From 7f1e98c7fb4b9daf5d50f58f3d9d7228737b8654 Mon Sep 17 00:00:00 2001
From: Mason Daugherty <github@mdrxy.com>
Date: Thu, 31 Jul 2025 11:19:01 -0400
Subject: [PATCH] fix: add index to InvalidToolCall

---
 libs/core/langchain_core/messages/content_blocks.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/core/langchain_core/messages/content_blocks.py b/libs/core/langchain_core/messages/content_blocks.py
index 38d05cced75..fedf4d92043 100644
--- a/libs/core/langchain_core/messages/content_blocks.py
+++ b/libs/core/langchain_core/messages/content_blocks.py
@@ -361,6 +361,9 @@ class InvalidToolCall(TypedDict):
     error: Optional[str]
     """An error message associated with the tool call."""
 
+    index: NotRequired[int]
+    """Index of block in aggregate response. Used during streaming."""
+
     extras: NotRequired[dict[str, Any]]
     """Provider-specific metadata."""