Slack & Discord MCP Servers
Read and post to chat, email, and messaging platforms on an agent's behalf.
What is a communication MCP server?
Communication MCP servers connect an agent to chat, messaging, and telephony platforms — Slack, Discord, SMS/voice via providers like Twilio — so it can read conversation history, search across channels, and post messages on your behalf. Depending on the specific platform, this typically includes reading recent history, searching across channels or contacts, and — where explicitly enabled — sending a message, all exposed as discrete tools the agent calls individually rather than a single open-ended "do anything on this platform" capability.
Why give your agent communication access?
A lot of real work happens inside chat tools: decisions get made in a Slack thread, support requests come in over SMS, a community runs on Discord. A communication MCP server lets an agent participate in that directly — summarizing an unread channel, drafting a reply, or sending a scheduled update — instead of requiring someone to copy-paste context in and messages out by hand. In practice this looks like an agent triaging a Slack channel first thing in the morning and surfacing only the threads that actually need a response, or drafting a reply to a support message on WhatsApp that a human reviews before it sends. The time saved isn't the message itself — it's not having to manually scan five different apps to find out what actually needs attention.
What to check before you install one
Check exactly which permissions/scopes a server requests before connecting it to a real workspace — a Slack server should document precisely which OAuth scopes it needs (history, read, post) rather than asking for broad access. For anything that can send messages on your behalf, confirm whether there's a review or confirmation step before something actually goes out, especially for a first-time setup. It's also worth testing a new connection in a low-stakes channel or a private group first, before pointing it at a workspace-wide channel — this catches permission or formatting issues without the cost of a mistake being visible to everyone. As with any of these categories, it's worth revisiting the setup after real usage — a connection that started read-only for safety may be ready for gated write access once you've seen how the agent actually behaves in practice.
Which of the 6 listed communication servers should you use?
Pick based on which platform your actual conversations live in, since none of these six substitute for each other. Slack MCP Server is the most feature-complete of the group — full history, search, threads, and reactions — and the obvious choice for team workspaces already on Slack. Discord MCP Server and Telegram MCP Server cover community and personal messaging respectively; Telegram's is notable for using the real MTProto client API (not the more limited Bot API), which means it can read and search your actual chat history, not just bot-visible messages. WhatsApp MCP Server works similarly — it bridges your personal WhatsApp account locally rather than using WhatsApp's separate Business API, so nothing routes through a third party. Google Workspace MCP is the broadest single listing here, covering Gmail, Calendar, Drive, Docs, and Sheets under one OAuth-authenticated server, worth it if most of your communication and scheduling already runs through Google rather than Slack or Discord. oChats — Yaeris MCP is the right pick specifically if you're running oChats as your omnichannel messaging platform. Most people will only need one or two of these, matched to wherever their actual conversations already happen. If your team spans multiple platforms — Slack for internal chat, WhatsApp for customer contact — running more than one of these together is normal and expected, since each is scoped to its own platform and credentials independently.