diff --git a/components/chat/message-attachments.tsx b/components/chat/message-attachments.tsx
index c61be257..0ae6a2ce 100644
--- a/components/chat/message-attachments.tsx
+++ b/components/chat/message-attachments.tsx
@@ -18,6 +18,7 @@ import { LinkPreviewCard } from "@/components/chat/link-preview-card";
 import { MediaGrid } from "@/components/chat/media-grid";
 import { MediaLightbox } from "@/components/chat/media-lightbox";
 import { QuoteCard } from "@/components/chat/quote-card";
+import { SharedPostCard } from "@/components/chat/shared-post-card";
 import { attachmentUrl, type Attachment } from "@/lib/chat";
 
 function humanSize(bytes?: number | null): string {
@@ -58,6 +59,9 @@ export function MessageAttachments({
 
         {rest.map((a) => {
           switch (a.kind) {
+            case "entity":
+              return <SharedPostCard key={a.id} attachment={a} />;
+
             case "quote":
               return <QuoteCard key={a.id} attachment={a} />;
 
diff --git a/components/chat/share-to-chat-dialog.tsx b/components/chat/share-to-chat-dialog.tsx
index b3485113..22c2e2e1 100644
--- a/components/chat/share-to-chat-dialog.tsx
+++ b/components/chat/share-to-chat-dialog.tsx
@@ -37,12 +37,16 @@ type SendState = "idle" | "sending" | "sent";
 export function ShareToChatDialog({
   body = "",
   quote,
+  entity,
   onClose,
 }: {
   /** Plain message text. Empty when sending a quote on its own. */
   body?: string;
   /** A passage from the library, sent as a tappable quotation. */
   quote?: QuotePayload;
+  /** A post, sent as a card. Only the reference travels — the BFF resolves
+   *  the contents and re-checks visibility for each viewer. */
+  entity?: { type: "post"; id: string };
   onClose: () => void;
 }) {
   const { user } = useAuth();
@@ -111,7 +115,7 @@ export function ShareToChatDialog({
     mark(handle, "sending");
     try {
       const id = conversationId ?? (await chat.openDM(handle)).id;
-      await chat.send(id, body, { quote });
+      await chat.send(id, body, { quote, entity });
       mark(handle, "sent");
     } catch {
       mark(handle, "idle");
diff --git a/components/chat/shared-post-card.tsx b/components/chat/shared-post-card.tsx
new file mode 100644
index 00000000..deee33b2
--- /dev/null
+++ b/components/chat/shared-post-card.tsx
@@ -0,0 +1,75 @@
+"use client";
+
+/**
+ * A post shared into a chat, rendered as a card with its author.
+ *
+ * The contents are resolved by the BFF on every read, per viewer — never from
+ * a snapshot frozen at send time. So a post that has since been deleted or
+ * hidden arrives as `entity_unavailable` and renders as a tombstone rather
+ * than quietly showing content the reader is no longer allowed to see.
+ */
+
+import Link from "next/link";
+import { ImageOff } from "lucide-react";
+import { UserAvatar } from "@/components/ui/user-avatar";
+import type { Attachment } from "@/lib/chat";
+
+export function SharedPostCard({ attachment }: { attachment: Attachment }) {
+  const post = attachment.entity;
+
+  if (!post || attachment.entity_unavailable) {
+    return (
+      <div className="mt-1 flex items-center gap-2 rounded-lg border border-border bg-muted/30 px-3 py-2.5">
+        <ImageOff className="size-4 shrink-0 text-muted-foreground" aria-hidden />
+        <span className="text-sm text-muted-foreground">
+          This post is no longer available
+        </span>
+      </div>
+    );
+  }
+
+  return (
+    <Link
+      href={`/u/${encodeURIComponent(post.author_handle)}/posts#post-${post.id}`}
+      className="mt-1 block overflow-hidden rounded-lg border border-border bg-card transition-colors hover:bg-muted/40"
+    >
+      <span className="flex items-center gap-2 px-3 py-2">
+        <UserAvatar
+          src={post.author_avatar_url ?? null}
+          name={post.author_name}
+          className="size-6 shrink-0"
+        />
+        <span className="min-w-0 flex-1">
+          <span className="block truncate text-xs font-medium text-foreground">
+            {post.author_name}
+          </span>
+          <span className="block truncate text-[11px] text-muted-foreground">
+            @{post.author_handle}
+          </span>
+        </span>
+      </span>
+
+      {post.image_url && (
+        // eslint-disable-next-line @next/next/no-img-element
+        <img
+          src={post.image_url}
+          alt=""
+          loading="lazy"
+          className="aspect-square w-full object-cover"
+        />
+      )}
+
+      {post.caption && (
+        <span className="block px-3 py-2 text-sm leading-relaxed text-foreground line-clamp-3">
+          {post.caption}
+        </span>
+      )}
+
+      {post.source_title && (
+        <span className="block truncate px-3 pb-2 text-xs text-muted-foreground">
+          {post.source_title}
+        </span>
+      )}
+    </Link>
+  );
+}
diff --git a/components/social/post/post-actions-footer.tsx b/components/social/post/post-actions-footer.tsx
index 96695d0d..c47ca439 100644
--- a/components/social/post/post-actions-footer.tsx
+++ b/components/social/post/post-actions-footer.tsx
@@ -39,7 +39,6 @@ import {
   type Comment,
   type Post,
 } from "@/lib/social";
-import { buildPostShareText } from "@/lib/post-share-text";
 import { useLongPress } from "@/lib/use-long-press";
 import { ShareToChatDialog } from "@/components/chat/share-to-chat-dialog";
 import { useAuth } from "@/components/auth/auth-provider";
@@ -65,8 +64,9 @@ export function PostActionsFooter({ post }: { post: Post }) {
   // on mobile native-share; sheet mount on desktop) so the Send icon
   // can render a spinner while the user waits.
   const [sharePending, setSharePending] = useState(false);
-  // The post as chat-ready text. Non-null opens the picker.
-  const [chatBody, setChatBody] = useState<string | null>(null);
+  // Opens the chat picker for this post. The post travels as a reference,
+  // not as text — the BFF renders the card and re-checks who may see it.
+  const [sharingToChat, setSharingToChat] = useState(false);
   // Optimistic local mirror of post.viewer_has_reshared so the swap
   // happens the instant the user taps Reshare. Reconciles to the
   // server's value via rollback if the API call fails.
@@ -148,21 +148,10 @@ export function PostActionsFooter({ post }: { post: Post }) {
   // Tap → send to a chat. Hold → the platform's own share sheet, for
   // everything outside the app. The link text is identical either way; only
   // the destination differs.
-  async function onSendClick() {
-    if (sharePending) return;
-    setSharePending(true);
-    try {
-      const share = await buildPostShareText(post, post.author_handle ?? "");
-      if (!share) {
-        // No handle means no post URL — fall back to the sheet, which
-        // resolves the handle itself and has its own failure path.
-        await openShareSheet(post);
-        return;
-      }
-      setChatBody(share.text);
-    } finally {
-      setSharePending(false);
-    }
+  function onSendClick() {
+    // No URL to resolve: sharing in-app sends the post id, so this is
+    // instant where the native sheet has to await the shortener.
+    setSharingToChat(true);
   }
 
   async function onSendHold() {
@@ -302,8 +291,11 @@ export function PostActionsFooter({ post }: { post: Post }) {
           no per-card instance lives here. The provider's
           openShareSheet swaps the active post under the hood. */}
 
-      {chatBody !== null && (
-        <ShareToChatDialog body={chatBody} onClose={() => setChatBody(null)} />
+      {sharingToChat && (
+        <ShareToChatDialog
+          entity={{ type: "post", id: post.id }}
+          onClose={() => setSharingToChat(false)}
+        />
       )}
     </>
   );
diff --git a/lib/chat.ts b/lib/chat.ts
index 4d5f13b5..5905ff67 100644
--- a/lib/chat.ts
+++ b/lib/chat.ts
@@ -188,6 +188,25 @@ export type Attachment = {
   description?: string | null;
   site_name?: string | null;
   image_url?: string | null;
+
+  /** Shared entity. `entity` is resolved per viewer on every read, so it can
+   *  be absent even though the message still references a post. */
+  entity_type?: "post" | null;
+  entity_id?: string | null;
+  entity?: SharedPost | null;
+  /** The post was deleted, hidden, or is no longer visible to this viewer. */
+  entity_unavailable?: boolean;
+};
+
+/** The post card the BFF resolves for a shared-post attachment. */
+export type SharedPost = {
+  id: string;
+  author_handle: string;
+  author_name: string;
+  author_avatar_url?: string | null;
+  caption: string;
+  image_url?: string | null;
+  source_title?: string;
 };
 
 /** How two people in a DM stand with each other. */
@@ -261,6 +280,8 @@ export const chat = {
       previewUrl?: string;
       attachments?: UploadedAttachment[];
       quote?: QuotePayload;
+      /** Share a post as a card. Only the reference — the BFF resolves it. */
+      entity?: { type: "post"; id: string };
     },
   ) =>
     call<ChatMessage>(`/chat/conversations/${conversationId}/messages`, {
@@ -273,6 +294,7 @@ export const chat = {
         preview_url: opts?.previewUrl ?? null,
         attachments: opts?.attachments ?? [],
         quote: opts?.quote ?? null,
+        entity: opts?.entity ?? null,
       }),
     }),