diff --git a/engine/include/XCEngine/Rendering/AGENTS.md b/engine/include/XCEngine/Rendering/AGENTS.md
index f1a8d383..3aa9da6c 100644
--- a/engine/include/XCEngine/Rendering/AGENTS.md
+++ b/engine/include/XCEngine/Rendering/AGENTS.md
@@ -33,11 +33,13 @@ SceneRenderer
 - managed 侧产品骨架仍是：
   `ScriptableRenderPipelineAsset -> ScriptableRendererData -> ScriptableRenderer -> ScriptableRendererFeature/Pass`
 - builtin 和 SRP 现在都必须是显式可切换的顶层路径，而不是“SRP 隐式优先，builtin 只是兜底”。
+- `ScriptableRenderPipelineHost` 里的 native backend 是 managed SRP 的绘制后端，不是 SRP stage 录制失败时的顶层兜底。
 
 ## 5. 当前硬边界
 - `RenderPipelineFactory` 在无显式 asset、无托管配置、创建失败回退时，都必须先回 builtin，而不是回 `ScriptableRenderPipelineHost`。
 - `MonoScriptRuntime::OnRuntimeStart()` 不得隐式写入 render pipeline 选择。
 - builtin 私有 native feature 通道只能留在 native 内部使用。
+- managed SRP runtime 或 stage recorder 存在时，stage 组织权归 managed SRP；native backend 不得在 host 层隐式接管 `RecordStageRenderGraph`、`Render(...)` 或 scene-pass standalone stage。
 - 下列能力不得再暴露给 managed / URP 公开层：
   `NativeSceneFeaturePassId`
   `ScriptableRenderContext.RecordNativeSceneFeaturePass(...)`
@@ -66,6 +68,7 @@ SceneRenderer
 - 不要再把 builtin 私有 native feature 包成 public managed API 方便调用。
 - 不要再让 “null 选择” 默认落到 `ScriptableRenderPipelineHost`。
 - 不要把非通用产品层策略继续直接塞回 `BuiltinForwardPipeline`。
+- 不要让 `ScriptableRenderPipelineHost` 在 managed SRP 未支持或未录制某个 stage 时自动回退到 native backend；需要绘制时应通过 managed `ScriptableRenderContext` 显式调用 native draw 能力。
 
 ## 8. 关键文件
 - `engine/src/Rendering/Internal/RenderPipelineFactory.cpp`
diff --git a/engine/src/Rendering/Pipelines/ScriptableRenderPipelineHost.cpp b/engine/src/Rendering/Pipelines/ScriptableRenderPipelineHost.cpp
index 44eb7c25..7023acd0 100644
--- a/engine/src/Rendering/Pipelines/ScriptableRenderPipelineHost.cpp
+++ b/engine/src/Rendering/Pipelines/ScriptableRenderPipelineHost.cpp
@@ -14,6 +14,13 @@ std::shared_ptr<const RenderPipelineAsset> CreateDefaultPipelineBackendAsset() {
     return Rendering::Internal::CreateDefaultPipelineBackendAsset();
 }
 
+bool UsesAuthoritativeStageRecorder(
+    const RenderPipelineStageRecorder* stageRecorder,
+    const ManagedRenderPipelineAssetRuntime* managedAssetRuntime) {
+    return stageRecorder != nullptr ||
+           managedAssetRuntime != nullptr;
+}
+
 } // namespace
 
 ScriptableRenderPipelineHost::ScriptableRenderPipelineHost()
@@ -103,6 +110,10 @@ bool ScriptableRenderPipelineHost::SupportsStageRenderGraph(
         return m_stageRecorder->SupportsStageRenderGraph(context);
     }
 
+    if (m_managedAssetRuntime != nullptr) {
+        return false;
+    }
+
     return m_pipelineBackend != nullptr &&
            m_pipelineBackend->SupportsStageRenderGraph(context);
 }
@@ -117,9 +128,12 @@ bool ScriptableRenderPipelineHost::RecordStageRenderGraph(
         const RenderPipelineStageSupportContext supportContext = {
             context.stage,
             context.rendererIndex };
-        if (m_stageRecorder->SupportsStageRenderGraph(supportContext)) {
-            return m_stageRecorder->RecordStageRenderGraph(context);
-        }
+        return m_stageRecorder->SupportsStageRenderGraph(supportContext) &&
+               m_stageRecorder->RecordStageRenderGraph(context);
+    }
+
+    if (m_managedAssetRuntime != nullptr) {
+        return false;
     }
 
     return m_pipelineBackend != nullptr &&
@@ -128,6 +142,12 @@ bool ScriptableRenderPipelineHost::RecordStageRenderGraph(
 
 bool ScriptableRenderPipelineHost::Render(
     const FrameExecutionContext& executionContext) {
+    if (UsesAuthoritativeStageRecorder(
+            m_stageRecorder.get(),
+            m_managedAssetRuntime.get())) {
+        return false;
+    }
+
     if (!EnsureInitialized(executionContext.renderContext)) {
         return false;
     }
@@ -140,6 +160,12 @@ bool ScriptableRenderPipelineHost::Render(
     const RenderContext& context,
     const RenderSurface& surface,
     const RenderSceneData& sceneData) {
+    if (UsesAuthoritativeStageRecorder(
+            m_stageRecorder.get(),
+            m_managedAssetRuntime.get())) {
+        return false;
+    }
+
     if (!EnsureInitialized(context)) {
         return false;
     }
@@ -186,12 +212,10 @@ bool ScriptableRenderPipelineHost::ConfigureDirectionalShadowExecutionState(
 RenderPass* ScriptableRenderPipelineHost::GetCameraFrameStandalonePass(
     CameraFrameStage stage,
     int32_t rendererIndex) const {
-    if (m_managedAssetRuntime != nullptr &&
-        IsCameraFrameScenePassRequestStage(stage) &&
-        SupportsStageRenderGraph(
-            RenderPipelineStageSupportContext{
-                stage,
-                rendererIndex })) {
+    if (UsesAuthoritativeStageRecorder(
+            m_stageRecorder.get(),
+            m_managedAssetRuntime.get()) &&
+        IsCameraFrameScenePassRequestStage(stage)) {
         return nullptr;
     }