Slack MCP Server (session-based) vs WhatsApp MCP Server (lharries)

A side-by-side comparison of two Communication servers — tools, transport, auth, maintenance, and copy-paste config for each.

	Slack MCP Server (session-based) Session-token Slack access for AI agents — no OAuth, no app registration, 21 tools, one command. Unverified stdio (local) API key JavaScript	WhatsApp MCP Server (lharries) Connect your personal WhatsApp: search, read and send messages and media locally Verified stdio (local) No auth Python
Category	Communication	Communication
Language	JavaScript	Python
Transport	stdio (local)	stdio (local)
Auth	API key	None
GitHub stars	28	5.7k
Last commit	1 day ago	1 month ago
Verified
Actively maintained
Install	`npx -y @jtalk22/slack-mcp --setup`	`git clone https://github.com/lharries/whatsapp-mcp && cd whatsapp-mcp/whatsapp-bridge && go run main.go`
Repo	Open	Open

Verdict

Pick Slack MCP Server (session-based) if you need the broadest set of tools.

Pick WhatsApp MCP Server (lharries) if you prefer the more popular, battle-tested option, and you want zero-setup with no API key.

Add Slack MCP Server (session-based)

Install / run

npx -y @jtalk22/slack-mcp --setup

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "slack-mcp-server-session-based": {
      "command": "npx",
      "args": [
        "-y",
        "@jtalk22/slack-mcp"
      ],
      "env": {
        "SLACK_TOKEN": "xoxc-your-token",
        "SLACK_COOKIE": "xoxd-your-cookie"
      }
    }
  }
}

Add WhatsApp MCP Server (lharries)

Install / run

git clone https://github.com/lharries/whatsapp-mcp && cd whatsapp-mcp/whatsapp-bridge && go run main.go

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "whatsapp-mcp-server-lharries": {
      "command": "uv",
      "args": [
        "--directory",
        "/absolute/path/to/whatsapp-mcp/whatsapp-mcp-server",
        "run",
        "main.py"
      ]
    }
  }
}

FAQ

Slack MCP Server (session-based) or WhatsApp MCP Server (lharries) — which is better?

Pick Slack MCP Server (session-based) if you need the broadest set of tools. Pick WhatsApp MCP Server (lharries) if you prefer the more popular, battle-tested option, and you want zero-setup with no API key.

Can I use both Slack MCP Server (session-based) and WhatsApp MCP Server (lharries)?

Yes — MCP clients let you enable multiple servers at once. Add both configs to your client's mcpServers and use whichever tool fits the task.

Do Slack MCP Server (session-based) and WhatsApp MCP Server (lharries) work with Claude, Cursor and Windsurf?

Both do. Copy the per-client config below into Claude Desktop, Cursor, or Windsurf.

View Slack MCP Server (session-based) →View WhatsApp MCP Server (lharries) →More comparisons →