diff --git a/native/cpp/CommonCpp/grpc/protos/tunnelbroker.proto b/native/cpp/CommonCpp/grpc/protos/tunnelbroker.proto
--- a/native/cpp/CommonCpp/grpc/protos/tunnelbroker.proto
+++ b/native/cpp/CommonCpp/grpc/protos/tunnelbroker.proto
@@ -20,6 +20,7 @@
   rpc NewSession(NewSessionRequest) returns (NewSessionResponse) {}
   rpc Send(SendRequest) returns (google.protobuf.Empty) {}
   rpc Get(GetRequest) returns (stream GetResponse) {}
+  rpc ConfirmCheckpoint(ConfirmCheckpointRequest) returns (google.protobuf.Empty) {}
 
   // Replacing Send and Get with a single bidirectional streaming RPC
   rpc OpenStream(stream OutboundMessage) returns (stream InboundMessage) {}
@@ -76,6 +77,11 @@
   repeated string blobHashes = 3;
 }
 
+message ConfirmCheckpointRequest {
+  string sessionID = 1;
+  string checkpointTime = 2;
+}
+
 message OutboundMessage {
   string toDeviceID = 1;
   string payload = 2;