diff --git a/docs/features/deepseek-harness/technical-design.md b/docs/features/deepseek-harness/technical-design.md
index fd622ad1..7b344f8a 100644
--- a/docs/features/deepseek-harness/technical-design.md
+++ b/docs/features/deepseek-harness/technical-design.md
@@ -338,7 +338,7 @@ GoodBuddy conversationId -> Harness sessionId + process generation
 
 ### 9.4 释放与退出
 
-- 原生能力清单通过一次性 Runtime 探测，取得有界快照后立即 dispose，不得因浏览设置或切换项目把 Host 缓存在执行 Runtime 池中。
+- 原生能力清单由 `SelectedRuntimeManager` 缓存的执行 Runtime 提供，与随后的对话请求共用同一实例，不再为清单单独启动并销毁一次 Host；该实例遵循执行缓存的空闲淘汰、设置变更 reset 和退出 dispose 规则。
 - 删除或释放对话时调用 `goodbuddy/session/release`。
 - Runtime dispose 时先拒绝新请求，再取消所有 Session。
 - Harness Control Plane 完成 Agent、工具和会话清理，Host 完成 Cordis Fiber 与子进程的反向清理。
diff --git a/src/main/agent/selected-runtime-manager.test.ts b/src/main/agent/selected-runtime-manager.test.ts
index 26cbcf22..4a836669 100644
--- a/src/main/agent/selected-runtime-manager.test.ts
+++ b/src/main/agent/selected-runtime-manager.test.ts
@@ -318,13 +318,9 @@ describe('SelectedRuntimeManager', () => {
     await manager.dispose()
   })
 
-  it('disposes a native-inventory runtime without caching it', async () => {
-    const inspected = runtime()
-    const cached = runtime()
-    const create = vi
-      .fn()
-      .mockResolvedValueOnce(inspected.value)
-      .mockResolvedValueOnce(cached.value)
+  it('serves the native inventory from the cached execution runtime', async () => {
+    const shared = runtime()
+    const create = vi.fn(async () => shared.value)
     const manager = new SelectedRuntimeManager(create)
     const selection = { provider: 'opencode' as const }
 
@@ -337,15 +333,42 @@ describe('SelectedRuntimeManager', () => {
       provider: 'opencode',
       inventoryStatus: 'available'
     })
-    expect(inspected.getNativeSnapshot).toHaveBeenCalledOnce()
-    expect(inspected.dispose).toHaveBeenCalledOnce()
+    expect(shared.getNativeSnapshot).toHaveBeenCalledOnce()
+    expect(shared.dispose).not.toHaveBeenCalled()
 
-    await manager.getRuntime(
+    const controller = await manager.getRuntime(
       selection,
       executionSpace('local:project-one')
     )
+    expect(create).toHaveBeenCalledOnce()
+    await expect(controller.getStatus()).resolves.toMatchObject({
+      available: true
+    })
+
+    await manager.getNativeSnapshot(
+      selection,
+      executionSpace('local:project-two')
+    )
     expect(create).toHaveBeenCalledTimes(2)
     await manager.dispose()
+    expect(shared.dispose).toHaveBeenCalled()
+  })
+
+  it('rejects the native inventory when the runtime lacks it', async () => {
+    const plain = runtime()
+    const withoutInventory: AgentRuntime = { ...plain.value }
+    delete withoutInventory.getNativeSnapshot
+    const manager = new SelectedRuntimeManager(
+      vi.fn(async () => withoutInventory)
+    )
+
+    await expect(
+      manager.getNativeSnapshot({
+        provider: 'model',
+        profileId: '00000000-0000-4000-8000-000000000001'
+      })
+    ).rejects.toThrow('当前 Runtime 不支持原生能力清单')
+    await manager.dispose()
   })
 
   it('waits for a pending connection-test runtime during shutdown', async () => {
diff --git a/src/main/agent/selected-runtime-manager.ts b/src/main/agent/selected-runtime-manager.ts
index f37aef4e..c8ed5c7e 100644
--- a/src/main/agent/selected-runtime-manager.ts
+++ b/src/main/agent/selected-runtime-manager.ts
@@ -355,18 +355,11 @@ export class SelectedRuntimeManager implements SelectedRuntimeResolver {
     selection: AgentRuntimeSelection,
     executionSpace?: ExecutionSpaceDescriptor
   ): Promise<RuntimeNativeSnapshot> {
-    const runtime = await this.createRuntime(selection, executionSpace)
-    try {
-      if (this.disposed) {
-        throw new Error('Agent Runtime 正在关闭')
-      }
-      if (!runtime.getNativeSnapshot) {
-        throw new Error('当前 Runtime 不支持原生能力清单')
-      }
-      return await runtime.getNativeSnapshot()
-    } finally {
-      await runtime.dispose()
-    }
+    // The inventory runs on the same cached Runtime that later serves the
+    // conversation, so a slow cold start (embedded OpenCode on Linux ARM)
+    // is paid once instead of once per inventory and again per request.
+    const controller = await this.getRuntime(selection, executionSpace)
+    return controller.getNativeSnapshot()
   }
 
   private async startRetiring(