diff --git a/atroposlib/tests/test_managed_server.py b/atroposlib/tests/test_managed_server.py
index fefe414c..fe68e4fb 100644
--- a/atroposlib/tests/test_managed_server.py
+++ b/atroposlib/tests/test_managed_server.py
@@ -292,6 +292,28 @@ async def test_get_logprobs_normalized_schema(mock_server):
     assert payload["prompt_topk_logprobs"] == prompt_topk_logprobs
 
 
+@pytest.mark.asyncio
+async def test_get_logprobs_strict_mode_rejects_misaligned_payload(mock_server):
+    """ManagedServer.get_logprobs fails fast on malformed prompt top-k payload."""
+    managed = ManagedServer(mock_server, tokenizer=mock_server.tokenizer)
+
+    prompt = "Hello"
+    prompt_tokens = mock_server.tokenizer.encode(prompt)
+
+    async def _mock_get_logprobs(**kwargs):
+        return {
+            "prompt_tokens": prompt_tokens,
+            "prompt_topk_token_ids": [[tok] for tok in prompt_tokens],
+            # Missing one row on purpose -> misaligned with prompt length
+            "prompt_topk_logprobs": [[-0.1] for _ in prompt_tokens[:-1]],
+        }
+
+    mock_server.get_logprobs = _mock_get_logprobs
+
+    with pytest.raises(ValueError, match="align with prompt_tokens length"):
+        await managed.get_logprobs(prompt=prompt, n=1)
+
+
 @pytest.mark.asyncio
 async def test_reset_clears_sequences(mock_server):
     """Test that reset() clears all tracked sequences."""