MCP servers for communication.
We researched 3 communication MCP servers. Every single one requires an API key or OAuth token. We could not independently test them. Below is what we found, honestly disclosed.
Why these are "untested"
Slack requires a bot token. Discord requires a bot token. Gmail requires an App Password. We do not have test accounts for these services. If you do, you can run our benchmark scripts yourself. They are open source.
Last researched: Jun 7, 2026
What we found
Nexus MCP
santoshakilPure Rust MCP server (~4MB binary) with 48 tools across Telegram, Gmail, WhatsApp, Slack, and Discord. No MCP SDK dependencies.
- +Single binary, no Node.js dependencies
- +48 tools across 5 communication channels
- +Pure Rust — fast and memory-safe
- −Requires bot tokens for Slack/Discord
- −Gmail requires App Password
- −Self-hosted binary — no npx install
// Requires bot tokens / App Passwords
{"mcpServers": {"nexus": {"command": "./nexus", "args": [], "env": {"SLACK_BOT_TOKEN": "xoxb-...", "GMAIL_APP_PASSWORD": "..."}}}}Neo MCP
heydryft206+ tools across 16 integrations including Slack, Gmail, Discord, WhatsApp, LinkedIn, Twitter/X. Uses Chrome extension for browser session auth — no API keys needed for many services.
- +206+ tools — most comprehensive communication MCP
- +Chrome extension extracts auth from browser sessions
- +No API keys for many services
- −Requires Chrome extension installation
- −JavaScript/TypeScript — heavier than Rust
- −Multi-profile setup can be complex
// Install Chrome extension first
{"mcpServers": {"neo": {"command": "npx", "args": ["-y", "neo-mcp@latest"]}}}Slack Official MCP
SlackOfficial remote MCP server from Slack. OAuth-based connection without custom bot app. Search channels, read threads, post messages.
- +Official first-party server
- +OAuth — no bot token management
- +Remote MCP — no local process
- −Requires Slack OAuth approval
- −Limited to workspace permissions
- −Remote-only — no offline use
// Remote MCP via OAuth
{"mcpServers": {"slack": {"url": "https://mcp.slack.com"}}}Have API keys?
If you have Slack, Discord, or Gmail API access, you can run our benchmark scripts and submit results. The test suite is open source and takes ~2 minutes per server.
Run tests on GitHub