diff --git a/packages/genui/a2ui-playground/README.md b/packages/genui/a2ui-playground/README.md
new file mode 100644
index 0000000000..4f3de65318
--- /dev/null
+++ b/packages/genui/a2ui-playground/README.md
@@ -0,0 +1,65 @@
+# A2UI Playground
+
+Interactive playground for the Lynx **GenUI** toolchain. Chat with an agent to
+generate A2UI / OpenUI surfaces, browse ready-made examples, and preview the
+result on the web or a real device — then rename, delete, or **share** any
+conversation as a durable preview link.
+
+> Private development app; it is not published to npm. For the published library
+> see [`@lynx-js/genui`](../README.md).
+
+## Quick Start
+
+Run everything from the **repo root**.
+
+```bash
+# 1. Install workspace dependencies (first time only)
+pnpm install
+```
+
+The **Create** (chat) tab talks to the GenUI server for agent responses and
+preview publishing. Start it on port `3060` with at least an OpenAI key:
+
+```bash
+# 2. Start the GenUI server → http://localhost:3060
+OPENAI_API_KEY=sk-... pnpm -C packages/genui/server dev
+```
+
+Then start the playground and open the URL it prints (defaults to
+`http://localhost:3000`):
+
+```bash
+# 3. Start the playground
+pnpm -C packages/genui/a2ui-playground dev
+```
+
+On `localhost`, the Create tab automatically targets your local server on
+`:3060`. To use the **hosted** agent without running a server of your own,
+append the endpoint override to the playground URL:
+
+```text
+?a2uiEndpoint=https://genui-server.vercel.app/a2ui/stream
+```
+
+### Server environment
+
+| Variable                                                                     | Purpose                                            | Default             |
+| ---------------------------------------------------------------------------- | -------------------------------------------------- | ------------------- |
+| `OPENAI_API_KEY`                                                             | Agent model access (required for the Create tab)   | —                   |
+| `OPENAI_MODEL`                                                               | Model id                                           | `gpt-4o-mini`       |
+| `OPENAI_BASE_URL`                                                            | Custom OpenAI-compatible endpoint                  | OpenAI              |
+| `SUPABASE_URL`, `SUPABASE_S3_ACCESS_KEY_ID`, `SUPABASE_S3_SECRET_ACCESS_KEY` | Short, shareable preview URLs via Supabase Storage | in-memory dev store |
+| `PEXELS_API_KEY`                                                             | Stock-image search in generated UIs                | —                   |
+
+Conversation **share** links and Web / Native Preview reuse the Supabase Storage
+payload-publishing path — see [`examples/README.md`](./examples/README.md) for
+the bucket setup and local toggles.
+
+## Scripts
+
+| Command        | Description                                              |
+| -------------- | -------------------------------------------------------- |
+| `pnpm dev`     | Build the Lynx preview bundle, then start the dev server |
+| `pnpm build`   | Production build                                         |
+| `pnpm preview` | Serve the production build locally                       |
+| `pnpm test`    | Run the `rstest` suite                                   |
diff --git a/packages/genui/a2ui-playground/src/components/ConversationListPanel.tsx b/packages/genui/a2ui-playground/src/components/ConversationListPanel.tsx
index bbdd46aa33..b84e45ee10 100644
--- a/packages/genui/a2ui-playground/src/components/ConversationListPanel.tsx
+++ b/packages/genui/a2ui-playground/src/components/ConversationListPanel.tsx
@@ -12,6 +12,7 @@ interface ConversationListPanelProps {
   isPersistent: boolean;
   onCreate: () => void;
   onSwitch: (id: string) => void;
+  onShare: (id: string) => void;
   onRename: (id: string, title: string) => void;
   onRemove: (id: string) => void;
 }
@@ -33,6 +34,7 @@ export function ConversationListPanel(props: ConversationListPanelProps) {
     onCreate,
     onRemove,
     onRename,
+    onShare,
     onSwitch,
   } = props;
   const [editingId, setEditingId] = useState<string | null>(null);
@@ -137,6 +139,15 @@ export function ConversationListPanel(props: ConversationListPanelProps) {
                   </button>
                 )}
               <div className='conversationListItemActions'>
+                <button
+                  type='button'
+                  className='conversationIconButton'
+                  disabled={disabled || editing}
+                  title='Copy share link'
+                  onClick={() => onShare(conversation.id)}
+                >
+                  Share
+                </button>
                 <button
                   type='button'
                   className='conversationIconButton'
diff --git a/packages/genui/a2ui-playground/src/pages/AIChatPage.tsx b/packages/genui/a2ui-playground/src/pages/AIChatPage.tsx
index 9b8a64463f..7e200f8309 100644
--- a/packages/genui/a2ui-playground/src/pages/AIChatPage.tsx
+++ b/packages/genui/a2ui-playground/src/pages/AIChatPage.tsx
@@ -19,9 +19,11 @@ import type { StaticDemo } from '../demos.js';
 import { useConversation } from '../hooks/useConversation.js';
 import type { ModelChatMessage } from '../hooks/useConversation.js';
 import { useResizablePanels } from '../hooks/useResizablePanels.js';
+import { loadConversation } from '../storage/conversationRepo.js';
 import { copyToClipboard } from '../utils/clipboard.js';
 import { DEFAULT_A2UI_DEMO_URL } from '../utils/demoUrl.js';
 import type { Protocol } from '../utils/protocol.js';
+import { publishA2UIPayload } from '../utils/publishPayload.js';
 import { buildRenderUrl } from '../utils/renderUrl.js';
 
 interface ChatMessage {
@@ -1786,6 +1788,74 @@ export function AIChatPage(
     void switchTo(id);
   }, [isGenerating, switchTo]);
 
+  const handleShareConversation = useCallback(
+    async (id: string) => {
+      try {
+        let urls: PreviewPayloadUrls | null = null;
+        let fallbackMessages: unknown[] | null = null;
+
+        // Active conversation: the freshest URLs/messages live in refs.
+        if (id === activeId) {
+          urls = latestPreviewPayloadUrlsRef.current;
+          fallbackMessages = latestPreviewMessagesRef.current;
+        }
+
+        // Otherwise (or if the active one hasn't published yet) read the
+        // durable Supabase URLs persisted on the conversation snapshot.
+        if (!urls?.messagesUrl) {
+          const record = await loadConversation(id);
+          const snapshot = record?.snapshot;
+          const fromSnapshot = snapshot?.previewPayloadUrls;
+          const fromMessage = record
+            ? [...record.messages]
+              .reverse()
+              .find((message) => message.previewPayloadUrls?.messagesUrl)
+              ?.previewPayloadUrls
+            : undefined;
+          urls = (fromSnapshot?.messagesUrl ? fromSnapshot : fromMessage)
+            ?? urls;
+          if (
+            !urls?.messagesUrl
+            && (!fallbackMessages || fallbackMessages.length === 0)
+          ) {
+            const previewMessages = snapshot?.previewMessages;
+            if (Array.isArray(previewMessages) && previewMessages.length > 0) {
+              fallbackMessages = previewMessages;
+            }
+          }
+        }
+
+        // No durable URL yet: publish the raw A2UI messages to Supabase.
+        if (
+          !urls?.messagesUrl && fallbackMessages && fallbackMessages.length > 0
+        ) {
+          urls = await publishA2UIPayload(fallbackMessages);
+        }
+
+        if (!urls?.messagesUrl) {
+          showCopyToast(false);
+          return;
+        }
+
+        const link = buildRenderUrl(
+          {
+            protocol,
+            demoUrl: DEFAULT_A2UI_DEMO_URL,
+            messages: [],
+            messagesUrl: urls.messagesUrl,
+            actionMocksUrl: urls.actionMocksUrl,
+            theme,
+          },
+          baseUrl,
+        );
+        showCopyToast(await copyToClipboard(link));
+      } catch {
+        showCopyToast(false);
+      }
+    },
+    [activeId, baseUrl, protocol, showCopyToast, theme],
+  );
+
   const handleRenameConversation = useCallback((id: string, title: string) => {
     void rename(id, title);
   }, [rename]);
@@ -1838,6 +1908,7 @@ export function AIChatPage(
           isPersistent={isPersistent}
           onCreate={handleCreateConversation}
           onSwitch={handleSwitchConversation}
+          onShare={handleShareConversation}
           onRename={handleRenameConversation}
           onRemove={handleRemoveConversation}
         />
diff --git a/packages/genui/a2ui-playground/src/pages/DemosPage.tsx b/packages/genui/a2ui-playground/src/pages/DemosPage.tsx
index 829bbc22cf..46d0c31965 100644
--- a/packages/genui/a2ui-playground/src/pages/DemosPage.tsx
+++ b/packages/genui/a2ui-playground/src/pages/DemosPage.tsx
@@ -17,6 +17,7 @@ import { DYNAMIC_PRESETS, STATIC_DEMOS } from '../demos.js';
 import { useResizablePanels } from '../hooks/useResizablePanels.js';
 import { DEFAULT_A2UI_DEMO_URL } from '../utils/demoUrl.js';
 import type { Protocol } from '../utils/protocol.js';
+import { publishA2UIPayload } from '../utils/publishPayload.js';
 
 interface Scenario {
   id: string;
@@ -34,17 +35,10 @@ interface PreviewInput {
   demoId?: string;
 }
 
-interface PublishedPayload {
-  messagesUrl: string;
-  actionMocksUrl?: string;
-}
-
 type PlayState = 'idle' | 'playing' | 'paused' | 'done';
 type PlaybackProgressStatus = 'idle' | 'streaming' | 'paused' | 'done';
 
 const jsonExtensions = [json()];
-const ONLINE_A2UI_SERVER_ORIGIN = 'https://genui-server.vercel.app';
-const LOCAL_A2UI_SERVER_PORT = '3060';
 
 declare const __A2UI_PLAYGROUND_CLIENT_PAYLOAD_STORE__: boolean;
 
@@ -61,57 +55,6 @@ function findScenarioById(id?: string): Scenario | undefined {
   return ALL_SCENARIOS.find((s) => s.id === id);
 }
 
-function isDevHost(hostname: string): boolean {
-  return (
-    hostname === 'localhost'
-    || hostname === '127.0.0.1'
-    || hostname === '0.0.0.0'
-    || hostname.startsWith('10.')
-    || hostname.startsWith('192.168.')
-    || /^172\.(?:1[6-9]|2\d|3[01])\./u.test(hostname)
-  );
-}
-
-function getA2UIPayloadEndpoint(): string {
-  if (
-    window.location.protocol === 'http:' && isDevHost(window.location.hostname)
-  ) {
-    return `http://${window.location.hostname}:${LOCAL_A2UI_SERVER_PORT}/a2ui/payload`;
-  }
-  return `${ONLINE_A2UI_SERVER_ORIGIN}/a2ui/payload`;
-}
-
-async function publishA2UIPayloadForPreview(
-  messages: unknown,
-  actionMocks?: Record<string, unknown>,
-): Promise<PublishedPayload> {
-  const res = await window.fetch(getA2UIPayloadEndpoint(), {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ messages, actionMocks }),
-  });
-  const payload = await res.json().catch(() => ({})) as {
-    preview?: {
-      messagesUrl?: unknown;
-      actionMocksUrl?: unknown;
-    };
-    error?: unknown;
-  };
-  if (!res.ok || typeof payload.preview?.messagesUrl !== 'string') {
-    throw new Error(
-      typeof payload.error === 'string'
-        ? payload.error
-        : 'Failed to publish A2UI messages',
-    );
-  }
-  return {
-    messagesUrl: payload.preview.messagesUrl,
-    actionMocksUrl: typeof payload.preview.actionMocksUrl === 'string'
-      ? payload.preview.actionMocksUrl
-      : undefined,
-  };
-}
-
 const ALL_SCENARIOS: Scenario[] = [
   ...STATIC_DEMOS.map((d) => ({ ...d, actionMocks: undefined })),
   ...DYNAMIC_PRESETS,
@@ -342,7 +285,7 @@ export function DemosPage(props: {
     if (committed) {
       if (!committed.isKnownDemo && !__A2UI_PLAYGROUND_CLIENT_PAYLOAD_STORE__) {
         setIsPublishingPayload(true);
-        void publishA2UIPayloadForPreview(
+        void publishA2UIPayload(
           committed.parsed,
           currentScenario?.actionMocks,
         ).then((preview) => {
diff --git a/packages/genui/a2ui-playground/src/utils/publishPayload.ts b/packages/genui/a2ui-playground/src/utils/publishPayload.ts
new file mode 100644
index 0000000000..1e1ccab7b2
--- /dev/null
+++ b/packages/genui/a2ui-playground/src/utils/publishPayload.ts
@@ -0,0 +1,67 @@
+// Copyright 2026 The Lynx Authors. All rights reserved.
+// Licensed under the Apache License Version 2.0 that can be found in the
+// LICENSE file in the root directory of this source tree.
+
+const ONLINE_A2UI_SERVER_ORIGIN = 'https://genui-server.vercel.app';
+const LOCAL_A2UI_SERVER_PORT = '3060';
+
+export interface PublishedPayload {
+  messagesUrl: string;
+  actionMocksUrl?: string;
+}
+
+function isDevHost(hostname: string): boolean {
+  return (
+    hostname === 'localhost'
+    || hostname === '127.0.0.1'
+    || hostname === '0.0.0.0'
+    || hostname.startsWith('10.')
+    || hostname.startsWith('192.168.')
+    || /^172\.(?:1[6-9]|2\d|3[01])\./u.test(hostname)
+  );
+}
+
+export function getA2UIPayloadEndpoint(): string {
+  if (
+    window.location.protocol === 'http:' && isDevHost(window.location.hostname)
+  ) {
+    return `http://${window.location.hostname}:${LOCAL_A2UI_SERVER_PORT}/a2ui/payload`;
+  }
+  return `${ONLINE_A2UI_SERVER_ORIGIN}/a2ui/payload`;
+}
+
+/**
+ * Upload an A2UI payload to the GenUI server (Supabase Storage) and return the
+ * durable public URLs. The returned `messagesUrl` can be fed to
+ * `buildRenderUrl()` to produce a shareable `render.html` link.
+ */
+export async function publishA2UIPayload(
+  messages: unknown,
+  actionMocks?: Record<string, unknown>,
+): Promise<PublishedPayload> {
+  const res = await window.fetch(getA2UIPayloadEndpoint(), {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ messages, actionMocks }),
+  });
+  const payload = await res.json().catch(() => ({})) as {
+    preview?: {
+      messagesUrl?: unknown;
+      actionMocksUrl?: unknown;
+    };
+    error?: unknown;
+  };
+  if (!res.ok || typeof payload.preview?.messagesUrl !== 'string') {
+    throw new Error(
+      typeof payload.error === 'string'
+        ? payload.error
+        : 'Failed to publish A2UI messages',
+    );
+  }
+  return {
+    messagesUrl: payload.preview.messagesUrl,
+    actionMocksUrl: typeof payload.preview.actionMocksUrl === 'string'
+      ? payload.preview.actionMocksUrl
+      : undefined,
+  };
+}