diff --git a/cognee/tasks/storage/add_data_points.py b/cognee/tasks/storage/add_data_points.py
index 9b5c36c37..41bda954f 100644
--- a/cognee/tasks/storage/add_data_points.py
+++ b/cognee/tasks/storage/add_data_points.py
@@ -5,9 +5,18 @@ from cognee.infrastructure.databases.graph import get_graph_engine
 from cognee.modules.graph.utils import deduplicate_nodes_and_edges, get_graph_from_model
 from .index_data_points import index_data_points
 from .index_graph_edges import index_graph_edges
+from cognee.tasks.storage.exceptions import (
+    InvalidDataPointsInAddDataPointsError,
+)
 
 
 async def add_data_points(data_points: List[DataPoint]) -> List[DataPoint]:
+
+    if not isinstance(data_points, list):
+        raise InvalidDataPointsInAddDataPointsError("data_points must be a list.")
+    if not all(isinstance(dp, DataPoint) for dp in data_points):
+        raise InvalidDataPointsInAddDataPointsError("data_points: each item must be a DataPoint.")
+
     nodes = []
     edges = []
 
diff --git a/cognee/tasks/storage/exceptions/__init__.py b/cognee/tasks/storage/exceptions/__init__.py
new file mode 100644
index 000000000..33dd215d6
--- /dev/null
+++ b/cognee/tasks/storage/exceptions/__init__.py
@@ -0,0 +1,9 @@
+"""
+Custom exceptions for the Cognee API.
+
+This module defines a set of exceptions for handling various data errors
+"""
+
+from .exceptions import (
+    InvalidDataPointsInAddDataPointsError,
+)
diff --git a/cognee/tasks/storage/exceptions/exceptions.py b/cognee/tasks/storage/exceptions/exceptions.py
new file mode 100644
index 000000000..2da6a84aa
--- /dev/null
+++ b/cognee/tasks/storage/exceptions/exceptions.py
@@ -0,0 +1,13 @@
+from cognee.exceptions import (
+    CogneeValidationError,
+)
+from fastapi import status
+
+
+class InvalidDataPointsInAddDataPointsError(CogneeValidationError):
+    def __init__(self, detail: str):
+        super().__init__(
+            message=f"Invalid data_points: {detail}",
+            name="InvalidDataPointsInAddDataPointsError",
+            status_code=status.HTTP_400_BAD_REQUEST)
+
diff --git a/cognee/tasks/summarization/exceptions/__init__.py b/cognee/tasks/summarization/exceptions/__init__.py
new file mode 100644
index 000000000..502f973e7
--- /dev/null
+++ b/cognee/tasks/summarization/exceptions/__init__.py
@@ -0,0 +1,9 @@
+"""
+Custom exceptions for the Cognee API.
+
+This module defines a set of exceptions for handling various data errors
+"""
+
+from .exceptions import (
+    InvalidSummaryInputsError,
+)
diff --git a/cognee/tasks/summarization/exceptions/exceptions.py b/cognee/tasks/summarization/exceptions/exceptions.py
new file mode 100644
index 000000000..d0c9cfec6
--- /dev/null
+++ b/cognee/tasks/summarization/exceptions/exceptions.py
@@ -0,0 +1,13 @@
+from cognee.exceptions import (
+    CogneeValidationError,
+    CogneeConfigurationError,
+)
+from fastapi import status
+
+
+class InvalidSummaryInputsError(CogneeValidationError):
+    def __init__(self, detail: str):
+        super().__init__(
+            message=f"Invalid summarize_text inputs: {detail}",
+            name="InvalidSummaryInputsError",
+            status_code=status.HTTP_400_BAD_REQUEST)
\ No newline at end of file
diff --git a/cognee/tasks/summarization/summarize_text.py b/cognee/tasks/summarization/summarize_text.py
index ca6964f83..b482b5b4a 100644
--- a/cognee/tasks/summarization/summarize_text.py
+++ b/cognee/tasks/summarization/summarize_text.py
@@ -3,10 +3,11 @@ from typing import Type
 from uuid import uuid5
 from pydantic import BaseModel
 
+from cognee.tasks.summarization.exceptions import InvalidSummaryInputsError
 from cognee.modules.chunking.models.DocumentChunk import DocumentChunk
 from cognee.infrastructure.llm.LLMGateway import LLMGateway
 from cognee.modules.cognify.config import get_cognify_config
-from .models import TextSummary
+from cognee.tasks.summarization.models import TextSummary
 
 
 async def summarize_text(
@@ -35,6 +36,13 @@ async def summarize_text(
         A list of TextSummary objects, each containing the summary of a corresponding
         DocumentChunk.
     """
+
+    if not isinstance(data_chunks, list):
+        raise InvalidSummaryInputsError("data_chunks must be a list.")
+    if not all(hasattr(c, "text") for c in data_chunks):
+        raise InvalidSummaryInputsError("each DocumentChunk must have a 'text' attribute.")
+
+
     if len(data_chunks) == 0:
         return data_chunks