diff --git a/tests/e2e/reddit-broker.spec.ts b/tests/e2e/reddit-broker.spec.ts
new file mode 100644
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+++ b/tests/e2e/reddit-broker.spec.ts
@@ -0,0 +1,65 @@
+import { test, expect } from '@playwright/test';
+
+// Reddit OAuth broker integration E2E (docs/platform/REDDIT-OAUTH-BROKER.md
+// on DOS-Me). The e2e workspace has no channel entitlement (Crove is
+// billing-gated by design), so the full connect flow needs a paid org plus a
+// real Reddit authorization - run that part as a manual click-through. This
+// spec covers what needs no entitlement:
+//  1. The dos.me broker accepts the beta product label + a 128-bit product
+//     state and hands off to Reddit's authorize page with the DOS app
+//     credentials and its own callback redirect_uri (real broker contract).
+//  2. The frontend callback page survives the broker's denial shape
+//     (?error=...&state=...) end to end and renders the error screen.
+
+test.describe('reddit broker contract', () => {
+  test('broker authorize hands off to Reddit with the DOS app', async ({
+    request,
+  }) => {
+    // 32 alphanumeric chars = ~190 bits, above the broker's 128-bit floor.
+    const state = 'A'.repeat(16) + 'a'.repeat(16);
+    const resp = await request.get(
+      `https://api.dos.me/oauth/reddit/authorize?product=crove-post-beta&state=${state}`,
+      { maxRedirects: 0 }
+    );
+    expect(resp.status()).toBe(302);
+    const location = resp.headers()['location']!;
+    expect(location).toContain('https://www.reddit.com/api/v1/authorize');
+    const params = new URL(location).searchParams;
+    expect(params.get('client_id')?.length).toBeGreaterThan(5);
+    expect(params.get('response_type')).toBe('code');
+    expect(params.get('redirect_uri')).toBe(
+      'https://api.dos.me/oauth/reddit/callback'
+    );
+    expect(params.get('duration')).toBe('permanent');
+    expect(params.get('scope')?.split(' ').sort()).toEqual([
+      'flair',
+      'identity',
+      'read',
+      'submit',
+    ]);
+    expect(params.get('state')).not.toBe(state);
+
+    // An unknown product must be rejected, not redirected anywhere.
+    const bad = await request.get(
+      `https://api.dos.me/oauth/reddit/authorize?product=not-a-product&state=${state}`,
+      { maxRedirects: 0 }
+    );
+    expect(bad.status()).toBe(400);
+
+    // A short state (the old 6-char makeId) must be rejected.
+    const short = await request.get(
+      `https://api.dos.me/oauth/reddit/authorize?product=crove-post-beta&state=Ab3xY9`,
+      { maxRedirects: 0 }
+    );
+    expect(short.status()).toBe(400);
+  });
+
+  test('denial callback renders the error screen', async ({ page }) => {
+    await page.goto(
+      '/integrations/social/reddit?state=brokerDenialProbe0001&error=access_denied'
+    );
+    await expect(
+      page.getByText('Could not add provider').first()
+    ).toBeVisible({ timeout: 30_000 });
+  });
+});