diff --git a/miraheze/puppet/upgrade-cp-service.py b/miraheze/puppet/upgrade-cp-service.py
index 531be0b..f371660 100644
--- a/miraheze/puppet/upgrade-cp-service.py
+++ b/miraheze/puppet/upgrade-cp-service.py
@@ -46,6 +46,13 @@ class EnvironmentList(TypedDict):
 
 class ServersAction(argparse.Action):
     def __call__(self, parser, namespace, values, option_string=None):  # noqa: U100
+        """
+        Parse and validate server choices from a comma-separated input string.
+        
+        Splits the input into individual server names and verifies each against the current
+        environment's valid servers. If the keyword "all" is present, it replaces the list with
+        all available servers. Triggers a parser error if any invalid server names are found.
+        """
         input_servers = values.split(',')
         valid_servers = get_environment_info()['servers']
         if 'all' in input_servers:
@@ -56,7 +63,20 @@ def __call__(self, parser, namespace, values, option_string=None):  # noqa: U100
         setattr(namespace, self.dest, input_servers)
 
 def run_command(command):
-    """Runs a shell command and returns the output."""
+    """
+    Executes a shell command and returns its output.
+    
+    This function runs the given command in a subshell using the subprocess module.
+    It captures the command's standard output and returns it after stripping any
+    extraneous whitespace. If the command fails, it prints an error message and
+    returns None.
+    
+    Args:
+        command (str): The shell command to execute.
+    
+    Returns:
+        str or None: The command's output if successful; otherwise, None.
+    """
     try:
         result = subprocess.run(command, shell=True, check=True, capture_output=True, text=True)
         return result.stdout.strip()
@@ -65,7 +85,21 @@ def run_command(command):
         return None
 
 def wait_for_ping(server, timeout=300, interval=5):
-    """Waits for the server to respond to ping."""
+    """
+    Waits for a server to become reachable via ping.
+    
+    Repeatedly pings the specified server at regular intervals until it responds or the timeout is reached.
+    Prints status messages indicating whether the server has come back online, and returns a boolean
+    value signifying the server's availability.
+    
+    Args:
+        server: The address or hostname of the server to ping.
+        timeout: The maximum time in seconds to wait for a response (default is 300).
+        interval: The interval in seconds between consecutive ping attempts (default is 5).
+    
+    Returns:
+        True if the server responds within the timeout period, otherwise False.
+    """
     print(f"Waiting for {server} to come back online...")
     start_time = time.time()
     while time.time() - start_time < timeout:
@@ -78,6 +112,25 @@ def wait_for_ping(server, timeout=300, interval=5):
     return False
 
 def check_up(Debug: str, domain: str = 'meta.miraheze.org', verify: bool = True) -> bool:
+    """
+    Checks whether the target service is operational by querying its MediaWiki API.
+    
+    This function sends a GET request over HTTPS to the API endpoint at the given domain.
+    If a debug identifier is provided, it attaches custom headers and verifies that the
+    response header includes the expected debug context. The service is considered up if the
+    response has a 200 status code, contains the 'miraheze' marker in its body, and, when
+    debugging is active, the debug identifier is present in the 'X-Served-By' header.
+    SSL verification is controlled by the verify flag (with warnings suppressed when disabled).
+    Diagnostic messages are printed if the service does not meet these checks.
+    
+    Parameters:
+        Debug: A debug identifier used to insert and validate custom headers.
+        domain: The service domain to query (default "meta.miraheze.org").
+        verify: Flag to enforce SSL certificate verification (default True).
+    
+    Returns:
+        True if the service is healthy; otherwise, False.
+    """
     if verify is False:
         os.environ['PYTHONWARNINGS'] = 'ignore:Unverified HTTPS request'
 
@@ -105,7 +158,18 @@ def check_up(Debug: str, domain: str = 'meta.miraheze.org', verify: bool = True)
     return up
 
 def process_server(server):
-    """Performs the sequence of commands for a given server."""
+    """
+    Processes the upgrade workflow for the specified server.
+    
+    This function orchestrates the server upgrade steps by marking the backend as sick,
+    upgrading packages, rebooting the server, and then verifying that the server is back online.
+    If the server responds to a ping, it conducts a health check and, if successful, restores
+    the backend health to auto. If the health check fails or the server does not respond to ping,
+    the function pauses until the user confirms to continue.
+    
+    Parameters:
+        server: The hostname or identifier of the server to process.
+    """
     print(f"Processing {server}...")
     
     # Mark backend as sick
@@ -138,4 +202,4 @@ def process_server(server):
     parser.add_argument('--servers', dest='servers', action=ServersAction, required=True, help='server(s) to deploy to')
     args = parser.parse_args()
     for server in args.servers:
-        process_server(server)
+        process_server(args.servers)