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diff --git a/include/grpcpp/impl/codegen/call_op_set_interface.h b/include/grpcpp/impl/codegen/call_op_set_interface.h
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+++ b/include/grpcpp/impl/codegen/call_op_set_interface.h
@@ -0,0 +1,59 @@
+/*
+ *
+ * Copyright 2018 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 GRPCPP_IMPL_CODEGEN_CALL_OP_SET_INTERFACE_H
+#define GRPCPP_IMPL_CODEGEN_CALL_OP_SET_INTERFACE_H
+
+#include <grpcpp/impl/codegen/completion_queue_tag.h>
+
+namespace grpc {
+namespace internal {
+
+class Call;
+
+/// An abstract collection of call ops, used to generate the
+/// grpc_call_op structure to pass down to the lower layers,
+/// and as it is-a CompletionQueueTag, also massages the final
+/// completion into the correct form for consumption in the C++
+/// API.
+class CallOpSetInterface : public CompletionQueueTag {
+ public:
+  /// Fills in grpc_op, starting from ops[*nops] and moving
+  /// upwards.
+  virtual void FillOps(internal::Call* call) = 0;
+
+  /// Get the tag to be used at the core completion queue. Generally, the
+  /// value of core_cq_tag will be "this". However, it can be overridden if we
+  /// want core to process the tag differently (e.g., as a core callback)
+  virtual void* core_cq_tag() = 0;
+
+  // This will be called while interceptors are run if the RPC is a hijacked
+  // RPC. This should set hijacking state for each of the ops.
+  virtual void SetHijackingState() = 0;
+
+  // Should be called after interceptors are done running
+  virtual void ContinueFillOpsAfterInterception() = 0;
+
+  // Should be called after interceptors are done running on the finalize result
+  // path
+  virtual void ContinueFinalizeResultAfterInterception() = 0;
+};
+}  // namespace internal
+}  // namespace grpc
+
+#endif  // GRPCPP_IMPL_CODEGEN_CALL_OP_SET_INTERFACE_H