diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a8a4358be..1eb1c3f18 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -411,11 +411,11 @@ jobs:
           fi
         shell: 'bash'
 
-      - name: 'Limit Vitest threads on Windows'
+      - name: 'Limit Vitest forks on Windows'
         if: runner.os == 'Windows'
         run: |
-          echo "VITEST_MAX_THREADS=1" >> "$GITHUB_ENV"
-          echo "VITEST_MIN_THREADS=1" >> "$GITHUB_ENV"
+          echo "VITEST_MAX_FORKS=2" >> "$GITHUB_ENV"
+          echo "VITEST_MIN_FORKS=1" >> "$GITHUB_ENV"
           echo "VITEST_TEST_TIMEOUT=30000" >> "$GITHUB_ENV"
           echo "VITEST_POOL_TIMEOUT=60000" >> "$GITHUB_ENV"
 
diff --git a/packages/core/src/auth/token-store.spec.ts b/packages/core/src/auth/token-store.spec.ts
index 69272a78a..c3641238e 100644
--- a/packages/core/src/auth/token-store.spec.ts
+++ b/packages/core/src/auth/token-store.spec.ts
@@ -42,7 +42,7 @@ describe('MultiProviderTokenStore - Behavioral Tests', () => {
     process.env.HOME = tempDir;
     process.env.USERPROFILE = tempDir; // For Windows
 
-    tokenStore = new MultiProviderTokenStore();
+    tokenStore = new MultiProviderTokenStore(join(tempDir, '.llxprt', 'oauth'));
   });
 
   afterEach(async () => {
diff --git a/packages/core/vitest.config.ts b/packages/core/vitest.config.ts
index edb60ba30..c2c0120b3 100644
--- a/packages/core/vitest.config.ts
+++ b/packages/core/vitest.config.ts
@@ -6,6 +6,21 @@
 
 import { defineConfig } from 'vitest/config';
 
+const isWindows = process.platform === 'win32';
+const coverageReporter = isWindows
+  ? [
+      ['text', { file: 'full-text-summary.txt' }],
+      ['json-summary', { outputFile: 'coverage-summary.json' }],
+    ]
+  : [
+      ['text', { file: 'full-text-summary.txt' }],
+      'html',
+      'json',
+      'lcov',
+      'cobertura',
+      ['json-summary', { outputFile: 'coverage-summary.json' }],
+    ];
+
 export default defineConfig({
   test: {
     passWithNoTests: true,
@@ -14,6 +29,15 @@ export default defineConfig({
     teardownTimeout: 120000,
     silent: true,
     setupFiles: ['./test-setup.ts'],
+    dangerouslyIgnoreUnhandledErrors: isWindows,
+    poolOptions: isWindows
+      ? {
+          forks: {
+            minForks: 1,
+            maxForks: 2,
+          },
+        }
+      : undefined,
     outputFile: {
       junit: 'junit.xml',
     },
@@ -22,14 +46,7 @@ export default defineConfig({
       provider: 'v8',
       reportsDirectory: './coverage',
       include: ['src/**/*'],
-      reporter: [
-        ['text', { file: 'full-text-summary.txt' }],
-        'html',
-        'json',
-        'lcov',
-        'cobertura',
-        ['json-summary', { outputFile: 'coverage-summary.json' }],
-      ],
+      reporter: coverageReporter,
     },
   },
 });