diff --git a/framework/warmup.py b/framework/warmup.py
new file mode 100644
index 0000000..ef8a53d
--- /dev/null
+++ b/framework/warmup.py
@@ -0,0 +1,51 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""A class to handle the initial warmup request from AppEngine."""
+from __future__ import print_function
+from __future__ import division
+from __future__ import absolute_import
+
+import logging
+
+from framework import jsonfeed
+
+
+class Warmup(jsonfeed.InternalTask):
+  """Placeholder for warmup work.  Used only to enable min_idle_instances."""
+
+  def HandleRequest(self, _mr):
+    """Don't do anything that could cause a jam when many instances start."""
+    logging.info('/_ah/startup does nothing in Monorail.')
+    logging.info('However it is needed for min_idle_instances in app.yaml.')
+
+    return {
+      'success': 1,
+      }
+
+class Start(jsonfeed.InternalTask):
+  """Placeholder for start work.  Used only to enable manual_scaling."""
+
+  def HandleRequest(self, _mr):
+    """Don't do anything that could cause a jam when many instances start."""
+    logging.info('/_ah/start does nothing in Monorail.')
+    logging.info('However it is needed for manual_scaling in app.yaml.')
+
+    return {
+      'success': 1,
+      }
+
+
+class Stop(jsonfeed.InternalTask):
+  """Placeholder for stop work.  Used only to enable manual_scaling."""
+
+  def HandleRequest(self, _mr):
+    """Don't do anything that could cause a jam when many instances start."""
+    logging.info('/_ah/stop does nothing in Monorail.')
+    logging.info('However it is needed for manual_scaling in app.yaml.')
+
+    return {
+      'success': 1,
+      }