diff --git a/ReactCommon/hermes/inspector/chrome/MessageTypes.cpp b/ReactCommon/hermes/inspector/chrome/MessageTypes.cpp
index b7cab9c550e..9e278ae531c 100644
--- a/ReactCommon/hermes/inspector/chrome/MessageTypes.cpp
+++ b/ReactCommon/hermes/inspector/chrome/MessageTypes.cpp
@@ -1,5 +1,5 @@
-// Copyright 2004-present Facebook. All Rights Reserved.
-// @generated <<SignedSource::*O*zOeWoEQle#+L!plEphiEmie@IsG>>
+// Copyright (c) Meta Platforms, Inc. and affiliates. All Rights Reserved.
+// @generated SignedSource<<130ce3da2ad67004eb7bb91f19028a89>>
 
 #include "MessageTypes.h"
 
diff --git a/ReactCommon/hermes/inspector/chrome/MessageTypes.h b/ReactCommon/hermes/inspector/chrome/MessageTypes.h
index 10ff9e4ca32..5979d2f6889 100644
--- a/ReactCommon/hermes/inspector/chrome/MessageTypes.h
+++ b/ReactCommon/hermes/inspector/chrome/MessageTypes.h
@@ -1,5 +1,5 @@
-// Copyright 2004-present Facebook. All Rights Reserved.
-// @generated <<SignedSource::*O*zOeWoEQle#+L!plEphiEmie@IsG>>
+// Copyright (c) Meta Platforms, Inc. and affiliates. All Rights Reserved.
+// @generated SignedSource<<41786947d74eb3f47d8168b82b5ccf85>>
 
 #pragma once
 
diff --git a/ReactCommon/hermes/inspector/tools/msggen/src/GeneratedHeader.js b/ReactCommon/hermes/inspector/tools/msggen/src/GeneratedHeader.js
index 7375312ee78..9533b2425e2 100644
--- a/ReactCommon/hermes/inspector/tools/msggen/src/GeneratedHeader.js
+++ b/ReactCommon/hermes/inspector/tools/msggen/src/GeneratedHeader.js
@@ -12,5 +12,5 @@
 
 // placeholder token that will be replaced by signedsource script
 export const GeneratedHeader: string =
-  '// Copyright 2004-present Facebook. All Rights Reserved.\n' +
+  '// Copyright (c) Meta Platforms, Inc. and affiliates. All Rights Reserved.\n' +
   '// @generated <<SignedSource::*O*zOeWoEQle#+L!plEphiEmie@IsG>>';
diff --git a/ReactCommon/hermes/inspector/tools/run_msggen b/ReactCommon/hermes/inspector/tools/run_msggen
index c349b70be6c..afe7901ea62 100755
--- a/ReactCommon/hermes/inspector/tools/run_msggen
+++ b/ReactCommon/hermes/inspector/tools/run_msggen
@@ -3,24 +3,28 @@
 set -e
 
 DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
-cd "${DIR}/msggen"
-
-yarn install
-yarn build
 
 MSGTYPES_PATH="${DIR}/message_types.txt"
 HEADER_PATH="${DIR}/../chrome/MessageTypes.h"
 CPP_PATH="${DIR}/../chrome/MessageTypes.cpp"
 
+FBSOURCE=$(hg root)
+CLANG_FORMAT="${FBSOURCE}/tools/third-party/clang-format/clang-format"
+SIGNEDSOURCE="${FBSOURCE}/tools/signedsource"
+
+cd "${DIR}/msggen"
+
+yarn install
+yarn build
+
 node bin/index.js \
   --ignore-experimental \
   --include-experimental=Runtime.getHeapUsage \
-  --roots "$MSGTYPES_PATH" \
-  "$HEADER_PATH" "$CPP_PATH"
+  --roots "${MSGTYPES_PATH}" \
+  "${HEADER_PATH}" "${CPP_PATH}"
 
-clang-format -i --style=file "$HEADER_PATH"
-clang-format -i --style=file "$CPP_PATH"
+"${CLANG_FORMAT}" -i --style=file "${HEADER_PATH}"
+"${CLANG_FORMAT}" -i --style=file "${CPP_PATH}"
 
-FBSOURCE=$(hg root)
-"${FBSOURCE}/tools/signedsource" sign "$HEADER_PATH"
-"${FBSOURCE}/tools/signedsource" sign "$CPP_PATH"
+"${SIGNEDSOURCE}" sign "${HEADER_PATH}"
+"${SIGNEDSOURCE}" sign "${CPP_PATH}"