Add missing refresh-stats tool to system-monitor-server

The `mcp-app.ts` UI was calling a `refresh-stats` tool that didn't exist
on the server, causing the example to fail. This was introduced in
PR #131 when the squash merge included the client-side change but lost
the server-side tool registration.

Fixes #200

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

examples/system-monitor-server/server.ts

@@ -107,6 +107,30 @@ async function getMemoryStats(): Promise<MemoryStats> {
   };
 }
 
+async function getStats(): Promise<SystemStats> {
+  const cpuSnapshots = getCpuSnapshots();
+  const cpuInfo = os.cpus()[0];
+  const memory = await getMemoryStats();
+  const uptimeSeconds = os.uptime();
+
+  return {
+    cpu: {
+      cores: cpuSnapshots,
+      model: cpuInfo?.model ?? "Unknown",
+      count: os.cpus().length,
+    },
+    memory,
+    system: {
+      hostname: os.hostname(),
+      platform: `${os.platform()} ${os.arch()}`,
+      arch: os.arch(),
+      uptime: uptimeSeconds,
+      uptimeFormatted: formatUptime(uptimeSeconds),
+    },
+    timestamp: new Date().toISOString(),
+  };
+}
+
 export function createServer(): McpServer {
   const server = new McpServer({
     name: "System Monitor Server",
@@ -128,28 +152,27 @@ export function createServer(): McpServer {
       _meta: { [RESOURCE_URI_META_KEY]: resourceUri },
     },
     async (): Promise<CallToolResult> => {
-      const cpuSnapshots = getCpuSnapshots();
+      const stats = await getStats();
-      const cpuInfo = os.cpus()[0];
+      return {
-      const memory = await getMemoryStats();
+        content: [{ type: "text", text: JSON.stringify(stats) }],
-      const uptimeSeconds = os.uptime();
+        structuredContent: stats,
-
-      const stats: SystemStats = {
-        cpu: {
-          cores: cpuSnapshots,
-          model: cpuInfo?.model ?? "Unknown",
-          count: os.cpus().length,
-        },
-        memory,
-        system: {
-          hostname: os.hostname(),
-          platform: `${os.platform()} ${os.arch()}`,
-          arch: os.arch(),
-          uptime: uptimeSeconds,
-          uptimeFormatted: formatUptime(uptimeSeconds),
-        },
-        timestamp: new Date().toISOString(),
       };
+    },
+  );
 
+  // App-only tool for polling - used by the UI for periodic refresh
+  registerAppTool(
+    server,
+    "refresh-stats",
+    {
+      title: "Refresh Stats",
+      description: "Refresh system statistics (app-only, for polling)",
+      inputSchema: {},
+      outputSchema: SystemStatsSchema.shape,
+      _meta: { ui: { visibility: ["app"] } },
+    },
+    async (): Promise<CallToolResult> => {
+      const stats = await getStats();
       return {
         content: [{ type: "text", text: JSON.stringify(stats) }],
         structuredContent: stats,

package-lock.json

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