From 0f7003a2aeb84651230b0fcbcb8403e4ed957af8 Mon Sep 17 00:00:00 2001
From: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
Date: Fri, 6 Nov 2026 19:12:13 -0800
Subject: [PATCH] fix(ollama): keep replayed tool arguments out of a rejected
 replay's error chain

---
 litellm/llms/ollama/chat/transformation.py             |  6 +++---
 .../llms/ollama/test_ollama_chat_transformation.py     | 10 +++++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/litellm/llms/ollama/chat/transformation.py b/litellm/llms/ollama/chat/transformation.py
index ee795d2f49c..1e3e6186dd1 100644
--- a/litellm/llms/ollama/chat/transformation.py
+++ b/litellm/llms/ollama/chat/transformation.py
@@ -55,18 +55,18 @@ def _to_ollama_tool_call_function(model: str, tool_call: ChatCompletionAssistant
     name: Final = function.get("name") or ""
     raw_arguments: Final[object] = function.get("arguments")
     try:
-        parsed: Final = (
+        parsed: Final[object] = (
             parse_tool_call_arguments(raw_arguments, tool_name=name, context="Ollama chat request")
             if isinstance(raw_arguments, str) or raw_arguments is None
             else raw_arguments
         )
         arguments: Final = _TOOL_CALL_ARGUMENTS.validate_python({} if parsed is None else parsed)
-    except ValueError as e:
+    except ValueError:
         raise litellm.BadRequestError(
             message=f"OllamaException - arguments of assistant tool call {tool_call.get('id')!r} are not a JSON object",
             model=model,
             llm_provider="ollama_chat",
-        ) from e
+        ) from None
     return OllamaToolCallFunction(name=name, arguments=arguments)
 
 
diff --git a/tests/unit/llms/ollama/test_ollama_chat_transformation.py b/tests/unit/llms/ollama/test_ollama_chat_transformation.py
index acd52987144..36df47deaab 100644
--- a/tests/unit/llms/ollama/test_ollama_chat_transformation.py
+++ b/tests/unit/llms/ollama/test_ollama_chat_transformation.py
@@ -4,6 +4,7 @@ import itertools
 import logging
 import os
 import sys
+import traceback
 from typing import Final, cast
 
 import pytest
@@ -1099,10 +1100,12 @@ class TestOllamaToolCallTransformation:
 
     @pytest.mark.parametrize(
         "arguments",
-        ['{"path": "a.rs"}{"path": "b.rs"}', '["a.rs", "b.rs"]', '[["path", "a.rs"]]'],
-        ids=["glued", "array", "pairs"],
+        ['{"path": "a.rs"}{"path": "b.rs"}', '["a.rs", "b.rs"]', '[["path", "a.rs"]]', "[]"],
+        ids=["glued", "array", "pairs", "empty_array"],
     )
-    def test_replayed_tool_call_arguments_that_are_not_an_object_answer_400(self, arguments: str):
+    def test_replayed_tool_call_arguments_that_are_not_an_object_answer_400_without_echoing_them(
+        self, arguments: str
+    ):
         with pytest.raises(litellm.BadRequestError) as exc_info:
             litellm.completion(
                 model="ollama_chat/qwen3:8b",
@@ -1112,6 +1115,7 @@ class TestOllamaToolCallTransformation:
 
         assert exc_info.value.status_code == 400
         assert "call_abc123" in str(exc_info.value)
+        assert "a.rs" not in "".join(traceback.format_exception(exc_info.value))
 
 
 class TestOllamaStreamingParallelToolCallIndex: