diff --git a/autogpt_platform/backend/backend/api/features/library/db.py b/autogpt_platform/backend/backend/api/features/library/db.py
index 3794b6eba5..c614573ab1 100644
--- a/autogpt_platform/backend/backend/api/features/library/db.py
+++ b/autogpt_platform/backend/backend/api/features/library/db.py
@@ -390,6 +390,20 @@ async def get_library_agent_by_graph_id(
     graph_id: str,
     graph_version: Optional[int] = None,
 ) -> library_model.LibraryAgent | None:
+    """
+    Retrieves a library agent by its graph ID for a given user.
+
+    Args:
+        user_id: The ID of the user who owns the library agent.
+        graph_id: The ID of the agent graph to look up.
+        graph_version: Optional specific version of the graph to retrieve.
+
+    Returns:
+        The LibraryAgent if found, otherwise None.
+
+    Raises:
+        DatabaseError: If there's an error during retrieval.
+    """
     try:
         filter: prisma.types.LibraryAgentWhereInput = {
             "agentGraphId": graph_id,
@@ -673,6 +687,17 @@ async def update_library_agent(
 async def delete_library_agent(
     library_agent_id: str, user_id: str, soft_delete: bool = True
 ) -> None:
+    """
+    Deletes a library agent and cleans up associated schedules and webhooks.
+
+    Args:
+        library_agent_id: The ID of the library agent to delete.
+        user_id: The ID of the user who owns the library agent.
+        soft_delete: If True, marks the agent as deleted; if False, permanently removes it.
+
+    Raises:
+        NotFoundError: If the library agent is not found or doesn't belong to the user.
+    """
     # First get the agent to find the graph_id for cleanup
     library_agent = await prisma.models.LibraryAgent.prisma().find_unique(
         where={"id": library_agent_id}, include={"AgentGraph": True}
@@ -1166,6 +1191,20 @@ async def update_preset(
 async def set_preset_webhook(
     user_id: str, preset_id: str, webhook_id: str | None
 ) -> library_model.LibraryAgentPreset:
+    """
+    Sets or removes a webhook connection for a preset.
+
+    Args:
+        user_id: The ID of the user who owns the preset.
+        preset_id: The ID of the preset to update.
+        webhook_id: The ID of the webhook to connect, or None to disconnect.
+
+    Returns:
+        The updated LibraryAgentPreset.
+
+    Raises:
+        NotFoundError: If the preset is not found or doesn't belong to the user.
+    """
     current = await prisma.models.AgentPreset.prisma().find_unique(
         where={"id": preset_id},
         include=AGENT_PRESET_INCLUDE,
diff --git a/autogpt_platform/backend/backend/api/features/library/routes_test.py b/autogpt_platform/backend/backend/api/features/library/routes_test.py
index 4d83812891..5ea388972e 100644
--- a/autogpt_platform/backend/backend/api/features/library/routes_test.py
+++ b/autogpt_platform/backend/backend/api/features/library/routes_test.py
@@ -112,7 +112,7 @@ async def test_get_library_agents_success(
     mock_db_call.assert_called_once_with(
         user_id=test_user_id,
         search_term="test",
-        sort_by=library_model.LibraryAgentSort.UPDATED_AT,
+        sort_by=library_model.LibraryAgentSort.LAST_EXECUTED,
         page=1,
         page_size=15,
     )
diff --git a/autogpt_platform/frontend/src/app/api/openapi.json b/autogpt_platform/frontend/src/app/api/openapi.json
index aa4c49b1a2..d003b1f7d6 100644
--- a/autogpt_platform/frontend/src/app/api/openapi.json
+++ b/autogpt_platform/frontend/src/app/api/openapi.json
@@ -3361,7 +3361,7 @@
             "schema": {
               "$ref": "#/components/schemas/LibraryAgentSort",
               "description": "Criteria to sort results by",
-              "default": "updatedAt"
+              "default": "lastExecuted"
             },
             "description": "Criteria to sort results by"
           },
@@ -8239,7 +8239,7 @@
       },
       "LibraryAgentSort": {
         "type": "string",
-        "enum": ["createdAt", "updatedAt"],
+        "enum": ["createdAt", "updatedAt", "lastExecuted"],
         "title": "LibraryAgentSort",
         "description": "Possible sort options for sorting library agents."
       },