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fix: _rstrip_last_assistant_message only strips trailing whitespace from the content — it does not remove the assistant message. #8060

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fix: _rstrip_last_assistant_message only strips trailing whitespace from the content — it does not remove the assistant message. #8060

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8 changes: 4 additions & 4 deletions python/packages/autogen-ext/src/autogen_ext/models/anthropic/_anthropic_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -542,10 +542,10 @@ def _rstrip_last_assistant_message(self, messages: Sequence[LLMMessage]) -> Sequ
"""
Remove the last assistant message if it is empty.
"""
# When Claude models last message is AssistantMessage, It could not end with whitespace
if isinstance(messages[-1], AssistantMessage):
if isinstance(messages[-1].content, str):
messages[-1].content = messages[-1].content.rstrip()
# When Claude models last message is AssistantMessage, it must be removed
# (Anthropic API requires conversation to end with a user message)
while messages and isinstance(messages[-1], AssistantMessage):
messages = messages[:-1]

return messages

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