diff --git a/apps/ai-game-creator-shell/scripts/stage-node-runtime.mjs b/apps/ai-game-creator-shell/scripts/stage-node-runtime.mjs
index 9b6c5a934..e2fe1b8d1 100644
--- a/apps/ai-game-creator-shell/scripts/stage-node-runtime.mjs
+++ b/apps/ai-game-creator-shell/scripts/stage-node-runtime.mjs
@@ -132,7 +132,9 @@ export function runtimeSourceForTarget(
   }
   return {
     nodePath: configured,
-    npmCli: undefined,
+    // 明令不使用宿主 npm（`npm_execpath`）：另一架构的 npm 必须来自它自己那份发行版
+    // 安装目录，否则两份切片的 npm 来源不同源，架构与来源对不上。null 表示"按 node 目录查找"。
+    npmCli: null,
     licensePath: env[`AGC_NODE_RUNTIME_${key}_LICENSE_PATH`]?.trim(),
   };
 }
@@ -372,6 +374,7 @@ export function inspectRuntimeSource(
     );
   }
   const nodeDirectory = path.dirname(node);
+  // `npmCli: null` 表示显式拒绝沿用宿主 npm，只按这份 node 自己的安装目录查找。
   const npmCandidates = [
     npmCli,
     path.join(nodeDirectory, 'node_modules/npm/bin/npm-cli.js'),
diff --git a/apps/ai-game-creator-shell/scripts/stage-node-runtime.test.mjs b/apps/ai-game-creator-shell/scripts/stage-node-runtime.test.mjs
index 23836fe21..c42ee8754 100644
--- a/apps/ai-game-creator-shell/scripts/stage-node-runtime.test.mjs
+++ b/apps/ai-game-creator-shell/scripts/stage-node-runtime.test.mjs
@@ -376,10 +376,20 @@ test('universal stages one runtime per architecture with architecture-correct ma
       'aarch64-apple-darwin',
       'x86_64-apple-darwin',
     ]);
-    const manifests = stageNodeRuntimeForTarget(
-      'universal-apple-darwin',
-      optionsFor(root, sources),
-    );
+    // 模拟经 `npm run` 触发的构建：npm 把宿主的 npm-cli.js 放进环境变量。
+    // 另一架构的切片必须无视它，只能使用自己发行版目录里的 npm。
+    const previousNpmExecPath = process.env.npm_execpath;
+    process.env.npm_execpath = sources.arm64.npmCli;
+    let manifests;
+    try {
+      manifests = stageNodeRuntimeForTarget(
+        'universal-apple-darwin',
+        optionsFor(root, sources),
+      );
+    } finally {
+      if (previousNpmExecPath === undefined) delete process.env.npm_execpath;
+      else process.env.npm_execpath = previousNpmExecPath;
+    }
     assert.deepEqual(
       manifests.map((manifest) => `${manifest.platform}-${manifest.arch}`),
       ['darwin-arm64', 'darwin-x64'],
@@ -400,6 +410,14 @@ test('universal stages one runtime per architecture with architecture-correct ma
       assert.ok(
         fs.existsSync(path.join(directory, 'node_modules/npm/LICENSE')),
       );
+      // 每份切片必须自带对应架构发行版的 npm，不能借用宿主那一份。
+      assert.equal(
+        fs.readFileSync(
+          path.join(directory, 'node_modules/npm/bin/npm-cli.js'),
+          'utf8',
+        ),
+        `// ${manifest.arch}`,
+      );
     }
     // 单架构目标仍写扁平目录（与既有发布一致），不产生分架构子目录。
     const flat = stageNodeRuntimeForTarget(