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fix(streaming): accumulate container from message_delta in non-beta helper #1802

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fix(streaming): accumulate container from message_delta in non-beta helper #1802

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1 change: 1 addition & 0 deletions src/anthropic/lib/streaming/_messages.py
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Original file line number Diff line number Diff line change
Expand Up @@ -501,6 +501,7 @@ def accumulate_event(
if content_block.type == "text" and is_given(output_format):
content_block.parsed_output = parse_text(content_block.text, output_format)
elif event.type == "message_delta":
current_snapshot.container = event.delta.container
current_snapshot.stop_reason = event.delta.stop_reason
current_snapshot.stop_sequence = event.delta.stop_sequence
if event.delta.stop_details is not None:
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26 changes: 26 additions & 0 deletions tests/lib/streaming/fixtures/container_response.txt
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@@ -0,0 +1,26 @@
event: message_start
data: {"type":"message_start","message":{"id":"msg_4QpJur2dWWDjF6C758FbBw5vm12BaVipnK","type":"message","role":"assistant","content":[],"model":"claude-3-opus-latest","stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":11,"output_tokens":1}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" there"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"!"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null,"container":{"id":"container_011CPmr789A6Pg7Rjhvi6cvJ","expires_at":"2026-08-05T12:00:00Z"}},"usage":{"output_tokens":6}}

event: message_stop
data: {"type":"message_stop"}
21 changes: 21 additions & 0 deletions tests/lib/streaming/test_messages.py
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Expand Up @@ -114,6 +114,27 @@ def assert_refusal_response(message: Message) -> None:


class TestSyncMessages:
@pytest.mark.respx(base_url=base_url)
def test_container_accumulated_from_message_delta(self, respx_mock: MockRouter) -> None:
respx_mock.post("/v1/messages").mock(
return_value=httpx.Response(200, content=get_response("container_response.txt"))
)

with sync_client.messages.stream(
max_tokens=1024,
messages=[
{
"role": "user",
"content": "Say hello there!",
}
],
model="claude-3-opus-latest",
) as stream:
message = stream.get_final_message()

assert message.container is not None
assert message.container.id == "container_011CPmr789A6Pg7Rjhvi6cvJ"

@pytest.mark.respx(base_url=base_url)
def test_basic_response(self, respx_mock: MockRouter) -> None:
respx_mock.post("/v1/messages").mock(
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