diff --git a/extensions/vydra/image-generation-provider.test.ts b/extensions/vydra/image-generation-provider.test.ts
index be34a4148a6..90ab61df727 100644
--- a/extensions/vydra/image-generation-provider.test.ts
+++ b/extensions/vydra/image-generation-provider.test.ts
@@ -1,8 +1,11 @@
 import * as providerAuth from "openclaw/plugin-sdk/provider-auth-runtime";
+import { installPinnedHostnameTestHooks } from "openclaw/plugin-sdk/testing";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { buildVydraImageGenerationProvider } from "./image-generation-provider.js";
 
 describe("vydra image-generation provider", () => {
+  installPinnedHostnameTestHooks();
+
   afterEach(() => {
     vi.unstubAllGlobals();
     vi.restoreAllMocks();
diff --git a/extensions/vydra/speech-provider.test.ts b/extensions/vydra/speech-provider.test.ts
index 7a1b428f5ae..4a0370ea996 100644
--- a/extensions/vydra/speech-provider.test.ts
+++ b/extensions/vydra/speech-provider.test.ts
@@ -1,7 +1,10 @@
+import { installPinnedHostnameTestHooks } from "openclaw/plugin-sdk/testing";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { buildVydraSpeechProvider } from "./speech-provider.js";
 
 describe("vydra speech provider", () => {
+  installPinnedHostnameTestHooks();
+
   const provider = buildVydraSpeechProvider();
 
   afterEach(() => {
diff --git a/extensions/vydra/video-generation-provider.test.ts b/extensions/vydra/video-generation-provider.test.ts
index 0205403d017..f61a7da4de0 100644
--- a/extensions/vydra/video-generation-provider.test.ts
+++ b/extensions/vydra/video-generation-provider.test.ts
@@ -1,8 +1,11 @@
 import * as providerAuth from "openclaw/plugin-sdk/provider-auth-runtime";
+import { installPinnedHostnameTestHooks } from "openclaw/plugin-sdk/testing";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { buildVydraVideoGenerationProvider } from "./video-generation-provider.js";
 
 describe("vydra video-generation provider", () => {
+  installPinnedHostnameTestHooks();
+
   afterEach(() => {
     vi.unstubAllGlobals();
     vi.restoreAllMocks();
diff --git a/test/vitest/vitest.contracts.config.ts b/test/vitest/vitest.contracts.config.ts
index a9d0f5bf80c..eacb6ce8981 100644
--- a/test/vitest/vitest.contracts.config.ts
+++ b/test/vitest/vitest.contracts.config.ts
@@ -10,6 +10,10 @@ export function createContractsVitestConfig() {
     test: {
       ...baseTest,
       isolate: false,
+      // The contracts shard intentionally runs non-isolated and loads hundreds of
+      // contract files. Use forks so full-suite parallel runs do not hit
+      // Vitest worker-thread heap limits.
+      pool: "forks",
       runner: nonIsolatedRunnerPath,
       setupFiles: baseTest.setupFiles ?? [],
       include: [