diff --git a/benchmarks/invariant_merge_bench.py b/benchmarks/invariant_merge_bench.py
index 87e5e853b..fec065223 100644
--- a/benchmarks/invariant_merge_bench.py
+++ b/benchmarks/invariant_merge_bench.py
@@ -69,12 +69,13 @@ class MergeSmallSuite:
     def setup(self) -> None:
         """Create small invariant lists."""
         self.plan = _make_invariants(InvariantScope.PLAN, 3)
+        self.action = _make_invariants(InvariantScope.ACTION, 2)
         self.project = _make_invariants(InvariantScope.PROJECT, 5)
         self.global_invs = _make_invariants(InvariantScope.GLOBAL, 5)
 
     def time_merge_small(self) -> None:
-        """Benchmark merge with ~13 invariants."""
-        merge_invariants(self.plan, [], self.project, self.global_invs)
+        """Benchmark merge with ~15 invariants."""
+        merge_invariants(self.plan, self.action, self.project, self.global_invs)
 
 
 class MergeMediumSuite:
@@ -83,12 +84,13 @@ class MergeMediumSuite:
     def setup(self) -> None:
         """Create medium invariant lists."""
         self.plan = _make_invariants(InvariantScope.PLAN, 10)
+        self.action = _make_invariants(InvariantScope.ACTION, 5)
         self.project = _make_invariants(InvariantScope.PROJECT, 20)
         self.global_invs = _make_invariants(InvariantScope.GLOBAL, 20)
 
     def time_merge_medium(self) -> None:
-        """Benchmark merge with ~50 invariants."""
-        merge_invariants(self.plan, [], self.project, self.global_invs)
+        """Benchmark merge with ~55 invariants."""
+        merge_invariants(self.plan, self.action, self.project, self.global_invs)
 
 
 class MergeLargeSuite:
@@ -97,12 +99,13 @@ class MergeLargeSuite:
     def setup(self) -> None:
         """Create large invariant lists."""
         self.plan = _make_invariants(InvariantScope.PLAN, 50)
+        self.action = _make_invariants(InvariantScope.ACTION, 25)
         self.project = _make_invariants(InvariantScope.PROJECT, 100)
         self.global_invs = _make_invariants(InvariantScope.GLOBAL, 100)
 
     def time_merge_large(self) -> None:
-        """Benchmark merge with ~250 invariants."""
-        merge_invariants(self.plan, [], self.project, self.global_invs)
+        """Benchmark merge with ~275 invariants."""
+        merge_invariants(self.plan, self.action, self.project, self.global_invs)
 
 
 class MergeDeduplicationSuite:
@@ -118,6 +121,14 @@ class MergeDeduplicationSuite:
             )
             for i in range(20)
         ]
+        self.action = [
+            Invariant(
+                text=f"Shared constraint {i}",
+                scope=InvariantScope.ACTION,
+                source_name="action-001",
+            )
+            for i in range(20)
+        ]
         self.project = [
             Invariant(
                 text=f"Shared constraint {i}",
@@ -136,8 +147,8 @@ class MergeDeduplicationSuite:
         ]
 
     def time_merge_dedup(self) -> None:
-        """Benchmark merge with 60 invariants, all duplicates."""
-        merge_invariants(self.plan, [], self.project, self.global_invs)
+        """Benchmark merge with 80 invariants, all duplicates."""
+        merge_invariants(self.plan, self.action, self.project, self.global_invs)
 
 
 class InvariantSetMergeSuite:
@@ -146,12 +157,13 @@ class InvariantSetMergeSuite:
     def setup(self) -> None:
         """Create invariant lists."""
         self.plan = _make_invariants(InvariantScope.PLAN, 5)
+        self.action = _make_invariants(InvariantScope.ACTION, 3)
         self.project = _make_invariants(InvariantScope.PROJECT, 10)
         self.global_invs = _make_invariants(InvariantScope.GLOBAL, 10)
 
     def time_invariant_set_merge(self) -> None:
         """Benchmark InvariantSet.merge()."""
-        InvariantSet.merge(self.plan, [], self.project, self.global_invs)
+        InvariantSet.merge(self.plan, self.action, self.project, self.global_invs)
 
 
 class ServiceEffectiveSuite:
@@ -164,9 +176,15 @@ class ServiceEffectiveSuite:
             self.service.add_invariant(f"Global {i}", InvariantScope.GLOBAL, "system")
         for i in range(10):
             self.service.add_invariant(f"Project {i}", InvariantScope.PROJECT, "myapp")
+        for i in range(5):
+            self.service.add_invariant(
+                f"Action {i}", InvariantScope.ACTION, "action-001"
+            )
         for i in range(5):
             self.service.add_invariant(f"Plan {i}", InvariantScope.PLAN, "plan-001")
 
     def time_get_effective(self) -> None:
         """Benchmark get_effective_invariants()."""
-        self.service.get_effective_invariants(plan_id="plan-001", project_name="myapp")
+        self.service.get_effective_invariants(
+            plan_id="plan-001", project_name="myapp", action_name="action-001"
+        )
diff --git a/features/steps/invariant_models_steps.py b/features/steps/invariant_models_steps.py
index d5c8b025c..56fc31d2c 100644
--- a/features/steps/invariant_models_steps.py
+++ b/features/steps/invariant_models_steps.py
@@ -430,6 +430,7 @@ def step_service_all_scopes(context):
     context.service = InvariantService()
     context.service.add_invariant("Global rule", InvariantScope.GLOBAL, "system")
     context.service.add_invariant("Project rule", InvariantScope.PROJECT, "proj1")
+    context.service.add_invariant("Action rule", InvariantScope.ACTION, "action1")
     context.service.add_invariant("Plan rule", InvariantScope.PLAN, "plan1")