2 Messages after a successful tool call

[kubephil]

Describe the bug

The Agent SDK calls the responses API and receives two messages afterwards. It seems to be connected to tool calls. It happens most of the time when a tool call result has occurred, but not always.

Debug information

• Agents SDK version: (e.g. v0.1.0)
• Python version (e.g. Python 3.10)

Repro steps

I cannot safely reproduce this issue. Occasionally, when the Agent SDK performs a tool call, I get 2 responses in the output from the next responses API call. These responses are very similar or almost identical. I don't understand why there are 2 messages. Both messages have different IDs but nearly identical content.

Expected behavior

Only one message should be sent from the responses API, not two in one turn

[Rvey]

Yes, I can confirm this issue. It occurs occasionally, even when no tools have been invoked.

[kubephil]

Yes I can confirm, but actually this is not an Agent SDK bug -> It is related to the responses API https://community.openai.com/t/how-to-prevent-the-api-returning-multiple-outputs/1251365/27