test(cloudflare): align test runtime with Wrangler

packages/mcp-cloudflare/package.json

@@ -31,7 +31,7 @@
   },
   "devDependencies": {
     "@cloudflare/vite-plugin": "^1.13.15",
-    "@cloudflare/vitest-pool-workers": "catalog:",
+    "@cloudflare/vitest-plugin": "catalog:",
     "@cloudflare/workers-types": "catalog:",
     "@sentry/mcp-core": "workspace:*",
     "@sentry/mcp-server-mocks": "workspace:*",
@@ -45,6 +45,7 @@
     "@vitejs/plugin-react": "catalog:",
     "tailwindcss": "catalog:",
     "urlpattern-polyfill": "^10.1.0",
+    "undici": "^7.24.4",
     "vite": "catalog:",
     "vitest": "catalog:",
     "miniflare": "catalog:",

packages/mcp-cloudflare/src/test-utils/configure-fetch-mock.ts

@@ -1,12 +1,16 @@
-import { createFetchMock } from "miniflare";
+import { Response, type V4FetchHandler } from "miniflare";
+import { fetch, MockAgent } from "undici";
 import {
   registerFetchMockInterceptors,
   type FetchMockLike,
 } from "./fetch-mock-setup";
 
-export function createConfiguredFetchMock(): FetchMockLike {
-  const fetchMock = createFetchMock() as FetchMockLike;
+export function createMockOutboundService(): V4FetchHandler {
+  const fetchMock = new MockAgent();
   fetchMock.disableNetConnect();
-  registerFetchMockInterceptors(fetchMock);
-  return fetchMock;
+  registerFetchMockInterceptors(fetchMock as FetchMockLike);
+  return async (request) => {
+    const response = await fetch(request, { dispatcher: fetchMock });
+    return new Response(response.body, response);
+  };
 }

packages/mcp-cloudflare/src/test-utils/fetch-mock-setup.ts

@@ -1,7 +1,7 @@
 /**
  * Shared outbound mock registrations for Cloudflare Workers tests.
  *
- * The current vitest-pool-workers stack configures Miniflare's `fetchMock`
+ * The Cloudflare Vitest plugin configures Miniflare's `outboundService`
  * centrally from vitest.config.ts so test files do not need per-file setup.
  */
 import {

packages/mcp-cloudflare/tsconfig.test.json

@@ -3,7 +3,7 @@
   "compilerOptions": {
     "types": [
       "@cloudflare/workers-types",
-      "@cloudflare/vitest-pool-workers"
+      "@cloudflare/vitest-plugin"
     ]
   },
   "include": [

packages/mcp-cloudflare/vitest.config.ts

@@ -1,14 +1,14 @@
 import path from "node:path";
-import { cloudflareTest } from "@cloudflare/vitest-pool-workers";
+import { cloudflareTest } from "@cloudflare/vitest-plugin";
 import { defineConfig } from "vitest/config";
-import { createConfiguredFetchMock } from "./src/test-utils/configure-fetch-mock";
+import { createMockOutboundService } from "./src/test-utils/configure-fetch-mock";
 
 /**
- * Unified vitest config using vitest-pool-workers.
+ * Unified vitest config using the Cloudflare Vitest plugin.
  *
  * All tests run in the Cloudflare Workers runtime (workerd) which enables:
  * - Testing with cloudflare:test bindings (KV, AI, etc.)
- * - Using fetchMock from cloudflare:test for HTTP mocking
+ * - Using centrally registered outbound HTTP fixtures
  *
  * Bindings (KV, vars, compatibility flags) are defined in wrangler.test.jsonc
  * to keep test config aligned with production wrangler.jsonc.
@@ -18,7 +18,7 @@ export default defineConfig({
     cloudflareTest({
       main: "./src/server/index.ts",
       miniflare: {
-        fetchMock: createConfiguredFetchMock(),
+        outboundService: createMockOutboundService(),
       },
       wrangler: { configPath: "./wrangler.test.jsonc" },
     }),