Gmail MCP Server

import {z} from 'zod'; import type {McpServer} from '@modelcontextprotocol/sdk/server/mcp.js'; import type {Config} from './types.js'; import {makeGmailApiCall} from '../utils/gmail-api.js'; import {jsonResult} from '../utils/response.js'; const inputSchema = { draftId: z.string().describe('The ID of the draft to update'), to: z.string().optional().describe('Recipient email address(es), comma-separated'), subject: z.string().optional().describe('Email subject'), body: z.string().optional().describe('Email body (plain text)'), cc: z.string().optional().describe('CC email address(es), comma-separated'), bcc: z.string().optional().describe('BCC email address(es), comma-separated'), }; const outputSchema = z.object({ id: z.string(), message: z.object({ id: z.string(), threadId: z.string(), }).optional(), }); export function registerDraftUpdate(server: McpServer, config: Config): void { server.registerTool( 'gmail_draft_update', { title: 'Update draft', description: 'Update an existing draft', inputSchema, outputSchema, }, async ({draftId, to, subject, body, cc, bcc}) => { const headers = [ ...(to ? [`To: ${to}`] : []), ...(subject ? [`Subject: ${subject}`] : []), ...(cc ? [`Cc: ${cc}`] : []), ...(bcc ? [`Bcc: ${bcc}`] : []), 'Content-Type: text/plain; charset=utf-8', ].join('\r\n'); const email = `${headers}\r\n\r\n${body ?? ''}`; const encodedEmail = Buffer.from(email).toString('base64url'); const result = await makeGmailApiCall('PUT', `/users/me/drafts/${draftId}`, config.token, { message: {raw: encodedEmail}, }); return jsonResult(outputSchema.parse(result)); }, ); }