diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
new file mode 100644
index 00000000..3607d66d
--- /dev/null
+++ b/.github/workflows/e2e.yml
@@ -0,0 +1,47 @@
+name: E2E
+
+on:
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: e2e-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  playwright:
+    name: Playwright E2E
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Setup Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install Playwright Chromium
+        run: npx playwright install --with-deps chromium
+
+      - name: Run Playwright tests
+        run: npm run test:e2e -- --project=chromium --reporter=html
+
+      - name: Upload Playwright report
+        uses: actions/upload-artifact@v6
+        if: always()
+        with:
+          name: playwright-report
+          path: playwright-report/
+          retention-days: 14
diff --git a/components/sidebar-panel.tsx b/components/sidebar-panel.tsx
index dc9180bd..0a395084 100644
--- a/components/sidebar-panel.tsx
+++ b/components/sidebar-panel.tsx
@@ -790,7 +790,10 @@ export function SidebarPanel({
           {SIDEBAR_TABS.map(tab => (
             <button
               key={tab.id}
+              type="button"
               onClick={() => setActiveTab(tab.id)}
+              aria-pressed={activeTab === tab.id}
+              aria-label={`${tab.label} tab`}
               style={{
                 flex: 1,
                 minHeight: variant === "mobile" ? 46 : undefined,
diff --git a/e2e/admin-passport.spec.ts b/e2e/admin-passport.spec.ts
new file mode 100644
index 00000000..d1e35a3e
--- /dev/null
+++ b/e2e/admin-passport.spec.ts
@@ -0,0 +1,25 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('admin passport flow', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/admin');
+  });
+
+  test('opens the passport tab with mint, verification, payment, and replay controls', async ({ page }) => {
+    await page.getByRole('button', { name: /Agent Passport/i }).click();
+
+    await expect(page.getByText('Zero-knowledge trust layer')).toBeVisible();
+    await expect(page.getByText('Mint passport')).toBeVisible();
+    await expect(page.getByRole('button', { name: /Generate proof/i })).toBeVisible();
+
+    await expect(page.getByText('Simulate on-chain verification')).toBeVisible();
+    await expect(page.getByRole('button', { name: /Simulate verification/i })).toBeDisabled();
+
+    await expect(page.getByText('Authorize x402 payment')).toBeVisible();
+    await expect(page.getByRole('button', { name: /Request payment/i })).toBeDisabled();
+
+    await expect(page.getByText('Replay attack')).toBeVisible();
+    await expect(page.getByRole('button', { name: /Replay spent proof/i })).toBeVisible();
+    await expect(page.getByText('Passport collection')).toBeVisible();
+  });
+});
diff --git a/e2e/agent-wallet.spec.ts b/e2e/agent-wallet.spec.ts
new file mode 100644
index 00000000..316e8c46
--- /dev/null
+++ b/e2e/agent-wallet.spec.ts
@@ -0,0 +1,26 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('agent selection and wallet surface', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.addInitScript(() => {
+      window.localStorage.setItem('onboarding-seen', '1');
+    });
+    await page.goto('/');
+  });
+
+  test('selects an agent from the canvas and keeps the wallet workflow reachable', async ({ page }) => {
+    const cityCanvas = page.getByRole('listbox', { name: 'Agents on city canvas' });
+    const nexusAgent = cityCanvas.getByRole('option', { name: /Nexus-7/i });
+
+    await nexusAgent.click();
+    await expect(nexusAgent).toHaveAttribute('aria-selected', 'true');
+
+    const walletTab = page.getByRole('button', { name: 'Wallet tab', exact: true });
+    await walletTab.click();
+    await expect(walletTab).toHaveAttribute('aria-pressed', 'true');
+
+    await expect(
+      page.getByText(/Checking Freighter wallet|Freighter Not Detected|Freighter detected|Connect Freighter Wallet|Get Freighter/i).first(),
+    ).toBeVisible();
+  });
+});
diff --git a/e2e/onboarding-modal.spec.ts b/e2e/onboarding-modal.spec.ts
new file mode 100644
index 00000000..53587386
--- /dev/null
+++ b/e2e/onboarding-modal.spec.ts
@@ -0,0 +1,60 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('onboarding modal', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.addInitScript(() => {
+      window.localStorage.clear();
+    });
+  });
+
+  test('shows the first-visit tour with the expected first step', async ({ page }) => {
+    await page.goto('/');
+
+    await expect(page.getByText('Step 1 of 3')).toBeVisible();
+    await expect(page.getByText('Agent City')).toBeVisible();
+    await expect(page.getByText('The canvas shows your AI agents roaming a pixel city.')).toBeVisible();
+    await expect(page.getByRole('button', { name: 'Next', exact: true })).toBeVisible();
+  });
+
+  test('steps through all onboarding panels', async ({ page }) => {
+    await page.goto('/');
+
+    await expect(page.locator('text=Agent City')).toBeVisible();
+
+    const nextButton = page.getByRole('button', { name: 'Next', exact: true });
+    await nextButton.click();
+
+    await expect(page.locator('text=Sidebar Controls')).toBeVisible();
+    await expect(page.getByText('The sidebar has four tabs')).toBeVisible();
+    await nextButton.click();
+
+    await expect(page.locator('text=Admin Console')).toBeVisible();
+    await expect(page.getByText('Visit /admin to manage ZK passports')).toBeVisible();
+    await expect(page.getByRole('button', { name: /get started/i })).toBeVisible();
+  });
+
+  test('persists completion after Get started', async ({ page }) => {
+    await page.goto('/');
+
+    const nextButton = page.getByRole('button', { name: 'Next', exact: true });
+    await nextButton.click();
+    await nextButton.click();
+
+    await page.getByRole('button', { name: /get started/i }).click();
+
+    await expect(page.locator('text=Agent City')).not.toBeVisible();
+    await expect(page.evaluate(() => localStorage.getItem('onboarding-seen'))).resolves.toBe('1');
+
+    await page.reload();
+    await expect(page.getByText('Step 1 of 3')).not.toBeVisible();
+  });
+
+  test('allows skipping the tour', async ({ page }) => {
+    await page.goto('/');
+
+    await page.getByRole('button', { name: /skip/i }).click();
+
+    await expect(page.getByText('Step 1 of 3')).not.toBeVisible();
+    await expect(page.evaluate(() => localStorage.getItem('onboarding-seen'))).resolves.toBe('1');
+  });
+});
diff --git a/e2e/sidebar-tabs.spec.ts b/e2e/sidebar-tabs.spec.ts
new file mode 100644
index 00000000..fc6402b8
--- /dev/null
+++ b/e2e/sidebar-tabs.spec.ts
@@ -0,0 +1,61 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('sidebar tab persistence', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.addInitScript(() => {
+      window.localStorage.setItem('onboarding-seen', '1');
+    });
+    await page.goto('/');
+  });
+
+  const tabButton = (page: Parameters<Parameters<typeof test>[2]>[0]['page'], tab: string) =>
+    page.getByRole('button', { name: `${tab} tab`, exact: true });
+
+  test('shows all desktop sidebar tabs', async ({ page }) => {
+    const tabs = ['Overview', 'Chat', 'Offers', 'Skills', 'Quests', 'Wallet', 'Appearance'];
+
+    for (const tab of tabs) {
+      await expect(tabButton(page, tab)).toBeVisible();
+    }
+  });
+
+  test('defaults to the Overview tab', async ({ page }) => {
+    const overviewTab = tabButton(page, 'Overview');
+
+    await expect(overviewTab).toHaveAttribute('aria-pressed', 'true');
+    await expect(page.getByText('City Overview')).toBeVisible();
+  });
+
+  test('switches tabs and updates active state', async ({ page }) => {
+    await tabButton(page, 'Chat').click();
+    await expect(tabButton(page, 'Chat')).toHaveAttribute('aria-pressed', 'true');
+
+    await tabButton(page, 'Skills').click();
+    await expect(tabButton(page, 'Skills')).toHaveAttribute('aria-pressed', 'true');
+    await expect(page.evaluate(() => localStorage.getItem('sidebar-tab'))).resolves.toBe('skills');
+  });
+
+  test('persists the selected tab after reload', async ({ page }) => {
+    await tabButton(page, 'Wallet').click();
+    await expect(tabButton(page, 'Wallet')).toHaveAttribute('aria-pressed', 'true');
+
+    await page.reload();
+
+    await expect(tabButton(page, 'Wallet')).toHaveAttribute('aria-pressed', 'true');
+  });
+
+  test('stores each tab selection in localStorage', async ({ page }) => {
+    const tabs = [
+      ['Chat', 'chat'],
+      ['Offers', 'offers'],
+      ['Skills', 'skills'],
+      ['Quests', 'quests'],
+      ['Wallet', 'wallet'],
+    ] as const;
+
+    for (const [label, storedValue] of tabs) {
+      await tabButton(page, label).click();
+      await expect(page.evaluate(() => localStorage.getItem('sidebar-tab'))).resolves.toBe(storedValue);
+    }
+  });
+});
diff --git a/package-lock.json b/package-lock.json
index 2486a7cb..fa455506 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -79,6 +79,7 @@
         "zod": "^3.24.1"
       },
       "devDependencies": {
+        "@playwright/test": "^1.61.1",
         "@secretlint/secretlint-rule-preset-recommend": "^12.0.0",
         "@size-limit/file": "^12.1.0",
         "@tailwindcss/postcss": "^4.2.0",
@@ -2153,6 +2154,22 @@
         "lit": "^3"
       }
     },
+    "node_modules/@playwright/test": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.61.1.tgz",
+      "integrity": "sha512-8nKv6+0RJSL9FE4jYOEGXnPeM/Hg12qZpmqzZjRh3qM0Y7c3z1mrOTfFLids72RDQYVh9WpLEfR5WdpNX4fkig==",
+      "devOptional": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.61.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@radix-ui/number": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@radix-ui/number/-/number-1.1.2.tgz",
@@ -13407,6 +13424,52 @@
       "version": "7.1.0",
       "license": "MIT"
     },
+    "node_modules/playwright": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.61.1.tgz",
+      "integrity": "sha512-DWnY5o3YbLWK4GovuAVwpqL+1VwGNdUGrRr++8j8PtQQzvAVZUIMjKQ90fY689sEJZJBbZVw1rXaOKSTitkzPQ==",
+      "devOptional": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.61.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.61.1.tgz",
+      "integrity": "sha512-h7Qlt6m4REp25qvIdvbDtVmD4LqVXfpRxhORv9L0jzETM05p4fuPJ3dKyuSXQxDSbXnmS79HAgi9589lGSpLkg==",
+      "devOptional": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/playwright/node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
     "node_modules/pluralize": {
       "version": "8.0.0",
       "dev": true,
diff --git a/package.json b/package.json
index 7cc13724..e3cb733e 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,9 @@
     "secretlint": "secretlint \"**/*\"",
     "size-limit": "size-limit",
     "test": "vitest run",
+    "test:e2e": "playwright test",
+    "test:e2e:headed": "playwright test --headed",
+    "test:e2e:ui": "playwright test --ui",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
     "deploy:evm:guide": "node scripts/deploy/evm/guide.mjs",
@@ -89,6 +92,7 @@
     "zod": "^3.24.1"
   },
   "devDependencies": {
+    "@playwright/test": "^1.61.1",
     "@secretlint/secretlint-rule-preset-recommend": "^12.0.0",
     "@size-limit/file": "^12.1.0",
     "@tailwindcss/postcss": "^4.2.0",
diff --git a/playwright.config.ts b/playwright.config.ts
new file mode 100644
index 00000000..985c9228
--- /dev/null
+++ b/playwright.config.ts
@@ -0,0 +1,34 @@
+import { defineConfig, devices } from '@playwright/test';
+
+/**
+ * Playwright E2E configuration for Open-Stellar
+ * Tests critical user flows with mocked wallet/payment interactions
+ */
+export default defineConfig({
+  testDir: './e2e',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: process.env.CI ? 'html' : 'list',
+
+  use: {
+    baseURL: process.env.BASE_URL || 'http://localhost:3000',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+
+  webServer: {
+    command: 'npm run dev',
+    url: 'http://localhost:3000',
+    reuseExistingServer: !process.env.CI,
+    timeout: 120000,
+  },
+});
diff --git a/vitest.config.ts b/vitest.config.ts
index d287fc87..c1e10b1e 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
     globals: true,
     // The create-app template is a scaffold compiled inside generated apps, not here;
     // its imports (@/lib/agents/my-first-agent, ...) don't resolve in this repo.
-    exclude: ["**/node_modules/**", "**/dist/**", "packages/create-app/template/**"],
+    exclude: ["**/node_modules/**", "**/dist/**", "packages/create-app/template/**", "e2e/**"],
     coverage: {
       provider: "v8",
       reporter: ["text", "lcov"],