From f976a01fcef5b451e725febe4ff1ddaca2ef1f89 Mon Sep 17 00:00:00 2001
From: Ryan Crabbe <rcrabbe@berkeley.edu>
Date: Sat, 21 Feb 2026 11:34:30 -0800
Subject: [PATCH] fix: use precise tuple[str, str] type annotation for
 _PRESERVED_NONE_FIELDS

---
 litellm/proxy/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/proxy/utils.py b/litellm/proxy/utils.py
index 0ad081a107..9243fb7f58 100644
--- a/litellm/proxy/utils.py
+++ b/litellm/proxy/utils.py
@@ -4565,7 +4565,7 @@ def validate_model_access(
             )
 
 
-_PRESERVED_NONE_FIELDS: List[tuple] = [
+_PRESERVED_NONE_FIELDS: List[tuple[str, str]] = [
     ("message", "content"),  # null when tool_calls present (issue #6677)
     ("message", "role"),  # always required by OpenAI spec
     ("delta", "content"),  # null in streaming chunks