diff --git a/packages/core/src/schema/nodes/level.test.ts b/packages/core/src/schema/nodes/level.test.ts
index 839be780..e9e0efa9 100644
--- a/packages/core/src/schema/nodes/level.test.ts
+++ b/packages/core/src/schema/nodes/level.test.ts
@@ -48,4 +48,12 @@ describe('LevelNode', () => {
       nodes.map((node) => node.id),
     )
   })
+
+  test('accepts level child IDs minted by plugins', () => {
+    expect(
+      LevelNode.parse({
+        children: ['tree_plugin-child', 'flower_plugin-child', 'grass_plugin-child'],
+      }).children,
+    ).toEqual(['tree_plugin-child', 'flower_plugin-child', 'grass_plugin-child'])
+  })
 })
diff --git a/packages/core/src/schema/nodes/level.ts b/packages/core/src/schema/nodes/level.ts
index ef4de43a..1055648b 100644
--- a/packages/core/src/schema/nodes/level.ts
+++ b/packages/core/src/schema/nodes/level.ts
@@ -1,62 +1,13 @@
 import dedent from 'dedent'
 import { z } from 'zod'
 import { BaseNode, nodeType, objectId } from '../base'
-import { CeilingNode } from './ceiling'
-import { ColumnNode } from './column'
-import { DuctFittingNode } from './duct-fitting'
-import { DuctSegmentNode } from './duct-segment'
-import { DuctTerminalNode } from './duct-terminal'
-import { FenceNode } from './fence'
-import { GuideNode } from './guide'
-import { HvacEquipmentNode } from './hvac-equipment'
-import { ItemNode } from './item'
-import { LinesetNode } from './lineset'
-import { LiquidLineNode } from './liquid-line'
-import { MeasurementNode } from './measurement'
-import { PipeFittingNode } from './pipe-fitting'
-import { PipeSegmentNode } from './pipe-segment'
-import { PipeTrapNode } from './pipe-trap'
-import { RoofNode } from './roof'
-import { ScanNode } from './scan'
-import { ShelfNode } from './shelf'
-import { SlabNode } from './slab'
-import { SpawnNode } from './spawn'
-import { StairNode } from './stair'
-import { WallNode } from './wall'
-import { ZoneNode } from './zone'
 
 export const LevelNode = BaseNode.extend({
   id: objectId('level'),
   type: nodeType('level'),
-  children: z
-    .array(
-      z.union([
-        WallNode.shape.id,
-        FenceNode.shape.id,
-        ColumnNode.shape.id,
-        ItemNode.shape.id,
-        ZoneNode.shape.id,
-        SlabNode.shape.id,
-        CeilingNode.shape.id,
-        RoofNode.shape.id,
-        StairNode.shape.id,
-        ScanNode.shape.id,
-        GuideNode.shape.id,
-        MeasurementNode.shape.id,
-        SpawnNode.shape.id,
-        ShelfNode.shape.id,
-        DuctSegmentNode.shape.id,
-        DuctFittingNode.shape.id,
-        DuctTerminalNode.shape.id,
-        HvacEquipmentNode.shape.id,
-        LinesetNode.shape.id,
-        LiquidLineNode.shape.id,
-        PipeSegmentNode.shape.id,
-        PipeFittingNode.shape.id,
-        PipeTrapNode.shape.id,
-      ]),
-    )
-    .default([]),
+  // The node registry owns child-kind validity. Persisted level relationships
+  // must also admit IDs minted by plugins that core cannot enumerate.
+  children: z.array(z.string()).default([]),
   // Specific props
   level: z.number().default(0),
 }).describe(