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diff --git a/grpc/src/cpp/server/csds/csds.h b/grpc/src/cpp/server/csds/csds.h
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+++ b/grpc/src/cpp/server/csds/csds.h
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+//
+//
+// Copyright 2021 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
+#ifndef GRPC_INTERNAL_CPP_SERVER_CSDS_H
+#define GRPC_INTERNAL_CPP_SERVER_CSDS_H
+
+#include <grpc/support/port_platform.h>
+#include <grpcpp/grpcpp.h>
+#include "absl/status/status.h"
+
+#include "src/proto/grpc/testing/xds/v3/csds.grpc.pb.h"
+
+namespace grpc {
+namespace xds {
+namespace experimental {
+
+// The implementation of
+// envoy::service::status::v3::ClientStatusDiscoveryService
+class ClientStatusDiscoveryService final
+    : public envoy::service::status::v3::ClientStatusDiscoveryService::Service {
+ public:
+  // A streaming call that responds client status for each request.
+  Status StreamClientStatus(
+      ServerContext* /*context*/,
+      ServerReaderWriter<envoy::service::status::v3::ClientStatusResponse,
+                         envoy::service::status::v3::ClientStatusRequest>*
+          stream) override;
+
+  // An unary call to fetch client status.
+  Status FetchClientStatus(
+      ServerContext* /*unused*/,
+      const envoy::service::status::v3::ClientStatusRequest* /*request*/,
+      envoy::service::status::v3::ClientStatusResponse* response) override;
+};
+
+}  // namespace experimental
+}  // namespace xds
+}  // namespace grpc
+
+#endif  // GRPC_INTERNAL_CPP_SERVER_CSDS_H