diff --git a/tableauserverclient/config.py b/tableauserverclient/config.py
index a75112754..a0b618578 100644
--- a/tableauserverclient/config.py
+++ b/tableauserverclient/config.py
@@ -8,19 +8,24 @@
 
 
 class Config:
+    """Runtime configuration for TSC, controllable via environment variables."""
+
     # The maximum size of a file that can be published in a single request is 64MB
     @property
     def FILESIZE_LIMIT_MB(self):
+        """Maximum single-request publish size in MB (env: TSC_FILESIZE_LIMIT_MB, capped at 64)."""
         return min(int(os.getenv("TSC_FILESIZE_LIMIT_MB", 64)), 64)
 
     # For when a datasource is over 64MB, break it into 5MB(standard chunk size) chunks
     @property
     def CHUNK_SIZE_MB(self):
+        """Chunk size in MB for multipart publish requests (env: TSC_CHUNK_SIZE_MB)."""
         return int(os.getenv("TSC_CHUNK_SIZE_MB", 5 * 10))  # 5MB felt too slow, upped it to 50
 
     # Default page size
     @property
     def PAGE_SIZE(self):
+        """Default page size for paginated API requests (env: TSC_PAGE_SIZE)."""
         return int(os.getenv("TSC_PAGE_SIZE", 100))
 
 
diff --git a/tableauserverclient/datetime_helpers.py b/tableauserverclient/datetime_helpers.py
index 7beb0276e..ce5d60697 100644
--- a/tableauserverclient/datetime_helpers.py
+++ b/tableauserverclient/datetime_helpers.py
@@ -5,13 +5,14 @@
 
 
 def timestamp():
+    """Return the current local time as an HH:MM:SS string."""
     return datetime.datetime.now().strftime("%H:%M:%S")
 
 
 # This class is a concrete implementation of the abstract base class tzinfo
 # docs: https://docs.python.org/2.3/lib/datetime-tzinfo.html
 class UTC(datetime.tzinfo):
-    """UTC"""
+    """UTC timezone implementation for use with datetime objects."""
 
     def utcoffset(self, dt):
         return ZERO
@@ -28,6 +29,7 @@ def dst(self, dt):
 
 
 def parse_datetime(date):
+    """Parse a Tableau API datetime string into a UTC-aware datetime, or None if absent or unparseable."""
     if date is None:
         return None
 
@@ -38,6 +40,7 @@ def parse_datetime(date):
 
 
 def format_datetime(date):
+    """Format a datetime as a Tableau API datetime string, or None if absent."""
     if date is None:
         return None
 
diff --git a/tableauserverclient/exponential_backoff.py b/tableauserverclient/exponential_backoff.py
index 69ffdc96b..8e735d73a 100644
--- a/tableauserverclient/exponential_backoff.py
+++ b/tableauserverclient/exponential_backoff.py
@@ -7,12 +7,15 @@
 
 
 class ExponentialBackoffTimer:
+    """Timer for polling server-side events with exponential backoff between attempts."""
+
     def __init__(self, *, timeout=None):
         self.start_time = time.time()
         self.timeout = timeout
         self.current_sleep_interval = ASYNC_POLL_MIN_INTERVAL
 
     def sleep(self):
+        """Sleep for the next backoff interval, raising TimeoutError if the timeout deadline has passed."""
         max_sleep_time = ASYNC_POLL_MAX_INTERVAL
         if self.timeout is not None:
             elapsed = time.time() - self.start_time
diff --git a/tableauserverclient/filesys_helpers.py b/tableauserverclient/filesys_helpers.py
index 1663ee9e8..11d41d934 100644
--- a/tableauserverclient/filesys_helpers.py
+++ b/tableauserverclient/filesys_helpers.py
@@ -4,11 +4,13 @@
 
 
 def to_filename(string_to_sanitize):
+    """Strip characters from a string that are not safe for use in a filename."""
     sanitized = (c for c in string_to_sanitize if c.isalnum() or c in ALLOWED_SPECIAL)
     return "".join(sanitized)
 
 
 def make_download_path(filepath, filename):
+    """Resolve a download destination path from an optional target filepath and the server-provided filename."""
     download_path = None
 
     if filepath is None:
@@ -24,6 +26,7 @@ def make_download_path(filepath, filename):
 
 
 def get_file_object_size(file):
+    """Return the size in bytes of an open binary file object."""
     # Returns the size of a file object
     file.seek(0, os.SEEK_END)
     file_size = file.tell()
@@ -32,6 +35,7 @@ def get_file_object_size(file):
 
 
 def get_file_type(file):
+    """Detect the type of an open binary file by inspecting its magic bytes, returning one of 'zip', 'tde', 'xml', or 'hyper'."""
     # Tableau workbooks (twb) and data sources (tds) are both stored as xml files.
     # Packaged workbooks (twbx) and data sources (tdsx) are zip files
     # containing original files accompanied with supporting local files.
diff --git a/tableauserverclient/namespace.py b/tableauserverclient/namespace.py
index 54ac46d8d..00d6f65b9 100644
--- a/tableauserverclient/namespace.py
+++ b/tableauserverclient/namespace.py
@@ -8,10 +8,12 @@
 
 
 class UnknownNamespaceError(Exception):
-    pass
+    """Raised when an XML response contains an unrecognized Tableau API namespace."""
 
 
 class Namespace:
+    """Detects and stores the Tableau REST API XML namespace from server responses."""
+
     def __init__(self):
         self._namespace = {"t": NEW_NAMESPACE}
         self._detected = False
@@ -20,6 +22,7 @@ def __call__(self):
         return self._namespace
 
     def detect(self, xml):
+        """Detect the XML namespace from raw response bytes, updating the stored namespace on first call."""
         if self._detected:
             return