diff --git a/src/crewai/utilities/embedding_configurator.py b/src/crewai/utilities/embedding_configurator.py
index 8596ecd58..985fd9339 100644
--- a/src/crewai/utilities/embedding_configurator.py
+++ b/src/crewai/utilities/embedding_configurator.py
@@ -1,27 +1,27 @@
 import os
-from typing import Any, Dict, Optional, cast, Protocol, TypeVar, Sequence
+from typing import Any, Dict, Optional, cast, Protocol, Sequence, TYPE_CHECKING, TypeVar, List, Union
 
 from crewai.utilities.errors import ChromaDBRequiredError
 
-T = TypeVar('T')
+if TYPE_CHECKING:
+    from numpy import ndarray
+    from numpy import dtype, floating, signedinteger, unsignedinteger
 
 try:
-    from chromadb import Documents, EmbeddingFunction as ChromaEmbeddingFunction, Embeddings
+    from chromadb import Documents, EmbeddingFunction, Embeddings
     from chromadb.api.types import validate_embedding_function
     HAS_CHROMADB = True
-    
-    EmbeddingFunction = ChromaEmbeddingFunction
 except ImportError:
     HAS_CHROMADB = False
     
-    class EmbeddingFunction(Protocol[T]):
-        """Protocol for embedding functions when ChromaDB is not available."""
-        def __call__(self, input: Sequence[str]) -> Sequence[Sequence[float]]: ...
-        
-    Documents = Any
-    Embeddings = Any
+    Documents = List[str]  # type: ignore
+    Embeddings = List[List[float]]  # type: ignore
     
-    def validate_embedding_function(func: Any) -> None:
+    class EmbeddingFunction(Protocol):  # type: ignore
+        """Protocol for embedding functions when ChromaDB is not available."""
+        def __call__(self, input: List[str]) -> List[List[float]]: ...
+    
+    def validate_embedding_function(func: Any) -> None:  # type: ignore
         """Stub for validate_embedding_function when ChromaDB is not available."""
         pass
 
@@ -266,7 +266,7 @@ class EmbeddingConfigurator:
                 "IBM Watson dependencies are not installed. Please install them to use Watson embedding."
             ) from e
 
-        class WatsonEmbeddingFunction(EmbeddingFunction):
+        class WatsonEmbeddingFunction:
             def __call__(self, input: Documents) -> Embeddings:
                 if isinstance(input, str):
                     input = [input]
diff --git a/src/crewai/utilities/errors/__init__.py b/src/crewai/utilities/errors/__init__.py
index 5ffb32421..e4277aef2 100644
--- a/src/crewai/utilities/errors/__init__.py
+++ b/src/crewai/utilities/errors/__init__.py
@@ -1,5 +1,8 @@
 """Custom error classes for CrewAI."""
 
+from typing import Optional
+
+
 class ChromaDBRequiredError(ImportError):
     """Error raised when ChromaDB is required but not installed."""
     
@@ -14,3 +17,46 @@ class ChromaDBRequiredError(ImportError):
             "Please install it with 'pip install crewai[storage]'"
         )
         super().__init__(message)
+
+
+class DatabaseOperationError(Exception):
+    """Base exception class for database operation errors."""
+
+    def __init__(self, message: str, original_error: Optional[Exception] = None):
+        """Initialize the database operation error.
+
+        Args:
+            message: The error message to display
+            original_error: The original exception that caused this error, if any
+        """
+        super().__init__(message)
+        self.original_error = original_error
+
+
+class DatabaseError:
+    """Standardized error message templates for database operations."""
+
+    INIT_ERROR: str = "Database initialization error: {}"
+    SAVE_ERROR: str = "Error saving task outputs: {}"
+    UPDATE_ERROR: str = "Error updating task outputs: {}"
+    LOAD_ERROR: str = "Error loading task outputs: {}"
+    DELETE_ERROR: str = "Error deleting task outputs: {}"
+
+    @classmethod
+    def format_error(cls, template: str, error: Exception) -> str:
+        """Format an error message with the given template and error.
+
+        Args:
+            template: The error message template to use
+            error: The exception to format into the template
+
+        Returns:
+            The formatted error message
+        """
+        return template.format(str(error))
+
+
+class AgentRepositoryError(Exception):
+    """Exception raised when an agent repository is not found."""
+
+    ...
diff --git a/tests/test_optional_dependencies.py b/tests/test_optional_dependencies.py
index 8d8156925..1377fb185 100644
--- a/tests/test_optional_dependencies.py
+++ b/tests/test_optional_dependencies.py
@@ -3,6 +3,8 @@ import importlib
 import sys
 from unittest.mock import patch
 
+from crewai.utilities.errors import ChromaDBRequiredError
+
 
 def test_import_without_chromadb():
     """Test that crewai can be imported without chromadb."""
@@ -31,7 +33,7 @@ def test_memory_storage_without_chromadb():
         
         assert not HAS_CHROMADB
         
-        with pytest.raises(ImportError) as excinfo:
+        with pytest.raises(ChromaDBRequiredError) as excinfo:
             storage = RAGStorage()
             storage._initialize_app()
             
@@ -48,7 +50,7 @@ def test_knowledge_storage_without_chromadb():
         
         assert not HAS_CHROMADB
         
-        with pytest.raises(ImportError) as excinfo:
+        with pytest.raises(ChromaDBRequiredError) as excinfo:
             storage = KnowledgeStorage()
             storage.initialize_knowledge_storage()
             
@@ -65,7 +67,7 @@ def test_embedding_configurator_without_chromadb():
         
         assert not HAS_CHROMADB
         
-        with pytest.raises(ImportError) as excinfo:
+        with pytest.raises(ChromaDBRequiredError) as excinfo:
             configurator = EmbeddingConfigurator()
             configurator.configure_embedder()