diff --git a/apps/ai-game-creator-shell/src/features/project-summary/projectArtifactSummaries.ts b/apps/ai-game-creator-shell/src/features/project-summary/projectArtifactSummaries.ts
index 2181c5aac..ce4906830 100644
--- a/apps/ai-game-creator-shell/src/features/project-summary/projectArtifactSummaries.ts
+++ b/apps/ai-game-creator-shell/src/features/project-summary/projectArtifactSummaries.ts
@@ -311,7 +311,7 @@ export function inferProjectFileAssetDraft(
     };
   }
   if (extension === 'json') {
-    return { localPath, kind: 'data', mediaType: 'application/json' };
+    return { localPath, kind: 'document', mediaType: 'application/json' };
   }
   if (extension === 'html') {
     return { localPath, kind: 'document', mediaType: 'text/html' };
@@ -319,7 +319,10 @@ export function inferProjectFileAssetDraft(
   if (['txt', 'md', 'csv'].includes(extension)) {
     return { localPath, kind: 'document', mediaType: 'text/plain' };
   }
-  return { localPath, kind: 'asset', mediaType: 'application/octet-stream' };
+  // 判不出内容类型就写 `unknown`（→「待归类」），与 Rust 侧 `uploaded_asset_kind` 同口径：
+  // `/asset-register` 的 kind 会原样进 `register_local_asset` 的严格解析，写 `data` / `asset`
+  // 这类非 canonical 值只会被判成"认不出"并留痕，不能靠它表达"这是数据 / 这是资产"。
+  return { localPath, kind: 'unknown', mediaType: 'application/octet-stream' };
 }
 
 export function projectAssetDraftCommand(draft: ProjectAssetDraft) {