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Python: fix(anthropic): map every Anthropic stop reason instead of raising KeyError #14616

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Python: fix(anthropic): map every Anthropic stop reason instead of raising KeyError #14616

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Python: fix(anthropic): map every Anthropic stop reason instead of ra…
pcbeingused333 Oct 16, 2026
6ca3ea0
Merge branch 'main' into fix/anthropic-unmapped-stop-reasons
pcbeingused333 Oct 26, 2026
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7 changes: 5 additions & 2 deletions python/semantic_kernel/connectors/ai/anthropic/services/anthropic_chat_completion.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,8 +65,11 @@
# map finish reasons from Anthropic to Semantic Kernel
ANTHROPIC_TO_SEMANTIC_KERNEL_FINISH_REASON_MAP = {
"end_turn": SemanticKernelFinishReason.STOP,
"stop_sequence": SemanticKernelFinishReason.STOP,
"max_tokens": SemanticKernelFinishReason.LENGTH,
"model_context_window_exceeded": SemanticKernelFinishReason.LENGTH,
"tool_use": SemanticKernelFinishReason.TOOL_CALLS,
"refusal": SemanticKernelFinishReason.CONTENT_FILTER,
}

logger: logging.Logger = logging.getLogger(__name__)
Expand Down Expand Up @@ -274,7 +277,7 @@ def _create_chat_message_content(

finish_reason = None
if response.stop_reason:
finish_reason = ANTHROPIC_TO_SEMANTIC_KERNEL_FINISH_REASON_MAP[response.stop_reason]
finish_reason = ANTHROPIC_TO_SEMANTIC_KERNEL_FINISH_REASON_MAP.get(response.stop_reason)

return ChatMessageContent(
inner_content=response,
Expand Down Expand Up @@ -312,7 +315,7 @@ def _create_streaming_chat_message_content(
)
)
elif isinstance(stream_event, RawMessageDeltaEvent):
finish_reason = ANTHROPIC_TO_SEMANTIC_KERNEL_FINISH_REASON_MAP[str(stream_event.delta.stop_reason)]
finish_reason = ANTHROPIC_TO_SEMANTIC_KERNEL_FINISH_REASON_MAP.get(str(stream_event.delta.stop_reason))
usage = _get_completion_usage(stream_event.usage)
start_usage = metadata.get("usage") if metadata else None
if getattr(stream_event.usage, "input_tokens", None) is None and isinstance(start_usage, CompletionUsage):
Expand Down
38 changes: 38 additions & 0 deletions python/tests/unit/connectors/ai/anthropic/services/test_anthropic_chat_completion.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
from semantic_kernel.contents.chat_message_content import ChatMessageContent, FunctionCallContent, TextContent
from semantic_kernel.contents.streaming_chat_message_content import StreamingChatMessageContent
from semantic_kernel.contents.utils.author_role import AuthorRole
from semantic_kernel.contents.utils.finish_reason import FinishReason
from semantic_kernel.exceptions import (
ServiceInitializationError,
ServiceInvalidExecutionSettingsError,
Expand Down Expand Up @@ -666,3 +667,40 @@ async def async_generator():
gen_ai_attributes.INPUT_TOKENS: 130,
gen_ai_attributes.OUTPUT_TOKENS: 7,
}


@pytest.mark.parametrize(
("stop_reason", "finish_reason"),
[
("end_turn", FinishReason.STOP),
("stop_sequence", FinishReason.STOP),
("max_tokens", FinishReason.LENGTH),
("model_context_window_exceeded", FinishReason.LENGTH),
("tool_use", FinishReason.TOOL_CALLS),
("refusal", FinishReason.CONTENT_FILTER),
("pause_turn", None),
],
)
def test_stop_reason_maps_to_finish_reason(anthropic_unit_test_env, stop_reason, finish_reason) -> None:
chat_completion = AnthropicChatCompletion()
message = Message(
id="msg_1",
type="message",
role="assistant",
model="claude-sonnet-4-5",
content=[TextBlock(type="text", text="Hello")],
stop_reason=stop_reason,
stop_sequence=None,
usage=Usage(input_tokens=1, output_tokens=1),
)
delta_event = RawMessageDeltaEvent(
type="message_delta",
delta=Delta(stop_reason=stop_reason, stop_sequence=None),
usage=MessageDeltaUsage(output_tokens=1),
)

content = chat_completion._create_chat_message_content(message, {})
streaming_content = chat_completion._create_streaming_chat_message_content(delta_event)

assert content.finish_reason == finish_reason
assert streaming_content.finish_reason == finish_reason
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