From d2d6e6f22a850ac9b156ca1aab31bfe7775633da Mon Sep 17 00:00:00 2001
From: Joseph Barker <joseph.barker@rubrik.com>
Date: Tue, 7 Apr 2026 13:39:32 -0700
Subject: [PATCH] Add fallback message when blocking service returns empty
 explanation

Prevents whitespace-only violation message when the tool blocking
service blocks tools but returns an empty content field.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 litellm/integrations/rubrik.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/litellm/integrations/rubrik.py b/litellm/integrations/rubrik.py
index ae525f6b1ee..e901ec5fbb7 100644
--- a/litellm/integrations/rubrik.py
+++ b/litellm/integrations/rubrik.py
@@ -453,7 +453,8 @@ class RubrikLogger(CustomGuardrail, CustomBatchLogger):
         if len(allowed_tools) == len(all_tool_calls):
             return None
 
+        explanation = blocking_explanation or "Tool call blocked by policy."
         return BlockedToolsResult(
             allowed_tools=allowed_tools,
-            explanation=f"\n\n{blocking_explanation}",
+            explanation=f"\n\n{explanation}",
         )