diff --git a/litellm/proxy/db/db_spend_update_writer.py b/litellm/proxy/db/db_spend_update_writer.py
index dc928921425..f233c7cfea0 100644
--- a/litellm/proxy/db/db_spend_update_writer.py
+++ b/litellm/proxy/db/db_spend_update_writer.py
@@ -1737,22 +1737,9 @@ async def add_spend_log_transaction_to_daily_agent_transaction(
                 "agent_id is None for request. Skipping incrementing agent spend."
             )
             return
-        payload_with_agent_id = cast(
-            SpendLogsPayload,
-            {
-                **payload,
-                "agent_id": payload["agent_id"],
-            },
-        )
-        base_daily_transaction = (
-            await self._common_add_spend_log_transaction_to_daily_transaction(
-                payload_with_agent_id, prisma_client, "agent"
-            )
-        )
-        if base_daily_transaction is None:
-            return
+
         endpoint_str = base_daily_transaction.get("endpoint") or ""
-        daily_transaction_key = f"{payload['agent_id']}_{base_daily_transaction['date']}_{payload_with_agent_id['api_key']}_{payload_with_agent_id['model']}_{payload_with_agent_id['custom_llm_provider']}_{endpoint_str}"
+        daily_transaction_key = f"{payload['agent_id']}_{base_daily_transaction['date']}_{payload['api_key']}_{payload['model']}_{payload['custom_llm_provider']}_{endpoint_str}"
         daily_transaction = DailyAgentSpendTransaction(
             agent_id=payload['agent_id'], **base_daily_transaction
         )
diff --git a/tests/test_litellm/proxy/db/test_db_spend_update_writer.py b/tests/test_litellm/proxy/db/test_db_spend_update_writer.py
index 6ccecf59eed..42350d1e28e 100644
--- a/tests/test_litellm/proxy/db/test_db_spend_update_writer.py
+++ b/tests/test_litellm/proxy/db/test_db_spend_update_writer.py
@@ -790,6 +790,53 @@ async def test_add_spend_log_transaction_to_daily_agent_transaction_skips_when_a
     writer.daily_agent_spend_update_queue.add_update.assert_not_called()
 
 
+@pytest.mark.asyncio
+async def test_daily_agent_transaction_calls_common_helper_once():
+    """
+    Regression test for #21181: _common_add_spend_log_transaction_to_daily_transaction
+    should be called exactly once per request in the agent spend path, not twice.
+    """
+    writer = DBSpendUpdateWriter()
+    mock_prisma = MagicMock()
+    mock_prisma.get_request_status = MagicMock(return_value="success")
+
+    payload = {
+        "request_id": "req-dedup",
+        "agent_id": "agent-dedup",
+        "user": "test-user",
+        "startTime": "2024-01-01T12:00:00",
+        "api_key": "test-key",
+        "model": "gpt-4",
+        "custom_llm_provider": "openai",
+        "model_group": "gpt-4-group",
+        "prompt_tokens": 20,
+        "completion_tokens": 10,
+        "spend": 0.3,
+        "metadata": '{"usage_object": {}}',
+    }
+
+    writer.daily_agent_spend_update_queue.add_update = AsyncMock()
+
+    with patch.object(
+        writer,
+        "_common_add_spend_log_transaction_to_daily_transaction",
+        wraps=writer._common_add_spend_log_transaction_to_daily_transaction,
+    ) as mock_common:
+        await writer.add_spend_log_transaction_to_daily_agent_transaction(
+            payload=payload,
+            prisma_client=mock_prisma,
+        )
+
+        # The common helper should be called exactly once, not twice
+        assert mock_common.call_count == 1, (
+            f"Expected _common_add_spend_log_transaction_to_daily_transaction to be "
+            f"called once, but it was called {mock_common.call_count} times"
+        )
+
+    # Verify the transaction was still queued correctly
+    writer.daily_agent_spend_update_queue.add_update.assert_called_once()
+
+
 @pytest.mark.asyncio
 async def test_endpoint_field_is_correctly_mapped_from_call_type():
     """