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fix(responses): preserve Bedrock Mantle validation errors #36580

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Merged
yassin-berriai merged 1 commit into from
Aug 21, 2026
Merged

fix(responses): preserve Bedrock Mantle validation errors #36580

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2 changes: 1 addition & 1 deletion litellm/litellm_core_utils/exception_mapping_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2308,7 +2308,7 @@ def exception_type(
exception_provider=exception_provider,
extra_information=extra_information,
)
elif custom_llm_provider == "bedrock":
elif custom_llm_provider in ("bedrock", "bedrock_mantle"):

@greptile-apps greptile-apps Bot Aug 11, 2026

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P2 Provider-specific dispatch in core

Adding bedrock_mantle here places provider-specific behavior outside the provider layer, fragmenting its error handling and increasing the maintenance cost when the Mantle adapter evolves.

Rule Used: What: Avoid writing provider-specific code outside... (source)

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

_map_bedrock_exception(
model=model,
original_exception=mappable_exception,
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23 changes: 23 additions & 0 deletions tests/test_litellm/litellm_core_utils/test_exception_mapping_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -680,3 +680,26 @@ def test_azure_404_with_invalid_request_error_type_maps_to_not_found():

assert excinfo.value.status_code == 404
assert "Response with id 'resp_abc' not found." in excinfo.value.message


def test_bedrock_mantle_400_maps_to_bad_request():
from litellm.llms.base_llm.chat.transformation import BaseLLMException

original_exception = BaseLLMException(
status_code=400,
message=(
'{"error": {"code": "validation_error", "message": '
"\"invalid request body: Invalid 'input': value did not match any expected variant\", "
'"type": "invalid_request_error"}}'
),
)

with pytest.raises(litellm.BadRequestError) as excinfo:
exception_type(
model="gpt-5.6-terra",
original_exception=original_exception,
custom_llm_provider="bedrock_mantle",
)

assert excinfo.value.status_code == 400
assert "Invalid 'input'" in excinfo.value.message
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