diff --git a/airbyte_cdk/cli/source_declarative_manifest/_run.py b/airbyte_cdk/cli/source_declarative_manifest/_run.py
index 5def00602..3a00111f9 100644
--- a/airbyte_cdk/cli/source_declarative_manifest/_run.py
+++ b/airbyte_cdk/cli/source_declarative_manifest/_run.py
@@ -155,11 +155,25 @@ def handle_remote_manifest_command(args: list[str]) -> None:
 def create_declarative_source(
     args: list[str],
 ) -> ConcurrentDeclarativeSource:  # type: ignore [type-arg]
-    """Creates the source with the injected config.
-
-    This essentially does what other low-code sources do at build time, but at runtime,
-    with a user-provided manifest in the config. This better reflects what happens in the
-    connector builder.
+    """
+    Create a declarative source with an injected manifest configuration.
+    
+    This function dynamically creates a ConcurrentDeclarativeSource at runtime using a user-provided manifest, similar to how low-code sources are built. It validates the configuration and prepares the source for execution.
+    
+    Parameters:
+        args (list[str]): Command-line arguments containing configuration, catalog, and state information.
+    
+    Returns:
+        ConcurrentDeclarativeSource: A configured declarative source ready for sync operations.
+    
+    Raises:
+        ValueError: If the configuration is invalid or missing required manifest information.
+        Exception: For any unexpected errors during source creation, with detailed error tracing.
+    
+    Notes:
+        - Requires a configuration with an '__injected_declarative_manifest' key
+        - The manifest must be a dictionary
+        - Provides structured error reporting for configuration issues
     """
     try:
         config: Mapping[str, Any] | None
diff --git a/airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py b/airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py
index adb126b5c..400b99dc8 100644
--- a/airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py
+++ b/airbyte_cdk/sources/declarative/parsers/model_to_component_factory.py
@@ -981,11 +981,27 @@ def create_cursor_pagination(
 
     def create_custom_component(self, model: Any, config: Config, **kwargs: Any) -> Any:
         """
-        Generically creates a custom component based on the model type and a class_name reference to the custom Python class being
-        instantiated. Only the model's additional properties that match the custom class definition are passed to the constructor
-        :param model: The Pydantic model of the custom component being created
-        :param config: The custom defined connector config
-        :return: The declarative component built from the Pydantic model to be used at runtime
+        Create a custom component from a Pydantic model with dynamic class instantiation.
+        
+        This method dynamically creates a custom component by loading a class from a specified module and instantiating it with appropriate arguments. It handles complex scenarios such as nested components, type inference, and argument passing.
+        
+        Parameters:
+            model (Any): A Pydantic model representing the custom component configuration.
+            config (Config): The connector configuration used for module and component resolution.
+            **kwargs (Any): Additional keyword arguments to override or supplement model arguments.
+        
+        Returns:
+            Any: An instantiated custom component with resolved nested components and configurations.
+        
+        Raises:
+            ValueError: If the component class cannot be loaded or instantiated.
+            TypeError: If arguments do not match the component's constructor signature.
+        
+        Notes:
+            - Supports nested component creation
+            - Performs type inference for component fields
+            - Handles both dictionary and list-based component configurations
+            - Prioritizes kwargs over model arguments in case of field collisions
         """
         custom_component_class = self._get_class_from_fully_qualified_class_name(
             full_qualified_class_name=model.class_name,
@@ -1046,10 +1062,25 @@ def create_custom_component(self, model: Any, config: Config, **kwargs: Any) ->
     def _get_components_module_object(
         config: Config,
     ) -> types.ModuleType:
-        """Get a components module object based on the provided config.
-
-        If custom python components is provided, this will be loaded. Otherwise, we will
-        attempt to load from the `components` module already imported.
+        """
+        Get a components module object based on the provided configuration.
+        
+        This method dynamically creates a module for custom Python components defined in the configuration. It ensures that custom components are defined in a module named 'components' and allows runtime module creation and execution.
+        
+        Parameters:
+            config (Config): A configuration object containing the custom components definition.
+        
+        Returns:
+            types.ModuleType: A dynamically created module containing the custom components.
+        
+        Raises:
+            ValueError: If no custom components are provided or if the components are not defined in a module named 'components'.
+        
+        Notes:
+            - Uses the special key '__injected_components_py' to retrieve custom component code
+            - Creates a new module dynamically using types.ModuleType
+            - Executes the provided Python code within the new module's namespace
+            - Registers the module in sys.modules for future imports
         """
         INJECTED_COMPONENTS_PY = "__injected_components_py"
         COMPONENTS_MODULE_NAME = "components"
@@ -1073,17 +1104,24 @@ def _get_class_from_fully_qualified_class_name(
         components_module: types.ModuleType,
     ) -> Any:
         """
-        Get a class from its fully qualified name, optionally using a pre-parsed module.
-
-        Args:
-            full_qualified_class_name (str): The fully qualified name of the class (e.g., "module.ClassName").
-            components_module (Optional[ModuleType]): An optional pre-parsed module.
-
+        Retrieve a class from its fully qualified name within a predefined components module.
+        
+        Parameters:
+            full_qualified_class_name (str): The complete dot-separated path to the class (e.g., "source_declarative_manifest.components.ClassName").
+            components_module (types.ModuleType): The pre-parsed module containing custom components.
+        
         Returns:
-            Any: The class object.
-
+            Any: The requested class object.
+        
         Raises:
-            ValueError: If the class cannot be loaded.
+            ValueError: If the class cannot be loaded or does not meet module naming conventions.
+            - Raised when the module is not named "components"
+            - Raised when the full module path is not "source_declarative_manifest.components"
+            - Raised when the specific class cannot be found in the module
+        
+        Notes:
+            - Enforces strict naming conventions for custom component modules
+            - Provides detailed error messages for debugging component loading issues
         """
         split = full_qualified_class_name.split(".")
         module_name_full = ".".join(split[:-1])
@@ -1108,6 +1146,23 @@ def _get_class_from_fully_qualified_class_name(
 
     @staticmethod
     def _derive_component_type_from_type_hints(field_type: Any) -> Optional[str]:
+        """
+        Derive the component type name from type hints by unwrapping nested generic types.
+        
+        This method extracts the underlying type from potentially nested generic type hints,
+        such as List[T], Optional[List[T]], etc., and returns the type name if it's a non-builtin type.
+        
+        Parameters:
+            field_type (Any): The type hint to analyze for component type extraction.
+        
+        Returns:
+            Optional[str]: The name of the underlying type if it's a non-builtin type, otherwise None.
+        
+        Examples:
+            - List[str] returns None
+            - List[CustomType] returns "CustomType"
+            - Optional[List[CustomType]] returns "CustomType"
+        """
         interface = field_type
         while True:
             origin = get_origin(interface)
diff --git a/airbyte_cdk/test/utils/manifest_only_fixtures.py b/airbyte_cdk/test/utils/manifest_only_fixtures.py
index 43e90a2c4..643ff2327 100644
--- a/airbyte_cdk/test/utils/manifest_only_fixtures.py
+++ b/airbyte_cdk/test/utils/manifest_only_fixtures.py
@@ -31,9 +31,28 @@ def connector_dir(request: pytest.FixtureRequest) -> Path:
 
 @pytest.fixture(scope="session")
 def components_module(connector_dir: Path) -> ModuleType | None:
-    """Load and return the components module from the connector directory.
-
-    This assumes the components module is located at <connector_dir>/components.py.
+    """
+    Load and return the components module from the connector directory.
+    
+    This function attempts to load the 'components.py' module from the specified connector directory. It handles various potential failure scenarios during module loading.
+    
+    Parameters:
+        connector_dir (Path): The root directory of the connector containing the components module.
+    
+    Returns:
+        ModuleType | None: The loaded components module if successful, or None if:
+            - The components.py file does not exist
+            - The module specification cannot be created
+            - The module loader is unavailable
+    
+    Raises:
+        No explicit exceptions are raised; returns None on failure.
+    
+    Example:
+        components = components_module(Path('/path/to/connector'))
+        if components:
+            # Use the loaded module
+            some_component = components.SomeComponent()
     """
     components_path = connector_dir / "components.py"
     if not components_path.exists():
@@ -52,9 +71,25 @@ def components_module(connector_dir: Path) -> ModuleType | None:
 
 
 def components_module_from_string(components_py_text: str) -> ModuleType | None:
-    """Load and return the components module from a provided string containing the python code.
-
-    This assumes the components module is located at <connector_dir>/components.py.
+    """
+    Load a Python module from a string containing module code.
+    
+    Parameters:
+        components_py_text (str): A string containing valid Python code representing a module.
+    
+    Returns:
+        ModuleType | None: A dynamically created module object containing the executed code, or None if execution fails.
+    
+    Raises:
+        Exception: Potential runtime errors during code execution.
+    
+    Example:
+        components_code = '''
+        def sample_component():
+            return "Hello, World!"
+        '''
+        module = components_module_from_string(components_code)
+        result = module.sample_component()  # Returns "Hello, World!"
     """
     module_name = "components"
 
@@ -70,7 +105,22 @@ def components_module_from_string(components_py_text: str) -> ModuleType | None:
 
 @pytest.fixture(scope="session")
 def manifest_path(connector_dir: Path) -> Path:
-    """Return the path to the connector's manifest file."""
+    """
+    Return the path to the connector's manifest file.
+    
+    Parameters:
+        connector_dir (Path): The root directory of the connector.
+    
+    Returns:
+        Path: The absolute path to the manifest.yaml file.
+    
+    Raises:
+        FileNotFoundError: If the manifest.yaml file does not exist in the specified connector directory.
+    
+    Example:
+        manifest_file = manifest_path(Path('/path/to/connector'))
+        # Returns Path('/path/to/connector/manifest.yaml')
+    """
     path = connector_dir / "manifest.yaml"
     if not path.exists():
         raise FileNotFoundError(f"Manifest file not found at {path}")
diff --git a/unit_tests/source_declarative_manifest/conftest.py b/unit_tests/source_declarative_manifest/conftest.py
index d4c67a33e..f2a37d763 100644
--- a/unit_tests/source_declarative_manifest/conftest.py
+++ b/unit_tests/source_declarative_manifest/conftest.py
@@ -11,6 +11,23 @@
 
 
 def hash_text(input_text: str, hash_type: Literal["md5", "sha256"] = "md5") -> str:
+    """
+    Compute the hash of the input text using the specified hashing algorithm.
+    
+    Parameters:
+        input_text (str): The text to be hashed.
+        hash_type (Literal["md5", "sha256"], optional): The hashing algorithm to use. 
+            Defaults to "md5". Supports "md5" and "sha256" algorithms.
+    
+    Returns:
+        str: The hexadecimal digest of the hashed input text.
+    
+    Examples:
+        >>> hash_text("hello world")
+        '5eb63bbbe01eeed093cb22bb8f5acdc3'
+        >>> hash_text("hello world", hash_type="sha256")
+        'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9'
+    """
     hashers = {
         "md5": hashlib.md5,
         "sha256": hashlib.sha256,
@@ -21,6 +38,19 @@ def hash_text(input_text: str, hash_type: Literal["md5", "sha256"] = "md5") -> s
 
 
 def get_fixture_path(file_name) -> str:
+    """
+    Construct the full path to a fixture file relative to the current script's directory.
+    
+    Parameters:
+        file_name (str): The name of the fixture file to locate.
+    
+    Returns:
+        str: The absolute path to the specified fixture file.
+    
+    Example:
+        >>> get_fixture_path('config.json')
+        '/path/to/current/directory/config.json'
+    """
     return os.path.join(os.path.dirname(__file__), file_name)
 
 
diff --git a/unit_tests/source_declarative_manifest/resources/source_the_guardian_api/components.py b/unit_tests/source_declarative_manifest/resources/source_the_guardian_api/components.py
index db5b07971..5c8d76757 100644
--- a/unit_tests/source_declarative_manifest/resources/source_the_guardian_api/components.py
+++ b/unit_tests/source_declarative_manifest/resources/source_the_guardian_api/components.py
@@ -19,6 +19,23 @@ class CustomPageIncrement(PageIncrement):
     """
 
     def next_page_token(self, response: requests.Response, *args) -> Optional[Any]:
+        """
+        Retrieve the next page token for pagination based on the current page and total pages.
+        
+        Extracts the current page and total pages from the API response. If more pages are available,
+        increments the page counter and returns the next page number. Otherwise, returns None to
+        indicate the end of pagination.
+        
+        Parameters:
+            response (requests.Response): The HTTP response from the API containing pagination details.
+            *args: Variable length argument list (unused in this implementation).
+        
+        Returns:
+            Optional[Any]: The next page number if more pages are available, or None if pagination is complete.
+        
+        Raises:
+            KeyError: If the expected keys are missing in the response JSON.
+        """
         res = response.json().get("response")
         currPage = res.get("currentPage")
         totalPages = res.get("pages")
@@ -29,8 +46,23 @@ def next_page_token(self, response: requests.Response, *args) -> Optional[Any]:
             return None
 
     def __post_init__(self, parameters: Mapping[str, Any]):
+        """
+        Initialize the page increment with a starting page number of 1.
+        
+        This method is called after the class initialization and sets the initial page 
+        to 1 by invoking the parent class's __post_init__ method and then explicitly 
+        setting the _page attribute.
+        
+        Parameters:
+            parameters (Mapping[str, Any]): Configuration parameters passed during initialization.
+        """
         super().__post_init__(parameters)
         self._page = 1
 
     def reset(self):
+        """
+        Reset the page counter to the initial state.
+        
+        This method resets the internal page counter to 1, allowing pagination to start over from the beginning. It is useful when you want to restart the pagination process for a new request or after completing a previous pagination cycle.
+        """
         self._page = 1
diff --git a/unit_tests/source_declarative_manifest/test_source_declarative_w_custom_components.py b/unit_tests/source_declarative_manifest/test_source_declarative_w_custom_components.py
index 42880baca..607184409 100644
--- a/unit_tests/source_declarative_manifest/test_source_declarative_w_custom_components.py
+++ b/unit_tests/source_declarative_manifest/test_source_declarative_w_custom_components.py
@@ -36,11 +36,35 @@ def sample_method(self) -> str:
 
 
 def get_fixture_path(file_name) -> str:
+    """
+    Construct the absolute path to a fixture file relative to the current script's directory.
+    
+    Parameters:
+        file_name (str): The name of the fixture file to locate
+    
+    Returns:
+        str: The full absolute path to the specified fixture file
+    """
     return os.path.join(os.path.dirname(__file__), file_name)
 
 
 def test_components_module_from_string() -> None:
     # Call the function to get the module
+    """
+    Test the functionality of dynamically creating a Python module from a string containing code.
+    
+    This test verifies that the `components_module_from_string` function can successfully:
+    - Create a module from a string of Python code
+    - Define functions within the module
+    - Define classes within the module
+    - Allow instantiation and method calls on dynamically created classes
+    
+    Assertions:
+        - Checks that the returned object is a module
+        - Verifies the existence of a sample function
+        - Confirms the sample function returns the expected string
+        - Validates class definition and method invocation
+    """
     components_module: types.ModuleType = components_module_from_string(SAMPLE_COMPONENTS_PY_TEXT)
 
     # Check that the module is created and is of the correct type
@@ -60,6 +84,29 @@ def test_components_module_from_string() -> None:
 
 
 def get_py_components_config_dict() -> dict[str, Any]:
+    """
+    Construct a configuration dictionary for a declarative source with custom Python components.
+    
+    This function loads and combines configuration data from multiple YAML files and a Python components file
+    for a specific Airbyte connector. It prepares a comprehensive configuration dictionary that includes:
+    - The declarative manifest
+    - Custom Python components
+    - Checksums for the Python components
+    - Configuration and secrets from YAML files
+    
+    Parameters:
+        None
+    
+    Returns:
+        dict[str, Any]: A configuration dictionary containing:
+            - '__injected_declarative_manifest': The loaded manifest configuration
+            - '__injected_components_py': The raw Python components code
+            - '__injected_components_py_checksum': MD5 and SHA256 checksums of the components
+            - Additional configuration and secret key-value pairs from YAML files
+    
+    Raises:
+        AssertionError: If the manifest file cannot be loaded or is not a mapping
+    """
     connector_dir = Path(get_fixture_path("resources/source_the_guardian_api"))
     manifest_yml_path: Path = connector_dir / "manifest.yaml"
     custom_py_code_path: Path = connector_dir / "components.py"
@@ -91,6 +138,29 @@ def get_py_components_config_dict() -> dict[str, Any]:
     reason="Skipped due to missing 'secrets.yaml'.",
 )
 def test_given_injected_declarative_manifest_and_py_components() -> None:
+    """
+    Test the integration of a declarative source with custom Python components.
+    
+    This test function validates the end-to-end functionality of a declarative source by:
+    1. Retrieving a configuration dictionary with injected components
+    2. Modifying the start date to limit test duration
+    3. Creating a temporary configuration file
+    4. Creating a declarative source
+    5. Performing source check and discovery operations
+    6. Reading messages from the source and validating them
+    
+    The test ensures that:
+    - The configuration dictionary is correctly structured
+    - A declarative source can be created from the configuration
+    - The source can perform check and discover operations
+    - The source can read messages without errors
+    
+    Args:
+        None
+    
+    Raises:
+        AssertionError: If any of the validation checks fail during the test process
+    """
     py_components_config_dict = get_py_components_config_dict()
     # Truncate the start_date to speed up tests
     py_components_config_dict["start_date"] = (