"An example MCP for client prototyping in a business context with a public API call" matching MCP servers:

An MCP server that enables AI agents to pause and request human approval or information via Slack, Telegram, or macOS dialogs before proceeding with actions.

Connects AI agents to anonymous strangers for asking and answering questions in character.

Provides over 1,000 creative ways to decline requests across four categories (polite, humorous, professional, and creative). The MCP server wraps a REST API to help users craft professional rejections through natural language interactions.

An MCP (Multi-Agent Conversation Protocol) Server that enables interaction with the WhatsApp Business API, allowing agents to send messages, manage media, and perform other WhatsApp business operations through natural language.

Enables an AI assistant to place user-approved phone calls in the callee's language through your own Bland or Twilio account, with language detection, script generation, cost estimates, and safety guard rails. Includes a preview-then-confirm gate, plus call status, transcripts, and summaries.

Enables MCP clients to place, monitor, and hang up phone calls through authenticated tools, retrieve transcripts, and exchange correlated task results with a waiting host. It supports simulated or live calling with persisted call lifecycle records, duration limits, and idempotent requests.

Enables AI agents to ring or text a user's actual iPhone, read a question or update aloud, and return the spoken answer back to the agent as text. Calls and messages land in a single titled thread per agent, with tools for polling results, waiting for replies, and labeling conversations.

Listens for Discord @mentions via Gateway and queues them for processing by an agent, exposing a tool to retrieve pending mentions for automated responses.

Listens for Slack @mentions and publishes them as real-time events to the KĀDI event bus, enabling event-driven architectures with low latency.

MCP server that enables AI agents to place real Telegram voice calls and speak a message aloud via TTS, with configurable repeats and call handling.

Lets an AI assistant read call and message history, send texts and picture messages, reach Phone Book contacts by name, and — once switched on — place calls run by a voice agent, all limited to the phone numbers the user ticks. Hosted remotely with OAuth sign-in, so nothing needs to be installed locally.

Bi-directional communication for Claude Code via Voice Calls, SMS, and WhatsApp, allowing users to call Claude, receive callbacks, and interact through multiple channels.

Enables MCP agents to ring a user on their Linux desktop, connect a native OpenAI Realtime assistant for spoken discussion, and return call status or transcripts. It also lets the assistant perform read-only lookups in a fixed document directory during the conversation.

Enables an AI agent to place outbound phone calls through the user's own Twilio account, delivering a spoken message or asking a single question and returning the recipient's transcribed reply to the agent. It exposes just two tools—one-way notifications and one-question calls to a fixed, preconfigured number with built-in rate limits and guardrails.

MCP server for the WhatsApp Business API that enables managing business accounts, phone numbers, message templates, sending template messages, and tracking message status via the Meta Graph API.

Connect any AI agent to your personal Telegram messages through the official Business API, enabling message history search and draft replies with optional manual approval.

Read-only MCP server for Twilio call data, providing tools to search calls, fetch recordings and transcripts, list agents, and generate summaries while explicitly handling timezone and duration measurement discrepancies.

A Python-based MCP server for managing email configurations, sending emails, and reading the latest unread emails.

A Model Context Protocol server that enables AI assistants like Claude to initiate and manage real-time voice calls using Twilio and OpenAI's voice models.

Enables interaction with WhatsApp Business tools and services through a unified API.

Serves fictional social threads as MCP tools, letting users fetch feed digests, open full thread context, and compose or refine private replies within an AI conversation.

MCP server providing secure Twitter access via agent-twitter-client for profile, tweet, search, and relationship operations.

Lets MCP clients like ChatGPT Web and Claude Web read, search, and reply to your personal Telegram chats through the official Telegram Business API, using a self-hosted SQLite archive without MTProto sessions.

Compliance intelligence layer for AI agents sending WhatsApp Business messages. Prevents account suspensions by validating Meta's rules (care windows, opt-outs, rate limits) in real-time before every send.

MCP server for email management that enables reading, searching, drafting, replying to, and sending emails with thread-aware replies and draft-first safety, supporting Gmail API and IMAP/SMTP backends.

An MCP server for sending and receiving emails via IMAP/SMTP, with support for attachments, replies, and display names.

Enables Poke to place real outbound phone calls using ElevenLabs Conversational AI and Twilio, with tools to manage calls and receive summaries.

A Multi-Agent Conversation Protocol server that enables interaction with HubSpot's Business Units API, allowing users to manage company business units through natural language.

Run free live audience Q&A and polls from your agent: start an AskOne room, add and launch a poll, approve or hide questions and mark them answered, close the room, then read the questions as a FAQ draft and get the results. Free AI moderation. Uses an organization API token from askone.org

Discover and connect your agents with other agents via A2A protocol. Share resources for free or fee.