diff --git a/apps/server/package.json b/apps/server/package.json
index 950079a4dc..6f9f33d9aa 100644
--- a/apps/server/package.json
+++ b/apps/server/package.json
@@ -15,7 +15,7 @@
   ],
   "type": "module",
   "scripts": {
-    "dev": "bun run src/bin.ts",
+    "dev": "tsx src/bin.ts",
     "build": "node scripts/cli.ts build",
     "start": "node dist/bin.mjs",
     "prepare": "effect-language-service patch",
@@ -41,6 +41,7 @@
     "@types/bun": "catalog:",
     "@types/node": "catalog:",
     "tsdown": "catalog:",
+    "tsx": "^4.20.6",
     "typescript": "catalog:",
     "vitest": "catalog:"
   },
diff --git a/bun.lock b/bun.lock
index 0c95792b69..4f15d0cb9e 100644
--- a/bun.lock
+++ b/bun.lock
@@ -65,6 +65,7 @@
         "@types/bun": "catalog:",
         "@types/node": "catalog:",
         "tsdown": "catalog:",
+        "tsx": "^4.20.6",
         "typescript": "catalog:",
         "vitest": "catalog:",
       },
diff --git a/scripts/package-scripts.test.ts b/scripts/package-scripts.test.ts
new file mode 100644
index 0000000000..de1a4c7b1c
--- /dev/null
+++ b/scripts/package-scripts.test.ts
@@ -0,0 +1,24 @@
+import { readFileSync } from "node:fs";
+import path from "node:path";
+import { assert, describe, it } from "@effect/vitest";
+
+function readPackageScripts(relativePath: string): Record<string, string> {
+  const packageJsonPath = path.resolve(import.meta.dirname, "..", relativePath);
+  const packageJson = JSON.parse(readFileSync(packageJsonPath, "utf8")) as {
+    scripts?: Record<string, string>;
+  };
+
+  return packageJson.scripts ?? {};
+}
+
+describe("package scripts", () => {
+  it("uses a Node-compatible TypeScript runner for the server dev script", () => {
+    const scripts = readPackageScripts("apps/server/package.json");
+
+    assert.equal(
+      scripts.dev,
+      "tsx src/bin.ts",
+      `apps/server dev script should use the exact Windows-safe runtime entrypoint: ${scripts.dev}`,
+    );
+  });
+});