Merge pull request modelcontextprotocol#334 from m-paternostro/mp/notifier

Capability notification for the MCP Server

Author: cliffhall

src/examples/server/simpleStreamableHttp.ts

@@ -12,6 +12,21 @@ const server = new McpServer({
  version: '1.0.0',
 }, { capabilities: { logging: {} } });
 
+// Log the capability invocation details
+server.onCapabilityChange((event) => {
+ switch (event.action) {
+ case 'invoked':
+ console.log(`${event.capabilityType} invocation ${event.invocationIndex}: '${event.capabilityName}' started`);
+ break;
+ case 'completed':
+ console.log(`${event.capabilityType} invocation ${event.invocationIndex}: '${event.capabilityName}' completed in ${event.durationMs}ms`);
+ break;
+ case 'error':
+ console.log(`${event.capabilityType} invocation ${event.invocationIndex}: '${event.capabilityName}' failed in ${event.durationMs}ms: ${event.error}`);
+ break;
+ }
+});
+
 // Register a simple tool that returns a greeting
 server.tool(
  'greet',
@@ -291,4 +306,4 @@ process.on('SIGINT', async () => {
  await server.close();
  console.log('Server shutdown complete');
  process.exit(0);
-});
+});

src/server/index.ts

@@ -104,6 +104,13 @@ export class Server<
  );
  }
 
+ /**
+ * The server's name and version.
+ */
+ getVersion(): { readonly name: string; readonly version: string } {
+ return this._serverInfo;
+ }
+
  /**
  * Registers new capabilities. This can only be called before connecting to a transport.
  *