diff --git a/src/MCP-Tests/MCPToolMethodMutationTest.class.st b/src/MCP-Tests/MCPToolMethodMutationTest.class.st
index 3c3b911..424624a 100644
--- a/src/MCP-Tests/MCPToolMethodMutationTest.class.st
+++ b/src/MCP-Tests/MCPToolMethodMutationTest.class.st
@@ -826,6 +826,22 @@ MCPToolMethodMutationTest >> testCompileReturnsAllowlistedWarningCritiques [
 		self removeSelector: selector from: MCPToolGetMethodTestTarget ]
 ]
 
+{ #category : 'tests' }
+MCPToolMethodMutationTest >> testCompileReturnsAssignmentInBlockCritique [
+
+	| selector |
+	selector := #assignmentInBlockProbe.
+	self removeSelector: selector from: MCPToolMethodMutationTestTarget.
+	[
+		self
+			assertCompileForClassName: 'MCPToolMethodMutationTestTarget'
+			methodSource: 'assignmentInBlockProbe | value | [ value := 1 ] ensure: [ ] . ^ value'
+			protocol: 'tests'
+			returnsSingleCritiqueRuleClass: 'ReAssignmentInBlockRule'
+			titledLike: 'Unnecessary assignment or return in block' ] ensure: [
+		self removeSelector: selector from: MCPToolMethodMutationTestTarget ]
+]
+
 { #category : 'tests' }
 MCPToolMethodMutationTest >> testCompileReturnsCollectionThenDoCritique [
 
diff --git a/src/MCP/MCPToolMethodMutation.class.st b/src/MCP/MCPToolMethodMutation.class.st
index a7c1729..a5feaf8 100644
--- a/src/MCP/MCPToolMethodMutation.class.st
+++ b/src/MCP/MCPToolMethodMutation.class.st
@@ -57,6 +57,7 @@ MCPToolMethodMutation >> allowedNonErrorCritiqueRuleClasses [
 		  MCPRespondsToUsageRule.
 		  MCPSelectSizeCountRule.
 		  MCPSortedCollectionConversionRule.
+		  ReAssignmentInBlockRule.
 		  ReEquivalentSuperclassMethodsRule.
 		  ReExcessiveArgumentsRule.
 		  ReMissingSuperSendsRule.