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1cc21cc45b
Non-spark codex models (gpt-5.3-codex, gpt-5.2-codex) stream function call arguments via multiple delta events followed by a done event. The done handler unconditionally emitted the full arguments, duplicating what deltas already streamed. This produced invalid double JSON that Claude Code couldn't parse, causing tool calls to fail with missing parameters and infinite retry loops. Add HasReceivedArgumentsDelta flag to track whether delta events were received. The done handler now only emits arguments when no deltas preceded it (spark models), while delta-based streaming continues to work for non-spark models.