Best MCP servers for realtime messaging

When an agent needs to reach people where they already are, messaging is the channel: post a Slack update, answer in a Discord channel, send an SMS confirmation, or relay a Telegram alert. Realtime messaging servers let an agent read recent history for context and then send, reply, or broadcast, closing the loop between automated work and the humans who need to know about it. The right pick depends on the audience, an internal team on Slack, a community on Discord, a global SMS and voice reach via Twilio, or a direct Telegram conversation. Reading context before writing matters here: an agent that can search prior messages writes far better replies. The servers below cover the common messaging surfaces, each a real MCP server with a verified, current install config.