diff --git a/recipes/release/release.proto b/recipes/release/release.proto
new file mode 100644
index 0000000..e28269f
--- /dev/null
+++ b/recipes/release/release.proto
@@ -0,0 +1,83 @@
+// Copyright 2019 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto3";
+package recipes.flutter.release.release;
+
+message GClientVariables {
+  bool download_fuchsia_sdk = 1;
+  string fuchsia_sdk_path = 2;
+}
+
+message InputProperties {
+  string mastername = 1;
+  string goma_jobs = 2;
+
+  // License keys for the Android SDK.
+  string android_sdk_license = 3;
+  string android_sdk_preview_license = 4;
+
+  // Which artifacts to build.
+  // TODO(dnfield): Deprecate these in favor of actually passing in
+  // build artifacts to use.
+  bool build_host = 5;
+  bool build_fuchsia = 6;
+  bool build_android_aot = 7;
+  bool build_android_debug = 8;
+  bool build_android_vulkan = 9;
+
+  // Whether to actually upload results to the bucket.
+  bool upload_packages = 10;
+
+  // Used to override the git ref/url. Only for experimental or non-prod builds.
+  string git_url = 11;
+  string git_ref = 12;
+
+  string jazzy_version = 13;
+  string xcpretty_version = 14;
+
+  bool build_ios = 15;
+  bool ios_debug = 16;
+  bool ios_profile = 17;
+  bool ios_release = 18;
+  bool no_bitcode = 19;
+  bool no_maven = 20;
+  bool clobber=21;
+
+  string fuchsia_ctl_version = 22;
+  bool build_font_subset = 23;
+  bool test_fuchsia = 24;
+  // Override previous upload check, defaults to False
+  bool force_upload = 25;
+  bool build_android_jit_release = 26;
+  bool no_lto = 27;
+
+  // CIPD tag for fuchsia/vdl/...
+  string vdl_version = 28;
+
+  // Whether to build Windows UWP artifacts.
+  // UWP support removed: https://github.com/flutter/flutter/issues/102172
+  reserved 29; // deprecated build_windows_uwp field
+
+  // Upload engine benchmarks.
+  bool upload_metrics = 30;
+
+  // GClient variables.
+  GClientVariables gclient_variables = 31;
+
+  // emulator architecture to run tests on
+  // Currently only used by femu_test
+  string emulator_arch = 32;
+
+  // github repository name variable
+  string repository = 33;
+}
+
+message EnvProperties {
+  string SWARMING_TASK_ID = 1;
+
+  // Whether to skip android build. 'TRUE' skips the build.
+  // Intentionally not using a boolean as protobuf doesn't allow null defaults.
+  string SKIP_ANDROID = 2;
+}
\ No newline at end of file
diff --git a/recipes/release/release_builder.py b/recipes/release/release_builder.py
index 2171d10..b5c9736 100644
--- a/recipes/release/release_builder.py
+++ b/recipes/release/release_builder.py
@@ -11,8 +11,8 @@
 import json
 from contextlib import contextmanager
 
-from PB.recipes.flutter.engine.engine import InputProperties
-from PB.recipes.flutter.engine.engine import EnvProperties
+from PB.recipes.flutter.release.release import InputProperties
+from PB.recipes.flutter.release.release import EnvProperties
 
 from google.protobuf import struct_pb2