diff --git a/src/servers/tsfm/substrate/resolver.py b/src/servers/tsfm/substrate/resolver.py
index f803dcd9..ead7f31d 100644
--- a/src/servers/tsfm/substrate/resolver.py
+++ b/src/servers/tsfm/substrate/resolver.py
@@ -73,15 +73,30 @@
     "sktime.forecasting.trend.PolynomialTrendForecaster",  # Detrender's default forecaster
     "sklearn.preprocessing.StandardScaler",
     "sklearn.preprocessing.MinMaxScaler",
+    "sktime.transformations.series.exponent.SqrtTransformer",
+    "sktime.transformations.series.detrend.ConditionalDeseasonalizer",
+    "sktime.transformations.series.outlier_detection.HampelFilter",
+    "sktime.forecasting.trend.TrendForecaster",
+    "sklearn.preprocessing.RobustScaler",
     # run_tabular_recipe transforms (panel -> features)
     "sktime.transformations.series.summarize.SummaryTransformer",
     "sktime.transformations.panel.catch22.Catch22",
     "sktime.transformations.panel.rocket.MiniRocket",
-    # run_tabular_recipe estimators: tsfm_regression / tsfm_clustering
+    "sktime.transformations.panel.rocket.MiniRocketMultivariate",
+    "sktime.transformations.panel.rocket.Rocket",
+    # run_tabular_recipe estimators: tsfm_regression / tsfm_classification / tsfm_clustering
     "sklearn.ensemble.RandomForestRegressor",
     "sklearn.ensemble.GradientBoostingRegressor",
     "sklearn.linear_model.Ridge",
     "sklearn.cluster.KMeans",
+    "sklearn.ensemble.ExtraTreesRegressor",
+    "sklearn.linear_model.LinearRegression",
+    "sklearn.linear_model.Lasso",
+    "sklearn.neighbors.KNeighborsRegressor",
+    "sklearn.ensemble.ExtraTreesClassifier",
+    "sklearn.ensemble.GradientBoostingClassifier",
+    "sklearn.linear_model.LogisticRegression",
+    "sklearn.neighbors.KNeighborsClassifier",
 })
 
 
diff --git a/src/servers/tsfm/tests/test_no_code_exec.py b/src/servers/tsfm/tests/test_no_code_exec.py
index d6a0e57b..7f9b9eaf 100644
--- a/src/servers/tsfm/tests/test_no_code_exec.py
+++ b/src/servers/tsfm/tests/test_no_code_exec.py
@@ -109,6 +109,13 @@ def test_allowlisted_estimator_still_runs():
     assert r.get("status") == "success", r
 
 
+def test_every_allowed_class_imports():
+    from ..substrate.resolver import ALLOWED_CLASSES, _import_target
+
+    for path in ALLOWED_CLASSES:
+        assert isinstance(_import_target(path), type), path
+
+
 # File pointers: the read-back channel ------------------------------------------------------
 def test_file_pointer_outside_data_roots_is_refused():
     for p in ("/proc/self/environ", "file:///etc/passwd", "/etc/hostname",