diff --git a/packages/page-agent/package.json b/packages/page-agent/package.json
new file mode 100644
index 0000000..b0224a0
--- /dev/null
+++ b/packages/page-agent/package.json
@@ -0,0 +1,53 @@
+{
+    "name": "page-agent",
+    "private": false,
+    "version": "0.2.5",
+    "type": "module",
+    "main": "./dist/esm/page-agent.js",
+    "module": "./dist/esm/page-agent.js",
+    "types": "./dist/esm/PageAgent.d.ts",
+    "exports": {
+        ".": {
+            "types": "./dist/esm/PageAgent.d.ts",
+            "import": "./dist/esm/page-agent.js",
+            "default": "./dist/esm/page-agent.js"
+        }
+    },
+    "files": [
+        "dist/"
+    ],
+    "description": "GUI agent for web applications - add intelligent automation to any webpage with a single script",
+    "keywords": [
+        "ai",
+        "automation",
+        "ui-agent",
+        "GUI-agent",
+        "browser-automation",
+        "web-agent",
+        "llm",
+        "dom-interaction",
+        "web-automation",
+        "GUI-simulation"
+    ],
+    "author": "Simon<gaomeng1900>",
+    "license": "MIT",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/alibaba/page-agent.git"
+    },
+    "homepage": "https://alibaba.github.io/page-agent/",
+    "scripts": {
+        "build": "vite build",
+        "dev:iife": "concurrently \"vite build --config vite.iife.config.js --watch\" \"npx serve dist/iife -p 5174\"",
+        "prepublishOnly": "node -e \"const fs=require('fs');['README.md','LICENSE'].forEach(f=>fs.copyFileSync('../../'+f,f))\"",
+        "postpublish": "node -e \"['README.md','LICENSE'].forEach(f=>{try{require('fs').unlinkSync(f)}catch{}})\""
+    },
+    "dependencies": {
+        "chalk": "^5.6.2",
+        "zod": "^4.3.5",
+        "@page-agent/llms": "0.2.5",
+        "@page-agent/page-controller": "0.2.5",
+        "@page-agent/core": "0.2.5",
+        "@page-agent/ui": "0.2.5"
+    }
+}
diff --git a/packages/page-agent/src/PageAgent.ts b/packages/page-agent/src/PageAgent.ts
new file mode 100644
index 0000000..31ef902
--- /dev/null
+++ b/packages/page-agent/src/PageAgent.ts
@@ -0,0 +1,19 @@
+/**
+ * Copyright (C) 2025 Alibaba Group Holding Limited
+ * All rights reserved.
+ */
+import { type PageAgentConfig, PageAgentCore } from '@page-agent/core'
+import { Panel } from '@page-agent/ui'
+
+export type { PageAgentConfig }
+
+export class PageAgent extends PageAgentCore {
+	panel: Panel
+
+	constructor(config: PageAgentConfig) {
+		super(config)
+		this.panel = new Panel(this, {
+			language: config.language,
+		})
+	}
+}
diff --git a/packages/page-agent/src/env.d.ts b/packages/page-agent/src/env.d.ts
new file mode 100644
index 0000000..21d2cd5
--- /dev/null
+++ b/packages/page-agent/src/env.d.ts
@@ -0,0 +1,9 @@
+/// <reference types="vite/client" />
+import type { PageAgent } from './PageAgent'
+
+declare global {
+	interface Window {
+		pageAgent?: PageAgent
+		PageAgent: typeof PageAgent
+	}
+}
diff --git a/packages/page-agent/src/iife.ts b/packages/page-agent/src/iife.ts
new file mode 100644
index 0000000..81830ed
--- /dev/null
+++ b/packages/page-agent/src/iife.ts
@@ -0,0 +1,52 @@
+/**
+ * Auto-run entry for page-agent.js. Insert this script into your page to get page-agent functionality.
+ */
+import { Panel } from '@page-agent/ui'
+
+import { PageAgent, type PageAgentConfig } from './PageAgent'
+
+// Clean up existing instances to prevent multiple injections from bookmarklet
+if (window.pageAgent) {
+	window.pageAgent.dispose()
+}
+
+// Mount to global window object
+window.PageAgent = PageAgent
+
+// Export for ES module usage
+// export { PageAgent }
+
+console.log('🚀 page-agent.js loaded!')
+
+const DEMO_MODEL = 'PAGE-AGENT-FREE-TESTING-RANDOM'
+const DEMO_BASE_URL = 'https://hwcxiuzfylggtcktqgij.supabase.co/functions/v1/llm-testing-proxy'
+const DEMO_API_KEY = 'PAGE-AGENT-FREE-TESTING-RANDOM'
+
+// in case document.x is not ready yet
+// @todo give a switch to disable auto-init
+setTimeout(() => {
+	const currentScript = document.currentScript as HTMLScriptElement | null
+	let config: PageAgentConfig
+
+	if (currentScript) {
+		console.log('🚀 page-agent.js detected current script:', currentScript.src)
+		const url = new URL(currentScript.src)
+		const model = url.searchParams.get('model') || DEMO_MODEL
+		const baseURL = url.searchParams.get('baseURL') || DEMO_BASE_URL
+		const apiKey = url.searchParams.get('apiKey') || DEMO_API_KEY
+		const language = (url.searchParams.get('lang') as 'zh-CN' | 'en-US') || 'zh-CN'
+		config = { model, baseURL, apiKey, language }
+	} else {
+		console.log('🚀 page-agent.js no current script detected, using default demo config')
+		config = {
+			model: import.meta.env.LLM_MODEL_NAME ? import.meta.env.LLM_MODEL_NAME : DEMO_MODEL,
+			baseURL: import.meta.env.LLM_BASE_URL ? import.meta.env.LLM_BASE_URL : DEMO_BASE_URL,
+			apiKey: import.meta.env.LLM_API_KEY ? import.meta.env.LLM_API_KEY : DEMO_API_KEY,
+		}
+	}
+
+	// Create agent
+	window.pageAgent = new PageAgent(config)
+
+	console.log('🚀 page-agent.js initialized with config:', window.pageAgent.config)
+})
diff --git a/packages/page-agent/tsconfig.dts.json b/packages/page-agent/tsconfig.dts.json
new file mode 100644
index 0000000..70eceb9
--- /dev/null
+++ b/packages/page-agent/tsconfig.dts.json
@@ -0,0 +1,9 @@
+{
+    "extends": "./tsconfig.json",
+    "compilerOptions": {
+        // @workaround DTS bug
+        // dts do not work with monorepo path mapping
+        // disable path mapping for it
+        "paths": {}
+    }
+}
diff --git a/packages/page-agent/tsconfig.json b/packages/page-agent/tsconfig.json
new file mode 100644
index 0000000..8f1362c
--- /dev/null
+++ b/packages/page-agent/tsconfig.json
@@ -0,0 +1,26 @@
+{
+    "extends": "../../tsconfig.base.json",
+    "compilerOptions": {
+        "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.tsbuildinfo",
+        "noEmit": false,
+        "allowImportingTsExtensions": false,
+        "baseUrl": ".",
+        "outDir": "dist",
+        "paths": {
+            //
+            "@page-agent/llms": ["../llms/src/index.ts"],
+            "@page-agent/page-controller": ["../page-controller/src/PageController.ts"],
+            "@page-agent/core": ["../core/src/PageAgentCore.ts"],
+            "@page-agent/ui": ["../ui/src/index.ts"]
+        }
+    },
+    "include": ["**/*.ts"],
+    "exclude": ["dist", "node_modules"],
+    "references": [
+        //
+        { "path": "../llms" },
+        { "path": "../page-controller" },
+        { "path": "../core" },
+        { "path": "../ui" }
+    ]
+}
diff --git a/packages/page-agent/vite.config.js b/packages/page-agent/vite.config.js
new file mode 100644
index 0000000..bc210ec
--- /dev/null
+++ b/packages/page-agent/vite.config.js
@@ -0,0 +1,44 @@
+// @ts-check
+import { dirname, resolve } from 'path'
+import dts from 'unplugin-dts/vite'
+import { fileURLToPath } from 'url'
+import { defineConfig } from 'vite'
+import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+
+// ES Module for NPM Package
+export default defineConfig({
+	clearScreen: false,
+	plugins: [
+		dts({ tsconfigPath: './tsconfig.dts.json', bundleTypes: true }),
+		cssInjectedByJsPlugin({ relativeCSSInjection: true }),
+	],
+	publicDir: false,
+	esbuild: {
+		keepNames: true,
+	},
+	build: {
+		lib: {
+			entry: resolve(__dirname, 'src/PageAgent.ts'),
+			name: 'PageAgent',
+			fileName: 'page-agent',
+			formats: ['es'],
+		},
+		outDir: resolve(__dirname, 'dist', 'esm'),
+		rollupOptions: {
+			external: [
+				'chalk',
+				'zod',
+				// all the internal packages
+				/^@page-agent\//,
+			],
+		},
+		minify: false,
+		sourcemap: true,
+		cssCodeSplit: true,
+	},
+	define: {
+		'process.env.NODE_ENV': '"production"',
+	},
+})
diff --git a/packages/page-agent/vite.iife.config.js b/packages/page-agent/vite.iife.config.js
new file mode 100644
index 0000000..cf53902
--- /dev/null
+++ b/packages/page-agent/vite.iife.config.js
@@ -0,0 +1,57 @@
+// @ts-check
+import { config as dotenvConfig } from 'dotenv'
+import { dirname, resolve } from 'path'
+import { fileURLToPath } from 'url'
+import { defineConfig } from 'vite'
+import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+
+// Load .env from repo root
+dotenvConfig({ path: resolve(__dirname, '../../.env') })
+
+// UMD Bundle for CDN
+// - 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 }) => ({
+	plugins: [cssInjectedByJsPlugin({ relativeCSSInjection: true })],
+	publicDir: false,
+	esbuild: {
+		keepNames: true,
+	},
+	resolve: {
+		alias: {
+			'@page-agent/page-controller': resolve(__dirname, '../page-controller/src/PageController.ts'),
+			'@page-agent/llms': resolve(__dirname, '../llms/src/index.ts'),
+			'@page-agent/core': resolve(__dirname, '../core/src/PageAgentCore.ts'),
+			'@page-agent/ui': resolve(__dirname, '../ui/src/index.ts'),
+		},
+	},
+	build: {
+		lib: {
+			entry: resolve(__dirname, 'src/iife.ts'),
+			name: 'PageAgent',
+			fileName: 'page-agent',
+			formats: ['iife'],
+		},
+		outDir: resolve(__dirname, 'dist', 'iife'),
+		cssCodeSplit: true,
+		minify: false,
+		rollupOptions: {
+			output: {
+				// force use .js as extension
+				entryFileNames: 'page-agent.js',
+			},
+			onwarn: function (message, handler) {
+				if (message.code === 'EVAL') return
+				handler(message)
+			},
+		},
+	},
+	define: {
+		'import.meta.env.LLM_MODEL_NAME': JSON.stringify(process.env.LLM_MODEL_NAME),
+		'import.meta.env.LLM_API_KEY': JSON.stringify(process.env.LLM_API_KEY),
+		'import.meta.env.LLM_BASE_URL': JSON.stringify(process.env.LLM_BASE_URL),
+	},
+}))
diff --git a/packages/website/src/pages/Home.tsx b/packages/website/src/pages/Home.tsx
index 9955387..ba2c37a 100644
--- a/packages/website/src/pages/Home.tsx
+++ b/packages/website/src/pages/Home.tsx
@@ -1,5 +1,4 @@
 /* eslint-disable react-dom/no-dangerously-set-innerhtml */
-import { Panel } from '@page-agent/ui'
 import { Bot, Box, MessageSquare, PlayCircle, Shield, Sparkles, Users, Zap } from 'lucide-react'
 import { useEffect, useState } from 'react'
 import { useTranslation } from 'react-i18next'
@@ -95,10 +94,6 @@ export default function HomePage() {
 				// promptForNextTask: false,
 				// enablePanel: false,
 			})
-
-			// Create and bind Panel
-			const panel = new Panel(win.pageAgent, { language: i18n.language as any })
-			panel.show()
 		}
 
 		const result = await win.pageAgent.execute(task)
diff --git a/packages/website/tsconfig.json b/packages/website/tsconfig.json
index 33a054a..9e1dda9 100644
--- a/packages/website/tsconfig.json
+++ b/packages/website/tsconfig.json
@@ -10,11 +10,12 @@
             // Self root
             "@/*": ["src/*"],
 
-            // Simplified monorepo solution (raw npm workspace with hoisting)
-            "page-agent": ["../page-agent/src/PageAgent.ts"],
             "@page-agent/llms": ["../llms/src/index.ts"],
             "@page-agent/page-controller": ["../page-controller/src/PageController.ts"],
-            "@page-agent/ui": ["../ui/src/index.ts"]
+            "@page-agent/core": ["../core/src/PageAgentCore.ts"],
+            "@page-agent/ui": ["../ui/src/index.ts"],
+
+            "page-agent": ["../page-agent/src/PageAgent.ts"]
         }
     },
     "include": ["**/*.ts", "**/*.tsx"],
@@ -22,8 +23,10 @@
     "references": [
         //
         { "path": "../llms" },
-        { "path": "../page-agent" },
         { "path": "../page-controller" },
-        { "path": "../ui" }
+        { "path": "../core" },
+        { "path": "../ui" },
+
+        { "path": "../page-agent" }
     ]
 }
diff --git a/packages/website/vite.config.js b/packages/website/vite.config.js
index fcc24a5..df7e831 100644
--- a/packages/website/vite.config.js
+++ b/packages/website/vite.config.js
@@ -36,9 +36,11 @@ export default defineConfig(({ mode }) => ({
 			'@': resolve(__dirname, 'src'),
 
 			// Monorepo packages (always bundle local code instead of npm versions)
-			'@page-agent/llms': resolve(__dirname, '../llms/src/index.ts'),
 			'@page-agent/page-controller': resolve(__dirname, '../page-controller/src/PageController.ts'),
+			'@page-agent/llms': resolve(__dirname, '../llms/src/index.ts'),
+			'@page-agent/core': resolve(__dirname, '../core/src/PageAgentCore.ts'),
 			'@page-agent/ui': resolve(__dirname, '../ui/src/index.ts'),
+
 			'page-agent': resolve(__dirname, '../page-agent/src/PageAgent.ts'),
 		},
 	},