add simple-host example

examples/simple-server/package.json

@@ -4,13 +4,13 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build:uis": "rm -rf dist && concurrently 'UI=ui-raw.html vite build' 'UI=ui-vanilla.html vite build' 'UI=ui-react.html vite build'",
+    "build": "concurrently 'INPUT=ui-raw.html vite build' 'INPUT=ui-vanilla.html vite build' 'INPUT=ui-react.html vite build'",
     "server": "bun server.ts",
-    "start": "npm run build:uis && npm run server"
+    "start": "npm run build && npm run server"
   },
   "dependencies": {
     "@modelcontextprotocol/ext-apps": "../..",
-    "@modelcontextprotocol/sdk": "^1.22.0",
+    "@modelcontextprotocol/sdk": "../../../modelcontextprotocol-typescript-sdk",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "zod": "^3.25.0"

examples/simple-server/src/ui-raw.ts

@@ -8,7 +8,7 @@
  * <code>
  * npx esbuild src/ui-raw.ts --bundle --outfile=dist/ui-raw.js --minify --sourcemap --platform=browser
  * </code>
- * 
+ *
  * We implement a barebones JSON-RPC message sender/receiver (see `app` object below),
  * but without timeouts or runtime type validation of any kind
  * (for that, use the Apps SDK / see ui-vanilla.ts or ui-react.ts).

examples/simple-server/vite.config.ts

@@ -1,16 +1,23 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 import { viteSingleFile } from "vite-plugin-singlefile";
-import { resolve } from "path";
 
-// Get the entry from environment variable, default to ui-react
-const uiPath = process.env.UI;
+const INPUT = process.env.INPUT;
+if (!INPUT) {
+  throw new Error("INPUT environment variable is not set");
+}
+
+const isDevelopment = process.env.NODE_ENV === "development";
 
 export default defineConfig({
   plugins: [react(), viteSingleFile()],
   build: {
+    sourcemap: isDevelopment ? "inline" : undefined,
+    cssMinify: !isDevelopment,
+    minify: !isDevelopment,
+
     rollupOptions: {
-      input: uiPath,
+      input: INPUT,
     },
     outDir: `dist`,
     emptyOutDir: false,