diff --git a/lib/shared/dm-ops/dm-op-utils.js b/lib/shared/dm-ops/dm-op-utils.js
--- a/lib/shared/dm-ops/dm-op-utils.js
+++ b/lib/shared/dm-ops/dm-op-utils.js
@@ -11,6 +11,7 @@
   DMAddMembersOperation,
   DMAddViewerToThreadMembersOperation,
   DMOperation,
+  ComposableDMOperation,
 } from '../../types/dm-ops.js';
 import type {
   ThickRawThreadInfo,
@@ -68,18 +69,30 @@
   INBOUND: 'InboundDMOperationSpecification',
 });
 
+type OutboundDMOperationSpecificationRecipients =
+  | { +type: 'all_peer_devices' | 'self_devices' }
+  | { +type: 'some_users', +userIDs: $ReadOnlyArray<string> }
+  | { +type: 'all_thread_members', +threadID: string };
+
 // The operation generated on the sending client, causes changes to
 // the state and broadcasting information to peers.
 export type OutboundDMOperationSpecification = {
   +type: 'OutboundDMOperationSpecification',
   +op: DMOperation,
-  +recipients:
-    | { +type: 'all_peer_devices' | 'self_devices' }
-    | { +type: 'some_users', +userIDs: $ReadOnlyArray<string> }
-    | { +type: 'all_thread_members', +threadID: string },
+  +recipients: OutboundDMOperationSpecificationRecipients,
   +sendOnly?: boolean,
 };
 
+export type OutboundComposableDMOperationSpecification = {
+  +type: 'OutboundDMOperationSpecification',
+  +op: ComposableDMOperation,
+  +recipients: OutboundDMOperationSpecificationRecipients,
+  // Composable DM Ops are created only to be sent, locally we use
+  // dedicated mechanism for updating the store.
+  +sendOnly: true,
+  +composableMessageID: string,
+};
+
 // The operation received from other peers, causes changes to
 // the state and after processing, sends confirmation to the sender.
 export type InboundDMOperationSpecification = {
diff --git a/lib/types/dm-ops.js b/lib/types/dm-ops.js
--- a/lib/types/dm-ops.js
+++ b/lib/types/dm-ops.js
@@ -366,6 +366,10 @@
     unread: t.Boolean,
   });
 
+export type ComposableDMOperation =
+  | DMSendTextMessageOperation
+  | DMSendMultimediaMessageOperation;
+
 export type DMOperation =
   | DMCreateThreadOperation
   | DMCreateSidebarOperation