"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP servers:

Enables AI assistants to use small smart functions as MCP tools, each generated from a simple folder and callable via HTTP or inside Claude, Cursor, and other IDEs. Includes a public Telegram status checker for channels, groups, and bots without needing an account or Bot API token.

Local macOS MCP servers for Mail, Calendar, Reminders, Notes, Contacts, Messages, Shortcuts, Files, Maps, and system tools. The unified Apple Tools server and individual app servers run over stdio with native macOS permissions; this is an MIT-licensed community project, unaffiliated with Apple.

Enables AI agents to analyze whether they should send an email, evaluating passive aggression and regret probability with a recommendation heavily weighted toward no.

Enables AI agents to communicate with each other through Slack-like room-based channels with messaging, mentions, presence management, and long-polling for real-time collaboration.

Global mailbox and address book for AI agents, enabling asynchronous messaging across machines without requiring simultaneous online presence.

Enables autonomous triage of personal communications and email through deterministic multi-factor urgency scoring, VIP filtering, and context-aware executive auto-drafting. It plugs into any MCP-compliant client to resolve routine communication workflows instantly without frontier LLM round-trips.

A Model Context Protocol server implementation that enables real-time data communication between web pages and client applications through WebSocket connections.

MCP gateway for GREEN-API WhatsApp that lets AI agents send messages, manage instances, and receive notifications via WhatsApp using the Model Context Protocol.

Enables posting, engaging, sending DMs, and reading your own account through the X API v2 with your developer App credentials, while public search remains on Grok's built-in tools.

Enables agents to triage personal communications and email through multi-factor urgency scoring, VIP filtering, and context-aware executive auto-drafting. Runs deterministically as a zero-dependency MCP server over JSON-RPC stdio, avoiding LLM round-trips for routine triage tasks.

MCP server that wraps the Evolution API (WhatsApp) as semantic tools for LLM agents, enabling messaging, chat management, group operations, and instance control via natural language.

Enables multi-account posting, replying, threading, deletes and image/GIF/video uploads through the official X API v2, plus likes, reposts, bookmarks, follows, timelines, search, DMs, Lists and trends. It runs locally over stdio so OAuth tokens and refresh stay on the user's own machine.

Enables querying and retrieving content from Confluence through CQL searches and page content fetching, allowing Claude to seamlessly access information stored in Confluence workspaces.

Exposes the Evolution API v2 (WhatsApp) as 121 tools for MCP clients, enabling management of instances, messages, chats, groups, profiles, labels, webhooks, and integrations.

Linked API MCP server connects your LinkedIn account to AI assistants like Claude, Cursor, and VS Code. Ask them to search for leads, send messages, analyze profiles, and much more – they'll handle it through our cloud browser, safely and automatically.

Enables WhatsApp messaging and management through the Evolution API, supporting sending texts, checking numbers, listing contacts and groups, and more.

Ultimate MCP server for Telegram Bot API — 169 methods, full v9.6 coverage, meta-mode, rate limiting, and circuit breaker, enabling AI to control Telegram bots with natural language.

MCP server for the Stashcat messenger API. Enables AI assistants to read and send messages, manage channels, conversations, files, polls, and more.

A Model Context Protocol server that enables Claude to interact with WhatsApp through the Evolution API, allowing for message sending, contact management, group operations, and WhatsApp instance administration.

Experimental server that implements the Model Context Protocol (MCP) for Nylas API, providing resources, tools, and prompts to help developers integrate email, calendar, and contacts functionality with AI applications.