diff --git a/apps/api/app/dependencies.py b/apps/api/app/dependencies.py
index e0c0d57ac..4e8152928 100644
--- a/apps/api/app/dependencies.py
+++ b/apps/api/app/dependencies.py
@@ -1,4 +1,13 @@
+"""Dependency injection providers for FastAPI endpoints.
+
+All repository and service factories are defined here as FastAPI dependencies,
+ensuring proper lifecycle management and testability.
+"""
+from __future__ import annotations
+
 import redis
+from typing import Generator
+
 from app.config import settings
 from fastapi import Depends
 from sqlalchemy.orm import Session
@@ -32,15 +41,24 @@ from packages.adapters.sqlalchemy_impl.user_repository import SQLAlchemyUserRepo
 from packages.adapters.sqlalchemy_impl.workspace_invitation_repository import SQLAlchemyWorkspaceInvitationRepository
 from packages.adapters.sqlalchemy_impl.workspace_member_repository import SQLAlchemyWorkspaceMemberRepository
 from packages.adapters.sqlalchemy_impl.workspace_repository import SQLAlchemyWorkspaceRepository
+from packages.ports.asset_repository import AssetRepository
+from packages.ports.asset_library_repository import AssetLibraryRepository
 from packages.ports.user_repository import UserRepository
 from packages.ports.workspace_invitation_repository import WorkspaceInvitationRepository
 from packages.ports.workspace_member_repository import WorkspaceMemberRepository
 from packages.ports.workspace_repository import WorkspaceRepository
+from packages.ports.classification_job_repository import ClassificationJobRepository
+from packages.ports.generation_task_repository import GenerationTaskRepository
+from packages.ports.generated_video_repository import GeneratedVideoRepository
+from packages.ports.ingest_job_repository import IngestJobRepository
+from packages.ports.project_repository import ProjectRepository
+from packages.ports.project_title_repository import ProjectTitleRepository
 
 _engine, _SessionLocal = build_session_factory(settings.DATABASE_URL)
 
 
-def get_db_session():
+def get_db_session() -> Generator[Session, None, None]:
+    """Provide a database session with automatic cleanup."""
     session: Session = _SessionLocal()
     try:
         yield session
@@ -51,82 +69,96 @@ def get_db_session():
 def get_asset_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyAssetRepository:
+    """Provide the SQLAlchemy asset repository implementation."""
     return SQLAlchemyAssetRepository(session)
 
 
 def get_asset_library_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyAssetLibraryRepository:
+    """Provide the SQLAlchemy asset library repository implementation."""
     return SQLAlchemyAssetLibraryRepository(session)
 
 
 def get_ingest_job_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyIngestJobRepository:
+    """Provide the SQLAlchemy ingest job repository implementation."""
     return SQLAlchemyIngestJobRepository(session)
 
 
 def get_classification_job_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyClassificationJobRepository:
+    """Provide the SQLAlchemy classification job repository implementation."""
     return SQLAlchemyClassificationJobRepository(session)
 
 
 def get_generation_task_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyGenerationTaskRepository:
+    """Provide the SQLAlchemy generation task repository implementation."""
     return SQLAlchemyGenerationTaskRepository(session)
 
 
 def get_generated_video_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyGeneratedVideoRepository:
+    """Provide the SQLAlchemy generated video repository implementation."""
     return SQLAlchemyGeneratedVideoRepository(session)
 
 
 def get_project_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyProjectRepository:
+    """Provide the SQLAlchemy project repository implementation."""
     return SQLAlchemyProjectRepository(session)
 
 
 def get_project_title_repository(
     session: Session = Depends(get_db_session),
 ) -> SQLAlchemyProjectTitleRepository:
+    """Provide the SQLAlchemy project title repository implementation."""
     return SQLAlchemyProjectTitleRepository(session)
 
 
 def get_user_repository(
     session: Session = Depends(get_db_session),
 ) -> UserRepository:
+    """Provide the SQLAlchemy user repository implementation."""
     return SQLAlchemyUserRepository(session)
 
 
 def get_workspace_repository(
     session: Session = Depends(get_db_session),
 ) -> WorkspaceRepository:
+    """Provide the SQLAlchemy workspace repository implementation."""
     return SQLAlchemyWorkspaceRepository(session)
 
 
 def get_workspace_member_repository(
     session: Session = Depends(get_db_session),
 ) -> WorkspaceMemberRepository:
+    """Provide the SQLAlchemy workspace member repository implementation."""
     return SQLAlchemyWorkspaceMemberRepository(session)
 
 
 def get_workspace_invitation_repository(
     session: Session = Depends(get_db_session),
 ) -> WorkspaceInvitationRepository:
+    """Provide the SQLAlchemy workspace invitation repository implementation."""
     return SQLAlchemyWorkspaceInvitationRepository(session)
 
 
-def get_auth_session_store():
+def get_auth_session_store() -> SessionStore | NoopSessionStore:
+    """Provide the session store based on configuration."""
     if not settings.ENABLE_REDIS_SESSIONS:
         return NoopSessionStore()
     return SessionStore(redis_client=redis.from_url(settings.REDIS_URL, decode_responses=True))
 
 
-def get_auth_email_service():
+def get_auth_email_service() -> NoopEmailService | EmailService:
+    """Provide the email service based on configuration."""
     if not settings.ENABLE_EMAIL_DELIVERY:
         return NoopEmailService()
     return get_email_service(