diff --git a/src/components/Post/Embed/ExternalEmbed/PublicationEmbed/types.ts b/src/components/Post/Embed/ExternalEmbed/PublicationEmbed/types.ts
new file mode 100644
index 0000000000..e22c7a6667
--- /dev/null
+++ b/src/components/Post/Embed/ExternalEmbed/PublicationEmbed/types.ts
@@ -0,0 +1,42 @@
+import {
+  type AppBskyEmbedExternal,
+  type ComAtprotoRepoStrongRef,
+} from '@atproto/api'
+
+/**
+ * Local extension of `app.bsky.embed.external#viewExternal` that mirrors
+ * atproto PR #4915. Once @atproto/api ships those fields, delete this file
+ * and replace usages with `AppBskyEmbedExternal.ViewExternal` directly.
+ */
+export type PublicationViewExternal = AppBskyEmbedExternal.ViewExternal & {
+  createdAt?: string
+  updatedAt?: string
+  readingTime?: number
+  source?: PublicationViewExternalSource
+  associatedRecord?: ComAtprotoRepoStrongRef.Main
+  associatedBskyPost?: ComAtprotoRepoStrongRef.Main
+}
+
+export interface PublicationViewExternalSource {
+  $type?: 'app.bsky.embed.external#viewExternalSource'
+  uri?: string
+  icon?: string
+  name?: string
+  description?: string
+  theme?: PublicationViewExternalSourceTheme
+  associatedRecord?: ComAtprotoRepoStrongRef.Main
+}
+
+export interface PublicationViewExternalSourceTheme {
+  $type?: 'app.bsky.embed.external#viewExternalSourceTheme'
+  background?: PublicationColorRGB
+  foreground?: PublicationColorRGB
+  accent?: PublicationColorRGB
+  accentForeground?: PublicationColorRGB
+}
+
+export interface PublicationColorRGB {
+  r: number
+  g: number
+  b: number
+}
diff --git a/src/lib/api/resolve.ts b/src/lib/api/resolve.ts
index fdf9878857..3e97dbf1fd 100644
--- a/src/lib/api/resolve.ts
+++ b/src/lib/api/resolve.ts
@@ -26,6 +26,7 @@ import {
 } from '#/lib/strings/url-helpers'
 import {type ComposerImage} from '#/state/gallery'
 import {createComposerImage} from '#/state/gallery'
+import {type PublicationViewExternalSource} from '#/components/Post/Embed/ExternalEmbed/PublicationEmbed/types'
 import {type Gif} from '#/features/gifPicker/types'
 import {createGIFDescription} from '../gif-alt-text'
 
@@ -40,6 +41,11 @@ type ResolvedExternalLink = {
    * it exists. Example: a site.standard.document record.
    */
   associatedRecord?: LinkMeta['associatedRecord']
+  // APP-2160 / APP-2155: populated by Cardyb when the URL resolves to a
+  // standard.site publication. Until APP-2155 ships these stay undefined.
+  source?: PublicationViewExternalSource
+  createdAt?: string
+  readingTime?: number
 }
 
 type ResolvedPostRecord = {