diff --git a/package.json b/package.json
index e37a3172..958d51bf 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
 		"dev": "concurrently --names \"ai,agent,coding-agent,mom,web-ui,tui\" --prefix-colors \"cyan,yellow,red,white,green,magenta\" \"cd packages/ai && npm run dev\" \"cd packages/agent && npm run dev\" \"cd packages/coding-agent && npm run dev\" \"cd packages/mom && npm run dev\" \"cd packages/web-ui && npm run dev\" \"cd packages/tui && npm run dev\"",
 		"dev:tsc": "concurrently --names \"ai,web-ui\" --prefix-colors \"cyan,green\" \"cd packages/ai && npm run dev:tsc\" \"cd packages/web-ui && npm run dev:tsc\"",
 		"check": "biome check --write --error-on-warnings . && tsgo --noEmit && npm run check:browser-smoke && cd packages/web-ui && npm run check",
-		"check:browser-smoke": "sh -c 'esbuild scripts/browser-smoke-entry.ts --bundle --platform=browser --format=esm --log-limit=0 --outfile=/tmp/pi-browser-smoke.js > /tmp/pi-browser-smoke-errors.log 2>&1 || { echo \"Browser smoke check failed. See /tmp/pi-browser-smoke-errors.log\"; exit 1; }'",
+		"check:browser-smoke": "node scripts/check-browser-smoke.mjs",
 		"test": "npm run test --workspaces --if-present",
 		"version:patch": "npm version patch -ws --no-git-tag-version && node scripts/sync-versions.js && shx rm -rf node_modules packages/*/node_modules package-lock.json && npm install",
 		"version:minor": "npm version minor -ws --no-git-tag-version && node scripts/sync-versions.js && shx rm -rf node_modules packages/*/node_modules package-lock.json && npm install",
diff --git a/scripts/check-browser-smoke.mjs b/scripts/check-browser-smoke.mjs
new file mode 100644
index 00000000..d590988d
--- /dev/null
+++ b/scripts/check-browser-smoke.mjs
@@ -0,0 +1,36 @@
+import { writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { build } from "esbuild";
+
+const outputPath = join(tmpdir(), "pi-browser-smoke.js");
+const errorLogPath = join(tmpdir(), "pi-browser-smoke-errors.log");
+
+try {
+	await build({
+		entryPoints: ["scripts/browser-smoke-entry.ts"],
+		bundle: true,
+		platform: "browser",
+		format: "esm",
+		logLevel: "silent",
+		outfile: outputPath,
+	});
+	process.exit(0);
+} catch (error) {
+	let detailedErrors = "";
+	if (error && typeof error === "object" && "errors" in error && Array.isArray(error.errors)) {
+		detailedErrors = error.errors
+			.map((entry) => {
+				const location = entry.location
+					? `${entry.location.file}:${entry.location.line}:${entry.location.column}`
+					: "";
+				return [location, entry.text].filter(Boolean).join(" ");
+			})
+			.join("\n");
+	}
+
+	const baseError = error instanceof Error ? (error.stack ?? error.message) : String(error);
+	writeFileSync(errorLogPath, [detailedErrors, baseError].filter(Boolean).join("\n\n"), "utf-8");
+	console.error(`Browser smoke check failed. See ${errorLogPath}`);
+	process.exit(1);
+}