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feat: use reasoning field in StreamingChunk for Bedrock #2901

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Merged
julian-risch merged 1 commit into from
Mar 7, 2026
Merged

feat: use reasoning field in StreamingChunk for Bedrock #2901

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15 changes: 10 additions & 5 deletions ...azon_bedrock/src/haystack_integrations/components/generators/amazon_bedrock/chat/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -480,13 +480,15 @@ def _convert_event_to_streaming_chunk(
reasoning_content = delta["reasoningContent"]
if "redactedContent" in reasoning_content:
reasoning_content["redacted_content"] = reasoning_content.pop("redactedContent")
reasoning_text = reasoning_content.get("text", "")
streaming_chunk = StreamingChunk(
content="",
index=block_idx,
meta={
**base_meta,
"reasoning_contents": [{"index": block_idx, "reasoning_content": reasoning_content}],
},
reasoning=ReasoningContent(
reasoning_text=reasoning_text,
extra={"reasoning_contents": [{"index": block_idx, "reasoning_content": reasoning_content}]},
),
meta=base_meta,
)

elif "messageStop" in event:
Expand Down Expand Up @@ -537,7 +539,10 @@ def _process_reasoning_contents(chunks: list[StreamingChunk]) -> ReasoningConten
reasoning_signature = None
redacted_content = None
for chunk in chunks:
reasoning_contents = chunk.meta.get("reasoning_contents", [])
if chunk.reasoning and chunk.reasoning.extra:
reasoning_contents = chunk.reasoning.extra.get("reasoning_contents", [])
else:
reasoning_contents = []

for reasoning_content in reasoning_contents:
content_block_index = reasoning_content["index"]
Expand Down
6 changes: 6 additions & 0 deletions integrations/amazon_bedrock/tests/test_chat_generator_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1102,6 +1102,12 @@ def test_callback(chunk: StreamingChunk):
]
assert replies == expected_messages

# Verify streaming chunks carry reasoning in the reasoning field, not in meta
reasoning_chunks = [c for c in streaming_chunks if c.reasoning is not None]
assert len(reasoning_chunks) > 0
for chunk in reasoning_chunks:
assert "reasoning_contents" not in chunk.meta

def test_process_streaming_response_with_one_tool_call_with_redacted_thinking(self, mock_boto3_session):
model = "arn:aws:bedrock:us-east-1::inference-profile/us.anthropic.claude-sonnet-3-7-20250219-v1:0"
type_ = (
Expand Down