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fix(bedrock): ensure toolUse.input is always a dict when converting from OpenAI format (#18414)

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When some providers (like OpenRouter) return tool call arguments as '""'
(a JSON-encoded empty string), json.loads returns an empty string instead
of a dict. Since Bedrock requires toolUse.input to be a JSON object, this
causes a BedrockException.

This fix adds a type check after json.loads() to ensure the result is
always a dictionary.

Co-authored-by: Krish Dholakia <krrishdholakia@gmail.com>
This commit is contained in:
LouisShark
2026-01-08 00:54:46 +05:30
committed by GitHub
co-authored by Krish Dholakia
parent f126f75995
commit ea8a94988f
1 changed files with 5 additions and 0 deletions
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litellm/litellm_core_utils/prompt_templates/factory.py
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@@ -3176,6 +3176,11 @@ def _convert_to_bedrock_tool_call_invoke(
id = tool["id"]
name = tool["function"].get("name", "")
arguments = tool["function"].get("arguments", "")
arguments_dict = json.loads(arguments) if arguments else {}
# Ensure arguments_dict is always a dict (Bedrock requires toolUse.input to be an object)
# When some providers return arguments: '""' (JSON-encoded empty string), json.loads returns ""
if not isinstance(arguments_dict, dict):
arguments_dict = {}
if not arguments or not arguments.strip():
arguments_dict = {}
else: