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fix(azure-ai-inference): guard against IndexError when tool message items list is empty #13678

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fix(azure-ai-inference): guard against IndexError when tool message items list is empty #13678

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3 changes: 3 additions & 0 deletions python/semantic_kernel/connectors/ai/azure_ai_inference/services/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,9 @@ def _format_tool_message(message: ChatMessageContent) -> ToolMessage:
Returns:
The formatted tool message.
"""
if len(message.items) == 0:
raise ValueError("Tool message has no items; expected exactly one FunctionResultContent item.")
Comment on lines +137 to +138
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Copilot AI Mar 20, 2026

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Add a unit test covering the new empty-items guard (TOOL ChatMessageContent with items=[]), asserting a ValueError is raised and the message is descriptive. This prevents regressions back to an IndexError and locks in the intended error behavior.

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if len(message.items) != 1:
logger.warning(
"Unsupported number of items in Tool message while formatting chat history for Azure AI"
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