diff --git a/package.json b/package.json
index fd192b1..4b437ce 100644
--- a/package.json
+++ b/package.json
@@ -28,8 +28,8 @@
         "start": "npm run dev --workspace=@page-agent/website",
         "dev:ext": "npm run dev -w @page-agent/ext",
         "dev:demo": "npm run dev:demo --workspace=page-agent",
-        "build": "npm run build:libs && npm run build:website",
-        "build:libs": "npm run build --workspaces --if-present",
+        "build": "node scripts/build.js",
+        "build:libs": "node scripts/build-libs.js",
         "build:website": "npm run build:website --workspace=@page-agent/website",
         "build:ext": "npm run zip -w @page-agent/ext",
         "version": "node scripts/sync-version.js",
diff --git a/scripts/build-libs.js b/scripts/build-libs.js
new file mode 100644
index 0000000..4ad78fb
--- /dev/null
+++ b/scripts/build-libs.js
@@ -0,0 +1,25 @@
+#!/usr/bin/env node
+/**
+ * Equivalent to: npm run build --workspaces --if-present
+ *
+ * Reads the workspace list from root package.json, filters to those with a
+ * "build" script, and runs them all concurrently via parallelTask.
+ */
+import { readFileSync } from 'fs'
+import { dirname, join } from 'path'
+import { fileURLToPath } from 'url'
+
+import { parallelTask } from './parallel-task.js'
+
+const rootDir = join(dirname(fileURLToPath(import.meta.url)), '..')
+const rootPkg = JSON.parse(readFileSync(join(rootDir, 'package.json'), 'utf-8'))
+
+const tasks = rootPkg.workspaces
+	.map((ws) => {
+		const dir = join(rootDir, ws)
+		const pkg = JSON.parse(readFileSync(join(dir, 'package.json'), 'utf-8'))
+		return pkg.scripts?.build ? { label: pkg.name, command: 'npm run build', cwd: dir } : null
+	})
+	.filter(Boolean)
+
+await parallelTask(tasks, { timeoutMs: 120_000 })
diff --git a/scripts/build.js b/scripts/build.js
new file mode 100644
index 0000000..81e26d3
--- /dev/null
+++ b/scripts/build.js
@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+/**
+ * Full build pipeline. Equivalent to:
+ *   npm run cleanup && npm run build --workspaces --if-present
+ *                    && npm run build:website -w @page-agent/website
+ *                    && npm run zip -w @page-agent/ext
+ *
+ * 1. cleanup
+ * 2. build everything in parallel (libs + website + extension)
+ */
+import chalk from 'chalk'
+import { execSync } from 'child_process'
+import { readFileSync } from 'fs'
+import { dirname, join } from 'path'
+import { fileURLToPath } from 'url'
+
+import { parallelTask } from './parallel-task.js'
+
+const rootDir = join(dirname(fileURLToPath(import.meta.url)), '..')
+const rootPkg = JSON.parse(readFileSync(join(rootDir, 'package.json'), 'utf-8'))
+
+// Step 1: cleanup
+console.log(chalk.bgBlue.white.bold(' ▸ cleanup '))
+execSync('npm run cleanup', { cwd: rootDir, stdio: 'inherit' })
+
+// Step 2: build all in parallel
+console.log(chalk.bgBlue.white.bold(' ▸ build '))
+const tasks = rootPkg.workspaces
+	.map((ws) => {
+		const dir = join(rootDir, ws)
+		const pkg = JSON.parse(readFileSync(join(dir, 'package.json'), 'utf-8'))
+		return pkg.scripts?.build ? { label: pkg.name, command: 'npm run build', cwd: dir } : null
+	})
+	.filter(Boolean)
+
+tasks.push(
+	{
+		label: '@page-agent/website',
+		command: 'npm run build:website',
+		cwd: join(rootDir, 'packages/website'),
+	},
+	{ label: '@page-agent/ext', command: 'npm run zip', cwd: join(rootDir, 'packages/extension') }
+)
+
+await parallelTask(tasks, { timeoutMs: 120_000 })
diff --git a/scripts/parallel-task.js b/scripts/parallel-task.js
new file mode 100644
index 0000000..2cb3248
--- /dev/null
+++ b/scripts/parallel-task.js
@@ -0,0 +1,115 @@
+import chalk from 'chalk'
+import { spawn } from 'child_process'
+
+/**
+ * Run multiple shell commands in parallel with progress reporting.
+ *
+ * @param {{ label: string, command: string, cwd?: string }[]} tasks
+ * @param {{ timeoutMs?: number }} options - Default timeout 30s per task
+ * @returns {Promise<void>} Rejects (process.exit) if any task fails
+ */
+export async function parallelTask(tasks, options = {}) {
+	const { timeoutMs = 30_000 } = options
+	const total = tasks.length
+
+	const bgColors = [
+		chalk.bgCyan,
+		chalk.bgMagenta,
+		chalk.bgBlue,
+		chalk.bgYellow,
+		chalk.bgGreenBright,
+	]
+	const fgOnBg = [chalk.black, chalk.white, chalk.white, chalk.black, chalk.black]
+
+	let done = 0
+	let failed = 0
+
+	const spinner = ['◐', '◓', '◑', '◒']
+	let tick = 0
+
+	const printProgress = () => {
+		const running = total - done - failed
+		const s = spinner[tick++ % spinner.length]
+		const status = failed
+			? `${running} running, ${done} done, ${chalk.bgRed.white.bold(` ${failed} failed `)}`
+			: `${running} running, ${done} done`
+		process.stderr.write(`\r${chalk.bgCyan.black.bold(` ${s} ${done}/${total} `)} ${status}  `)
+	}
+
+	const timer = setInterval(printProgress, 1000)
+	printProgress()
+
+	/** @type {{ label: string, output: string, exitCode: number | null, timedOut: boolean }[]} */
+	const results = await Promise.all(
+		tasks.map(
+			(task) =>
+				new Promise((resolve) => {
+					const chunks = /** @type {Buffer[]} */ ([])
+
+					const child = spawn('sh', ['-c', task.command], {
+						cwd: task.cwd,
+						env: { ...process.env, FORCE_COLOR: '1', NO_COLOR: '' },
+						stdio: ['ignore', 'pipe', 'pipe'],
+					})
+
+					child.stdout.on('data', (d) => chunks.push(d))
+					child.stderr.on('data', (d) => chunks.push(d))
+
+					const timeout = setTimeout(() => {
+						child.kill('SIGTERM')
+					}, timeoutMs)
+
+					child.on('close', (code, signal) => {
+						clearTimeout(timeout)
+						const timedOut = signal === 'SIGTERM'
+						const exitCode = timedOut ? 1 : code
+
+						if (exitCode === 0) done++
+						else failed++
+
+						resolve({
+							label: task.label,
+							output: Buffer.concat(chunks).toString(),
+							exitCode,
+							timedOut,
+						})
+					})
+				})
+		)
+	)
+
+	clearInterval(timer)
+	process.stderr.write('\r\x1b[K')
+
+	const failedTasks = /** @type {typeof results} */ ([])
+
+	for (let i = 0; i < results.length; i++) {
+		const r = results[i]
+		if (r.exitCode !== 0) {
+			failedTasks.push(r)
+			continue
+		}
+		const bg = bgColors[i % bgColors.length]
+		const fg = fgOnBg[i % fgOnBg.length]
+		const banner = bg(fg.bold(` ✔ ${r.label} `))
+		console.log(`\n${banner}`)
+		if (r.output.trim()) process.stdout.write(r.output)
+	}
+
+	if (failedTasks.length) {
+		for (const r of failedTasks) {
+			const banner = chalk.bgRed(
+				chalk.white.bold(` ✘ ${r.label} ${r.timedOut ? '· timed out' : '· failed'} `)
+			)
+			console.log(`\n${banner}`)
+			if (r.output.trim()) process.stdout.write(r.output)
+		}
+		const summary = failedTasks.map((t) => t.label).join(', ')
+		console.error(
+			`\n${chalk.bgRed.white.bold(` ✘ ${failedTasks.length}/${total} failed: ${summary} `)}`
+		)
+		process.exit(1)
+	}
+
+	console.log(`\n${chalk.bgGreen.black.bold(` ✔ All ${total} tasks completed `)}`)
+}