I’m running into a similar issue when using the agents sdk (wrapping the responses API). See the github issue here: Agent run with previous_response_id fails - No tool output found for function call call_WdnUUKXKvwy3jk.... · Issue #1061 · openai/openai-agents-python · GitHub. As far as I can tell, this combined message + function_tool response breaks the agents-sdk.
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