diff --git a/package.json b/package.json
index 0d74e13..91d5960 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "scripts": {
     "dev": "wrangler dev",
     "deploy": "wrangler deploy",
-    "test": "vitest run",
+    "test": "vitest run --no-file-parallelism",
     "test:watch": "vitest"
   },
   "repository": {
diff --git a/vitest.config.js b/vitest.config.js
index e9f4a8d..b7c796f 100644
--- a/vitest.config.js
+++ b/vitest.config.js
@@ -8,6 +8,15 @@ export default defineConfig({
       miniflare: {
         // Override remote KV with local-only for tests
         kvNamespaces: ["claude_status"],
+        // Pre-add flags so vitest-pool-workers doesn't emit debug noise
+        compatibilityFlags: [
+          "enable_nodejs_tty_module",
+          "enable_nodejs_fs_module",
+          "enable_nodejs_http_modules",
+          "enable_nodejs_perf_hooks_module",
+          "enable_nodejs_v8_module",
+          "enable_nodejs_process_v2",
+        ],
       },
     }),
   ],