feat: publish example servers to npm

.github/workflows/npm-publish.yml

@@ -83,3 +83,47 @@ jobs:
       - run: npm publish --provenance --access public ${{ steps.npm-tag.outputs.tag }}
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_SECRET }}
+
+  publish-examples:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release'
+    environment: Release
+    needs: [publish]
+
+    permissions:
+      contents: read
+      id-token: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        example:
+          - basic-server-react
+          - basic-server-vanillajs
+          - budget-allocator-server
+          - cohort-heatmap-server
+          - customer-segmentation-server
+          - scenario-modeler-server
+          - system-monitor-server
+          - threejs-server
+          - wiki-explorer-server
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          registry-url: "https://registry.npmjs.org"
+      - run: npm ci
+
+      - name: Build example
+        run: npm run build --workspace examples/${{ matrix.example }}
+
+      - name: Publish example
+        run: npm publish --workspace examples/${{ matrix.example }} --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_SECRET }}

.github/workflows/publish.yml

@@ -20,4 +20,16 @@ jobs:
           cache: npm
       - run: npm ci
       - run: npm run build
-      - run: npx pkg-pr-new publish
+      - run: npm run examples:build
+      - run: |
+          npx pkg-pr-new publish \
+            . \
+            ./examples/basic-server-react \
+            ./examples/basic-server-vanillajs \
+            ./examples/budget-allocator-server \
+            ./examples/cohort-heatmap-server \
+            ./examples/customer-segmentation-server \
+            ./examples/scenario-modeler-server \
+            ./examples/system-monitor-server \
+            ./examples/threejs-server \
+            ./examples/wiki-explorer-server

examples/basic-server-react/package.json

@@ -1,17 +1,30 @@
 {
-  "name": "basic-server-react",
-  "version": "1.0.0",
-  "private": true,
+  "name": "@modelcontextprotocol/server-basic-react",
+  "version": "0.1.0",
   "type": "module",
+  "description": "Basic MCP App Server example using React",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/modelcontextprotocol/ext-apps",
+    "directory": "examples/basic-server-react"
+  },
+  "license": "MIT",
+  "main": "server.ts",
+  "files": [
+    "server.ts",
+    "server-utils.ts",
+    "dist"
+  ],
   "scripts": {
     "build": "tsc --noEmit && cross-env INPUT=mcp-app.html vite build",
     "watch": "cross-env INPUT=mcp-app.html vite build --watch",
     "serve": "bun server.ts",
     "start": "cross-env NODE_ENV=development npm run build && npm run serve",
-    "dev": "cross-env NODE_ENV=development concurrently 'npm run watch' 'npm run serve'"
+    "dev": "cross-env NODE_ENV=development concurrently 'npm run watch' 'npm run serve'",
+    "prepublishOnly": "npm run build"
   },
   "dependencies": {
-    "@modelcontextprotocol/ext-apps": "../..",
+    "@modelcontextprotocol/ext-apps": "^0.2.2",
     "@modelcontextprotocol/sdk": "^1.24.0",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
@@ -26,6 +39,7 @@
     "@vitejs/plugin-react": "^4.3.4",
     "concurrently": "^9.2.1",
     "cors": "^2.8.5",
+    "cross-env": "^10.1.0",
     "express": "^5.1.0",
     "typescript": "^5.9.3",
     "vite": "^6.0.0",

examples/basic-server-react/server-utils.ts

@@ -0,0 +1,68 @@
+/**
+ * Shared utilities for running MCP servers with Streamable HTTP transport.
+ */
+
+import { createMcpExpressApp } from "@modelcontextprotocol/sdk/server/express.js";
+import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
+import cors from "cors";
+import type { Request, Response } from "express";
+
+export interface ServerOptions {
+  port: number;
+  name?: string;
+}
+
+/**
+ * Starts an MCP server with Streamable HTTP transport in stateless mode.
+ *
+ * @param createServer - Factory function that creates a new McpServer instance per request.
+ * @param options - Server configuration options.
+ */
+export async function startServer(
+  createServer: () => McpServer,
+  options: ServerOptions,
+): Promise<void> {
+  const { port, name = "MCP Server" } = options;
+
+  const app = createMcpExpressApp({ host: "0.0.0.0" });
+  app.use(cors());
+
+  app.all("/mcp", async (req: Request, res: Response) => {
+    const server = createServer();
+    const transport = new StreamableHTTPServerTransport({
+      sessionIdGenerator: undefined,
+    });
+
+    res.on("close", () => {
+      transport.close().catch(() => {});
+      server.close().catch(() => {});
+    });
+
+    try {
+      await server.connect(transport);
+      await transport.handleRequest(req, res, req.body);
+    } catch (error) {
+      console.error("MCP error:", error);
+      if (!res.headersSent) {
+        res.status(500).json({
+          jsonrpc: "2.0",
+          error: { code: -32603, message: "Internal server error" },
+          id: null,
+        });
+      }
+    }
+  });
+
+  const httpServer = app.listen(port, () => {
+    console.log(`${name} listening on http://localhost:${port}/mcp`);
+  });
+
+  const shutdown = () => {
+    console.log("\nShutting down...");
+    httpServer.close(() => process.exit(0));
+  };
+
+  process.on("SIGINT", shutdown);
+  process.on("SIGTERM", shutdown);
+}

examples/basic-server-react/server.ts

@@ -1,58 +1,62 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import type { CallToolResult, ReadResourceResult } from "@modelcontextprotocol/sdk/types.js";
 import fs from "node:fs/promises";
 import path from "node:path";
 import { registerAppTool, registerAppResource, RESOURCE_MIME_TYPE, RESOURCE_URI_META_KEY } from "@modelcontextprotocol/ext-apps/server";
-import { startServer } from "./src/server-utils.js";
+import { startServer } from "./server-utils.js";
 
 const DIST_DIR = path.join(import.meta.dirname, "dist");
 
 /**
  * Creates a new MCP server instance with tools and resources registered.
  */
-function createServer(): McpServer {
+export function createServer(): McpServer {
   const server = new McpServer({
     name: "Basic MCP App Server (React)",
     version: "1.0.0",
   });
 
-  // Two-part registration: tool + resource, tied together by the resource URI.
   const resourceUri = "ui://get-time/mcp-app.html";
 
-  // Register a tool with UI metadata. When the host calls this tool, it reads
-  // `_meta[RESOURCE_URI_META_KEY]` to know which resource to fetch and render
-  // as an interactive UI.
   registerAppTool(server,
     "get-time",
     {
       title: "Get Time",
-      description: "Returns the current server time as an ISO 8601 string.",
+      description: "Returns the current server time.",
       inputSchema: {},
       _meta: { [RESOURCE_URI_META_KEY]: resourceUri },
     },
     async (): Promise<CallToolResult> => {
-      const time = new Date().toISOString();
-      return { content: [{ type: "text", text: time }] };
+      return { content: [{ type: "text", text: new Date().toISOString() }] };
     },
   );
 
-  // Register the resource, which returns the bundled HTML/JavaScript for the UI.
   registerAppResource(server,
     resourceUri,
     resourceUri,
     { mimeType: RESOURCE_MIME_TYPE },
     async (): Promise<ReadResourceResult> => {
       const html = await fs.readFile(path.join(DIST_DIR, "mcp-app.html"), "utf-8");
-
       return {
-        contents: [
-          { uri: resourceUri, mimeType: RESOURCE_MIME_TYPE, text: html },
-        ],
+        contents: [{ uri: resourceUri, mimeType: RESOURCE_MIME_TYPE, text: html }],
       };
     },
   );
 
   return server;
 }
 
-startServer(createServer);
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    await createServer().connect(new StdioServerTransport());
+  } else {
+    const port = parseInt(process.env.PORT ?? "3001", 10);
+    await startServer(createServer, { port, name: "Basic MCP App Server (React)" });
+  }
+}
+
+main().catch((e) => {
+  console.error(e);
+  process.exit(1);
+});