Slack (MCP) - Nango Docs

🚀 Quickstart

Connect to the Slack MCP server with Nango and call MCP tools in minutes. Slack MCP uses OAuth 2.0 with static client registration.

Create the integration

In Nango (free signup), go to Integrations -> Configure New Integration -> Slack (MCP).

Authorize Slack

Go to Connections -> Add Test Connection -> Authorize, then log in to Slack and approve the requested scopes. Later, you’ll let your users do the same directly from your app.

Call a Slack MCP tool

Make your first MCP request (initialize handshake). Replace the placeholders below with your secret key, integration ID, and connection ID:

cURL
Node

curl "https://api.nango.dev/v2/mcp" \
  -X POST \
  -H "Authorization: Bearer <NANGO-SECRET-KEY>" \
  -H "Provider-Config-Key: <INTEGRATION-ID>" \
  -H "Connection-Id: <CONNECTION-ID>" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "initialize",
    "params": {
        "protocolVersion": "2025-06-18",
        "capabilities": {},
        "clientInfo": {
            "name": "nango-client",
            "version": "1.0.0"
        }
    }
}'

Install Nango’s backend SDK with npm i @nangohq/node. Then run:

import { Nango } from '@nangohq/node';

const nango = new Nango({ secretKey: '<NANGO-SECRET-KEY>' });

const res = await nango.post({
    endpoint: '/v2/mcp',
    providerConfigKey: '<INTEGRATION-ID>',
    connectionId: '<CONNECTION-ID>',
    body: {
        jsonrpc: '2.0',
        id: 1,
        method: 'initialize',
        params: {
            protocolVersion: '2025-06-18',
            capabilities: {},
            clientInfo: {
                name: 'nango-client',
                version: '1.0.0'
            }
        }
    }
});

console.log(res.data);

✅ You’re connected! Check the Logs tab in Nango to inspect requests.

Implement Nango in your app

Follow our Auth implementation guide to integrate Nango in your app.To obtain your own production credentials, follow the setup guide linked below.

📚 Slack (MCP) Integration Guides

How to register your own Slack MCP OAuth app
Create or reuse a Slack app and configure it for MCP (user tokens, redirect URL, scopes).

Official docs: Slack MCP server · Slack API OAuth

🧩 Pre-built syncs & actions for Slack (MCP)

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​🚀 Quickstart

​📚 Slack (MCP) Integration Guides

​🧩 Pre-built syncs & actions for Slack (MCP)

🚀 Quickstart

📚 Slack (MCP) Integration Guides

🧩 Pre-built syncs & actions for Slack (MCP)