diff --git a/src/web/vite.config.ts b/src/web/vite.config.ts
index 9de9b3e..941a628 100644
--- a/src/web/vite.config.ts
+++ b/src/web/vite.config.ts
@@ -37,5 +37,6 @@ export default defineConfig({
     environment: 'jsdom',
     globals: true,
     setupFiles: ['./tests/setup.ts'],
+    include: ['tests/**/*.test.{ts,tsx}'],
   },
 });
diff --git a/src/web/vitest.config.ts b/src/web/vitest.config.ts
new file mode 100644
index 0000000..6d8b16b
--- /dev/null
+++ b/src/web/vitest.config.ts
@@ -0,0 +1,14 @@
+/// <reference types="vitest/config" />
+import { defineProject } from 'vitest/config';
+import react from '@vitejs/plugin-react';
+
+export default defineProject({
+  plugins: [react()],
+  test: {
+    name: 'web',
+    include: ['tests/**/*.test.{ts,tsx}'],
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['./tests/setup.ts'],
+  },
+});
diff --git a/vitest.config.ts b/vitest.config.ts
index ee87406..a1c7953 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -9,8 +9,20 @@ export default defineConfig({
       exclude: ['**/node_modules/**', '**/dist/**', '**/*.config.*'],
     },
     include: ['src/*/tests/**/*.test.ts', 'tests/**/*.test.ts'],
-    exclude: ['**/node_modules/**', '**/smoke/**', 'src/db/tests/**'],
+    // src/web tests need jsdom; they're run via the web package's own
+    // vitest.config.ts under the projects entry below.
+    exclude: ['**/node_modules/**', '**/smoke/**', 'src/db/tests/**', 'src/web/tests/**'],
     testTimeout: 10000,
+    // Vitest 4 uses `projects` (in-config) instead of vitest.workspace.ts.
+    // Each project below is rooted in a workspace package; vitest reads
+    // its `vitest.config.ts` (or vite.config.ts) for the test config.
+    projects: [
+      'src/shared',
+      'src/cli',
+      'src/mcpd',
+      'src/mcplocal',
+      'src/web',
+    ],
     // DB tests require a test database; run them explicitly via:
     //   pnpm --filter db exec vitest run
     // globalSetup: ['src/db/tests/global-setup.ts'],
diff --git a/vitest.workspace.ts b/vitest.workspace.ts
index 62873a7..aef3380 100644
--- a/vitest.workspace.ts
+++ b/vitest.workspace.ts
@@ -6,4 +6,8 @@ export default defineWorkspace([
   'src/cli',
   'src/mcpd',
   'src/mcplocal',
+  // src/web has its own vite.config.ts with `environment: 'jsdom'` —
+  // listing it here makes the workspace runner pick that up so the
+  // browser-y tests get the right globals (localStorage, document).
+  'src/web',
 ]);