diff --git a/dev-server-mcp/services.localhost.json b/dev-server-mcp/services.localhost.json
new file mode 100644
index 0000000..70b2404
--- /dev/null
+++ b/dev-server-mcp/services.localhost.json
@@ -0,0 +1,28 @@
+{
+  "_comment": [
+    "A first end-to-end configuration, deliberately dependency-free.",
+    "",
+    "'node-app' runs whatever server.js the execution wrote, with node alone and no install step.",
+    "That is the point: npm ci needs a lockfile, so the shortest honest loop for an agent starting",
+    "from an empty directory is a server built on node's own http module. Once that works, move to",
+    "services.example.json, where execution-web installs a real dependency tree.",
+    "",
+    "The service reads its port from PORT as well as from the argument, because an agent writing a",
+    "server from scratch is more likely to reach for process.env.PORT than to parse argv."
+  ],
+  "services": {
+    "node-app": {
+      "command": "node",
+      "args": ["server.js", "${port}"],
+      "cwd": ".",
+      "workspaceMode": "execution",
+      "publicUrl": "http://dev-server-worker:${port}",
+      "healthUrl": "http://127.0.0.1:${port}/",
+      "startupTimeoutMs": 20000,
+      "shutdownTimeoutMs": 5000,
+      "env": {
+        "PORT": "${port}"
+      }
+    }
+  }
+}