diff --git a/src/plugins/loader.test.ts b/src/plugins/loader.test.ts
index 489ab3ce294..e0399526e7a 100644
--- a/src/plugins/loader.test.ts
+++ b/src/plugins/loader.test.ts
@@ -1,11 +1,18 @@
-import { execFileSync } from "node:child_process";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
-import { createJiti } from "jiti";
 import { afterAll, afterEach, describe, expect, it, vi } from "vitest";
 import { withEnv } from "../test-utils/env.js";
+type CreateJiti = typeof import("jiti").createJiti;
+
+let createJitiPromise: Promise<CreateJiti> | undefined;
+
+async function getCreateJiti() {
+  createJitiPromise ??= import("jiti").then(({ createJiti }) => createJiti);
+  return createJitiPromise;
+}
+
 async function importFreshPluginTestModules() {
   vi.resetModules();
   vi.doUnmock("node:fs");
@@ -3244,42 +3251,24 @@ module.exports = {
       body: `module.exports = {
   id: "legacy-root-import",
   configSchema: (require("openclaw/plugin-sdk").emptyPluginConfigSchema)(),
-  register() {},
-};`,
+        register() {},
+      };`,
     });
 
-    const loaderModuleUrl = pathToFileURL(
-      path.join(process.cwd(), "src", "plugins", "loader.ts"),
-    ).href;
-    const script = `
-      import { loadOpenClawPlugins } from ${JSON.stringify(loaderModuleUrl)};
-      const registry = loadOpenClawPlugins({
+    const registry = withEnv({ OPENCLAW_BUNDLED_PLUGINS_DIR: "/nonexistent/bundled/plugins" }, () =>
+      loadOpenClawPlugins({
         cache: false,
-        workspaceDir: ${JSON.stringify(plugin.dir)},
+        workspaceDir: plugin.dir,
         config: {
           plugins: {
-            load: { paths: [${JSON.stringify(plugin.file)}] },
+            load: { paths: [plugin.file] },
             allow: ["legacy-root-import"],
           },
         },
-      });
-      const record = registry.plugins.find((entry) => entry.id === "legacy-root-import");
-      if (!record || record.status !== "loaded") {
-        console.error(record?.error ?? "legacy-root-import missing");
-        process.exit(1);
-      }
-    `;
-
-    execFileSync(process.execPath, ["--import", "tsx", "--input-type=module", "-e", script], {
-      cwd: process.cwd(),
-      env: {
-        ...process.env,
-        OPENCLAW_HOME: undefined,
-        OPENCLAW_BUNDLED_PLUGINS_DIR: "/nonexistent/bundled/plugins",
-      },
-      encoding: "utf-8",
-      stdio: "pipe",
-    });
+      }),
+    );
+    const record = registry.plugins.find((entry) => entry.id === "legacy-root-import");
+    expect(record?.status).toBe("loaded");
   });
 
   it.each([
@@ -3572,20 +3561,54 @@ module.exports = {
   });
 
   it("loads source runtime shims through the non-native Jiti boundary", async () => {
-    const jiti = createJiti(import.meta.url, {
-      ...__testing.buildPluginLoaderJitiOptions(__testing.resolvePluginSdkScopedAliasMap()),
+    const copiedExtensionRoot = path.join(makeTempDir(), "extensions", "discord");
+    const copiedSourceDir = path.join(copiedExtensionRoot, "src");
+    const copiedPluginSdkDir = path.join(copiedExtensionRoot, "plugin-sdk");
+    mkdirSafe(copiedSourceDir);
+    mkdirSafe(copiedPluginSdkDir);
+    const jitiBaseFile = path.join(copiedSourceDir, "__jiti-base__.mjs");
+    fs.writeFileSync(jitiBaseFile, "export {};\n", "utf-8");
+    fs.writeFileSync(
+      path.join(copiedSourceDir, "channel.runtime.ts"),
+      `import { resolveOutboundSendDep } from "openclaw/plugin-sdk/channel-runtime";
+
+export const syntheticRuntimeMarker = {
+  resolveOutboundSendDep,
+};
+`,
+      "utf-8",
+    );
+    const copiedChannelRuntimeShim = path.join(copiedPluginSdkDir, "channel-runtime.ts");
+    fs.writeFileSync(
+      copiedChannelRuntimeShim,
+      `export function resolveOutboundSendDep() {
+  return "shimmed";
+}
+`,
+      "utf-8",
+    );
+    const copiedChannelRuntime = path.join(copiedExtensionRoot, "src", "channel.runtime.ts");
+    const jitiBaseUrl = pathToFileURL(jitiBaseFile).href;
+
+    const createJiti = await getCreateJiti();
+    const withoutAlias = createJiti(jitiBaseUrl, {
+      ...__testing.buildPluginLoaderJitiOptions({}),
       tryNative: false,
     });
-    const discordChannelRuntime = path.join(
-      process.cwd(),
-      "extensions",
-      "discord",
-      "src",
-      "channel.runtime.ts",
+    await expect(withoutAlias.import(copiedChannelRuntime)).rejects.toThrow(
+      /plugin-sdk\/channel-runtime/,
     );
 
-    await expect(jiti.import(discordChannelRuntime)).resolves.toMatchObject({
-      discordSetupWizard: expect.any(Object),
+    const withAlias = createJiti(jitiBaseUrl, {
+      ...__testing.buildPluginLoaderJitiOptions({
+        "openclaw/plugin-sdk/channel-runtime": copiedChannelRuntimeShim,
+      }),
+      tryNative: false,
+    });
+    await expect(withAlias.import(copiedChannelRuntime)).resolves.toMatchObject({
+      syntheticRuntimeMarker: {
+        resolveOutboundSendDep: expect.any(Function),
+      },
     });
   }, 240_000);
 
@@ -3627,6 +3650,7 @@ export const copiedRuntimeMarker = {
     const copiedChannelRuntime = path.join(copiedExtensionRoot, "src", "channel.runtime.ts");
     const jitiBaseUrl = pathToFileURL(jitiBaseFile).href;
 
+    const createJiti = await getCreateJiti();
     const withoutAlias = createJiti(jitiBaseUrl, {
       ...__testing.buildPluginLoaderJitiOptions({}),
       tryNative: false,