diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..5ae64bf
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,8 @@
+import { defineConfig, configDefaults } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["src/**/*.test.ts"],
+    exclude: [...configDefaults.exclude, "dist/**", "**/.claude/**"],
+  },
+});