From 3c591f0379a6aa23e7a1a19fd912793426246d2f Mon Sep 17 00:00:00 2001
From: BillionClaw <267901332+BillionClaw@users.noreply.github.com>
Date: Tue, 24 Mar 2026 07:37:17 +0800
Subject: [PATCH] fix(anthropic): handle tool_choice type 'none' in messages
 API

---
 .../experimental_pass_through/adapters/transformation.py        | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py b/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
index ed49943b7fe..7d0677e5732 100644
--- a/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
+++ b/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
@@ -776,6 +776,8 @@ class LiteLLMAnthropicMessagesAdapter:
             return ChatCompletionToolChoiceObjectParam(
                 type="function", function=tc_function_param
             )
+        elif tool_choice["type"] == "none":
+            return "none"
         else:
             raise ValueError(
                 "Incompatible tool choice param submitted - {}".format(tool_choice)