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fix(mistral): report usage metrics in streaming mode #1697

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fix(mistral): report usage metrics in streaming mode #1697

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4 changes: 2 additions & 2 deletions src/strands/models/mistral.py
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Original file line number Diff line number Diff line change
Expand Up @@ -496,8 +496,8 @@ async def stream(

yield self.format_chunk({"chunk_type": "message_stop", "data": choice.finish_reason})

if hasattr(chunk, "usage"):
yield self.format_chunk({"chunk_type": "metadata", "data": chunk.usage})
if hasattr(chunk, "data") and hasattr(chunk.data, "usage") and chunk.data.usage:
yield self.format_chunk({"chunk_type": "metadata", "data": chunk.data.usage})

except Exception as e:
if "rate" in str(e).lower() or "429" in str(e):
Expand Down
8 changes: 4 additions & 4 deletions tests/strands/models/test_mistral.py
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Original file line number Diff line number Diff line change
Expand Up @@ -451,9 +451,9 @@ async def test_stream(mistral_client, model, agenerator, alist, captured_warning
delta=unittest.mock.Mock(content="test stream", tool_calls=None),
finish_reason="end_turn",
)
]
],
usage=mock_usage,
),
usage=mock_usage,
)

mistral_client.chat.stream_async = unittest.mock.AsyncMock(return_value=agenerator([mock_event]))
Expand Down Expand Up @@ -492,9 +492,9 @@ async def test_tool_choice_not_supported_warns(mistral_client, model, agenerator
delta=unittest.mock.Mock(content="test stream", tool_calls=None),
finish_reason="end_turn",
)
]
],
usage=mock_usage,
),
usage=mock_usage,
)

mistral_client.chat.stream_async = unittest.mock.AsyncMock(return_value=agenerator([mock_event]))
Expand Down