index.ts•3.42 kB
#!/usr/bin/env node
import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import {
CallToolRequestSchema,
ListToolsRequestSchema,
Tool,
} from '@modelcontextprotocol/sdk/types.js';
/**
* MCP Server Scaffold
*
* This is a basic MCP server implementation that provides:
* - A sample tool for demonstration
* - Proper error handling
* - Standard MCP protocol compliance
*/
class MCPServerScaffold {
private server: Server;
constructor() {
this.server = new Server(
{
name: 'mcp-server-scaffold',
version: '1.0.0',
},
{
capabilities: {
tools: {},
},
}
);
this.setupToolHandlers();
this.setupErrorHandling();
}
private setupToolHandlers(): void {
// List available tools
this.server.setRequestHandler(ListToolsRequestSchema, async () => {
return {
tools: [
{
name: 'echo',
description: 'Echo back the provided message',
inputSchema: {
type: 'object',
properties: {
message: {
type: 'string',
description: 'The message to echo back',
},
},
required: ['message'],
},
} as Tool,
{
name: 'get_current_time',
description: 'Get the current date and time',
inputSchema: {
type: 'object',
properties: {},
},
} as Tool,
],
};
});
// Handle tool calls
this.server.setRequestHandler(CallToolRequestSchema, async (request) => {
const { name, arguments: args } = request.params;
try {
switch (name) {
case 'echo':
return {
content: [
{
type: 'text',
text: `Echo: ${args.message}`,
},
],
};
case 'get_current_time':
const now = new Date();
return {
content: [
{
type: 'text',
text: `Current time: ${now.toISOString()}`,
},
],
};
default:
throw new Error(`Unknown tool: ${name}`);
}
} catch (error) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
return {
content: [
{
type: 'text',
text: `Error: ${errorMessage}`,
},
],
isError: true,
};
}
});
}
private setupErrorHandling(): void {
this.server.onerror = (error) => {
console.error('[MCP Error]', error);
};
process.on('SIGINT', async () => {
await this.server.close();
process.exit(0);
});
}
async run(): Promise<void> {
const transport = new StdioServerTransport();
await this.server.connect(transport);
// Server is now running and will handle requests via stdio
console.error('MCP Server Scaffold started successfully');
}
}
// Start the server
const server = new MCPServerScaffold();
server.run().catch((error) => {
console.error('Failed to start MCP server:', error);
process.exit(1);
});