Gmail MCP Server

#!/usr/bin/env node import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'; import { z } from 'zod'; import nodemailer from 'nodemailer'; import dotenv from 'dotenv'; dotenv.config(); function createEmailTransporter() { const user = process.env.GMAIL_USER; const pass = process.env.GMAIL_PASS; if (!user || !pass) { throw new Error('Gmail credentials not found. Set GMAIL_USER and GMAIL_PASS environment variables.'); } return nodemailer.createTransport({ service: 'gmail', auth: { user, pass }, }); } async function sendEmail(to: string, subject: string, body: string) { const transporter = createEmailTransporter(); try { const info = await transporter.sendMail({ from: process.env.GMAIL_USER, to, subject, text: body, }); return { success: true, messageId: info.messageId, }; } catch (error) { return { success: false, error: error instanceof Error ? error.message : 'Unknown error', }; } } async function main() { const server = new McpServer({ name: 'gmail-mcp-server', version: '1.0.0' }); server.registerTool( 'send_email', { title: 'Send Email', description: 'Send an email using Gmail SMTP', inputSchema: { to: z.string().email().describe('Recipient email address'), subject: z.string().min(1).describe('Email subject'), body: z.string().min(1).describe('Email body content') }, outputSchema: { success: z.boolean().describe('Whether email was sent successfully'), messageId: z.string().optional().describe('Message ID from Gmail'), error: z.string().optional().describe('Error message if failed') } }, async ({ to, subject, body }) => { const result = await sendEmail(to, subject, body); return { content: [{ type: 'text', text: result.success ? `Email sent to ${to}. Message ID: ${result.messageId}` : `Failed to send email: ${result.error}` }], structuredContent: result }; } ); const transport = new StdioServerTransport(); await server.connect(transport); } main().catch((error) => { console.error('Server error:', error); process.exit(1); });