@@ -172,6 +172,7 @@ One of the largest consumers of the flag;
 | 47b | The inbound-mail ingest seam: `ingest` admits the system context ALONE, and `rematch` admits it without the organization, owner or `manage_mailboxes` check | service-mailbox | Get: a mail source hands a mailbox its messages, and server code re-matches any mailbox. Lose: nothing a user held — every other caller of `ingest` is refused (`PERMISSION_DENIED`), because an ingested message is shown on every record its correspondents' addresses match and a user who could hand the seam a message could write one in a correspondent's name; every other caller of `rematch` must be in the mailbox's organization and own the mailbox or hold `manage_mailboxes` | `packages/services/service-mailbox/src/ingest/mail-ingest-service.ts#ingest`, `#authorizeRematch` |
 | 47c | The inbound-mail IMAP sync: `syncMailbox` and `syncAll` admit the system context ALONE | service-mailbox | Get: the sync job reads every mailbox row (its organization, address and IMAP cursor), writes the cursor back, and hands each fetched message to `ingest` under the system context. Lose: nothing a user held — every other caller is refused (`PERMISSION_DENIED`), because a sync stores a mailbox's mail and moves its cursor | `packages/services/service-mailbox/src/sync/mailbox-sync-service.ts#syncMailbox`, `#syncAll` |
 | 47d | The print service REFUSES the system context: `printRecordToFile` admits a human user acting for themselves alone | service-print | Get: nothing — a system caller is refused (`PERMISSION_DENIED`) before any page is read, session minted or browser started. Lose: nothing a user held — the PDF is rendered as the requesting user and never as the system, so a record is archived only by someone who could read it | `packages/services/service-print/src/print-service.ts#refuseUnlessHumanCaller` |
+| 47e | The caller-scoped attach verbs REFUSE the system context: `attachFileAs` and `assertMayAttach` admit a signed-in user alone | service-storage | Get: nothing — a system caller is refused (`PERMISSION_DENIED`); the system attaches through `attachFile`, whose rows name no user. Lose: nothing a user held — the caller-scoped verbs insert the attachment under the caller's context so every insert gate judges that user and both rows name them | `packages/services/service-storage/src/file-attachment-service.ts#requireUserContext` |
 
 ### 5. Actions, metadata plane, provenance, the organization wall
 
 
@@ -29,6 +29,7 @@ import type {
   IDataEngine,
   II18nService,
   ISecurityService,
+  ISharingService,
   IStorageService,
   IFileAccessDelegate,
   ApiKeyLifecyclePolicy,
@@ -367,7 +368,7 @@ export class StorageServicePlugin implements Plugin {
         // call, the same two services the `sys_attachment` insert gate asks.
         getSharing: () => {
           try {
-            return ctx.getService<any>('sharing');
+            return ctx.getService<ISharingService>('sharing');
           } catch {
             return null;
           }