diff --git a/scripts/wk/debug.py b/scripts/wk/debug.py
index e11406c9..6b4e3445 100644
--- a/scripts/wk/debug.py
+++ b/scripts/wk/debug.py
@@ -5,6 +5,7 @@ import inspect
 import logging
 import lzma
 import os
+import pathlib
 import pickle
 import platform
 import re
@@ -12,6 +13,8 @@ import socket
 import sys
 import time
 
+from typing import Any
+
 import requests
 
 from wk.cfg.net import CRASH_SERVER
@@ -78,7 +81,7 @@ def generate_debug_report() -> str:
   return '\n'.join(report)
 
 
-def generate_object_report(obj, indent=0) -> list[str]:
+def generate_object_report(obj: Any, indent: int = 0) -> list[str]:
   """Generate debug report for obj, returns list."""
   report = []
   attr_list = []
@@ -109,7 +112,10 @@ def generate_object_report(obj, indent=0) -> list[str]:
   return report
 
 
-def save_pickles(obj_dict, out_path=None) -> None:
+def save_pickles(
+    obj_dict: dict[Any, Any],
+    out_path: pathlib.Path | str | None = None,
+    ) -> None:
   """Save dict of objects using pickle."""
   LOG.info('Saving pickles')
 
@@ -129,7 +135,11 @@ def save_pickles(obj_dict, out_path=None) -> None:
     LOG.error('Failed to save all the pickles', exc_info=True)
 
 
-def upload_debug_report(report, compress=True, reason='DEBUG') -> None:
+def upload_debug_report(
+    report: str,
+    compress: bool = True,
+    reason: str = 'DEBUG',
+    ) -> None:
   """Upload debug report to CRASH_SERVER as specified in wk.cfg.main."""
   LOG.info('Uploading debug report to %s', CRASH_SERVER.get('Name', '?'))
   headers = CRASH_SERVER.get('Headers', {'X-Requested-With': 'XMLHttpRequest'})
diff --git a/scripts/wk/exe.py b/scripts/wk/exe.py
index 167225f5..00ab62d6 100644
--- a/scripts/wk/exe.py
+++ b/scripts/wk/exe.py
@@ -4,13 +4,15 @@
 import json
 import logging
 import os
+import pathlib
 import re
 import subprocess
 import time
 
+from io import BufferedReader, TextIOWrapper
 from queue import Queue, Empty
 from threading import Thread
-from typing import Any
+from typing import Any, Callable, Iterable
 
 import psutil
 
@@ -26,11 +28,11 @@ class NonBlockingStreamReader():
   ## https://gist.github.com/EyalAr/7915597
   ## https://stackoverflow.com/a/4896288
 
-  def __init__(self, stream):
+  def __init__(self, stream: BufferedReader | TextIOWrapper):
     self.stream = stream
     self.queue = Queue()
 
-    def populate_queue(stream, queue) -> None:
+    def populate_queue(stream: BufferedReader | TextIOWrapper, queue: Queue) -> None:
       """Collect lines from stream and put them in queue."""
       while not stream.closed:
         try:
@@ -50,14 +52,14 @@ class NonBlockingStreamReader():
     """Stop reading from input stream."""
     self.stream.close()
 
-  def read(self, timeout=None) -> Any:
+  def read(self, timeout: float | int | None = None) -> Any:
     """Read from queue if possible, returns item from queue."""
     try:
       return self.queue.get(block=timeout is not None, timeout=timeout)
     except Empty:
       return None
 
-  def save_to_file(self, proc, out_path) -> None:
+  def save_to_file(self, proc: subprocess.Popen, out_path: pathlib.Path | str) -> None:
     """Continuously save output to file while proc is running."""
     LOG.debug('Saving process %s output to %s', proc, out_path)
     while proc.poll() is None:
@@ -76,7 +78,11 @@ class NonBlockingStreamReader():
 
 # Functions
 def build_cmd_kwargs(
-    cmd, minimized=False, pipe=True, shell=False, **kwargs) -> dict[str, Any]:
+    cmd: list[str],
+    minimized: bool = False,
+    pipe: bool = True,
+    shell: bool = False,
+    **kwargs) -> dict[str, Any]:
   """Build kwargs for use by subprocess functions, returns dict.
 
   Specifically subprocess.run() and subprocess.Popen().
@@ -125,7 +131,11 @@ def build_cmd_kwargs(
 
 
 def get_json_from_command(
-    cmd, check=True, encoding='utf-8', errors='ignore') -> dict[Any, Any]:
+    cmd: list[str],
+    check: bool = True,
+    encoding: str = 'utf-8',
+    errors: str = 'ignore',
+    ) -> dict[Any, Any]:
   """Capture JSON content from cmd output, returns dict.
 
   If the data can't be decoded then either an exception is raised
@@ -144,7 +154,11 @@ def get_json_from_command(
   return json_data
 
 
-def get_procs(name, exact=True, try_again=True) -> list[psutil.Process]:
+def get_procs(
+    name: str,
+    exact: bool = True,
+    try_again: bool = True,
+    ) -> list[psutil.Process]:
   """Get process object(s) based on name, returns list of proc objects."""
   LOG.debug('name: %s, exact: %s', name, exact)
   processes = []
@@ -164,7 +178,12 @@ def get_procs(name, exact=True, try_again=True) -> list[psutil.Process]:
   return processes
 
 
-def kill_procs(name, exact=True, force=False, timeout=30) -> None:
+def kill_procs(
+    name: str,
+    exact: bool = True,
+    force: bool = False,
+    timeout: float | int = 30,
+    ) -> None:
   """Kill all processes matching name (case-insensitively).
 
   NOTE: Under Posix systems this will send SIGINT to allow processes
@@ -189,7 +208,12 @@ def kill_procs(name, exact=True, force=False, timeout=30) -> None:
 
 
 def popen_program(
-    cmd, minimized=False, pipe=False, shell=False, **kwargs) -> subprocess.Popen:
+    cmd: list[str],
+    minimized: bool = False,
+    pipe: bool = False,
+    shell: bool = False,
+    **kwargs: dict[Any, Any],
+    ) -> subprocess.Popen:
   """Run program and return a subprocess.Popen object."""
   LOG.debug(
     'cmd: %s, minimized: %s, pipe: %s, shell: %s',
@@ -214,7 +238,12 @@ def popen_program(
 
 
 def run_program(
-    cmd, check=True, pipe=True, shell=False, **kwargs) -> subprocess.CompletedProcess:
+    cmd: list[str],
+    check: bool = True,
+    pipe: bool = True,
+    shell: bool = False,
+    **kwargs: dict[Any, Any],
+    ) -> subprocess.CompletedProcess:
   """Run program and return a subprocess.CompletedProcess object."""
   LOG.debug(
     'cmd: %s, check: %s, pipe: %s, shell: %s',
@@ -238,7 +267,11 @@ def run_program(
   return proc
 
 
-def start_thread(function, args=None, daemon=True) -> Thread:
+def start_thread(
+    function: Callable,
+    args: Iterable[Any] | None = None,
+    daemon: bool = True,
+    ) -> Thread:
   """Run function as thread in background, returns Thread object."""
   LOG.debug(
     'Starting background thread for function: %s, args: %s, daemon: %s',
@@ -250,7 +283,7 @@ def start_thread(function, args=None, daemon=True) -> Thread:
   return thread
 
 
-def stop_process(proc, graceful=True) -> None:
+def stop_process(proc: subprocess.Popen, graceful: bool = True) -> None:
   """Stop process.
 
   NOTES:  proc should be a subprocess.Popen obj.
@@ -272,7 +305,11 @@ def stop_process(proc, graceful=True) -> None:
     proc.kill()
 
 
-def wait_for_procs(name, exact=True, timeout=None) -> None:
+def wait_for_procs(
+    name: str,
+    exact: bool = True,
+    timeout: float | int | None = None,
+    ) -> None:
   """Wait for all process matching name."""
   LOG.debug('name: %s, exact: %s, timeout: %s', name, exact, timeout)
   target_procs = get_procs(name, exact=exact)