diff --git a/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorState.ts b/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorState.ts
index a65ed50dc..d04c52f93 100644
--- a/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorState.ts
+++ b/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorState.ts
@@ -524,6 +524,40 @@ function spriteResourceValidationError(sprite: SpriteAsset) {
   return border.ok ? null : border.message;
 }
 
+/**
+ * Apply the SpriteAsset resource checks without acquiring the editor mutation
+ * guard.  Workflow adapters use this while a State lock is already held so
+ * resource insertion and component backfill can be committed atomically.
+ */
+export function addSpriteAssetsToState(
+  current: State,
+  assets: readonly SpriteAsset[],
+): UiEditorOperationResult<State> {
+  const unique = new Map<SpriteAssetId, SpriteAsset>();
+  for (const asset of assets) {
+    const candidate =
+      unique.get(asset.asset_id) ?? current.sprite_assets[asset.asset_id];
+    if (candidate && !sameResource(candidate, asset)) {
+      return { ok: false, reason: 'duplicate' };
+    }
+    unique.set(asset.asset_id, asset);
+  }
+  const invalidSprite = [...unique.values()]
+    .map((asset) => ({ asset, error: spriteResourceValidationError(asset) }))
+    .find((item) => item.error);
+  if (invalidSprite?.error) {
+    return {
+      ok: false,
+      reason: `invalid:${invalidSprite.asset.asset_id}：${invalidSprite.error}`,
+    };
+  }
+  const next = cloneState(current);
+  for (const asset of unique.values()) {
+    next.sprite_assets[asset.asset_id] = structuredClone(asset);
+  }
+  return { ok: true, value: next };
+}
+
 function fontResourceValidationError(font: FontAsset) {
   if (font.asset_id.trim().length === 0) return '缺少字体 ID';
   if (font.path.trim().length === 0) return '缺少字体路径';
@@ -782,32 +816,9 @@ export function useUiEditorState(initialState: State = EMPTY_UI_EDITOR_STATE) {
       const blocked = guard();
       if (blocked) return blocked;
       const current = stateRef.current;
-      const unique = new Map<SpriteAssetId, SpriteAsset>();
-      for (const asset of assets) {
-        const candidate =
-          unique.get(asset.asset_id) ?? current.sprite_assets[asset.asset_id];
-        if (candidate && !sameResource(candidate, asset)) {
-          return { ok: false, reason: 'duplicate' };
-        }
-        unique.set(asset.asset_id, asset);
-      }
-      const invalidSprite = [...unique.values()]
-        .map((asset) => ({
-          asset,
-          error: spriteResourceValidationError(asset),
-        }))
-        .find((item) => item.error);
-      if (invalidSprite?.error) {
-        return {
-          ok: false,
-          reason: `invalid:${invalidSprite.asset.asset_id}：${invalidSprite.error}`,
-        };
-      }
-      const next = cloneState(current);
-      for (const asset of unique.values()) {
-        next.sprite_assets[asset.asset_id] = structuredClone(asset);
-      }
-      commit(next);
+      const result = addSpriteAssetsToState(current, assets);
+      if (!result.ok) return result;
+      commit(result.value);
       return { ok: true, value: undefined };
     },
     [commit, guard],