diff --git a/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_personal_zephyr_mirrors b/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_personal_zephyr_mirrors
index f2ef24fd2c..1154889a9d 100755
--- a/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_personal_zephyr_mirrors
+++ b/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_personal_zephyr_mirrors
@@ -13,16 +13,17 @@ from __future__ import print_function
 import os
 import time
 
-RESULTS_DIR = "/home/zulip/mirror_status"
+RESULTS_DIR = "/home/zulip/mirror_status" # type: str
 
 states = {
     "OK": 0,
     "WARNING": 1,
     "CRITICAL": 2,
     "UNKNOWN": 3
-    }
+    } # type: Dict[str, int]
 
 def report(state, output):
+    # type: (str, str) -> None
     print("%s\n%s" % (state, output))
     exit(states[state])
 
diff --git a/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_user_zephyr_mirror_liveness b/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_user_zephyr_mirror_liveness
index 6972496107..36a1d55396 100755
--- a/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_user_zephyr_mirror_liveness
+++ b/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_user_zephyr_mirror_liveness
@@ -27,14 +27,18 @@ django.setup()
 
 from zerver.models import UserActivity
 
+if False:
+    from typing import Any
+
 states = {
     "OK": 0,
     "WARNING": 1,
     "CRITICAL": 2,
     "UNKNOWN": 3
-    }
+    } # type: Dict[str, int]
 
 def report(state, short_msg, too_old=None):
+    # type: (str, str, Set[Any]) -> None
     too_old_data = ""
     if too_old:
         too_old_data = "\nLast call to get_message for recently out of date mirrors:\n" + "\n".join(
diff --git a/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_zephyr_mirror b/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_zephyr_mirror
index 268acbe891..8e7cdfbd9f 100755
--- a/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_zephyr_mirror
+++ b/puppet/zulip_ops/files/nagios_plugins/zulip_zephyr_mirror/check_zephyr_mirror
@@ -20,9 +20,10 @@ states = {
     "WARNING": 1,
     "CRITICAL": 2,
     "UNKNOWN": 3
-    }
+    } # type: Dict[str, int]
 
 def report(state, data, last_check):
+    # type: (str, str, float) -> None
     print("%s: Last test run completed at %s\n%s" % (
         state, time.strftime("%Y-%m-%d %H:%M %Z", time.gmtime(last_check)),
         data))
diff --git a/puppet/zulip_ops/files/zulip-ec2-configure-interfaces b/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
index f10b253e20..e7eaded5a4 100755
--- a/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
+++ b/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
@@ -54,14 +54,18 @@ import sys
 import boto.utils
 import netifaces
 from six.moves import range
+if False:
+    from typing import Optional
 
 def address_of(device_id):
+    # type: (int) -> Optional[str]
     try:
         return netifaces.ifaddresses("ens%i" % device_id)[netifaces.AF_INET][0]['addr']
     except KeyError:
         return None
 
 def guess_gateway(device_id):
+    # type: (int) -> str
     # This will not work if the default gateway isn't n.n.n.1.
     address = address_of(device_id).split('.')
     address[3] = '1'
diff --git a/tools/run-mypy b/tools/run-mypy
index 1694e0ec54..e100eda528 100755
--- a/tools/run-mypy
+++ b/tools/run-mypy
@@ -40,7 +40,6 @@ api/zulip/__init__.py
 bots/githook-post-receive
 bots/jabber_mirror_backend.py
 bots/zephyr_mirror_backend.py
-puppet/zulip_ops
 tools/deprecated/inject-messages/inject-messages
 zproject/settings.py
 zproject/test_settings.py