diff --git a/benchmarks/src/generated/main/grpc/io/grpc/testing/TestServiceGrpc.java b/benchmarks/src/generated/main/grpc/io/grpc/testing/TestServiceGrpc.java
index 553e55a..13bba51 100644
--- a/benchmarks/src/generated/main/grpc/io/grpc/testing/TestServiceGrpc.java
+++ b/benchmarks/src/generated/main/grpc/io/grpc/testing/TestServiceGrpc.java
@@ -17,6 +17,7 @@
 public class TestServiceGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.SimpleRequest,
       io.grpc.testing.SimpleResponse> METHOD_UNARY_CALL =
       io.grpc.MethodDescriptor.create(
@@ -25,6 +26,7 @@
               "grpc.testing.TestService", "UnaryCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.SimpleRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.SimpleResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.SimpleRequest,
       io.grpc.testing.SimpleResponse> METHOD_STREAMING_CALL =
       io.grpc.MethodDescriptor.create(
diff --git a/benchmarks/src/generated/main/grpc/io/grpc/testing/WorkerGrpc.java b/benchmarks/src/generated/main/grpc/io/grpc/testing/WorkerGrpc.java
index fd356e2..064389a 100644
--- a/benchmarks/src/generated/main/grpc/io/grpc/testing/WorkerGrpc.java
+++ b/benchmarks/src/generated/main/grpc/io/grpc/testing/WorkerGrpc.java
@@ -17,6 +17,7 @@
 public class WorkerGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.ClientArgs,
       io.grpc.testing.ClientStatus> METHOD_RUN_TEST =
       io.grpc.MethodDescriptor.create(
@@ -25,6 +26,7 @@
               "grpc.testing.Worker", "RunTest"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.ClientArgs.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.ClientStatus.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.ServerArgs,
       io.grpc.testing.ServerStatus> METHOD_RUN_SERVER =
       io.grpc.MethodDescriptor.create(
diff --git a/compiler/src/java_plugin/cpp/java_generator.cpp b/compiler/src/java_plugin/cpp/java_generator.cpp
index 6152dc5..4d725ee 100644
--- a/compiler/src/java_plugin/cpp/java_generator.cpp
+++ b/compiler/src/java_plugin/cpp/java_generator.cpp
@@ -107,6 +107,7 @@
       // share the same request or response messages.
       p->Print(
           *vars,
+          "@$ExperimentalApi$\n"
           "public static final $MethodDescriptor$<$input_type$,\n"
           "    $output_type$> $method_field_name$ =\n"
           "    $MethodDescriptor$.create(\n"
@@ -132,6 +133,7 @@
     } else {
       p->Print(
           *vars,
+          "@$ExperimentalApi$\n"
           "public static final $MethodDescriptor$<$input_type$,\n"
           "    $output_type$> $method_field_name$ =\n"
           "    $MethodDescriptor$.create(\n"
@@ -623,6 +625,7 @@
       "com.google.common.util.concurrent.ListenableFuture";
   vars["CodedInputByteBufferNano"] = 
       "com.google.protobuf.nano.CodedInputByteBufferNano";
+  vars["ExperimentalApi"] = "io.grpc.ExperimentalApi";
 
   Printer printer(out, '$');
   string package_name = ServiceJavaPackage(service->file());
diff --git a/compiler/src/test/golden/TestService.java.txt b/compiler/src/test/golden/TestService.java.txt
index 8bc7673..105aaba 100644
--- a/compiler/src/test/golden/TestService.java.txt
+++ b/compiler/src/test/golden/TestService.java.txt
@@ -17,6 +17,7 @@
 public class TestServiceGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Test.SimpleRequest,
       io.grpc.testing.integration.Test.SimpleResponse> METHOD_UNARY_CALL =
       io.grpc.MethodDescriptor.create(
@@ -25,6 +26,7 @@
               "grpc.testing.TestService", "UnaryCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.SimpleRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.SimpleResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Test.StreamingOutputCallRequest,
       io.grpc.testing.integration.Test.StreamingOutputCallResponse> METHOD_STREAMING_OUTPUT_CALL =
       io.grpc.MethodDescriptor.create(
@@ -33,6 +35,7 @@
               "grpc.testing.TestService", "StreamingOutputCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.StreamingOutputCallRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.StreamingOutputCallResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Test.StreamingInputCallRequest,
       io.grpc.testing.integration.Test.StreamingInputCallResponse> METHOD_STREAMING_INPUT_CALL =
       io.grpc.MethodDescriptor.create(
@@ -41,6 +44,7 @@
               "grpc.testing.TestService", "StreamingInputCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.StreamingInputCallRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.StreamingInputCallResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Test.StreamingOutputCallRequest,
       io.grpc.testing.integration.Test.StreamingOutputCallResponse> METHOD_FULL_BIDI_CALL =
       io.grpc.MethodDescriptor.create(
@@ -49,6 +53,7 @@
               "grpc.testing.TestService", "FullBidiCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.StreamingOutputCallRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Test.StreamingOutputCallResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Test.StreamingOutputCallRequest,
       io.grpc.testing.integration.Test.StreamingOutputCallResponse> METHOD_HALF_BIDI_CALL =
       io.grpc.MethodDescriptor.create(
diff --git a/compiler/src/test/golden/TestServiceNano.java.txt b/compiler/src/test/golden/TestServiceNano.java.txt
index a98a80f..916fe6b 100644
--- a/compiler/src/test/golden/TestServiceNano.java.txt
+++ b/compiler/src/test/golden/TestServiceNano.java.txt
@@ -19,6 +19,7 @@
 public class TestServiceGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.nano.Test.SimpleRequest,
       io.grpc.testing.integration.nano.Test.SimpleResponse> METHOD_UNARY_CALL =
       io.grpc.MethodDescriptor.create(
@@ -39,6 +40,7 @@
                       return io.grpc.testing.integration.nano.Test.SimpleResponse.parseFrom(input);
                   }
           }));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.nano.Test.StreamingOutputCallRequest,
       io.grpc.testing.integration.nano.Test.StreamingOutputCallResponse> METHOD_STREAMING_OUTPUT_CALL =
       io.grpc.MethodDescriptor.create(
@@ -59,6 +61,7 @@
                       return io.grpc.testing.integration.nano.Test.StreamingOutputCallResponse.parseFrom(input);
                   }
           }));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.nano.Test.StreamingInputCallRequest,
       io.grpc.testing.integration.nano.Test.StreamingInputCallResponse> METHOD_STREAMING_INPUT_CALL =
       io.grpc.MethodDescriptor.create(
@@ -79,6 +82,7 @@
                       return io.grpc.testing.integration.nano.Test.StreamingInputCallResponse.parseFrom(input);
                   }
           }));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.nano.Test.StreamingOutputCallRequest,
       io.grpc.testing.integration.nano.Test.StreamingOutputCallResponse> METHOD_FULL_BIDI_CALL =
       io.grpc.MethodDescriptor.create(
@@ -99,6 +103,7 @@
                       return io.grpc.testing.integration.nano.Test.StreamingOutputCallResponse.parseFrom(input);
                   }
           }));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.nano.Test.StreamingOutputCallRequest,
       io.grpc.testing.integration.nano.Test.StreamingOutputCallResponse> METHOD_HALF_BIDI_CALL =
       io.grpc.MethodDescriptor.create(
diff --git a/examples/src/generated/main/grpc/io/grpc/examples/helloworld/GreeterGrpc.java b/examples/src/generated/main/grpc/io/grpc/examples/helloworld/GreeterGrpc.java
index 517be00..1c561b1 100644
--- a/examples/src/generated/main/grpc/io/grpc/examples/helloworld/GreeterGrpc.java
+++ b/examples/src/generated/main/grpc/io/grpc/examples/helloworld/GreeterGrpc.java
@@ -17,6 +17,7 @@
 public class GreeterGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.examples.helloworld.HelloRequest,
       io.grpc.examples.helloworld.HelloResponse> METHOD_SAY_HELLO =
       io.grpc.MethodDescriptor.create(
diff --git a/examples/src/generated/main/grpc/io/grpc/examples/routeguide/RouteGuideGrpc.java b/examples/src/generated/main/grpc/io/grpc/examples/routeguide/RouteGuideGrpc.java
index 76b22ac..b31df9c 100644
--- a/examples/src/generated/main/grpc/io/grpc/examples/routeguide/RouteGuideGrpc.java
+++ b/examples/src/generated/main/grpc/io/grpc/examples/routeguide/RouteGuideGrpc.java
@@ -17,6 +17,7 @@
 public class RouteGuideGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.examples.routeguide.Point,
       io.grpc.examples.routeguide.Feature> METHOD_GET_FEATURE =
       io.grpc.MethodDescriptor.create(
@@ -25,6 +26,7 @@
               "routeguide.RouteGuide", "GetFeature"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.routeguide.Point.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.routeguide.Feature.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.examples.routeguide.Rectangle,
       io.grpc.examples.routeguide.Feature> METHOD_LIST_FEATURES =
       io.grpc.MethodDescriptor.create(
@@ -33,6 +35,7 @@
               "routeguide.RouteGuide", "ListFeatures"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.routeguide.Rectangle.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.routeguide.Feature.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.examples.routeguide.Point,
       io.grpc.examples.routeguide.RouteSummary> METHOD_RECORD_ROUTE =
       io.grpc.MethodDescriptor.create(
@@ -41,6 +44,7 @@
               "routeguide.RouteGuide", "RecordRoute"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.routeguide.Point.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.routeguide.RouteSummary.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.examples.routeguide.RouteNote,
       io.grpc.examples.routeguide.RouteNote> METHOD_ROUTE_CHAT =
       io.grpc.MethodDescriptor.create(
diff --git a/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/ReconnectServiceGrpc.java b/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/ReconnectServiceGrpc.java
index f04cb9a..d0a151e 100644
--- a/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/ReconnectServiceGrpc.java
+++ b/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/ReconnectServiceGrpc.java
@@ -17,6 +17,7 @@
 public class ReconnectServiceGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<com.google.protobuf.EmptyProtos.Empty,
       com.google.protobuf.EmptyProtos.Empty> METHOD_START =
       io.grpc.MethodDescriptor.create(
@@ -25,6 +26,7 @@
               "grpc.testing.ReconnectService", "Start"),
           io.grpc.protobuf.ProtoUtils.marshaller(com.google.protobuf.EmptyProtos.Empty.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(com.google.protobuf.EmptyProtos.Empty.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<com.google.protobuf.EmptyProtos.Empty,
       io.grpc.testing.integration.Messages.ReconnectInfo> METHOD_STOP =
       io.grpc.MethodDescriptor.create(
diff --git a/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/TestServiceGrpc.java b/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/TestServiceGrpc.java
index 57c13b8..d55d6d9 100644
--- a/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/TestServiceGrpc.java
+++ b/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/TestServiceGrpc.java
@@ -17,6 +17,7 @@
 public class TestServiceGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<com.google.protobuf.EmptyProtos.Empty,
       com.google.protobuf.EmptyProtos.Empty> METHOD_EMPTY_CALL =
       io.grpc.MethodDescriptor.create(
@@ -25,6 +26,7 @@
               "grpc.testing.TestService", "EmptyCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(com.google.protobuf.EmptyProtos.Empty.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(com.google.protobuf.EmptyProtos.Empty.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Messages.SimpleRequest,
       io.grpc.testing.integration.Messages.SimpleResponse> METHOD_UNARY_CALL =
       io.grpc.MethodDescriptor.create(
@@ -33,6 +35,7 @@
               "grpc.testing.TestService", "UnaryCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.SimpleRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.SimpleResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Messages.StreamingOutputCallRequest,
       io.grpc.testing.integration.Messages.StreamingOutputCallResponse> METHOD_STREAMING_OUTPUT_CALL =
       io.grpc.MethodDescriptor.create(
@@ -41,6 +44,7 @@
               "grpc.testing.TestService", "StreamingOutputCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.StreamingOutputCallRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.StreamingOutputCallResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Messages.StreamingInputCallRequest,
       io.grpc.testing.integration.Messages.StreamingInputCallResponse> METHOD_STREAMING_INPUT_CALL =
       io.grpc.MethodDescriptor.create(
@@ -49,6 +53,7 @@
               "grpc.testing.TestService", "StreamingInputCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.StreamingInputCallRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.StreamingInputCallResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Messages.StreamingOutputCallRequest,
       io.grpc.testing.integration.Messages.StreamingOutputCallResponse> METHOD_FULL_DUPLEX_CALL =
       io.grpc.MethodDescriptor.create(
@@ -57,6 +62,7 @@
               "grpc.testing.TestService", "FullDuplexCall"),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.StreamingOutputCallRequest.parser()),
           io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.testing.integration.Messages.StreamingOutputCallResponse.parser()));
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<io.grpc.testing.integration.Messages.StreamingOutputCallRequest,
       io.grpc.testing.integration.Messages.StreamingOutputCallResponse> METHOD_HALF_DUPLEX_CALL =
       io.grpc.MethodDescriptor.create(
diff --git a/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/UnimplementedServiceGrpc.java b/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/UnimplementedServiceGrpc.java
index 5bc4d34..9e1f4a9 100644
--- a/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/UnimplementedServiceGrpc.java
+++ b/interop-testing/src/generated/main/grpc/io/grpc/testing/integration/UnimplementedServiceGrpc.java
@@ -17,6 +17,7 @@
 public class UnimplementedServiceGrpc {
 
   // Static method descriptors that strictly reflect the proto.
+  @io.grpc.ExperimentalApi
   public static final io.grpc.MethodDescriptor<com.google.protobuf.EmptyProtos.Empty,
       com.google.protobuf.EmptyProtos.Empty> METHOD_UNIMPLEMENTED_CALL =
       io.grpc.MethodDescriptor.create(