diff --git a/packages/remix-dev/compiler/compiler.ts b/packages/remix-dev/compiler/compiler.ts
index d3c504dff1c..4a1f6016960 100644
--- a/packages/remix-dev/compiler/compiler.ts
+++ b/packages/remix-dev/compiler/compiler.ts
@@ -25,8 +25,6 @@ export let create = async (ctx: Context): Promise<Compiler> => {
     manifest: undefined as unknown as Channel.Type<Manifest>,
   };
 
-  console.log(ctx.options);
-
   let subcompiler = {
     css: await CSS.createCompiler(ctx),
     js: await JS.createCompiler(ctx, channels),
diff --git a/packages/remix-dev/devServer_unstable/index.ts b/packages/remix-dev/devServer_unstable/index.ts
index 552bc60cbe0..c488b8a59a4 100644
--- a/packages/remix-dev/devServer_unstable/index.ts
+++ b/packages/remix-dev/devServer_unstable/index.ts
@@ -34,9 +34,6 @@ export let serve = async (
   } = {};
 
   let startAppServer = (command: string) => {
-    console.log({
-      cwd: process.cwd(),
-    });
     return execa.command(command, {
       stdio: "inherit",
       env: {
@@ -61,7 +58,7 @@ export let serve = async (
       onInitialBuild: (durationMs, manifest) => {
         console.info(`💿 Built in ${prettyMs(durationMs)}`);
         state.prevManifest = manifest;
-        if (options.command) {
+        if (options.command && manifest) {
           console.log(`starting: ${options.command}`);
           state.appServer = startAppServer(options.command);
         }
@@ -74,10 +71,11 @@ export let serve = async (
         if (!manifest) return;
         websocket.log(`Rebuilt in ${prettyMs(durationMs)}`);
 
+        // TODO: should we restart the app server when build failed?
         state.latestBuildHash = manifest.version;
         state.buildHashChannel = Channel.create();
         console.log(`Waiting (${state.latestBuildHash})`);
-        if (options.restart) {
+        if (state.appServer === undefined || options.restart) {
           console.log(`restarting: ${options.command}`);
           state.appServer?.kill();
           if (options.command) {
diff --git a/packages/remix-dev/devServer_unstable/ping.ts b/packages/remix-dev/devServer_unstable/ping.ts
new file mode 100644
index 00000000000..052f9e61d11
--- /dev/null
+++ b/packages/remix-dev/devServer_unstable/ping.ts
@@ -0,0 +1,16 @@
+import type { ServerBuild } from "@remix-run/server-runtime";
+
+export let ping = (build: ServerBuild) => {
+  let httpPort = Number(process.env.REMIX_DEV_HTTP_PORT);
+  if (!httpPort) throw Error("REMIX_DEV_HTTP_PORT not set");
+  if (isNaN(httpPort))
+    throw Error(`REMIX_DEV_HTTP_PORT must be a number. Got: ${httpPort}`);
+
+  fetch(`http://localhost:${httpPort}/ping`, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({ buildHash: build.assets.version }),
+  });
+};
diff --git a/packages/remix-dev/index.ts b/packages/remix-dev/index.ts
index 70796298feb..28e02a58a8e 100644
--- a/packages/remix-dev/index.ts
+++ b/packages/remix-dev/index.ts
@@ -7,3 +7,5 @@ export { createApp } from "./cli/create";
 
 export { type Manifest as AssetsManifest } from "./manifest";
 export { getDependenciesToBundle } from "./dependencies";
+
+export { ping } from "./devServer_unstable/ping";