@@ -127,6 +127,16 @@ class UnsafeLocalCodeExecutor(BaseCodeExecutor):
   # optimize_data_file.
   optimize_data_file: bool = Field(default=False, frozen=True, exclude=True)
 
+  # Overrides the BaseCodeExecutor attribute: the base default of None waits
+  # for the execution forever, which non-terminating generated code turns into
+  # a hung agent.
+  timeout_seconds: int | None = 300
+  """The wall-clock timeout in seconds for a single code execution.
+
+  Defaults to 300, matching ``ContainerCodeExecutor`` and ``GkeCodeExecutor``.
+  None waits for the execution indefinitely.
+  """
+
   def __init__(self, **data: Any) -> None:
     """Initializes the UnsafeLocalCodeExecutor."""
     if 'stateful' in data and data['stateful']:
 
@@ -94,6 +94,14 @@ def test_init_default(self):
     executor = UnsafeLocalCodeExecutor()
     assert not executor.stateful
     assert not executor.optimize_data_file
+    # Bounded by default, so generated code that never terminates cannot hang
+    # the agent waiting on it.
+    assert executor.timeout_seconds == 300
+
+  def test_init_accepts_timeout_seconds_none(self):
+    """Asking for no timeout at all is still allowed, as on the base class."""
+    executor = UnsafeLocalCodeExecutor(timeout_seconds=None)
+    assert executor.timeout_seconds is None
 
   def test_init_stateful_raises_error(self):
     with pytest.raises(