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fix: keep is_error from Anthropic tool_result in /v1/messages translation

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Mrunmayee Daware 2026-10-07 17:46:22 +05:30 • committed by GitHub
parent cb138ba92f
commit 6ff5a9f76c
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1 changed files with 18 additions and 1 deletions
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19
litellm/llms/anthropic/pass_through/adapters/transformation.py
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@ -525,10 +525,13 @@ class LiteLLMAnthropicMessagesAdapter:
self._add_cache_control_if_applicable(content, doc_obj, model)
new_user_content_list.append(doc_obj)
elif content.get("type") == "tool_result":
tool_result_content = self._tool_result_content(content.get("content"))
if content.get("is_error"):
tool_result_content = self._mark_tool_result_as_error(tool_result_content)
tool_result = ChatCompletionToolMessage(
role="tool",
tool_call_id=content.get("tool_use_id", ""),
content=self._tool_result_content(content.get("content")),
content=tool_result_content,
)
self._add_cache_control_if_applicable(content, tool_result, model)
tool_message_list.append(tool_result)
@ -1317,6 +1320,20 @@ class LiteLLMAnthropicMessagesAdapter:
case _:
return list(parts)
@staticmethod
def _mark_tool_result_as_error(content: ToolResultContent) -> ToolResultContent:
"""Keep Anthropic's `is_error` signal visible.
Chat Completions tool messages have no error field, so encode the
flag into the content itself; models and downstream provider
mappings can then still tell the tool call failed.
"""
if isinstance(content, str):
return "[tool error] " + content if content else "[tool error]"
if isinstance(content, list):
return [ChatCompletionTextObject(type="text", text="[tool error] "), *content]
return content
def _tool_result_part(self, item: object) -> ToolMessageContentPart | None:
if isinstance(item, str):
return ChatCompletionTextObject(type="text", text=item)