diff --git a/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/GenericContext.java b/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/GenericContext.java
index 243ceb8d1..243cd7af3 100644
--- a/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/GenericContext.java
+++ b/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/GenericContext.java
@@ -39,6 +39,47 @@ public final class GenericContext {
         this.boundFallbacks = boundFallbacks != null ? boundFallbacks : new HashMap<>();
     }
 
+    /**
+     * Create a GenericContext directly from declared type parameters and applied type arguments.
+     * 
+     * Unlike {@link #forReceiver(TypeInfo)}, this does NOT introspect a TypeInfo, so it cannot
+     * trigger recursive parameterization. Use this inside {@code parameterize()} implementations
+     * to avoid the cycle: parameterize → forReceiver → substitute → parameterize.
+     *
+     * @param declaredParams the declared type parameters (e.g., [T, E])
+     * @param appliedArgs the applied type arguments (e.g., [String, Integer])
+     * @return a context mapping param names to applied args (with bound fallbacks for unmatched params)
+     */
+    public static GenericContext fromBindings(List<TypeParamInfo> declaredParams, List<TypeInfo> appliedArgs) {
+        if (declaredParams == null || declaredParams.isEmpty()) {
+            return EMPTY;
+        }
+
+        Map<String, TypeInfo> applied = new HashMap<>();
+        if (appliedArgs != null) {
+            int count = Math.min(declaredParams.size(), appliedArgs.size());
+            for (int i = 0; i < count; i++) {
+                TypeParamInfo declared = declaredParams.get(i);
+                TypeInfo arg = appliedArgs.get(i);
+                if (declared == null || declared.getName() == null || declared.getName().isEmpty() || arg == null) {
+                    continue;
+                }
+                applied.put(declared.getName(), arg);
+            }
+        }
+
+        Map<String, TypeInfo> bounds = new HashMap<>();
+        for (TypeParamInfo declared : declaredParams) {
+            if (declared == null) continue;
+            String name = declared.getName();
+            if (name == null || name.isEmpty()) continue;
+            TypeInfo bound = declared.getBoundTypeInfo();
+            bounds.put(name, (bound != null && bound.isResolved()) ? bound : TypeInfo.OBJECT);
+        }
+
+        return new GenericContext(applied, bounds);
+    }
+
     /**
      * Create a GenericContext for a receiver type.
      * 
@@ -85,7 +126,13 @@ public final class GenericContext {
                 String name = declared.getName();
                 if (name == null || name.isEmpty()) continue;
                 TypeInfo bound = declared.getBoundTypeInfo();
-                bounds.put(name, (bound != null && bound.isResolved()) ? bound : TypeInfo.OBJECT);
+                TypeInfo effectiveBound = (bound != null && bound.isResolved()) ? bound : TypeInfo.OBJECT;
+                
+                List<TypeInfo> additionalBounds = declared.getAdditionalBoundTypes();
+                if (additionalBounds != null && !additionalBounds.isEmpty()) {
+                    effectiveBound = IntersectionTypeInfo.of(effectiveBound, additionalBounds);
+                }
+                bounds.put(name, effectiveBound);
             }
         }
 
diff --git a/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/ScriptTypeInfo.java b/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/ScriptTypeInfo.java
index b75c4afcb..2c49b036a 100644
--- a/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/ScriptTypeInfo.java
+++ b/src/main/java/noppes/npcs/client/gui/util/script/interpreter/type/ScriptTypeInfo.java
@@ -11,8 +11,10 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * Represents a type defined within the script itself (not from Java classpath).
@@ -40,6 +42,11 @@ public class ScriptTypeInfo extends TypeInfo {
     
     // Generic type parameters declared on this type (e.g., <E>, <K, V>, <T extends Entity>)
     private final List<TypeParamInfo> declaredTypeParams = new ArrayList<>();
+
+    // Recursion guard: tracks ScriptTypeInfo instances currently being parameterized on this thread
+    // to break the cycle: parameterize → substitute → parameterize (self-referential types)
+    private static final ThreadLocal<Set<ScriptTypeInfo>> PARAMETERIZING =
+            ThreadLocal.withInitial(HashSet::new);
     
     // Parent class reference (for inner class resolution)
     private ScriptTypeInfo outerClass;
@@ -166,34 +173,48 @@ public class ScriptTypeInfo extends TypeInfo {
     @Override
     public TypeInfo parameterize(List<TypeInfo> typeArgs) {
         if (typeArgs == null || typeArgs.isEmpty()) return this;
-        ScriptTypeInfo result = new ScriptTypeInfo(getSimpleName(), getFullName(), getKind(),
-                declarationOffset, bodyStart, bodyEnd, modifiers);
-        result.setRawType(this);
-        result.setAppliedTypeArgs(typeArgs);
-        result.superClass = this.superClass;
-        result.superClassName = this.superClassName;
-        result.implementedInterfaces.addAll(this.implementedInterfaces);
-        result.implementedInterfaceNames.addAll(this.implementedInterfaceNames);
-        result.declaredTypeParams.addAll(this.declaredTypeParams);
-        result.outerClass = this.outerClass;
-        GenericContext ctx = GenericContext.forReceiver(result);
 
-        // Parameterize methods, constructors, and fields with the generic context of this type. 
-        for (Map.Entry<String, List<MethodInfo>> entry : this.methods.entrySet()) {
-            List<MethodInfo> substituted = new ArrayList<>();
-            for (MethodInfo m : entry.getValue()) substituted.add(substituteMethod(m, ctx));
-            result.methods.put(entry.getKey(), substituted);
+        Set<ScriptTypeInfo> active = PARAMETERIZING.get();
+        if (!active.add(this)) {
+            // Re-entrant call on the same raw type — fall back to shallow parameterization
+            // (no method/field substitution) to break the infinite recursion.
+            return super.parameterize(typeArgs);
         }
-        for (MethodInfo ctor : this.constructors) {
-            result.constructors.add(substituteMethod(ctor, ctx));
+
+        try {
+            ScriptTypeInfo result = new ScriptTypeInfo(getSimpleName(), getFullName(), getKind(),
+                    declarationOffset, bodyStart, bodyEnd, modifiers);
+            result.setRawType(this);
+            result.setAppliedTypeArgs(typeArgs);
+            result.superClass = this.superClass;
+            result.superClassName = this.superClassName;
+            result.implementedInterfaces.addAll(this.implementedInterfaces);
+            result.implementedInterfaceNames.addAll(this.implementedInterfaceNames);
+            result.declaredTypeParams.addAll(this.declaredTypeParams);
+            result.outerClass = this.outerClass;
+            // Use fromBindings instead of forReceiver to avoid infinite recursion:
+            // forReceiver(result) → substitute() → parameterize() → forReceiver() → ...
+            GenericContext ctx = GenericContext.fromBindings(this.declaredTypeParams, typeArgs);
+
+            // Parameterize methods, constructors, and fields with the generic context of this type. 
+            for (Map.Entry<String, List<MethodInfo>> entry : this.methods.entrySet()) {
+                List<MethodInfo> substituted = new ArrayList<>();
+                for (MethodInfo m : entry.getValue()) substituted.add(substituteMethod(m, ctx));
+                result.methods.put(entry.getKey(), substituted);
+            }
+            for (MethodInfo ctor : this.constructors) {
+                result.constructors.add(substituteMethod(ctor, ctx));
+            }
+            for (Map.Entry<String, FieldInfo> entry : this.fields.entrySet()) {
+                FieldInfo f = entry.getValue();
+                TypeInfo subType = ctx.substitute(f.getTypeInfo());
+                result.fields.put(entry.getKey(), subType != f.getTypeInfo()
+                        ? FieldInfo.external(f.getName(), subType, null, f.getModifiers()) : f);
+            }
+            return result;
+        } finally {
+            active.remove(this);
         }
-        for (Map.Entry<String, FieldInfo> entry : this.fields.entrySet()) {
-            FieldInfo f = entry.getValue();
-            TypeInfo subType = ctx.substitute(f.getTypeInfo());
-            result.fields.put(entry.getKey(), subType != f.getTypeInfo()
-                    ? FieldInfo.external(f.getName(), subType, null, f.getModifiers()) : f);
-        }
-        return result;
     }
 
     // ==================== INHERITANCE ====================