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* fix(middleware): drop orphan ToolMessages with no matching AIMessage tool_call The rebuild loop only skipped ToolMessages whose tool_call_id matched a known AIMessage tool_call (to be re-emitted after it). An orphan ToolMessage whose tool_call_id has no matching AIMessage tool_calls fell through and was kept, leaving a dangling tool result that strict providers reject. Drop orphan ToolMessages as well, logging at debug. * fix(dangling): demote orphan-drop logs, add tool_call_id=None test - Update module/class docstrings to mention orphan ToolMessage handling - Accumulate orphan drop_count and emit a single logger.warning instead of per-message logger.debug calls - Simplify early-return logic: return None only when no patching AND no orphans were dropped - Add test_tool_call_id_none_orphan_is_dropped — a ToolMessage with tool_call_id=None is always an orphan and must be dropped Closes #4080 Co-Authored-By: Claude <noreply@anthropic.com> * fix(test): use model_construct for None tool_call_id test to bypass pydantic validation ToolMessage content='ghost' tool_call_id=None fails pydantic validation at construction. Use model_construct to simulate a corrupt/edge-case payload without tripping the string-only guard. Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>