diff --git a/tools/check-issue-labels b/tools/check-issue-labels
index 897c6b98fc..9c2c805f68 100755
--- a/tools/check-issue-labels
+++ b/tools/check-issue-labels
@@ -7,7 +7,7 @@ import sys
 import os
 
 import ConfigParser
-from typing import Any, Dict, MutableMapping, Optional
+from typing import Any, Dict, Optional
 
 # Scans zulip repositary for issues that don't have any `area` labels.
 # GitHub API token is required as GitHub limits unauthenticated
diff --git a/tools/check-templates b/tools/check-templates
index 54f341d449..ad3cae16e5 100755
--- a/tools/check-templates
+++ b/tools/check-templates
@@ -11,7 +11,7 @@ from lib import sanity_check
 sanity_check.check_venv(__file__)
 
 from zulint import lister
-from typing import cast, Callable, Dict, Iterable, List
+from typing import cast, Dict, Iterable, List
 
 EXCLUDED_FILES = [
     ## Test data Files for testing modules in tests
diff --git a/tools/create-test-api-docs b/tools/create-test-api-docs
index ea5dc8d205..4507f91e26 100755
--- a/tools/create-test-api-docs
+++ b/tools/create-test-api-docs
@@ -5,12 +5,11 @@ from lib import sanity_check
 sanity_check.check_venv(__file__)
 
 from collections import defaultdict
-from typing import Any, Dict, Iterable, List, Set
+from typing import Any, Dict, List, Set
 
 import cgi
 import os
 import pprint
-import re
 import ujson
 
 Call = Dict[str, Any]
diff --git a/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py b/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py
index 2cb04889e9..13f04fe332 100644
--- a/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py
+++ b/tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py
@@ -7,7 +7,7 @@ from scrapy.linkextractors import IGNORED_EXTENSIONS
 from scrapy.linkextractors.lxmlhtml import LxmlLinkExtractor
 from scrapy.utils.url import url_has_any_extension
 
-from typing import Any, Generator, List, Optional, Tuple
+from typing import Any, Generator, List, Optional
 
 EXCLUDED_URLS = [
     # Google calendar returns 404s on HEAD requests unconditionally
diff --git a/tools/find-add-class b/tools/find-add-class
index b3943fd81c..2a68b7c0bf 100755
--- a/tools/find-add-class
+++ b/tools/find-add-class
@@ -3,7 +3,6 @@
 from lib.find_add_class import display, find
 import glob
 import argparse
-import sys
 
 # check for the venv
 from lib import sanity_check
diff --git a/tools/lib/capitalization.py b/tools/lib/capitalization.py
index d00870a963..75241c998d 100644
--- a/tools/lib/capitalization.py
+++ b/tools/lib/capitalization.py
@@ -1,5 +1,5 @@
 
-from typing import List, Tuple, Set, Pattern, Match
+from typing import List, Tuple, Match
 import re
 
 from bs4 import BeautifulSoup
diff --git a/tools/lib/pretty_print.py b/tools/lib/pretty_print.py
index ae9ca8be0d..bcb53a9d31 100644
--- a/tools/lib/pretty_print.py
+++ b/tools/lib/pretty_print.py
@@ -3,7 +3,6 @@ from typing import Any, Dict, List
 
 from .template_parser import (
     tokenize,
-    Token,
     is_django_block_tag,
 )
 import subprocess
diff --git a/tools/lib/provision.py b/tools/lib/provision.py
index 84639a535f..32f394e3e6 100755
--- a/tools/lib/provision.py
+++ b/tools/lib/provision.py
@@ -7,17 +7,16 @@ import platform
 import subprocess
 import glob
 import hashlib
-import traceback
 
 os.environ["PYTHONUNBUFFERED"] = "y"
 
 ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 sys.path.append(ZULIP_PATH)
-from scripts.lib.zulip_tools import run, subprocess_text_output, OKBLUE, ENDC, WARNING, \
+from scripts.lib.zulip_tools import run, OKBLUE, ENDC, WARNING, \
     get_dev_uuid_var_path, FAIL, parse_lsb_release, file_or_package_hash_updated
 from scripts.lib.setup_venv import (
-    setup_virtualenv, VENV_DEPENDENCIES, REDHAT_VENV_DEPENDENCIES,
+    VENV_DEPENDENCIES, REDHAT_VENV_DEPENDENCIES,
     THUMBOR_VENV_DEPENDENCIES, YUM_THUMBOR_VENV_DEPENDENCIES,
     FEDORA_VENV_DEPENDENCIES
 )
diff --git a/tools/lib/test_server.py b/tools/lib/test_server.py
index 224ca17706..1bba23f43c 100644
--- a/tools/lib/test_server.py
+++ b/tools/lib/test_server.py
@@ -6,7 +6,7 @@ import time
 
 from contextlib import contextmanager
 
-from typing import (Any, Iterator, Optional)
+from typing import Iterator, Optional
 
 # Verify the Zulip venv is available.
 from tools.lib import sanity_check
diff --git a/tools/lint b/tools/lint
index a8c0763476..49d5a9de56 100755
--- a/tools/lint
+++ b/tools/lint
@@ -12,7 +12,7 @@ sanity_check.check_venv(__file__)
 
 from zulint import lister
 from zulint.command import add_default_linter_arguments, LinterConfig
-from typing import cast, Callable, Dict, Iterator, List
+from typing import cast, Dict, List
 import random
 
 def run():
diff --git a/tools/linter_lib/pep8.py b/tools/linter_lib/pep8.py
index b2ff0a6efb..c7daa2bb99 100644
--- a/tools/linter_lib/pep8.py
+++ b/tools/linter_lib/pep8.py
@@ -1,8 +1,6 @@
 from __future__ import print_function
 from __future__ import absolute_import
 
-import subprocess
-
 from zulint.linters import run_pycodestyle
 
 from typing import List
diff --git a/tools/linter_lib/pyflakes.py b/tools/linter_lib/pyflakes.py
index 18fe4519f4..cbd61cf249 100644
--- a/tools/linter_lib/pyflakes.py
+++ b/tools/linter_lib/pyflakes.py
@@ -6,7 +6,7 @@ import subprocess
 
 from zulint.printer import print_err, colors
 
-from typing import Any, Dict, List
+from typing import List
 
 suppress_patterns = [
     (b'', b'imported but unused'),
diff --git a/tools/run-dev.py b/tools/run-dev.py
index 04530864b5..bc427121e5 100755
--- a/tools/run-dev.py
+++ b/tools/run-dev.py
@@ -6,7 +6,6 @@ import pwd
 import signal
 import subprocess
 import sys
-import time
 import traceback
 
 from urllib.parse import urlunparse
diff --git a/tools/setup/emoji/build_emoji b/tools/setup/emoji/build_emoji
index 4a1ced3fcc..e7308b1d7d 100755
--- a/tools/setup/emoji/build_emoji
+++ b/tools/setup/emoji/build_emoji
@@ -11,7 +11,7 @@ from typing import Any, Dict, List, Optional
 
 from emoji_setup_utils import generate_emoji_catalog, generate_codepoint_to_name_map, \
     get_emoji_code, generate_name_to_codepoint_map, emoji_names_for_picker, \
-    EMOJISETS, EMOTICON_CONVERSIONS, REMAPPED_EMOJIS
+    EMOTICON_CONVERSIONS, REMAPPED_EMOJIS
 from emoji_names import EMOJI_NAME_MAPS
 
 ZULIP_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), '../../../')
diff --git a/tools/setup/setup_venvs.py b/tools/setup/setup_venvs.py
index 08dffab0d3..11a37226b3 100755
--- a/tools/setup/setup_venvs.py
+++ b/tools/setup/setup_venvs.py
@@ -8,7 +8,7 @@ if ZULIP_PATH not in sys.path:
     sys.path.append(ZULIP_PATH)
 
 from scripts.lib.setup_venv import setup_virtualenv
-from scripts.lib.zulip_tools import run, subprocess_text_output
+from scripts.lib.zulip_tools import subprocess_text_output
 
 VENV_PATH = "/srv/zulip-py3-venv"
 
diff --git a/tools/test-api b/tools/test-api
index e9b5b6773b..14534721a4 100755
--- a/tools/test-api
+++ b/tools/test-api
@@ -16,9 +16,7 @@ from zulip import Client
 
 from tools.lib.test_script import get_provisioning_status
 from tools.lib.test_server import test_server_running
-from zerver.lib.api_test_helpers import test_the_api, test_invalid_api_key, \
-    test_update_message_edit_permission_error, \
-    test_user_not_authorized_error, test_authorization_errors_fatal
+from zerver.lib.api_test_helpers import test_the_api, test_invalid_api_key
 
 os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.test_settings'
 django.setup()
diff --git a/tools/test-backend b/tools/test-backend
index 500c462d25..ef448fd2c0 100755
--- a/tools/test-backend
+++ b/tools/test-backend
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 
 from typing import List, Any
-from mypy_extensions import NoReturn
 import glob
 import argparse
 import os
diff --git a/tools/test-js-with-node b/tools/test-js-with-node
index 3b4a3af890..9bcfb2f3ce 100755
--- a/tools/test-js-with-node
+++ b/tools/test-js-with-node
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 import argparse
 import os
-import shutil
 import subprocess
 import sys
 from typing import Dict, Any
diff --git a/tools/test-locked-requirements b/tools/test-locked-requirements
index 21b80841d5..43649564c0 100755
--- a/tools/test-locked-requirements
+++ b/tools/test-locked-requirements
@@ -10,7 +10,7 @@ import sys
 import tempfile
 import ujson
 
-from typing import Optional, List, Tuple
+from typing import Optional, List
 
 TOOLS_DIR = os.path.abspath(os.path.dirname(__file__))
 ZULIP_PATH = os.path.dirname(TOOLS_DIR)
diff --git a/tools/tests/test_template_parser.py b/tools/tests/test_template_parser.py
index c464fc5071..cfbff3cd22 100644
--- a/tools/tests/test_template_parser.py
+++ b/tools/tests/test_template_parser.py
@@ -1,4 +1,4 @@
-from typing import Optional, Any
+from typing import Optional
 
 import sys
 import unittest
diff --git a/tools/update-authors-json b/tools/update-authors-json
index 387fc3f01d..1a3809fade 100755
--- a/tools/update-authors-json
+++ b/tools/update-authors-json
@@ -24,7 +24,6 @@ import json
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
 os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
 from django.conf import settings
-from zerver.lib.utils import split_by
 
 FIXTURE_FILE = os.path.join(os.path.dirname(__file__), '../zerver/tests/fixtures/authors.json')
 duplicate_commits_file = os.path.join(os.path.dirname(__file__),
diff --git a/tools/zulint/command.py b/tools/zulint/command.py
index 45a932a52d..1f871b3aa3 100644
--- a/tools/zulint/command.py
+++ b/tools/zulint/command.py
@@ -11,7 +11,7 @@ import sys
 
 if False:
     # See https://zulip.readthedocs.io/en/latest/testing/mypy.html#mypy-in-production-scripts
-    from typing import Any, Callable, Dict, List, Optional
+    from typing import Any, Callable, Dict, List
 
 from zulint.printer import print_err, colors
 
diff --git a/tools/zulint/printer.py b/tools/zulint/printer.py
index 3d55360e46..e041e950bf 100644
--- a/tools/zulint/printer.py
+++ b/tools/zulint/printer.py
@@ -2,7 +2,6 @@ from __future__ import print_function
 from __future__ import absolute_import
 
 import sys
-import os
 from itertools import cycle
 if False:
     # See https://zulip.readthedocs.io/en/latest/testing/mypy.html#mypy-in-production-scripts
diff --git a/tools/zulip-export/zulip-export b/tools/zulip-export/zulip-export
index 575a913ccb..e531354f2d 100755
--- a/tools/zulip-export/zulip-export
+++ b/tools/zulip-export/zulip-export
@@ -24,7 +24,6 @@
 import sys
 import os
 import argparse
-import time
 import json
 usage = """Export all messages on a given stream to a JSON dump.