Python: Emit usage chunks via callback as they have empty content #12447
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markwallace-microsoft
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the
python
Python Test Coverage Report •
Python Unit Test Overview
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TaoChenOSU
reviewed
Jun 11, 2025
| @@ -450,9 +450,22 @@ async def invoke_stream( | |||
| response.name = self.name | |||
| response_builder.append(response.content) | |||
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| # Divert usage-based responses to the intermediate message handler, if present | |||
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Question: is this what dotnet is doing? I wonder if this is needed as we are draining the messages below.
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We drain function calling related methods below because they exist in the chat history. Usage related chunks aren't contained in the chat history, so they need specific handling here.
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Should the usage chunks be part of the chat history at the chat completion service level?
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Motivation and Context
We recently made an update to emit streaming chunk usage for the ChatCompletionAgent, but that can now include further complications as responses with usage will have empty content. We should be emitting this information via the optional
on_intermediate_messagecallback, so that the caller has content provided in the normal flow (anything un-related to the final message should be handled via the callback).Description
Fix the usage chunk flow and update the sample to show this behavior.
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