diff --git a/src/pytest_celery/vendors/memcached/fixtures.py b/src/pytest_celery/vendors/memcached/fixtures.py
index d471430e..2c8c5e2d 100644
--- a/src/pytest_celery/vendors/memcached/fixtures.py
+++ b/src/pytest_celery/vendors/memcached/fixtures.py
@@ -32,6 +32,14 @@ def celery_memcached_backend(default_memcached_backend: MemcachedContainer) -> M
 
 @pytest.fixture
 def default_memcached_backend_cls() -> type[MemcachedContainer]:
+    """Default Memcached backend container class. Override to apply custom
+    configuration globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[MemcachedContainer]: API for managing the vendor's container.
+    """
     return MemcachedContainer
 
 
@@ -47,14 +55,38 @@ def default_memcached_backend_cls() -> type[MemcachedContainer]:
 
 @pytest.fixture
 def default_memcached_backend_env(default_memcached_backend_cls: type[MemcachedContainer]) -> dict:
+    """Environment variables for this vendor.
+
+    Args:
+        default_memcached_backend_cls (type[MemcachedContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Items to pass to the container's environment.
+    """
     return default_memcached_backend_cls.env()
 
 
 @pytest.fixture
 def default_memcached_backend_image(default_memcached_backend_cls: type[MemcachedContainer]) -> str:
+    """Docker image for this vendor.
+
+    Args:
+        default_memcached_backend_cls (type[MemcachedContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Docker image name.
+    """
     return default_memcached_backend_cls.image()
 
 
 @pytest.fixture
 def default_memcached_backend_ports(default_memcached_backend_cls: type[MemcachedContainer]) -> dict:
+    """Port bindings for this vendor.
+
+    Args:
+        default_memcached_backend_cls (type[MemcachedContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Port bindings.
+    """
     return default_memcached_backend_cls.ports()
diff --git a/src/pytest_celery/vendors/rabbitmq/fixtures.py b/src/pytest_celery/vendors/rabbitmq/fixtures.py
index 9a3f6623..b0111ec6 100644
--- a/src/pytest_celery/vendors/rabbitmq/fixtures.py
+++ b/src/pytest_celery/vendors/rabbitmq/fixtures.py
@@ -32,6 +32,14 @@ def celery_rabbitmq_broker(default_rabbitmq_broker: RabbitMQContainer) -> Rabbit
 
 @pytest.fixture
 def default_rabbitmq_broker_cls() -> type[RabbitMQContainer]:
+    """Default RabbitMQ broker container class. Override to apply custom
+    configuration globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[RabbitMQContainer]: API for managing the vendor's container.
+    """
     return RabbitMQContainer
 
 
@@ -47,14 +55,38 @@ def default_rabbitmq_broker_cls() -> type[RabbitMQContainer]:
 
 @pytest.fixture
 def default_rabbitmq_broker_env(default_rabbitmq_broker_cls: type[RabbitMQContainer]) -> dict:
+    """Environment variables for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RabbitMQContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Items to pass to the container's environment.
+    """
     return default_rabbitmq_broker_cls.env()
 
 
 @pytest.fixture
 def default_rabbitmq_broker_image(default_rabbitmq_broker_cls: type[RabbitMQContainer]) -> str:
+    """Sets the image name for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RabbitMQContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Docker image name.
+    """
     return default_rabbitmq_broker_cls.image()
 
 
 @pytest.fixture
 def default_rabbitmq_broker_ports(default_rabbitmq_broker_cls: type[RabbitMQContainer]) -> dict:
+    """Port bindings for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RabbitMQContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Port bindings.
+    """
     return default_rabbitmq_broker_cls.ports()
diff --git a/src/pytest_celery/vendors/redis/backend/fixtures.py b/src/pytest_celery/vendors/redis/backend/fixtures.py
index d4978e23..dfacf281 100644
--- a/src/pytest_celery/vendors/redis/backend/fixtures.py
+++ b/src/pytest_celery/vendors/redis/backend/fixtures.py
@@ -32,6 +32,14 @@ def celery_redis_backend(default_redis_backend: RedisContainer) -> RedisTestBack
 
 @pytest.fixture
 def default_redis_backend_cls() -> type[RedisContainer]:
+    """Default Redis backend container class. Override to apply custom
+    configuration globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[RedisContainer]: API for managing the vendor's container.
+    """
     return RedisContainer
 
 
@@ -48,14 +56,38 @@ def default_redis_backend_cls() -> type[RedisContainer]:
 
 @pytest.fixture
 def default_redis_backend_env(default_redis_backend_cls: type[RedisContainer]) -> dict:
+    """Environment variables for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RedisContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Items to pass to the container's environment.
+    """
     return default_redis_backend_cls.env()
 
 
 @pytest.fixture
 def default_redis_backend_image(default_redis_backend_cls: type[RedisContainer]) -> str:
+    """Sets the image name for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RedisContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Docker image name.
+    """
     return default_redis_backend_cls.image()
 
 
 @pytest.fixture
 def default_redis_backend_ports(default_redis_backend_cls: type[RedisContainer]) -> dict:
+    """Port bindings for this vendor.
+
+    Args:
+        default_redis_backend_cls (type[RedisContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Port bindings.
+    """
     return default_redis_backend_cls.ports()
diff --git a/src/pytest_celery/vendors/redis/broker/fixtures.py b/src/pytest_celery/vendors/redis/broker/fixtures.py
index 9debc1e9..96d50df8 100644
--- a/src/pytest_celery/vendors/redis/broker/fixtures.py
+++ b/src/pytest_celery/vendors/redis/broker/fixtures.py
@@ -32,6 +32,14 @@ def celery_redis_broker(default_redis_broker: RedisContainer) -> RedisTestBroker
 
 @pytest.fixture
 def default_redis_broker_cls() -> type[RedisContainer]:
+    """Default Redis broker container class. Override to apply custom
+    configuration globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[RedisContainer]: API for managing the vendor's container.
+    """
     return RedisContainer
 
 
@@ -48,14 +56,38 @@ def default_redis_broker_cls() -> type[RedisContainer]:
 
 @pytest.fixture
 def default_redis_broker_env(default_redis_broker_cls: type[RedisContainer]) -> dict:
+    """Environment variables for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RedisContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Items to pass to the container's environment.
+    """
     return default_redis_broker_cls.env()
 
 
 @pytest.fixture
 def default_redis_broker_image(default_redis_broker_cls: type[RedisContainer]) -> str:
+    """Sets the image name for this vendor.
+
+    Args:
+        default_rabbitmq_broker_cls (type[RedisContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Docker image name.
+    """
     return default_redis_broker_cls.image()
 
 
 @pytest.fixture
 def default_redis_broker_ports(default_redis_broker_cls: type[RedisContainer]) -> dict:
+    """Port bindings for this vendor.
+
+    Args:
+        default_redis_broker_cls (type[RedisContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        dict: Port bindings.
+    """
     return default_redis_broker_cls.ports()
diff --git a/src/pytest_celery/vendors/worker/fixtures.py b/src/pytest_celery/vendors/worker/fixtures.py
index 4f22ede7..0fe57a8c 100644
--- a/src/pytest_celery/vendors/worker/fixtures.py
+++ b/src/pytest_celery/vendors/worker/fixtures.py
@@ -48,16 +48,39 @@ def celery_setup_worker(
 
 @pytest.fixture
 def default_worker_cls() -> type[CeleryTestWorker]:
+    """Default worker class. Override to apply custom configuration globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[CeleryTestWorker]: API for managing the vendor's node.
+    """
     return CeleryTestWorker
 
 
 @pytest.fixture
 def default_worker_container_cls() -> type[CeleryWorkerContainer]:
+    """Default worker container class. Override to apply custom configuration
+    globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[CeleryWorkerContainer]: API for managing the vendor's container.
+    """
     return CeleryWorkerContainer
 
 
 @pytest.fixture(scope="session")
 def default_worker_container_session_cls() -> type[CeleryWorkerContainer]:
+    """Default worker container session class. Override to apply custom
+    configuration globally.
+
+    See also: :ref:`vendor-class`.
+
+    Returns:
+        type[CeleryWorkerContainer]: API for managing the vendor's container.
+    """
     return CeleryWorkerContainer
 
 
@@ -88,21 +111,53 @@ def default_worker_container_session_cls() -> type[CeleryWorkerContainer]:
 
 @pytest.fixture(scope="session")
 def default_worker_celery_version(default_worker_container_session_cls: type[CeleryWorkerContainer]) -> str:
+    """Celery version for this worker.
+
+    Args:
+        default_worker_container_session_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Celery version.
+    """
     return default_worker_container_session_cls.version()
 
 
 @pytest.fixture(scope="session")
 def default_worker_celery_log_level(default_worker_container_session_cls: type[CeleryWorkerContainer]) -> str:
+    """Log level for this worker.
+
+    Args:
+        default_worker_container_session_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Log level.
+    """
     return default_worker_container_session_cls.log_level()
 
 
 @pytest.fixture(scope="session")
 def default_worker_celery_worker_name(default_worker_container_session_cls: type[CeleryWorkerContainer]) -> str:
+    """Name of the worker.
+
+    Args:
+        default_worker_container_session_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Worker name.
+    """
     return default_worker_container_session_cls.worker_name()
 
 
 @pytest.fixture(scope="session")
 def default_worker_celery_worker_queue(default_worker_container_session_cls: type[CeleryWorkerContainer]) -> str:
+    """Worker queue for this worker.
+
+    Args:
+        default_worker_container_session_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        str: Worker queue.
+    """
     return default_worker_container_session_cls.worker_queue()
 
 
@@ -111,6 +166,15 @@ def default_worker_env(
     default_worker_container_cls: type[CeleryWorkerContainer],
     celery_worker_cluster_config: dict,
 ) -> dict:
+    """Environment variables for this worker.
+
+    Args:
+        default_worker_container_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+        celery_worker_cluster_config (dict): Broker & Backend clusters configuration.
+
+    Returns:
+        dict: Items to pass to the container's environment.
+    """
     return default_worker_container_cls.env(celery_worker_cluster_config)
 
 
@@ -123,6 +187,33 @@ def default_worker_initial_content(
     default_worker_signals: set,
     default_worker_app: Celery,
 ) -> dict:
+    """Initial content for this worker's volume.
+
+    This is applied on a worker container when using the following volume configuration:
+
+    .. code-block:: python
+
+        default_worker_container = container(
+            ...
+            volumes={"{default_worker_volume.name}": DEFAULT_WORKER_VOLUME},
+            ...
+        )
+
+    .. note::
+
+        Move volumes may be added additionally.
+
+    Args:
+        default_worker_container_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+        default_worker_app_module (ModuleType): App module to inject.
+        default_worker_utils_module (ModuleType): Utils module to inject.
+        default_worker_tasks (set): Tasks modules to inject.
+        default_worker_signals (set): Signals modules to inject.
+        default_worker_app (Celery): Celery app to initialize the worker with.
+
+    Returns:
+        dict: Initial volume content (dict of files).
+    """
     return default_worker_container_cls.initial_content(
         app_module=default_worker_app_module,
         utils_module=default_worker_utils_module,
@@ -134,24 +225,64 @@ def default_worker_initial_content(
 
 @pytest.fixture
 def default_worker_app_module(default_worker_container_cls: type[CeleryWorkerContainer]) -> ModuleType:
+    """App module for this worker.
+
+    Args:
+        default_worker_container_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        ModuleType: App module.
+    """
     return default_worker_container_cls.app_module()
 
 
 @pytest.fixture
 def default_worker_utils_module(default_worker_container_cls: type[CeleryWorkerContainer]) -> ModuleType:
+    """Utils module for this worker.
+
+    Args:
+        default_worker_container_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        ModuleType: Utils module.
+    """
     return default_worker_container_cls.utils_module()
 
 
 @pytest.fixture
 def default_worker_tasks(default_worker_container_cls: type[CeleryWorkerContainer]) -> set:
+    """Tasks modules set for this worker.
+
+    Args:
+        default_worker_container_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        set: Tasks modules.
+    """
     return default_worker_container_cls.tasks_modules()
 
 
 @pytest.fixture
 def default_worker_signals(default_worker_container_cls: type[CeleryWorkerContainer]) -> set:
+    """Signals modules set for this worker.
+
+    Args:
+        default_worker_container_cls (type[CeleryWorkerContainer]): See also: :ref:`vendor-class`.
+
+    Returns:
+        set: Signals modules.
+    """
     return default_worker_container_cls.signals_modules()
 
 
 @pytest.fixture
 def default_worker_app(celery_setup_app: Celery) -> Celery:
+    """Celery app instance for this worker.
+
+    Args:
+        celery_setup_app (Celery): See also: :ref:`vendor-class`.
+
+    Returns:
+        Celery: Celery app instance.
+    """
     return celery_setup_app