Fail fast on async loop contract runtime errors

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

hyperbrowser/client/polling.py

@@ -128,11 +128,22 @@ def _is_reused_coroutine_runtime_error(exc: Exception) -> bool:
     return "coroutine" in normalized_message and "already awaited" in normalized_message
 
 
+def _is_async_loop_contract_runtime_error(exc: Exception) -> bool:
+    if not isinstance(exc, RuntimeError):
+        return False
+    normalized_message = str(exc).lower()
+    if "event loop is closed" in normalized_message:
+        return True
+    return "different loop" in normalized_message and "future" in normalized_message
+
+
 def _is_retryable_exception(exc: Exception) -> bool:
     if isinstance(exc, (StopIteration, StopAsyncIteration)):
         return False
     if _is_reused_coroutine_runtime_error(exc):
         return False
+    if _is_async_loop_contract_runtime_error(exc):
+        return False
     if isinstance(exc, ConcurrentCancelledError):
         return False
     if isinstance(exc, _NonRetryablePollingError):

tests/test_polling.py

@@ -1184,6 +1184,47 @@ async def get_status() -> str:
     asyncio.run(run())
 
 
+def test_retry_operation_does_not_retry_runtime_errors_for_loop_mismatch():
+    attempts = {"count": 0}
+
+    def operation() -> str:
+        attempts["count"] += 1
+        raise RuntimeError("Task got Future attached to a different loop")
+
+    with pytest.raises(RuntimeError, match="different loop"):
+        retry_operation(
+            operation_name="sync retry loop-mismatch runtime error",
+            operation=operation,
+            max_attempts=5,
+            retry_delay_seconds=0.0001,
+        )
+
+    assert attempts["count"] == 1
+
+
+def test_poll_until_terminal_status_async_does_not_retry_runtime_errors_for_closed_loop():
+    async def run() -> None:
+        attempts = {"count": 0}
+
+        async def get_status() -> str:
+            attempts["count"] += 1
+            raise RuntimeError("Event loop is closed")
+
+        with pytest.raises(RuntimeError, match="Event loop is closed"):
+            await poll_until_terminal_status_async(
+                operation_name="async poll closed-loop runtime error",
+                get_status=get_status,
+                is_terminal_status=lambda value: value == "completed",
+                poll_interval_seconds=0.0001,
+                max_wait_seconds=1.0,
+                max_status_failures=5,
+            )
+
+        assert attempts["count"] == 1
+
+    asyncio.run(run())
+
+
 def test_async_poll_until_terminal_status_allows_immediate_terminal_on_zero_max_wait():
     async def run() -> None:
         status = await poll_until_terminal_status_async(