bg-transparent py-3 shadow-none focus-visible:ring-0 dark:bg-transparent',
+				className
+			)}
+			{...props}
+		/>
+	)
+}
+
+export {
+	InputGroup,
+	InputGroupAddon,
+	InputGroupButton,
+	InputGroupText,
+	InputGroupInput,
+	InputGroupTextarea,
+}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

packages/extension/src/entrypoints/background.ts

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

packages/extension/src/entrypoints/content.ts

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

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

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

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

@@ -0,0 +1,212 @@
+import { History, Send, Settings, Square } from 'lucide-react'
+import { useCallback, useEffect, useRef, useState } from 'react'
+
+import { Button } from '@/components/ui/button'
+import {
+	InputGroup,
+	InputGroupAddon,
+	InputGroupButton,
+	InputGroupTextarea,
+} from '@/components/ui/input-group'
+import { saveSession } from '@/lib/db'
+
+import { useAgent } from '../../agent/useAgent'
+import { ConfigPanel } from './components/ConfigPanel'
+import { HistoryDetail } from './components/HistoryDetail'
+import { HistoryList } from './components/HistoryList'
+import { ActivityCard, EventCard } from './components/cards'
+import { EmptyState, Logo, StatusDot } from './components/misc'
+
+type View =
+	| { name: 'chat' }
+	| { name: 'config' }
+	| { name: 'history' }
+	| { name: 'history-detail'; sessionId: string }
+
+export default function App() {
+	const [view, setView] = useState<View>({ name: 'chat' })
+	const [inputValue, setInputValue] = useState('')
+	const historyRef = useRef<HTMLDivElement>(null)
+	const textareaRef = useRef<HTMLTextAreaElement>(null)
+
+	const { status, history, activity, currentTask, config, execute, stop, configure } = useAgent()
+
+	// Persist session when task finishes
+	const prevStatusRef = useRef(status)
+	useEffect(() => {
+		const prev = prevStatusRef.current
+		prevStatusRef.current = status
+
+		if (
+			prev === 'running' &&
+			(status === 'completed' || status === 'error') &&
+			history.length > 0 &&
+			currentTask
+		) {
+			saveSession({ task: currentTask, history, status }).catch((err) =>
+				console.error('[SidePanel] Failed to save session:', err)
+			)
+		}
+	}, [status, history, currentTask])
+
+	// Auto-scroll to bottom on new events
+	useEffect(() => {
+		if (historyRef.current) {
+			historyRef.current.scrollTop = historyRef.current.scrollHeight
+		}
+	}, [history, activity])
+
+	const handleSubmit = useCallback(
+		(e?: React.SyntheticEvent) => {
+			e?.preventDefault()
+			if (!inputValue.trim() || status === 'running') return
+
+			const taskToExecute = inputValue.trim()
+			setInputValue('')
+
+			execute(taskToExecute).catch((error) => {
+				console.error('[SidePanel] Failed to execute task:', error)
+			})
+		},
+		[inputValue, status, execute]
+	)
+
+	const handleStop = useCallback(() => {
+		console.log('[SidePanel] Stopping task...')
+		stop()
+	}, [stop])
+
+	const handleKeyDown = (e: React.KeyboardEvent) => {
+		if (e.key === 'Enter' && !e.shiftKey && !e.nativeEvent.isComposing) {
+			e.preventDefault()
+			handleSubmit()
+		}
+	}
+
+	// --- View routing ---
+
+	if (view.name === 'config') {
+		return (
+			<ConfigPanel
+				config={config}
+				onSave={async (newConfig) => {
+					await configure(newConfig)
+					setView({ name: 'chat' })
+				}}
+				onClose={() => setView({ name: 'chat' })}
+			/>
+		)
+	}
+
+	if (view.name === 'history') {
+		return (
+			<HistoryList
+				onSelect={(id) => setView({ name: 'history-detail', sessionId: id })}
+				onBack={() => setView({ name: 'chat' })}
+			/>
+		)
+	}
+
+	if (view.name === 'history-detail') {
+		return <HistoryDetail sessionId={view.sessionId} onBack={() => setView({ name: 'history' })} />
+	}
+
+	// --- Chat view ---
+
+	const isRunning = status === 'running'
+	const showEmptyState = !currentTask && history.length === 0 && !isRunning
+
+	return (
+		<div className="flex flex-col h-screen bg-background">
+			{/* 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-3">
+					<StatusDot status={status} />
+					<Button
+						variant="ghost"
+						size="icon-sm"
+						onClick={() => setView({ name: 'history' })}
+						className="cursor-pointer"
+					>
+						<History className="size-3.5" />
+					</Button>
+					<Button
+						variant="ghost"
+						size="icon-sm"
+						onClick={() => setView({ name: 'config' })}
+						className="cursor-pointer"
+					>
+						<Settings className="size-3.5" />
+					</Button>
+				</div>
+			</header>
+
+			{/* Content */}
+			<main className="flex-1 overflow-hidden flex flex-col">
+				{/* Current task */}
+				{currentTask && (
+					<div className="border-b px-3 py-2 bg-muted/30">
+						<div className="text-[10px] text-muted-foreground uppercase tracking-wide">Task</div>
+						<div className="text-xs font-medium truncate" title={currentTask}>
+							{currentTask}
+						</div>
+					</div>
+				)}
+
+				{/* History */}
+				<div ref={historyRef} className="flex-1 overflow-y-auto p-3 space-y-2">
+					{showEmptyState && <EmptyState />}
+
+					{history.map((event, index) => (
+						// eslint-disable-next-line react-x/no-array-index-key
+						<EventCard key={index} event={event} />
+					))}
+
+					{/* Activity indicator at bottom */}
+					{activity && <ActivityCard activity={activity} />}
+				</div>
+			</main>
+
+			{/* Input */}
+			<footer className="border-t p-3">
+				<InputGroup className="relative rounded-lg">
+					<InputGroupTextarea
+						ref={textareaRef}
+						placeholder="Describe your task... (Enter to send)"
+						value={inputValue}
+						onChange={(e) => setInputValue(e.target.value)}
+						onKeyDown={handleKeyDown}
+						disabled={isRunning}
+						className="text-xs pr-12 min-h-10"
+					/>
+					<InputGroupAddon align="inline-end" className="absolute bottom-0 right-0">
+						{isRunning ? (
+							<InputGroupButton
+								size="icon-sm"
+								variant="destructive"
+								onClick={handleStop}
+								className="size-7"
+							>
+								<Square className="size-3" />
+							</InputGroupButton>
+						) : (
+							<InputGroupButton
+								size="icon-sm"
+								variant="default"
+								onClick={() => handleSubmit()}
+								disabled={!inputValue.trim()}
+								className="size-7 cursor-pointer"
+							>
+								<Send className="size-3" />
+							</InputGroupButton>
+						)}
+					</InputGroupAddon>
+				</InputGroup>
+			</footer>
+		</div>
+	)
+}

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

@@ -0,0 +1,243 @@
+import type { LLMConfig } from '@page-agent/llms'
+import { Copy, CornerUpLeft, Eye, EyeOff, HatGlasses, Home, Loader2, Scale } from 'lucide-react'
+import { useEffect, useState } from 'react'
+import { siGithub } from 'simple-icons'
+
+import { DEMO_API_KEY, DEMO_BASE_URL, DEMO_MODEL } from '@/agent/constants'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+
+interface ConfigPanelProps {
+	config: LLMConfig | null
+	onSave: (config: LLMConfig) => Promise<void>
+	onClose: () => void
+}
+
+export function ConfigPanel({ config, onSave, onClose }: ConfigPanelProps) {
+	const [apiKey, setApiKey] = useState(config?.apiKey || DEMO_API_KEY)
+	const [baseURL, setBaseURL] = useState(config?.baseURL || DEMO_BASE_URL)
+	const [model, setModel] = useState(config?.model || DEMO_MODEL)
+	const [saving, setSaving] = useState(false)
+	const [userAuthToken, setUserAuthToken] = useState<string>('')
+	const [copied, setCopied] = useState(false)
+	const [showToken, setShowToken] = useState(false)
+	const [showApiKey, setShowApiKey] = useState(false)
+
+	// Update local state when config prop changes
+	useEffect(() => {
+		setApiKey(config?.apiKey || DEMO_API_KEY)
+		setBaseURL(config?.baseURL || DEMO_BASE_URL)
+		setModel(config?.model || DEMO_MODEL)
+	}, [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 })
+		} 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">
+					Add this token to a website's localStorage to give it authorization to call this extension
+				</p>
+				<div className="flex gap-2 items-center">
+					<Input
+						readOnly
+						value={
+							userAuthToken
+								? showToken
+									? userAuthToken
+									: `${userAuthToken.slice(0, 4)}${'•'.repeat(userAuthToken.length - 8)}${userAuthToken.slice(-4)}`
+								: 'Loading...'
+						}
+						className="text-xs h-8 font-mono bg-background"
+					/>
+					<Button
+						variant="outline"
+						size="icon"
+						className="h-8 w-8 shrink-0 cursor-pointer"
+						onClick={() => setShowToken(!showToken)}
+						disabled={!userAuthToken}
+					>
+						{showToken ? <EyeOff className="size-3" /> : <Eye className="size-3" />}
+					</Button>
+					<Button
+						variant="outline"
+						size="icon"
+						className="h-8 w-8 shrink-0 cursor-pointer"
+						onClick={handleCopyToken}
+						disabled={!userAuthToken}
+					>
+						{copied ? <span className="">✓</span> : <Copy className="size-3" />}
+					</Button>
+				</div>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">Base URL</label>
+				<Input
+					placeholder="https://api.openai.com/v1"
+					value={baseURL}
+					onChange={(e) => setBaseURL(e.target.value)}
+					className="text-xs h-8"
+				/>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">Model</label>
+				<Input
+					placeholder="gpt-5.2"
+					value={model}
+					onChange={(e) => setModel(e.target.value)}
+					className="text-xs h-8"
+				/>
+			</div>
+
+			<div className="flex flex-col gap-1.5">
+				<label className="text-xs text-muted-foreground">API Key</label>
+				<div className="flex gap-2 items-center">
+					<Input
+						type={showApiKey ? 'text' : 'password'}
+						placeholder="sk-..."
+						value={apiKey}
+						onChange={(e) => setApiKey(e.target.value)}
+						className="text-xs h-8"
+					/>
+					<Button
+						variant="outline"
+						size="icon"
+						className="h-8 w-8 shrink-0 cursor-pointer"
+						onClick={() => setShowApiKey(!showApiKey)}
+					>
+						{showApiKey ? <EyeOff className="size-3" /> : <Eye className="size-3" />}
+					</Button>
+				</div>
+			</div>
+
+			<div className="flex gap-2 mt-2">
+				<Button variant="outline" onClick={onClose} className="flex-1 h-8 text-xs cursor-pointer">
+					Cancel
+				</Button>
+				<Button
+					onClick={handleSave}
+					disabled={saving}
+					className="flex-1 h-8 text-xs cursor-pointer"
+				>
+					{saving ? <Loader2 className="size-3 animate-spin" /> : 'Save'}
+				</Button>
+			</div>
+
+			{/* Footer */}
+			<div className="mt-4 mb-4 pt-4 border-t border-border/50 flex gap-2 justify-between text-[10px] text-muted-foreground">
+				<div className="flex flex-col justify-between">
+					<a
+						href="https://github.com/alibaba/page-agent"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="flex items-center gap-1 hover:text-foreground"
+					>
+						<svg role="img" viewBox="0 0 24 24" className="size-3 fill-current">
+							<path d={siGithub.path} />
+						</svg>
+						<span>Source Code</span>
+					</a>
+
+					<a
+						href="https://alibaba.github.io/page-agent/"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="flex items-center gap-1 hover:text-foreground"
+					>
+						<Home className="size-3" />
+						<span>Home Page</span>
+					</a>
+
+					<a
+						href="https://github.com/alibaba/page-agent/blob/main/packages/extension/PRIVACY.md"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="flex items-center gap-1 hover:text-foreground"
+					>
+						<HatGlasses className="size-3" />
+						<span>Privacy Policy</span>
+					</a>
+				</div>
+
+				<div className="flex flex-col items-end">
+					<span>
+						Extension <span className="font-mono">v{__EXT_VERSION__}</span>
+					</span>
+					<span>
+						PageAgent <span className="font-mono">v{__CORE_VERSION__}</span>
+					</span>
+				</div>
+			</div>
+
+			{/* attribute */}
+			<div className="text-[10px] text-muted-foreground bg-background fixed bottom-0 w-full flex justify-around">
+				<span className="leading-loose">
+					Built with ♥️ by{' '}
+					<a
+						href="https://github.com/gaomeng1900"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="underline hover:text-foreground"
+					>
+						@Simon
+					</a>
+				</span>
+			</div>
+		</div>
+	)
+}

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

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

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

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

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

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

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

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

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

@@ -0,0 +1,46 @@
+import type { AgentStatus } from '@page-agent/core'
+
+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">
+			<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)} />
+}
+
+// Empty state with logo
+export function EmptyState() {
+	return (
+		<div className="flex flex-col items-center justify-center h-full gap-3 text-center px-6">
+			<Logo className="size-20 opacity-80" />
+			<div>
+				<h2 className="text-sm font-medium text-foreground">Page Agent Ext</h2>
+				<p className="text-xs text-muted-foreground mt-1">Enter a task to automate this page</p>
+			</div>
+		</div>
+	)
+}

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

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

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

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

packages/extension/src/lib/db.ts

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

packages/extension/src/lib/utils.ts

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

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

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

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

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

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

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

packages/extension/tsconfig.json

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

packages/extension/wxt.config.js

@@ -0,0 +1,63 @@
+import tailwindcss from '@tailwindcss/vite'
+import { mkdirSync, readFileSync } from 'node:fs'
+import { defineConfig } from 'wxt'
+
+const chromeProfile = '.wxt/chrome-data'
+mkdirSync(chromeProfile, { recursive: true })
+
+const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'))
+
+// See https://wxt.dev/api/config.html
+export default defineConfig({
+	srcDir: 'src',
+	modules: ['@wxt-dev/module-react'],
+	webExt: {
+		chromiumProfile: chromeProfile,
+		keepProfileChanges: true,
+		chromiumArgs: ['--hide-crash-restore-bubble'],
+	},
+	vite: () => ({
+		plugins: [tailwindcss()],
+		define: {
+			__EXT_VERSION__: JSON.stringify(pkg.version),
+			__CORE_VERSION__: JSON.stringify(pkg.dependencies['@page-agent/core']),
+		},
+		optimizeDeps: {
+			force: true,
+		},
+		build: {
+			minify: false,
+			chunkSizeWarningLimit: 2000,
+			cssCodeSplit: true,
+			rollupOptions: {
+				onwarn: function (message, handler) {
+					if (message.code === 'EVAL') return
+					handler(message)
+				},
+			},
+		},
+	}),
+	manifest: {
+		name: 'Page Agent Ext',
+		description:
+			'AI-powered browser automation assistant. Control web pages with natural language.',
+		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: 'Open Page Agent',
+		},
+		web_accessible_resources: [
+			{
+				resources: ['main-world.js'],
+				matches: ['*://*/*'],
+			},
+		],
+		side_panel: {
+			default_path: 'sidepanel/index.html',
+		},
+	},
+})

packages/llms/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@page-agent/llms",
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "main": "./dist/lib/page-agent-llms.js",
     "module": "./dist/lib/page-agent-llms.js",

packages/llms/src/OpenAIClient.ts

@@ -39,6 +39,8 @@ export class OpenAIClient implements LLMClient {
 				: 'required',
 		}
 
+		modelPatch(requestBody)
+
 		// 2. Call API
 		let response: Response
 		try {
@@ -48,12 +50,14 @@ export class OpenAIClient implements LLMClient {
 					'Content-Type': 'application/json',
 					Authorization: `Bearer ${this.config.apiKey}`,
 				},
-				body: JSON.stringify(modelPatch(requestBody)),
+				body: JSON.stringify(requestBody),
 				signal: abortSignal,
 			})
 		} catch (error: unknown) {
-			console.error(error)
+			const isAbortError = (error as any)?.name === 'AbortError'
-			throw new InvokeError(InvokeErrorType.NETWORK_ERROR, 'Network request failed', error)
+			const errorMessage = isAbortError ? 'Network request aborted' : 'Network request failed'
+			if (!isAbortError) console.error(error)
+			throw new InvokeError(InvokeErrorType.NETWORK_ERROR, errorMessage, error)
 		}
 
 		// 3. Handle HTTP errors
@@ -216,6 +220,7 @@ export class OpenAIClient implements LLMClient {
 				reasoningTokens: data.usage?.completion_tokens_details?.reasoning_tokens,
 			},
 			rawResponse: data,
+			rawRequest: requestBody,
 		}
 	}
 }

packages/llms/src/errors.ts

@@ -34,12 +34,15 @@ export class InvokeError extends Error {
 		super(message)
 		this.name = 'InvokeError'
 		this.type = type
-		this.retryable = this.isRetryable(type)
+		this.retryable = this.isRetryable(type, rawError)
 		this.rawError = rawError
 		this.rawResponse = rawResponse
 	}
 
-	private isRetryable(type: InvokeErrorType): boolean {
+	private isRetryable(type: InvokeErrorType, rawError?: unknown): boolean {
+		const isAbortError = (rawError as any)?.name === 'AbortError'
+		if (isAbortError) return false
+
 		const retryableTypes: InvokeErrorType[] = [
 			InvokeErrorType.NETWORK_ERROR,
 			InvokeErrorType.RATE_LIMIT,

packages/llms/src/index.ts

@@ -49,6 +49,9 @@ export class LLM extends EventTarget {
 	): Promise<InvokeResult> {
 		return await withRetry(
 			async () => {
+				// in case user aborted before invoking
+				if (abortSignal.aborted) throw new Error('AbortError')
+
 				const result = await this.client.invoke(messages, tools, abortSignal, options)
 
 				return result
@@ -88,12 +91,12 @@ async function withRetry<T>(
 		try {
 			return await fn()
 		} catch (error: unknown) {
+			// do not retry if aborted by user
+			if ((error as any)?.rawError?.name === 'AbortError') throw error
+
 			console.error(error)
 			settings.onError(error as Error)
 
-			// do not retry if aborted by user
-			if ((error as { name?: string })?.name === 'AbortError') throw error
-
 			// do not retry if error is not retryable (InvokeError)
 			if (error instanceof InvokeError && !error.retryable) throw error
 

packages/llms/src/types.ts

@@ -81,6 +81,7 @@ export interface InvokeResult<TResult = unknown> {
 		reasoningTokens?: number // OpenAI o1 series reasoning tokens
 	}
 	rawResponse?: unknown // Raw response for debugging
+	rawRequest?: unknown // Raw request for debugging
 }
 
 /**

packages/llms/src/utils.ts

@@ -2,7 +2,7 @@
  * Utility functions for LLM integration
  */
 import chalk from 'chalk'
-import { z } from 'zod'
+import * as z from 'zod'
 
 import type { Tool } from './types'
 
@@ -27,6 +27,7 @@ export function zodToOpenAITool(name: string, tool: Tool) {
 
 /**
  * Patch model specific parameters
+ * @note in-place modification
  */
 export function modelPatch(body: Record<string, any>) {
 	const model: string = body.model || ''
@@ -73,6 +74,10 @@ export function modelPatch(body: Record<string, any>) {
 		} else if (modelName.startsWith('gpt-51')) {
 			debug('Applying GPT-51 patch: disable reasoning')
 			body.reasoning_effort = 'none'
+		} else if (modelName.startsWith('gpt-5-mini')) {
+			debug('Applying GPT-5-mini patch: set reasoning effort to low, temperature to 1')
+			body.reasoning_effort = 'low'
+			body.temperature = 1
 		} else if (modelName.startsWith('gpt-5')) {
 			debug('Applying GPT-5 patch: set reasoning effort to low')
 			body.reasoning_effort = 'low'

packages/page-agent/package.json

@@ -1,7 +1,7 @@
 {
     "name": "page-agent",
     "private": false,
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "main": "./dist/esm/page-agent.js",
     "module": "./dist/esm/page-agent.js",
@@ -44,11 +44,11 @@
         "postpublish": "node -e \"['README.md','LICENSE'].forEach(f=>{try{require('fs').unlinkSync(f)}catch{}})\""
     },
     "dependencies": {
+        "@page-agent/core": "1.3.0",
+        "@page-agent/llms": "1.3.0",
+        "@page-agent/page-controller": "1.3.0",
+        "@page-agent/ui": "1.3.0",
         "chalk": "^5.6.2",
-        "zod": "^4.3.5",
+        "zod": "^4.3.5"
-        "@page-agent/llms": "1.0.0-beta.3",
-        "@page-agent/page-controller": "1.0.0-beta.3",
-        "@page-agent/core": "1.0.0-beta.3",
-        "@page-agent/ui": "1.0.0-beta.3"
     }
 }

packages/page-agent/vite.iife.config.js

@@ -3,6 +3,7 @@ import { config as dotenvConfig } from 'dotenv'
 import { dirname, resolve } from 'path'
 import { fileURLToPath } from 'url'
 import { defineConfig } from 'vite'
+// import { analyzer } from 'vite-bundle-analyzer'
 import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
 
 const __dirname = dirname(fileURLToPath(import.meta.url))
@@ -14,8 +15,11 @@ dotenvConfig({ path: resolve(__dirname, '../../.env') })
 // - alias all local packages so that they can be build in
 // - no external
 // - no d.ts. dts does not work with monorepo aliasing
-export default defineConfig(({ mode }) => ({
+export default defineConfig(() => ({
-	plugins: [cssInjectedByJsPlugin({ relativeCSSInjection: true })],
+	plugins: [
+		cssInjectedByJsPlugin({ relativeCSSInjection: true }),
+		// analyzer()
+	],
 	publicDir: false,
 	esbuild: {
 		keepNames: true,

packages/page-controller/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@page-agent/page-controller",
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "main": "./dist/lib/page-controller.js",
     "module": "./dist/lib/page-controller.js",

packages/page-controller/src/PageController.ts

@@ -80,6 +80,9 @@ export class PageController extends EventTarget {
 	/** last time the tree was updated */
 	private lastTimeUpdate = 0
 
+	/** Whether the tree has been indexed at least once */
+	private isIndexed = false
+
 	/** Visual mask overlay for blocking user interaction during automation */
 	private mask: InstanceType<typeof import('./mask/SimulatorMask').SimulatorMask> | null = null
 	private maskReady: Promise<void> | null = null
@@ -91,17 +94,18 @@ export class PageController extends EventTarget {
 
 		patchReact(this)
 
-		if (config.enableMask) {
+		if (config.enableMask) this.initMask()
-			this.maskReady = this.initMask()
-		}
 	}
 
 	/**
 	 * Initialize mask asynchronously (dynamic import to avoid CSS loading in Node)
 	 */
-	private async initMask(): Promise<void> {
+	initMask() {
-		const { SimulatorMask } = await import('./mask/SimulatorMask')
+		if (this.maskReady !== null) return
-		this.mask = new SimulatorMask()
+		this.maskReady = (async () => {
+			const { SimulatorMask } = await import('./mask/SimulatorMask')
+			this.mask = new SimulatorMask()
+		})()
 	}
 	// ======= State Queries =======
 
@@ -134,6 +138,8 @@ export class PageController extends EventTarget {
 		const content = this.simplifiedHTML
 
 		// Build header: page info + scroll position hint
+		const titleLine = `Current Page: [${title}](${url})`
+
 		const pageInfoLine = `Page info: ${pi.viewport_width}x${pi.viewport_height}px viewport, ${pi.page_width}x${pi.page_height}px total page size, ${pi.pages_above.toFixed(1)} pages above, ${pi.pages_below.toFixed(1)} pages below, ${pi.total_pages.toFixed(1)} total pages, at ${(pi.current_page_position * 100).toFixed(0)}% of page`
 
 		const elementsLabel =
@@ -147,7 +153,7 @@ export class PageController extends EventTarget {
 				? `... ${pi.pixels_above} pixels above (${pi.pages_above.toFixed(1)} pages) - scroll to see more ...`
 				: '[Start of page]'
 
-		const header = `${pageInfoLine}\n\n${elementsLabel}\n\n${scrollHintAbove}`
+		const header = `${titleLine}\n${pageInfoLine}\n\n${elementsLabel}\n\n${scrollHintAbove}`
 
 		// Build footer: scroll position hint
 		const hasContentBelow = pi.pixels_below > 4
@@ -188,7 +194,7 @@ export class PageController extends EventTarget {
 			interactiveBlacklist: blacklist,
 		})
 
-		this.simplifiedHTML = dom.flatTreeToString(this.flatTree, this.config.include_attributes)
+		this.simplifiedHTML = dom.flatTreeToString(this.flatTree, this.config.includeAttributes)
 
 		this.selectorMap.clear()
 		this.selectorMap = dom.getSelectorMap(this.flatTree)
@@ -196,6 +202,9 @@ export class PageController extends EventTarget {
 		this.elementTextMap.clear()
 		this.elementTextMap = dom.getElementTextMap(this.simplifiedHTML)
 
+		// Mark as indexed - now element actions are allowed
+		this.isIndexed = true
+
 		// Restore mask blocking
 		if (this.mask) {
 			this.mask.wrapper.style.pointerEvents = 'auto'
@@ -215,11 +224,22 @@ export class PageController extends EventTarget {
 
 	// ======= Element Actions =======
 
+	/**
+	 * Ensure the tree has been indexed before any index-based operation.
+	 * Throws if updateTree() hasn't been called yet.
+	 */
+	private assertIndexed(): void {
+		if (!this.isIndexed) {
+			throw new Error('DOM tree not indexed yet. Can not perform actions on elements.')
+		}
+	}
+
 	/**
 	 * Click element by index
 	 */
 	async clickElement(index: number): Promise<ActionResult> {
 		try {
+			this.assertIndexed()
 			const element = getElementByIndex(this.selectorMap, index)
 			const elemText = this.elementTextMap.get(index)
 			await clickElement(element)
@@ -228,7 +248,7 @@ export class PageController extends EventTarget {
 			if (element instanceof HTMLAnchorElement && element.target === '_blank') {
 				return {
 					success: true,
-					message: `✅ Clicked element (${elemText ?? index}). ⚠️ Link opens in a new tab. You are not capable of reading new tabs.`,
+					message: `✅ Clicked element (${elemText ?? index}). ⚠️ Link opened in a new tab.`,
 				}
 			}
 
@@ -249,6 +269,7 @@ export class PageController extends EventTarget {
 	 */
 	async inputText(index: number, text: string): Promise<ActionResult> {
 		try {
+			this.assertIndexed()
 			const element = getElementByIndex(this.selectorMap, index)
 			const elemText = this.elementTextMap.get(index)
 			await inputTextElement(element, text)
@@ -270,6 +291,7 @@ export class PageController extends EventTarget {
 	 */
 	async selectOption(index: number, optionText: string): Promise<ActionResult> {
 		try {
+			this.assertIndexed()
 			const element = getElementByIndex(this.selectorMap, index)
 			const elemText = this.elementTextMap.get(index)
 			await selectOptionElement(element as HTMLSelectElement, optionText)
@@ -298,6 +320,8 @@ export class PageController extends EventTarget {
 		try {
 			const { down, numPages, pixels, index } = options
 
+			this.assertIndexed()
+
 			const scrollAmount = pixels ?? numPages * (down ? 1 : -1) * window.innerHeight
 
 			const element = index !== undefined ? getElementByIndex(this.selectorMap, index) : null
@@ -327,6 +351,8 @@ export class PageController extends EventTarget {
 		try {
 			const { right, pixels, index } = options
 
+			this.assertIndexed()
+
 			const scrollAmount = pixels * (right ? 1 : -1)
 
 			const element = index !== undefined ? getElementByIndex(this.selectorMap, index) : null
@@ -369,7 +395,7 @@ export class PageController extends EventTarget {
 
 	/**
 	 * Show the visual mask overlay.
-	 * Only works if enableMask was set to true in config.
+	 * Only works after mask is setup.
 	 */
 	async showMask(): Promise<void> {
 		await this.maskReady
@@ -378,7 +404,7 @@ export class PageController extends EventTarget {
 
 	/**
 	 * Hide the visual mask overlay.
-	 * Only works if enableMask was set to true in config.
+	 * Only works after mask is setup.
 	 */
 	async hideMask(): Promise<void> {
 		await this.maskReady
@@ -394,6 +420,7 @@ export class PageController extends EventTarget {
 		this.selectorMap.clear()
 		this.elementTextMap.clear()
 		this.simplifiedHTML = '<EMPTY>'
+		this.isIndexed = false
 		this.mask?.dispose()
 		this.mask = null
 	}

packages/page-controller/src/dom/index.ts

@@ -10,7 +10,7 @@ import {
 export interface DomConfig {
 	interactiveBlacklist?: (Element | (() => Element))[]
 	interactiveWhitelist?: (Element | (() => Element))[]
-	include_attributes?: string[]
+	includeAttributes?: string[]
 	highlightOpacity?: number
 	highlightLabelOpacity?: number
 }
@@ -117,7 +117,7 @@ interface TreeNode {
  *
  * @todo 数据脱敏过滤器
  */
-export function flatTreeToString(flatTree: FlatDomTree, include_attributes?: string[]): string {
+export function flatTreeToString(flatTree: FlatDomTree, includeAttributes?: string[]): string {
 	const DEFAULT_INCLUDE_ATTRIBUTES = [
 		'title',
 		'type',
@@ -146,7 +146,7 @@ export function flatTreeToString(flatTree: FlatDomTree, include_attributes?: str
 		'aria-owns',
 	]
 
-	const includeAttrs = [...(include_attributes || []), ...DEFAULT_INCLUDE_ATTRIBUTES]
+	const includeAttrs = [...(includeAttributes || []), ...DEFAULT_INCLUDE_ATTRIBUTES]
 
 	// Helper function to cap text length
 	const capTextLength = (text: string, maxLength: number): string => {

packages/page-controller/src/mask/SimulatorMask.module.css

@@ -2,8 +2,7 @@
 	position: fixed;
 	inset: 0;
 	z-index: 2147483641; /* 确保在所有元素之上，除了 panel */
-	/* pointer-events: none; */
+	cursor: wait;
-	cursor: not-allowed;
 	overflow: hidden;
 
 	display: none;

packages/page-controller/src/mask/SimulatorMask.ts

@@ -6,6 +6,7 @@ import styles from './SimulatorMask.module.css'
 import cursorStyles from './cursor.module.css'
 
 export class SimulatorMask {
+	shown: boolean = false
 	wrapper = document.createElement('div')
 	motion = new Motion({
 		mode: isPageDark() ? 'dark' : 'light',
@@ -140,6 +141,9 @@ export class SimulatorMask {
 	}
 
 	show() {
+		if (this.shown) return
+
+		this.shown = true
 		this.motion.start()
 		this.motion.fadeIn()
 
@@ -155,6 +159,9 @@ export class SimulatorMask {
 	}
 
 	hide() {
+		if (!this.shown) return
+
+		this.shown = false
 		this.motion.fadeOut()
 		this.motion.pause()
 

packages/page-controller/src/mask/cursor-border.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none">
+  <g><path d="M 15 42 L 15 36.99 Q 15 31.99 23.7 31.99 L 28.05 31.99 Q 32.41 31.99 32.41 21.99 L 32.41 17 Q 32.41 12 41.09 16.95 L 76.31 37.05 Q 85 42 76.31 46.95 L 41.09 67.05 Q 32.41 72 32.41 62.01 L 32.41 57.01 Q 32.41 52.01 23.7 52.01 L 19.35 52.01 Q 15 52.01 15 47.01 Z" fill="none" stroke="#000000" stroke-width="6" stroke-miterlimit="10" style="stroke: light-dark(rgb(0, 0, 0), rgb(255, 255, 255));"/></g>
+</svg>

packages/page-controller/src/mask/cursor-fill.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <defs>
+  </defs>
+  <g xmlns="http://www.w3.org/2000/svg" style="filter: drop-shadow(light-dark(rgba(0, 0, 0, 0.4), rgba(237, 237, 237, 0.4)) 3px 4px 4px);"><path d="M 15 42 L 15 36.99 Q 15 31.99 23.7 31.99 L 28.05 31.99 Q 32.41 31.99 32.41 21.99 L 32.41 17 Q 32.41 12 41.09 16.95 L 76.31 37.05 Q 85 42 76.31 46.95 L 41.09 67.05 Q 32.41 72 32.41 62.01 L 32.41 57.01 Q 32.41 52.01 23.7 52.01 L 19.35 52.01 Q 15 52.01 15 47.01 Z" fill="#ffffff" stroke="none" style="fill: #ffffff;"/></g>
+</svg>

packages/page-controller/src/mask/cursor.module.css

@@ -5,80 +5,59 @@
 	height: var(--cursor-size, 75px);
 	pointer-events: none;
 	z-index: 10000;
-	transform: translate(-30%, -30%);
-
-	animation: cursor-enter 300ms ease-out forwards;
 }
 
 .cursorBorder {
 	position: absolute;
-	inset: 0;
+	width: 100%;
+	height: 100%;
 	background: linear-gradient(45deg, rgb(57, 182, 255), rgb(189, 69, 251));
-	mask-image: url(https://img.alicdn.com/imgextra/i1/O1CN01YHLVYR1LvqWIyo5kH_!!6000000001362-2-tps-202-202.png);
+	mask-image: url(./cursor-border.svg);
 	mask-size: 100% 100%;
 	mask-repeat: no-repeat;
-	animation: cursor-breathe 2s ease-in-out infinite;
+
+	transform-origin: center;
+	transform: rotate(-135deg) scale(1.2);
+	margin-left: -10px;
+	margin-top: -18px;
 }
 
 .cursorFilling {
 	position: absolute;
-	inset: 0;
+	width: 100%;
-	background: url(https://img.alicdn.com/imgextra/i3/O1CN01JZOqOS1Tu1sIKbPLW_!!6000000002441-2-tps-202-202.png);
+	height: 100%;
+	background: url(./cursor-fill.svg);
 	background-size: 100% 100%;
 	background-repeat: no-repeat;
+
+	transform-origin: center;
+	transform: rotate(-135deg) scale(1.2);
+	margin-left: -10px;
+	margin-top: -18px;
 }
 
 .cursorRipple {
 	position: absolute;
-	inset: 0;
+	width: 100%;
+	height: 100%;
 	pointer-events: none;
+	margin-left: -50%;
+	margin-top: -50%;
+
+	&::after {
+		content: '';
+		opacity: 0;
+		position: absolute;
+		inset: 0;
+		border: 4px solid rgba(57, 182, 255, 1);
+		border-radius: 50%;
+	}
 }
 
 .cursor.clicking .cursorRipple::after {
-	content: '';
-	position: absolute;
-	width: 100%;
-	height: 100%;
-	left: -30%;
-	top: -30%;
-	border: 4px solid rgba(57, 182, 255, 1);
-	border-radius: 50%;
 	animation: cursor-ripple 300ms ease-out forwards;
 }
 
-/* 光标动画关键帧 */
-@keyframes cursor-breathe {
-	0%,
-	100% {
-		transform: scale(1);
-		opacity: 0.9;
-	}
-	50% {
-		transform: scale(1.05);
-		opacity: 1;
-	}
-}
-
-@keyframes cursor-rotate {
-	0% {
-		transform: rotate(0deg);
-	}
-	100% {
-		transform: rotate(360deg);
-	}
-}
-
-@keyframes cursor-enter {
-	0% {
-		transform: translate(-30%, -30%) scale(0.5);
-		opacity: 0;
-	}
-	100% {
-		transform: translate(-30%, -30%) scale(1);
-		opacity: 1;
-	}
-}
-
 @keyframes cursor-ripple {
 	0% {
 		transform: scale(0);

packages/ui/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@page-agent/ui",
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "main": "./dist/lib/page-agent-ui.js",
     "module": "./dist/lib/page-agent-ui.js",

packages/ui/src/i18n/locales.ts

@@ -12,6 +12,7 @@ const enUS = {
 			question: 'Question: {{question}}',
 			waitingPlaceholder: 'Waiting for task to start...',
 			stop: 'Stop',
+			close: 'Close',
 			expand: 'Expand history',
 			collapse: 'Collapse history',
 			step: 'Step {{number}} · {{time}}{{duration}}',
@@ -59,6 +60,7 @@ const zhCN = {
 			question: '询问: {{question}}',
 			waitingPlaceholder: '等待任务开始...',
 			stop: '终止',
+			close: '关闭',
 			expand: '展开历史',
 			collapse: '收起历史',
 			step: '步骤 {{number}} · {{time}}{{duration}}',

packages/ui/src/index.ts

@@ -1,3 +1,2 @@
 export { Panel, type PanelConfig } from './panel/Panel'
-export type { AgentActivity, PanelAgentAdapter } from './panel/types'
 export { I18n, type SupportedLanguage, type TranslationKey } from './i18n'

packages/ui/src/panel/Panel.ts

@@ -33,7 +33,7 @@ export class Panel {
 	#statusText: HTMLElement
 	#historySection: HTMLElement
 	#expandButton: HTMLElement
-	#stopButton: HTMLElement
+	#actionButton: HTMLElement
 	#inputSection: HTMLElement
 	#taskInput: HTMLInputElement
 
@@ -76,7 +76,7 @@ export class Panel {
 		this.#statusText = this.#wrapper.querySelector(`.${styles.statusText}`)!
 		this.#historySection = this.#wrapper.querySelector(`.${styles.historySection}`)!
 		this.#expandButton = this.#wrapper.querySelector(`.${styles.expandButton}`)!
-		this.#stopButton = this.#wrapper.querySelector(`.${styles.stopButton}`)!
+		this.#actionButton = this.#wrapper.querySelector(`.${styles.stopButton}`)!
 		this.#inputSection = this.#wrapper.querySelector(`.${styles.inputSectionWrapper}`)!
 		this.#taskInput = this.#wrapper.querySelector(`.${styles.taskInput}`)!
 
@@ -105,6 +105,15 @@ export class Panel {
 			status === 'running' ? 'thinking' : status === 'idle' ? 'thinking' : status
 		this.#updateStatusIndicator(indicatorType)
 
+		// Morph action button: running = stop (■), not running = close (X)
+		if (status === 'running') {
+			this.#actionButton.textContent = '■'
+			this.#actionButton.title = this.#i18n.t('ui.panel.stop')
+		} else {
+			this.#actionButton.textContent = 'X'
+			this.#actionButton.title = this.#i18n.t('ui.panel.close')
+		}
+
 		// Show/hide based on status
 		if (status === 'running') {
 			this.show()
@@ -266,10 +275,14 @@ export class Panel {
 	}
 
 	/**
-	 * Stop Agent
+	 * Action button handler: stop when running, close (dispose) when idle
 	 */
-	#stopAgent(): void {
+	#handleActionButton(): void {
-		this.#agent.dispose()
+		if (this.#agent.status === 'running') {
+			this.#agent.stop()
+		} else {
+			this.#agent.dispose()
+		}
 	}
 
 	/**
@@ -383,7 +396,7 @@ export class Panel {
 					<button class="${styles.controlButton} ${styles.expandButton}" title="${this.#i18n.t('ui.panel.expand')}">
 						▼
 					</button>
-					<button class="${styles.controlButton} ${styles.stopButton}" title="${this.#i18n.t('ui.panel.stop')}">
+					<button class="${styles.controlButton} ${styles.stopButton}" title="${this.#i18n.t('ui.panel.close')}">
 						X
 					</button>
 				</div>
@@ -420,10 +433,10 @@ export class Panel {
 			this.#toggle()
 		})
 
-		// Stop button
+		// Action button (stop / close)
-		this.#stopButton.addEventListener('click', (e) => {
+		this.#actionButton.addEventListener('click', (e) => {
 			e.stopPropagation()
-			this.#stopAgent()
+			this.#handleActionButton()
 		})
 
 		// Submit on Enter key in input field
@@ -608,6 +621,13 @@ export class Panel {
 			)
 		} else if (event.type === 'user_takeover') {
 			cards.push(createCard({ icon: '👤', content: 'User takeover', meta, type: 'input' }))
+		} else if (event.type === 'retry') {
+			const retryInfo = `${event.message || 'Retrying'} (${event.attempt}/${event.maxAttempts})`
+			cards.push(createCard({ icon: '🔄', content: retryInfo, meta, type: 'observation' }))
+		} else if (event.type === 'error') {
+			cards.push(
+				createCard({ icon: '❌', content: event.message || 'Error', meta, type: 'observation' })
+			)
 		}
 
 		return cards

packages/ui/src/panel/types.ts

@@ -33,7 +33,7 @@ export interface PanelAgentAdapter extends EventTarget {
 
 	/** History of agent events */
 	readonly history: readonly {
-		type: 'step' | 'observation' | 'user_takeover' | 'error'
+		type: 'step' | 'observation' | 'user_takeover' | 'retry' | 'error'
 		stepIndex?: number
 		/** For 'step' type */
 		reflection?: {
@@ -49,6 +49,11 @@ export interface PanelAgentAdapter extends EventTarget {
 		}
 		/** For 'observation' type */
 		content?: string
+		/** For 'retry' type */
+		attempt?: number
+		maxAttempts?: number
+		/** For 'retry' and 'error' types */
+		message?: string
 	}[]
 
 	/** Current task being executed */
@@ -63,6 +68,9 @@ export interface PanelAgentAdapter extends EventTarget {
 	/** Execute a task */
 	execute(task: string): Promise<unknown>
 
-	/** Dispose the agent */
+	/** Stop the current task (agent remains reusable) */
+	stop(): void
+
+	/** Dispose the agent (terminal, cannot be reused) */
 	dispose(): void
 }

packages/website/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@page-agent/website",
     "private": true,
-    "version": "1.0.0-beta.3",
+    "version": "1.3.0",
     "type": "module",
     "scripts": {
         "dev": "vite --host 0.0.0.0",
@@ -10,33 +10,26 @@
         "typecheck": "tsc --noEmit"
     },
     "devDependencies": {
-        "@tailwindcss/vite": "^4.1.18",
-        "@types/react": "^19.2.8",
-        "@types/react-dom": "^19.2.1",
-        "@vitejs/plugin-react-swc": "^4.1.0",
-        "i18next": "^25.7.4",
-        "i18next-browser-languagedetector": "^8.2.0",
-        "react": "^19.2.3",
-        "react-dom": "^19.2.3",
-        "react-i18next": "^16.5.3",
-        "tailwindcss": "^4.1.14",
-        "tw-animate-css": "^1.4.0",
-        "wouter": "^3.9.0"
-    },
-    "dependencies": {
         "@radix-ui/react-icons": "^1.3.2",
         "@radix-ui/react-separator": "^1.1.8",
         "@radix-ui/react-slot": "^1.2.4",
         "@radix-ui/react-switch": "^1.2.6",
         "@radix-ui/react-tooltip": "^1.2.8",
+        "@types/react": "^19.2.13",
+        "@types/react-dom": "^19.2.1",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
-        "lucide-react": "^0.562.0",
+        "lucide-react": "^0.563.0",
-        "motion": "^12.27.1",
+        "motion": "^12.34.0",
         "next-themes": "^0.4.6",
+        "react": "^19.2.4",
+        "react-dom": "^19.2.4",
         "rough-notation": "^0.5.1",
-        "simple-icons": "^16.6.0",
+        "simple-icons": "^16.8.0",
         "sonner": "^2.0.7",
-        "tailwind-merge": "^3.4.0"
+        "tailwind-merge": "^3.4.0",
+        "tailwindcss": "^4.1.14",
+        "tw-animate-css": "^1.4.0",
+        "wouter": "^3.9.0"
     }
 }

packages/website/src/components/BetaNotice.tsx

@@ -1,7 +1,7 @@
-import { useTranslation } from 'react-i18next'
+import { useLanguage } from '@/i18n/context'
 
 export default function BetaNotice() {
-	const { t } = useTranslation('common')
+	const { isZh } = useLanguage()
 
 	return (
 		<div className="bg-orange-50 dark:bg-orange-900/20 border border-orange-200 dark:border-orange-800 rounded-lg p-4 mb-8">
@@ -11,9 +11,13 @@ export default function BetaNotice() {
 				</div>
 				<div className="ml-3">
 					<h3 className="text-sm font-medium text-orange-800 dark:text-orange-200 mb-1">
-						{t('beta_notice.title')}
+						{isZh ? 'Beta 阶段' : 'Beta Stage'}
 					</h3>
-					<p className="text-sm text-orange-700 dark:text-orange-300">{t('beta_notice.content')}</p>
+					<p className="text-sm text-orange-700 dark:text-orange-300">
+						{isZh
+							? '当前功能未完成，接口可能随时变更。正式版本发布前请勿用于生产环境。'
+							: 'Current features are incomplete and the API may change at any time. Please do not use in production environments before the official release.'}
+					</p>
 				</div>
 			</div>
 		</div>

packages/website/src/components/Footer.tsx

@@ -1,8 +1,9 @@
-import { useTranslation } from 'react-i18next'
 import { siGithub } from 'simple-icons'
 
+import { useLanguage } from '@/i18n/context'
+
 export default function Footer() {
-	const { t } = useTranslation('common')
+	const { isZh } = useLanguage()
 
 	return (
 		<footer
@@ -11,14 +12,16 @@ export default function Footer() {
 		>
 			<div className="max-w-7xl mx-auto px-6 py-6">
 				<div className="flex flex-col md:flex-row justify-between items-center space-y-4 md:space-y-0">
-					<p className="text-gray-600 dark:text-gray-300 text-sm">{t('footer.copyright')}</p>
+					<p className="text-gray-600 dark:text-gray-300 text-sm">
+						© 2026 page-agent. All rights reserved.
+					</p>
 					<div className="flex items-center space-x-6">
 						<a
 							href="https://github.com/alibaba/page-agent"
 							target="_blank"
 							rel="noopener noreferrer"
 							className="text-gray-600 dark:text-gray-300 hover:text-gray-900 dark:hover:text-white transition-colors duration-200"
-							aria-label={t('footer.github_label')}
+							aria-label={isZh ? '访问 GitHub 仓库' : 'Visit GitHub repository'}
 						>
 							<svg
 								role="img"

packages/website/src/components/Header.tsx

@@ -1,15 +1,16 @@
 import { BookOpen, Menu, X } from 'lucide-react'
 import { useState } from 'react'
-import { useTranslation } from 'react-i18next'
 import { siGithub } from 'simple-icons'
 import { Link } from 'wouter'
 
+import { useLanguage } from '@/i18n/context'
+
 import LanguageSwitcher from './LanguageSwitcher'
 import ThemeSwitcher from './ThemeSwitcher'
 import { HyperText } from './ui/hyper-text'
 
 export default function Header() {
-	const { t } = useTranslation('common')
+	const { isZh } = useLanguage()
 	const [mobileMenuOpen, setMobileMenuOpen] = useState(false)
 
 	return (
@@ -24,7 +25,7 @@ export default function Header() {
 						<Link
 							href="~/"
 							className="flex items-center gap-2 sm:gap-3 group shrink-0"
-							aria-label={t('header.logo_alt')}
+							aria-label={isZh ? 'page-agent 首页' : 'page-agent home'}
 							onClick={() => setMobileMenuOpen(false)}
 						>
 							<img
@@ -43,7 +44,7 @@ export default function Header() {
 									animateOnHover={true}
 									aria-hidden="true"
 								>
-									{t('header.slogan')}
+									GUI Agent in your webpage
 								</HyperText>
 							</div>
 						</Link>
@@ -57,7 +58,7 @@ export default function Header() {
 							<Link
 								href="~/docs/introduction/overview"
 								className="p-2 rounded-lg text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-800 hover:text-blue-600 dark:hover:text-blue-400 transition-colors duration-200 shrink-0"
-								aria-label={t('header.nav_docs')}
+								aria-label={isZh ? '文档' : 'Docs'}
 							>
 								<BookOpen className="w-5 h-5" />
 							</Link>
@@ -66,7 +67,7 @@ export default function Header() {
 								target="_blank"
 								rel="noopener noreferrer"
 								className="p-2 rounded-lg text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-800 hover:text-blue-600 dark:hover:text-blue-400 transition-colors duration-200 shrink-0"
-								aria-label={t('header.nav_source')}
+								aria-label="GitHub"
 							>
 								<svg
 									role="img"
@@ -83,7 +84,7 @@ export default function Header() {
 						<nav
 							className="hidden md:flex items-center space-x-6"
 							role="navigation"
-							aria-label={t('header.nav_docs')}
+							aria-label={isZh ? '文档' : 'Docs'}
 						>
 							<span className="text-xs font-mono text-gray-400 dark:text-gray-500 tabular-nums before:content-['v']">
 								{import.meta.env.VERSION}
@@ -93,14 +94,14 @@ export default function Header() {
 								className="flex items-center gap-1.5 text-gray-600 dark:text-gray-300 hover:text-blue-600 dark:hover:text-blue-400 transition-colors duration-200"
 							>
 								<BookOpen className="w-4 h-4" />
-								{t('header.nav_docs')}
+								{isZh ? '文档' : 'Docs'}
 							</Link>
 							<a
 								href="https://github.com/alibaba/page-agent"
 								target="_blank"
 								rel="noopener noreferrer"
 								className="flex items-center gap-1.5 text-gray-600 dark:text-gray-300 hover:text-blue-600 dark:hover:text-blue-400 transition-colors duration-200"
-								aria-label={t('header.nav_source')}
+								aria-label="GitHub"
 							>
 								<svg
 									role="img"
@@ -110,7 +111,7 @@ export default function Header() {
 								>
 									<path d={siGithub.path} />
 								</svg>
-								{t('header.nav_source')}
+								GitHub
 							</a>
 							<ThemeSwitcher />
 							<LanguageSwitcher />
@@ -120,7 +121,7 @@ export default function Header() {
 						<button
 							type="button"
 							className="md:hidden p-2 rounded-lg text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors duration-200 shrink-0"
-							aria-label={t('header.mobile_menu')}
+							aria-label={isZh ? '打开导航栏' : 'Open navigation'}
 							aria-expanded={mobileMenuOpen}
 							aria-controls="mobile-menu"
 							onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
@@ -142,14 +143,14 @@ export default function Header() {
 								onClick={() => setMobileMenuOpen(false)}
 							>
 								<BookOpen className="w-5 h-5" />
-								{t('header.nav_docs')}
+								{isZh ? '文档' : 'Docs'}
 							</Link>
 							<a
 								href="https://github.com/alibaba/page-agent"
 								target="_blank"
 								rel="noopener noreferrer"
 								className="flex items-center gap-2 px-3 py-2 rounded-lg text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-800 hover:text-blue-600 dark:hover:text-blue-400 transition-colors duration-200"
-								aria-label={t('header.nav_source')}
+								aria-label="GitHub"
 							>
 								<svg
 									role="img"
@@ -159,7 +160,7 @@ export default function Header() {
 								>
 									<path d={siGithub.path} />
 								</svg>
-								{t('header.nav_source')}
+								GitHub
 							</a>
 							<div className="flex items-center gap-3 px-3 py-2">
 								<ThemeSwitcher />

packages/website/src/components/HighlightSyntax.module.css

@@ -3,6 +3,8 @@
 	word-break: break-word;
 	overflow-wrap: break-word;
 	font-family: monospace;
+	font-size: 13px;
+	line-height: 1;
 	color: #171717;
 }
 

packages/website/src/components/LanguageSwitcher.tsx

@@ -1,22 +1,21 @@
 import { useEffect, useRef, useState } from 'react'
-import { useTranslation } from 'react-i18next'
+
+import { useLanguage } from '@/i18n/context'
 
 export default function LanguageSwitcher() {
-	const { i18n, t } = useTranslation('common')
+	const { language, isZh, setLanguage } = useLanguage()
 	const [isOpen, setIsOpen] = useState(false)
 	const dropdownRef = useRef<HTMLDivElement>(null)
 
-	const currentLang = i18n.language
-
 	const languages = [
-		{ code: 'zh-CN', label: '中文' },
+		{ code: 'zh-CN' as const, label: '中文' },
-		{ code: 'en-US', label: 'English' },
+		{ code: 'en-US' as const, label: 'English' },
 	]
 
-	const currentLanguage = languages.find((lang) => lang.code === currentLang) || languages[0]
+	const currentLanguage = languages.find((lang) => lang.code === language) || languages[0]
 
-	const handleLanguageChange = (langCode: string) => {
+	const handleLanguageChange = (langCode: 'zh-CN' | 'en-US') => {
-		i18n.changeLanguage(langCode)
+		setLanguage(langCode)
 		setIsOpen(false)
 	}
 
@@ -42,7 +41,7 @@ export default function LanguageSwitcher() {
 			<button
 				onClick={() => setIsOpen(!isOpen)}
 				className="flex items-center gap-2 px-3 py-1.5 rounded-lg bg-gray-100 dark:bg-gray-800 hover:bg-gray-200 dark:hover:bg-gray-700 transition-colors text-sm font-medium border border-gray-200 dark:border-gray-700 text-gray-700 dark:text-gray-300"
-				aria-label={t('language.switch_label')}
+				aria-label={isZh ? '切换语言' : 'Switch language'}
 				aria-expanded={isOpen}
 				aria-haspopup="true"
 			>
@@ -83,14 +82,14 @@ export default function LanguageSwitcher() {
 							key={lang.code}
 							onClick={() => handleLanguageChange(lang.code)}
 							className={`w-full flex items-center gap-2 px-4 py-2 text-sm text-left hover:bg-gray-100 dark:hover:bg-gray-700 transition-colors ${
-								currentLang === lang.code
+								language === lang.code
 									? 'bg-blue-50 dark:bg-blue-900/20 text-blue-700 dark:text-blue-300'
 									: 'text-gray-700 dark:text-gray-300'
 							}`}
 							role="menuitem"
 						>
 							<span>{lang.label}</span>
-							{currentLang === lang.code && (
+							{language === lang.code && (
 								<svg
 									className="w-4 h-4 ml-auto"
 									fill="none"