diff --git a/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs b/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs
index 620701eb0..eb2d75db9 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs
@@ -290,6 +290,32 @@ mod tests {
         );
     }
 
+    #[test]
+    fn legacy_raw_catalog_payload_defaults_optional_fields() {
+        // 旧 dev 代理 / 本地 fixture 直接返回裸目录（没有 `ok` 信封），且缺少
+        // `agentMode` / `protocol` / `unavailableModels`：必须仍能解析，并按 Codex +
+        // OpenAI Responses + 空不可用桶兼容。
+        let body = serde_json::json!({
+            "defaultModelId": "quality",
+            "models": [{ "id": "quality", "displayName": "高质量" }],
+            "revision": 9
+        })
+        .to_string();
+
+        let catalog = parse_catalog_payload(body.as_bytes()).expect("raw catalog should parse");
+        assert_eq!(catalog.default_model_id, "quality");
+        assert_eq!(catalog.revision, 9);
+        assert!(catalog.unavailable_models.is_empty());
+        assert_eq!(
+            catalog.models[0].agent_mode,
+            shared_contracts::llm::AgcAgentMode::Codex
+        );
+        assert_eq!(
+            catalog.models[0].protocol,
+            shared_contracts::llm::AgcModelProtocol::OpenAiResponses
+        );
+    }
+
     #[tokio::test]
     async fn official_catalog_fails_closed_on_http_error_without_accepting_error_as_data() {
         let listener = TcpListener::bind("127.0.0.1:0").expect("bind fixture");