diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs
index 4e86ef224..3ede10478 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs
@@ -473,12 +473,11 @@ pub(crate) fn normalize_platform_art_asset_generation_kind(kind: &str) -> Option
     })
 }
 
-/// 平台美术生成请求的 `assetKind` → manifest 资源 kind。
+/// 把平台生成适配层收到的 `asset_kind` 映射为 manifest 资产的正式 kind。
 ///
-/// `PlatformArtAssetGenerationOptions::asset_kind` 是**平台请求词汇**（`ui-prototype` /
-/// `art-spritesheet` / `game-background` / `game-art` …），跟 manifest 的正式
-/// `GameCreationAppAssetKind` 不是同一套词表。生成结果登记进 manifest 之前必须在这里显式
-/// 转换，否则 manifest 会落进非 canonical 值，读侧只能靠 shared-contracts 的别名表兜底。
+/// 生成工具的新输入由 `GameCreationAppAssetKind::CANVAS_ASSET_KINDS` 约束；这里保留对
+/// 平台请求值和旧生成账本值的显式映射，只在登记边界转换为 manifest canonical kind，
+/// 避免把平台字段直接写入 `assets[].kind`。
 ///
 /// 词表外的值不猜：返回 `Unknown`，由调用方按既有未知输入口径处理。
 pub(crate) fn platform_art_asset_manifest_kind(asset_kind: &str) -> GameCreationAppAssetKind {
@@ -490,9 +489,8 @@ pub(crate) fn platform_art_asset_manifest_kind(asset_kind: &str) -> GameCreation
         "art-spritesheet" | "icon-spritesheet" => GameCreationAppAssetKind::IconSpritesheet,
         "publication-material" => GameCreationAppAssetKind::PublicationMaterial,
         "game-background" | "scene" => GameCreationAppAssetKind::Scene,
-        // 画板/平台词汇表（`AGENT_RUNTIME_CANVAS_ASSET_KINDS`）到 manifest kind 的**唯一**
-        // 映射点：认不出的原值收口成 `Unknown` 并留痕（回调接到壳层 `app_log!`），
-        // manifest 侧不再有第二张别名表。
+        // 其它平台适配输入也只在这里映射到 manifest kind；认不出的原值收口成 `Unknown`
+        // 并留痕（回调接到壳层 `app_log!`），manifest 侧不再维护第二张别名表。
         _ => GameCreationAppAssetKind::parse_with_context(asset_kind, "canvas.asset_kind"),
     }
 }
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/provider_request_builders.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/provider_request_builders.rs
index b38ed1023..f30084bfd 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/provider_request_builders.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/provider_request_builders.rs
@@ -336,7 +336,11 @@ fn build_game_creator_agent_background_tool_plan_request_at(
         render_game_creator_agent_runtime_steers_for_prompt(root, agent_id, session_id, run_id)?;
     let loop_index = loop_index.saturating_add(1);
     let context_preload_notice = game_creator_agent_context_preload_notice(agent_id);
-    let canvas_asset_kind_catalog = AGENT_RUNTIME_CANVAS_ASSET_KINDS.join("|");
+    let canvas_asset_kind_catalog = AGENT_RUNTIME_CANVAS_ASSET_KINDS
+        .iter()
+        .map(|kind| kind.as_str())
+        .collect::<Vec<_>>()
+        .join("|");
     let limited_command_contract = if runtime_owner_artifact_validation_available {
         "当前固定 owner 不得调用 command.run_limited 或 project.verify；完成固定正式产物后直接交付，由 Runtime 在收束门内执行结构验证。".to_string()
     } else {
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/tool_policy_snapshot.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/tool_policy_snapshot.rs
index 68e315d3d..7c688b2b9 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/tool_policy_snapshot.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_actions/tool_policy_snapshot.rs
@@ -1,7 +1,7 @@
 use super::*;
 
-pub(crate) const AGENT_RUNTIME_CANVAS_ASSET_KINDS: &[&str] =
-    &["game-art", "icon-spec", "ui-prototype", "art-spritesheet"];
+pub(crate) const AGENT_RUNTIME_CANVAS_ASSET_KINDS: &[GameCreationAppAssetKind] =
+    GameCreationAppAssetKind::CANVAS_ASSET_KINDS;
 
 #[cfg(test)]
 mod canvas_asset_kind_contract_tests {
@@ -11,7 +11,12 @@ mod canvas_asset_kind_contract_tests {
     fn canvas_asset_kind_catalog_preserves_authoritative_contract() {
         assert_eq!(
             AGENT_RUNTIME_CANVAS_ASSET_KINDS,
-            &["game-art", "icon-spec", "ui-prototype", "art-spritesheet"]
+            &[
+                GameCreationAppAssetKind::Image,
+                GameCreationAppAssetKind::IconSpec,
+                GameCreationAppAssetKind::UiDesign,
+                GameCreationAppAssetKind::IconSpritesheet,
+            ]
         );
     }
 }
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 6f7aa3441..92fb37f84 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
@@ -16,7 +16,26 @@ pub(crate) const AGENT_RUNTIME_ART_SPEC_PATH: &str = "assets/art-spec.png";
 pub(crate) const AGENT_RUNTIME_ART_SPRITESHEET_PATH: &str = "assets/art-spritesheet.png";
 
 fn agent_runtime_canvas_asset_kind_is_supported(asset_kind: &str) -> bool {
-    AGENT_RUNTIME_CANVAS_ASSET_KINDS.contains(&asset_kind)
+    let parsed = match asset_kind {
+        // 仅用于恢复旧的生成账本；新工具 schema 只暴露 canonical enum 值。
+        "game-art" => GameCreationAppAssetKind::Image,
+        "ui-prototype" => GameCreationAppAssetKind::UiDesign,
+        "art-spritesheet" => GameCreationAppAssetKind::IconSpritesheet,
+        _ => GameCreationAppAssetKind::parse_with_context(asset_kind, "canvas.asset_generate"),
+    };
+    AGENT_RUNTIME_CANVAS_ASSET_KINDS.contains(&parsed)
+}
+
+fn canvas_asset_kind_generation_value(asset_kind: &str) -> Option<&'static str> {
+    match asset_kind.trim() {
+        // 新工具输入使用 GameCreationAppAssetKind 的 canonical 值；生成适配器内部仍
+        // 使用平台请求所需的固定值，直到请求边界完成迁移。
+        "image" | "game-art" => Some("game-art"),
+        "icon-spec" => Some("icon-spec"),
+        "ui-design" | "ui-prototype" => Some("ui-prototype"),
+        "icon-spritesheet" | "art-spritesheet" => Some("art-spritesheet"),
+        _ => None,
+    }
 }
 
 pub(in crate::agent) fn design_foundation_ui_page_output_path_is_valid(path: &str) -> bool {
@@ -543,7 +562,10 @@ pub(in crate::agent) async fn observe_agent_runtime_platform_art_asset_generatio
     let output_path = agent_runtime_tool_input_text(input, &["outputPath", "output_path"]);
     let aspect_ratio = agent_runtime_tool_input_text(input, &["aspectRatio", "aspect_ratio"]);
     let image_size = agent_runtime_tool_input_text(input, &["imageSize", "image_size"]);
-    let asset_kind = agent_runtime_tool_input_text(input, &["assetKind", "asset_kind"]);
+    let requested_asset_kind = agent_runtime_tool_input_text(input, &["assetKind", "asset_kind"]);
+    let asset_kind = canvas_asset_kind_generation_value(&requested_asset_kind)
+        .map(str::to_string)
+        .unwrap_or(requested_asset_kind);
     let asset_label = agent_runtime_tool_input_text(input, &["assetLabel", "asset_label"]);
     let replace_existing = input
         .get("replaceExisting")
@@ -1173,8 +1195,21 @@ mod platform_art_generation_observation_tests {
     #[test]
     fn canvas_asset_kind_validation_accepts_shared_catalog() {
         for asset_kind in AGENT_RUNTIME_CANVAS_ASSET_KINDS {
-            assert!(agent_runtime_canvas_asset_kind_is_supported(asset_kind));
+            assert!(agent_runtime_canvas_asset_kind_is_supported(
+                asset_kind.as_str()
+            ));
         }
+        for legacy_kind in ["game-art", "ui-prototype", "art-spritesheet"] {
+            assert!(agent_runtime_canvas_asset_kind_is_supported(legacy_kind));
+        }
+        assert_eq!(
+            canvas_asset_kind_generation_value("image"),
+            Some("game-art")
+        );
+        assert_eq!(
+            canvas_asset_kind_generation_value("ui-design"),
+            Some("ui-prototype")
+        );
         assert!(!agent_runtime_canvas_asset_kind_is_supported("unsupported"));
     }
 
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent_native_tools.rs b/apps/ai-game-creator-shell/src-tauri/src/agent_native_tools.rs
index 45ba5c505..6ef2ec388 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent_native_tools.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent_native_tools.rs
@@ -1306,7 +1306,7 @@ fn runtime_tool_input_schema(tool: &str) -> Value {
         "canvas.asset_generate" => {
             let mut asset_kinds = AGENT_RUNTIME_CANVAS_ASSET_KINDS
                 .iter()
-                .map(|kind| Value::String((*kind).to_string()))
+                .map(|kind| Value::String(kind.as_str().to_string()))
                 .collect::<Vec<_>>();
             asset_kinds.push(Value::Null);
             json!({
@@ -1867,7 +1867,7 @@ mod tests {
         let schema = runtime_tool_input_schema("canvas.asset_generate");
         let mut expected = AGENT_RUNTIME_CANVAS_ASSET_KINDS
             .iter()
-            .map(|kind| Value::String((*kind).to_string()))
+            .map(|kind| Value::String(kind.as_str().to_string()))
             .collect::<Vec<_>>();
         expected.push(Value::Null);
 
diff --git a/server-rs/crates/shared-contracts/src/game_creation_app/asset_kind.rs b/server-rs/crates/shared-contracts/src/game_creation_app/asset_kind.rs
index 7e41d7872..91ca76794 100644
--- a/server-rs/crates/shared-contracts/src/game_creation_app/asset_kind.rs
+++ b/server-rs/crates/shared-contracts/src/game_creation_app/asset_kind.rs
@@ -70,6 +70,17 @@ macro_rules! game_creation_app_asset_kinds {
             /// 全部变体（末尾是 `Unknown`），按声明顺序。
             pub const ALL: &'static [Self] = &[$(Self::$variant,)+];
 
+            /// `canvas.asset_generate` 当前允许提交的资源 kind 子集。
+            ///
+            /// 工具输入与 manifest 持久化共用同一组 canonical 枚举值，不再维护第二份
+            /// 字符串白名单。工具 schema、prompt 和执行前校验都应从这里派生。
+            pub const CANVAS_ASSET_KINDS: &'static [Self] = &[
+                Self::Image,
+                Self::IconSpec,
+                Self::UiDesign,
+                Self::IconSpritesheet,
+            ];
+
             /// 线上值：kind 字符串表只有这一份，就是上面那张声明表。
             pub const fn as_str(self) -> &'static str {
                 match self {