@@ -0,0 +1,18 @@
+---
+'@object-ui/collaboration': patch
+'@object-ui/types': patch
+---
+
+refactor(collaboration, types)!: retire the zero-consumer `useMentionNotifications` hook and the `MentionNotification` interface
+
+Clause-②: no (narrowing)
+Metadata-protocol: none
+
+<!-- adr-0087: not-required (runtime-export-retired @object-ui/collaboration#useMentionNotifications, @object-ui/collaboration#MentionNotificationsConfig, @object-ui/collaboration#MentionNotificationsResult, @object-ui/types#MentionNotification) the retired operands are a React hook that kept an in-memory list of mention notifications, its two TypeScript config and result interfaces, and the `MentionNotification` interface of `@object-ui/types` that only the hook read; nothing in the workspace or in hotcrm imports any of them (the console bell reads the server inbox through `useInboxBell`), and no packages/spec schema, registered node type, conversion surface or stored shape names them, so there is nothing for `objectstack migrate meta` to rewrite -->
+
+**BREAKING** for a host that imports `useMentionNotifications`, `MentionNotificationsConfig` or `MentionNotificationsResult` from `@object-ui/collaboration`, or the type `MentionNotification` from `@object-ui/types`. The hook held a client-side list of mention notifications with read flags; no console surface used it, because mention notifications are server records (`sys_notification`, topic `collab.mention`) that the console bell reads from the inbox feed. `CommentEntry` and `ActivityEntry` stay exported unchanged. The `CommentSearchResult` entry of this release said `MentionNotification` stays exported; it leaves here.
+
+- FROM `useMentionNotifications` TO a local hook in your own code, or read the server inbox (`GET /api/v1/notifications`) as the console bell does.
+- FROM `MentionNotificationsConfig` TO a local interface in your own code: `{ currentUserId: string; initialNotifications?: MentionNotification[]; onDeliver?: (notification: MentionNotification) => void | Promise<void> }`.
+- FROM `MentionNotificationsResult` TO a local interface in your own code, typed by what your own hook returns.
+- FROM `MentionNotification` TO a local interface in your own code: `{ id: string; type: 'mention'; recipientId: string; commentId: string | number; mentionedBy: string; commentText: string; objectName?: string; recordId?: string; createdAt: string; read?: boolean; channels?: Array<'in_app' | 'email' | 'push'> }`.
@@ -62,12 +62,6 @@ export {
   type CollaborationTranslate,
 } from './useCollaborationTranslation.js';
 
-export {
-  useMentionNotifications,
-  type MentionNotificationsConfig,
-  type MentionNotificationsResult,
-} from './useMentionNotifications.js';
-
 export {
   PresenceAvatars,
   type PresenceAvatarsProps,
 
@@ -14,7 +14,8 @@
  *
  * Director batch #195 item 1, letter A (objectui#9511) made a record id a
  * `string` wherever METADATA names one, and extended it as "the same
- * principle" to `CommentEntry.recordId` / `MentionNotification.recordId`. The
+ * principle" to `CommentEntry.recordId` and to the `recordId` of a mention
+ * notification interface that has since been retired with its only reader. The
  * two below are runtime / API shapes that ruling did not name; carrying the
  * rule to them is the `domain:spec` seat's inheritance decision in the claim on
  * objectui#10078. Each carried the same id with the old `string | number`
 
@@ -1070,7 +1070,6 @@ export type {
   DetailSectionNodeSchema,
   ViewComponentSchema,
   CommentEntry,
-  MentionNotification,
   ActivityEntry,
   // Feed / Chatter Protocol Types
   FeedItemType,
 
@@ -479,34 +479,6 @@ export interface CommentEntry {
   recordId?: string;
 }
 
-/**
- * Mention notification - delivered when a user is @mentioned in a comment
- */
-export interface MentionNotification {
-  /** Unique notification ID */
-  id: string;
-  /** Type of notification */
-  type: 'mention';
-  /** ID of the user being notified */
-  recipientId: string;
-  /** The comment that contains the mention */
-  commentId: string | number;
-  /** Author who mentioned the recipient */
-  mentionedBy: string;
-  /** The comment text (or excerpt) */
-  commentText: string;
-  /** Object name the comment belongs to */
-  objectName?: string;
-  /** Record ID the comment belongs to. A string, per the one record-id rule (objectui#9511). */
-  recordId?: string;
-  /** When the mention was created */
-  createdAt: string;
-  /** Whether the notification has been read */
-  read?: boolean;
-  /** Delivery channels */
-  channels?: Array<'in_app' | 'email' | 'push'>;
-}
-
 /**
  * Activity Entry - represents a single activity/field change on a record
  */