MCP Server

import { Client } from "@modelcontextprotocol/sdk/client/index.js"; import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js"; import path from "path"; // Import path module import { fileURLToPath } from "url"; // Helper for __dirname in ESM // Helper to get directory name in ES Modules const __filename = fileURLToPath(import.meta.url); const __dirname = path.dirname(__filename); const serverScriptPath = path.resolve( __dirname, "../../build/index.js" ); async function runClient(): Promise<void> { console.log(`Client: Attempting to launch server from: ${serverScriptPath}`); // 1. Create the Transport (StdioClientTransport launches the server) // This transport will start the 'node serverScriptPath' command. const transport = new StdioClientTransport({ command: "node", // Command to run args: [serverScriptPath], // Arguments (path to the server script) // Optional: Add env vars if your server needs them // env: { MY_VAR: "value" } }); // 2. Create the MCP Client instance const client = new Client( { name: "MyGreeterClientScript", version: "1.0.0", }, { capabilities: { tools: {}, resources: {}, }, } ); try { // 3. Connect to the server (this also starts the server process via the transport) console.log("Client: Connecting to server..."); await client.connect(transport); console.log("Client: Successfully connected!"); // 4. Interact with the server // --- Call the 'greet' tool --- console.log("\nClient: Calling 'greet' tool..."); const greetResult = await client.callTool({ name: "greet", arguments: { name: "Programmatic User", politeness: "formal", }, }); interface GreetResultType { content: { text: string }[]; } const typedGreetResult = greetResult as GreetResultType; console.log("Client: 'greet' tool result:", typedGreetResult.content[0]?.text); // --- Read the 'server-info' resource --- console.log("\nClient: Reading 'server-info' resource..."); const resourceResult = await client.readResource({ uri: "info://greeter/about" }); console.log( "Client: 'server-info' resource content:", resourceResult.contents[0]?.text ); // --- Get the 'suggest-greeting' prompt --- console.log("\nClient: Getting 'suggest-greeting' prompt..."); const promptResult = await client.getPrompt({ name: "suggest-greeting", arguments: { name_suggestion: "Example" }, // Pass optional arg }); console.log( "Client: 'suggest-greeting' prompt messages:", JSON.stringify(promptResult.messages, null, 2) ); } catch (error) { console.error("Client: An error occurred:", error); } finally { // 5. Close the connection (this will also typically terminate the server process) console.log("\nClient: Closing connection..."); await client.close(); console.log("Client: Connection closed."); } } runClient().catch((error) => { console.error("Client: Unhandled error occurred:", error); });