diff --git a/components/renku_data_services/notebooks/api.spec.yaml b/components/renku_data_services/notebooks/api.spec.yaml
index cf11d5cc5..b8c7f6189 100644
--- a/components/renku_data_services/notebooks/api.spec.yaml
+++ b/components/renku_data_services/notebooks/api.spec.yaml
@@ -21,9 +21,16 @@ paths:
             minLength: 1
         responses:
           '200':
-            description: The Docker image is available.
-          '404':
-            description: The Docker image is not available.
+            content:
+              application/json:
+                schema:
+                  "$ref": "#/components/schemas/ImageCheckResponse"
+          '422':
+            content:
+              application/json:
+                schema:
+                  "$ref": "#/components/schemas/ErrorResponse"
+            description: The image url is malformed.
         tags:
         - notebooks
   "/notebooks/logs/{server_name}":
@@ -355,27 +362,28 @@ paths:
       tags:
         - sessions
   "/sessions/images":
-    get:
-      summary: Check if a session image exists
-      parameters:
-      - description: The Docker image URL (tag included) that should be fetched.
-        in: query
-        name: image_url
-        required: true
-        schema:
-          type: string
-          minLength: 1
-      responses:
-        "200":
-          description: The docker image can be found
-        "404":
-          description: The docker image cannot be found or the user does not have permissions to access it
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/ErrorResponse"
-        default:
-          $ref: "#/components/responses/Error"
+      get:
+        description: Check if a session image exists
+        parameters:
+        - description: The Docker image URL (tag included) that should be fetched.
+          in: query
+          name: image_url
+          required: true
+          schema:
+            type: string
+            minLength: 1
+        responses:
+          '200':
+            content:
+              application/json:
+                schema:
+                  "$ref": "#/components/schemas/ImageCheckResponse"
+          '422':
+            content:
+              application/json:
+                schema:
+                  "$ref": "#/components/schemas/ErrorResponse"
+            description: The image url is malformed.
       tags:
         - sessions
 components:
@@ -1036,7 +1044,37 @@ components:
       maxLength: 50
       pattern: '^[a-z]([-a-z0-9]*[a-z0-9])?$'
       example: d185e68d-d43-renku-2-b9ac279a4e8a85ac28d08
+    ImageCheckResponse:
+      type: object
+      properties:
+        accessible:
+          type: boolean
+          description: Whether the image is accessible or not.
+        connection:
+          allOf:
+            - "$ref": "#/components/schemas/ImageConnectionStatus"
+            - description: Whether an oauth2 connection is or can be used to access the image. If null indicates that there is no oauth2 connection we can use to access the requested image.
+      required:
+        - accessible
+    ImageConnection:
+      type: object
+      properties:
+        id:
+          type: string
+        status:
+          "$ref": "#/components/schemas/ImageConnectionStatus"
+      required:
+        - id
+        - status
+    ImageConnectionStatus:
+      type: string
+      enum:
+        - connected
+        - pending
+        - disconnected
   responses:
+    ImageCheckResponse:
+      description: Information about whether a docker image is available or not and if there is a connected service then which connected service can be used to access the image.
     Error:
       description: The schema for all 4xx and 5xx responses
       content:
diff --git a/components/renku_data_services/notebooks/apispec.py b/components/renku_data_services/notebooks/apispec.py
index 8f5673816..4cbb9a363 100644
--- a/components/renku_data_services/notebooks/apispec.py
+++ b/components/renku_data_services/notebooks/apispec.py
@@ -1,6 +1,6 @@
 # generated by datamodel-codegen:
 #   filename:  api.spec.yaml
-#   timestamp: 2025-04-17T14:26:28+00:00
+#   timestamp: 2025-08-26T12:05:22+00:00
 
 from __future__ import annotations
 
@@ -281,6 +281,12 @@ class SessionCloudStoragePost(BaseAPISpec):
     )
 
 
+class ImageConnectionStatus(Enum):
+    connected = "connected"
+    pending = "pending"
+    disconnected = "disconnected"
+
+
 class NotebooksImagesGetParametersQuery(BaseAPISpec):
     image_url: str = Field(..., min_length=1)
 
@@ -356,6 +362,16 @@ class SessionResources(BaseAPISpec):
     requests: Optional[SessionResourcesRequests] = None
 
 
+class ImageCheckResponse(BaseAPISpec):
+    accessible: bool = Field(..., description="Whether the image is accessible or not.")
+    connection: Optional[ImageConnectionStatus] = None
+
+
+class ImageConnection(BaseAPISpec):
+    id: str
+    status: ImageConnectionStatus
+
+
 class NotebookResponse(BaseAPISpec):
     annotations: Optional[FieldUserPodAnnotations] = None
     cloudstorage: Optional[List[LaunchNotebookResponseCloudStorage]] = None