diff --git a/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.test.ts b/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.test.ts
index 60c5ab44b5..c5032271c4 100644
--- a/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.test.ts
+++ b/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.test.ts
@@ -579,12 +579,20 @@ describe('Graph', () => {
         const metadata = g.getMetadataNode();
         expect(metadata).toHaveProperty('test');
       });
-      it('should update metadata on the metadata node', () => {
+      it("should overwrite metadata on the metadata node if the strategy is 'replace'", () => {
         const g = new Graph();
-        g.upsertMetadata({ test: 'test' });
-        g.upsertMetadata({ test: 'test2' });
+        g.upsertMetadata({ test: { foo: 'test' } }, 'replace');
+        g.upsertMetadata({ test: { bar: 'test2' } }, 'replace');
         const metadata = g.getMetadataNode();
-        expect(metadata.test).toBe('test2');
+        expect(metadata.test).toEqual({ bar: 'test2' });
+      });
+      it("should merge keys if the strategy is 'merge'", () => {
+        const g = new Graph();
+        g.upsertMetadata({ test: { foo: 'test' }, arr: [1] }, 'merge');
+        g.upsertMetadata({ test: { bar: 'test2' }, arr: [2] }, 'merge');
+        const metadata = g.getMetadataNode();
+        expect(metadata.test).toEqual({ foo: 'test', bar: 'test2' });
+        expect(metadata.arr).toEqual([1, 2]);
       });
     });
 
diff --git a/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.ts b/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.ts
index 081e2c4370..7d007c74bd 100644
--- a/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.ts
+++ b/invokeai/frontend/web/src/features/nodes/util/graph/generation/Graph.ts
@@ -1,4 +1,5 @@
 import { objectEquals } from '@observ33r/object-equals';
+import { mergeWith } from 'es-toolkit';
 import { forEach, groupBy, unset, values } from 'es-toolkit/compat';
 import { getPrefixedId } from 'features/controlLayers/konva/util';
 import { type ModelIdentifierField, zModelIdentifierField } from 'features/nodes/types/common';
@@ -387,11 +388,25 @@ export class Graph {
    * Add metadata to the graph. If the metadata node does not exist, it is created. If the specific metadata key exists,
    * it is overwritten.
    * @param metadata The metadata to add.
+   * @param strategy The strategy to use when adding metadata. If 'replace', any existing key is replaced. If 'add',
+   *    the metadata is deeply merged with the existing metadata. Arrays will be concatenated.
    * @returns The metadata node.
    */
-  upsertMetadata(metadata: Partial<S['CoreMetadataInvocation']>): S['CoreMetadataInvocation'] {
+  upsertMetadata(
+    metadata: Partial<S['CoreMetadataInvocation']>,
+    strategy: 'replace' | 'merge' = 'replace'
+  ): S['CoreMetadataInvocation'] {
     const node = this.getMetadataNode();
-    Object.assign(node, metadata);
+    if (strategy === 'replace') {
+      Object.assign(node, metadata);
+    } else {
+      // strategy === 'merge'
+      mergeWith(node, metadata, (objValue, srcValue) => {
+        if (Array.isArray(objValue)) {
+          return objValue.concat(srcValue);
+        }
+      });
+    }
     return node;
   }