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trimReplayDanglingAssistantToolCalls only collected tool results that immediately followed the assistant tool-call message. Models such as gpt-5.3-codex-spark may emit the function_call item before the explanation text within one response, so history replay order becomes assistant[tool_call] -> assistant[text] -> tool[result]. The call was misjudged as dangling and stripped while the tool result survived, producing a function_call_output without a matching function_call that the Responses API rejects with 400. - widen the response collection window to skip interleaved plain assistant text messages, and drop orphan tool results in the same pass - synthesize a placeholder function_call (or drop the output when the tool name is unknown) in normalizeOpenAIResponsesInput so conversations already persisted with corrupted history can resume