diff --git a/changes.proto b/changes.proto
index c1fe044..6b48a18 100644
--- a/changes.proto
+++ b/changes.proto
@@ -71,6 +71,8 @@ service ChangesService {
   rpc UpdateChange(UpdateChangeRequest) returns (UpdateChangeResponse);
   // Deletes a change
   rpc DeleteChange(DeleteChangeRequest) returns (DeleteChangeResponse);
+  // Lists all changes for a snapshot UUID
+  rpc ListChangesBySnapshotUUID(ListChangesBySnapshotUUIDRequest) returns (ListChangesBySnapshotUUIDResponse);
 
   // Get the timeline of changes for a given change
   rpc GetChangeTimeline(GetChangeTimelineRequest) returns (GetChangeTimelineResponse);
@@ -777,6 +779,15 @@ message DeleteChangeRequest {
   bytes UUID = 1;
 }
 
+// list changes for a snapshot UUID
+message ListChangesBySnapshotUUIDRequest {
+  bytes UUID = 1;
+}
+
+message ListChangesBySnapshotUUIDResponse {
+  repeated changes.Change changes = 1;
+}
+
 message DeleteChangeResponse {}
 
 message RefreshStateRequest {}
diff --git a/gateway.proto b/gateway.proto
index 8df5ae8..b9c84a1 100644
--- a/gateway.proto
+++ b/gateway.proto
@@ -60,6 +60,7 @@ message GatewayRequest {
         // CancelLoadBookmark cancelLoadBookmark = ??;
         // // undo the loading of a Bookmark
         // UndoLoadBookmark undoLoadBookmark = ??;
+        ChatMessage chatMessage = 16;
     }
 
     optional google.protobuf.Duration minStatusInterval = 2; // Minimum time between status updates. Setting this value too low can result in too many status messages
@@ -90,6 +91,8 @@ message GatewayResponse {
         BookmarkLoadResult bookmarkLoadResult = 16;
 
         QueryStatus queryStatus = 17; // Status of requested queries
+
+        ChatMessageResult chatMessageResult = 18;
     }
 }
 
@@ -205,3 +208,15 @@ message SnapshotLoadResult {
     // a correlation ID to match up requests and responses. this field returns the contents of the request's msgID
     bytes msgID = 4;
 }
+
+message ChatMessage {
+    // The message to create
+    string message = 1;
+}
+
+message ChatMessageResult {
+    oneof response_type {
+        string error = 1;
+        string message = 2;
+    }
+}