diff --git a/keyserver/src/creators/message-creator.js b/keyserver/src/creators/message-creator.js
--- a/keyserver/src/creators/message-creator.js
+++ b/keyserver/src/creators/message-creator.js
@@ -186,6 +186,7 @@
     threadsToMessageIndices,
     subthreadPermissionsToCheck,
     stripLocalIDs(newMessageInfos),
+    newMessageDatas,
     updatesForCurrentSession,
   );
   if (!viewer.isScriptViewer) {
@@ -291,6 +292,7 @@
   threadsToMessageIndices: Map<string, number[]>,
   subthreadPermissionsToCheck: Set<string>,
   messageInfos: RawMessageInfo[],
+  messageDatas: MessageData[],
   updatesForCurrentSession: UpdatesForCurrentSession,
 ) {
   let joinIndex = 0;
@@ -435,12 +437,17 @@
             return undefined;
           }
           const { generatesNotifs } = messageSpecs[type];
-          const doesGenerateNotif = await generatesNotifs(messageInfo, {
-            notifTargetUserID: userID,
-            userNotMemberOfSubthreads,
-            fetchMessageInfoByID: (messageID: string) =>
-              fetchMessageInfoByID(viewer, messageID),
-          });
+          const messageData = messageDatas[messageIndex];
+          const doesGenerateNotif = await generatesNotifs(
+            messageInfo,
+            messageData,
+            {
+              notifTargetUserID: userID,
+              userNotMemberOfSubthreads,
+              fetchMessageInfoByID: (messageID: string) =>
+                fetchMessageInfoByID(viewer, messageID),
+            },
+          );
           return doesGenerateNotif === pushTypes.NOTIF
             ? messageInfo
             : undefined;
diff --git a/lib/shared/messages/create-sub-thread-message-spec.js b/lib/shared/messages/create-sub-thread-message-spec.js
--- a/lib/shared/messages/create-sub-thread-message-spec.js
+++ b/lib/shared/messages/create-sub-thread-message-spec.js
@@ -146,6 +146,7 @@
 
   generatesNotifs: async (
     rawMessageInfo: RawCreateSubthreadMessageInfo,
+    messageData: CreateSubthreadMessageData,
     params: GeneratesNotifsParams,
   ) => {
     const { userNotMemberOfSubthreads } = params;
diff --git a/lib/shared/messages/message-spec.js b/lib/shared/messages/message-spec.js
--- a/lib/shared/messages/message-spec.js
+++ b/lib/shared/messages/message-spec.js
@@ -96,6 +96,7 @@
   +notificationCollapseKey?: (rawMessageInfo: RawInfo) => string,
   +generatesNotifs: (
     rawMessageInfo: RawInfo,
+    messageData: Data,
     params: GeneratesNotifsParams,
   ) => Promise<?PushType>,
   +userIDs?: (rawMessageInfo: RawInfo) => $ReadOnlyArray<string>,
diff --git a/lib/shared/messages/reaction-message-spec.js b/lib/shared/messages/reaction-message-spec.js
--- a/lib/shared/messages/reaction-message-spec.js
+++ b/lib/shared/messages/reaction-message-spec.js
@@ -199,6 +199,7 @@
 
   generatesNotifs: async (
     rawMessageInfo: RawReactionMessageInfo,
+    messageData: ReactionMessageData,
     params: GeneratesNotifsParams,
   ) => {
     const { notifTargetUserID, fetchMessageInfoByID } = params;