diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs
index 1968de198..c3890466a 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs
@@ -618,7 +618,12 @@ pub(in crate::agent) async fn observe_agent_runtime_platform_art_asset_generatio
             } else {
                 requested_options.image_size
             },
-            asset_kind: if requested_options.asset_kind.is_empty() {
+            // kind 已是枚举，「空串」不再可表达：只有工具入参**没有**声明 assetKind（空白）才落
+            // 本通道默认值。显式给了认不出的值仍是 `Unknown`，继续在下游按「不受支持」失败关闭，
+            // 不做兜底猜测。
+            asset_kind: if requested_options.asset_kind == GameCreationAppAssetKind::Unknown
+                && requested_asset_kind.trim().is_empty()
+            {
                 defaults.asset_kind
             } else {
                 requested_options.asset_kind
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
index 7beeb6825..5140233a1 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
@@ -3409,7 +3409,7 @@ async fn generate_local_project_asset_command_lands_the_requested_target_categor
 }
 
 #[tokio::test]
-async fn generate_local_project_asset_command_maps_spec_onto_the_verified_icon_spec_channel() {
+async fn generate_local_project_asset_command_registers_icon_spec_with_the_spec_generation_kind() {
     let root = unique_project_path();
     let config_dir = unique_project_path();
     let base_url = spawn_mock_external_canvas_generation_api_server(None);
@@ -3436,7 +3436,7 @@ async fn generate_local_project_asset_command_maps_spec_onto_the_verified_icon_s
 
     let asset = generate_local_project_asset(
         root.to_string_lossy().into_owned(),
-        "spec".to_string(),
+        "icon-spec".to_string(),
         "原创收集玩法的统一视觉规范".to_string(),
         None,
         None,
@@ -3457,7 +3457,7 @@ async fn generate_local_project_asset_command_maps_spec_onto_the_verified_icon_s
         .iter()
         .find(|entry| entry["id"].as_str() == Some(asset.id.as_str()))
         .expect("registered toolbar spec asset");
-    // spec 必须收口到客户端验证过的 icon-spec，否则规范图无法作为 UI 原型与透明图集的权威参考。
+    // 工具栏直接给 canonical kind；平台请求词汇 `spec` 只出现在 generationKind，不再参与登记。
     assert_eq!(entry["kind"], "icon-spec");
     assert_eq!(entry["source"]["generationKind"], "spec");
     assert_eq!(
@@ -3476,7 +3476,8 @@ async fn generate_local_project_asset_command_maps_spec_onto_the_verified_icon_s
 }
 
 #[tokio::test]
-async fn generate_local_project_asset_command_generates_art_spritesheet_from_the_registered_spec() {
+async fn generate_local_project_asset_command_generates_icon_spritesheet_from_the_registered_spec()
+{
     let root = unique_project_path();
     let config_dir = unique_project_path();
     let base_url = spawn_mock_external_canvas_generation_api_server(None);
@@ -3504,7 +3505,7 @@ async fn generate_local_project_asset_command_generates_art_spritesheet_from_the
     // 透明图集必须有权威规范图：没有已登记的 icon-spec 时必须明确失败，不能静默降级成普通图。
     let missing_reference = generate_local_project_asset(
         root.to_string_lossy().into_owned(),
-        "art-spritesheet".to_string(),
+        "icon-spritesheet".to_string(),
         "原创收集玩法素材图集".to_string(),
         None,
         None,
@@ -3533,7 +3534,7 @@ async fn generate_local_project_asset_command_generates_art_spritesheet_from_the
 
     let asset = generate_local_project_asset(
         root.to_string_lossy().into_owned(),
-        "art-spritesheet".to_string(),
+        "icon-spritesheet".to_string(),
         "原创收集玩法素材图集".to_string(),
         Some("1:1".to_string()),
         Some("1K".to_string()),
@@ -3555,7 +3556,7 @@ async fn generate_local_project_asset_command_generates_art_spritesheet_from_the
         .iter()
         .find(|entry| entry["id"].as_str() == Some(asset.id.as_str()))
         .expect("registered toolbar spritesheet asset");
-    // 平台请求词汇 `art-spritesheet` 登记时收口成正式成员 `icon-spritesheet`。
+    // 工具栏直接给 canonical kind；平台请求词汇 `icon-spritesheet` 只出现在 generationKind。
     assert_eq!(entry["kind"], "icon-spritesheet");
     assert_eq!(
         entry["source"]["generationRoute"],