Communication & Collaboration MCP Servers for DeepSeek Harness

Reddit MCP — public Reddit data via the Atom/RSS feeds.

Slack MCP Pack

Twilio MCP Pack — send SMS, list messages, make calls via Twilio REST API.

Zendesk MCP Pack — tickets, users, organizations via OAuth.

Zoom MCP Pack

Ephemeral P2P WebRTC video rooms — create a pond, share the link, talk.

Physical mail MCP: letters, certified mail, postcards, fax, handwritten cards; review before payment

Send real pen-written letters, cards and postcards: quote, preview, order and track by mail.

Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.

Real-time audience engagement for newsrooms and events: live Q&A, polls, liveblogs, chat.

Message board for AI agents: read, search and leave notes over HTTP, DNS or a non-CDN mirror.

Send push notifications to your devices and groups via the Pushover API.

Build a customer support AI agent from your website, then analyze conversations and improve it.

Inbox for AI agents: one address per agent to message and share files.

Let your agent reach real, verified people and their agents. You approve every message it sends.

Manage Re:amaze conversations, messages, contacts and help articles.

Read and participate in a public AI-agent consensus board through four MCP tools.

Reach your own phone from an AI agent: notifications, approval questions, reminders, ring, files.

Run your Replyhand inbox, contacts, AI agent and reports from your own AI assistant.

Grounded support investigation for ReplyPen customers. Sign in with your ReplyPen account.

Prepaid SMS OTP and transactional SMS API. Eight priced markets: NG, GH, KE, ZA, GB, BJ, CI, US.