diff --git a/cubed/runtime/executors/beam.py b/cubed/runtime/executors/beam.py
index e6861e452..d997cd866 100644
--- a/cubed/runtime/executors/beam.py
+++ b/cubed/runtime/executors/beam.py
@@ -83,7 +83,7 @@ class BeamExecutor(DagExecutor):
     """An execution engine that uses Apache Beam."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
     @property
     def name(self) -> str:
diff --git a/cubed/runtime/executors/coiled.py b/cubed/runtime/executors/coiled.py
index 751c4b3ac..8c176e9fd 100644
--- a/cubed/runtime/executors/coiled.py
+++ b/cubed/runtime/executors/coiled.py
@@ -22,7 +22,7 @@ class CoiledExecutor(DagExecutor):
     """An execution engine that uses Coiled Functions."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
     @property
     def name(self) -> str:
diff --git a/cubed/runtime/executors/dask.py b/cubed/runtime/executors/dask.py
index d4bfbc8a8..09eb23fe0 100644
--- a/cubed/runtime/executors/dask.py
+++ b/cubed/runtime/executors/dask.py
@@ -59,7 +59,7 @@ class DaskExecutor(DagExecutor):
     """An execution engine that uses Dask Distributed's async API."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
     @property
     def name(self) -> str:
diff --git a/cubed/runtime/executors/lithops.py b/cubed/runtime/executors/lithops.py
index f0904a9d7..f15ebf5dd 100644
--- a/cubed/runtime/executors/lithops.py
+++ b/cubed/runtime/executors/lithops.py
@@ -257,7 +257,7 @@ class LithopsExecutor(DagExecutor):
     """An execution engine that uses Lithops."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
     @property
     def name(self) -> str:
diff --git a/cubed/runtime/executors/local.py b/cubed/runtime/executors/local.py
index 2148cf12d..dbb5cfe8e 100644
--- a/cubed/runtime/executors/local.py
+++ b/cubed/runtime/executors/local.py
@@ -114,7 +114,7 @@ class ThreadsExecutor(DagExecutor):
     """An execution engine that uses Python asyncio."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
         # Tell NumPy to use a single thread
         # from https://stackoverflow.com/questions/30791550/limit-number-of-threads-in-numpy
@@ -204,7 +204,7 @@ class ProcessesExecutor(DagExecutor):
     """An execution engine that uses local processes."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
         # Tell NumPy to use a single thread
         # from https://stackoverflow.com/questions/30791550/limit-number-of-threads-in-numpy
diff --git a/cubed/runtime/executors/modal.py b/cubed/runtime/executors/modal.py
index fc3d2fd69..d0b837971 100644
--- a/cubed/runtime/executors/modal.py
+++ b/cubed/runtime/executors/modal.py
@@ -141,7 +141,7 @@ class ModalExecutor(DagExecutor):
     """An execution engine that uses Modal's async API."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
     @property
     def name(self) -> str:
diff --git a/cubed/runtime/executors/ray.py b/cubed/runtime/executors/ray.py
index def8ab7d4..8ca739721 100644
--- a/cubed/runtime/executors/ray.py
+++ b/cubed/runtime/executors/ray.py
@@ -15,7 +15,7 @@ class RayExecutor(DagExecutor):
     """An execution engine that uses Ray."""
 
     def __init__(self, **kwargs):
-        self.kwargs = kwargs
+        super().__init__(**kwargs)
 
     @property
     def name(self) -> str:
diff --git a/cubed/runtime/executors/spark.py b/cubed/runtime/executors/spark.py
index bdd13236f..dffc9bf17 100644
--- a/cubed/runtime/executors/spark.py
+++ b/cubed/runtime/executors/spark.py
@@ -20,7 +20,6 @@ class SparkExecutor(DagExecutor):
     MIN_MEMORY_MiB = 512
 
     def __init__(self, **kwargs):
-        self._callbacks = None
         super().__init__(**kwargs)
 
     @property
@@ -57,9 +56,6 @@ def execute_dag(
         compute_id: Optional[str] = None,
         **kwargs: Any,
     ):
-        # Store callbacks for later use during computation
-        self._callbacks = callbacks
-
         # Configure Spark memory settings from Spec if provided
         spark_builder = SparkSession.builder
         if spec is not None and hasattr(spec, "allowed_mem") and spec.allowed_mem:
diff --git a/cubed/runtime/types.py b/cubed/runtime/types.py
index 9a3636450..52858314a 100644
--- a/cubed/runtime/types.py
+++ b/cubed/runtime/types.py
@@ -8,6 +8,18 @@
 
 
 class DagExecutor:
+    def __init__(self, **kwargs):
+        self.kwargs = kwargs
+
+    def __eq__(self, other):
+        if isinstance(other, DagExecutor):
+            return self.name == other.name and self.kwargs == other.kwargs
+        else:
+            return False
+
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}(kwargs={self.kwargs})"
+
     @property
     def name(self) -> str:
         raise NotImplementedError  # pragma: no cover
diff --git a/cubed/spec.py b/cubed/spec.py
index da6b9c8ec..22d0ba6bb 100644
--- a/cubed/spec.py
+++ b/cubed/spec.py
@@ -125,14 +125,14 @@ def zarr_compressor(self) -> Union[dict, str, None]:
         return self._zarr_compressor
 
     @property
-    def intermediate_store(self) -> Union[dict, str, None]:
+    def intermediate_store(self) -> Union[T_Store, None]:
         """The Zarr store for intermediate data. Takes precedence over ``work_dir``."""
         return self._intermediate_store
 
     def __repr__(self) -> str:
         return (
-            f"cubed.Spec(work_dir={self._work_dir}, intermediate_store={self._intermediate_store}, allowed_mem={self._allowed_mem}, "
-            f"reserved_mem={self._reserved_mem}, executor={self._executor}, storage_options={self._storage_options}, zarr_compressor={self._zarr_compressor})"
+            f"cubed.Spec(work_dir={self.work_dir}, intermediate_store={self.intermediate_store}, allowed_mem={self.allowed_mem}, "
+            f"reserved_mem={self.reserved_mem}, executor={self.executor}, storage_options={self.storage_options}, zarr_compressor={self.zarr_compressor})"
         )
 
     def __eq__(self, other):
diff --git a/cubed/tests/test_executor_features.py b/cubed/tests/test_executor_features.py
index 24160029c..0a319f1b5 100644
--- a/cubed/tests/test_executor_features.py
+++ b/cubed/tests/test_executor_features.py
@@ -73,6 +73,22 @@ def mock_apply_blockwise(*args, **kwargs):
     return apply_blockwise(*args, **kwargs)
 
 
+def test_equality():
+    executor = create_executor("threads")
+    assert executor == create_executor("threads")
+
+    executor_2_max_workers = create_executor(
+        "threads", executor_options=dict(max_workers=2)
+    )
+    assert executor_2_max_workers == create_executor(
+        "threads", executor_options=dict(max_workers=2)
+    )
+    assert executor_2_max_workers != create_executor("threads")
+    assert executor_2_max_workers != create_executor(
+        "threads", executor_options=dict(max_workers=1)
+    )
+
+
 # see tests/runtime for more tests for retries for other executors
 @pytest.mark.skipif(
     platform.system() == "Windows", reason="measuring memory does not run on windows"