Slack MCP Server

by jtalk22 Your server? Claim it

answering

Slack MCP Server is answering right now. Last checked 10 min ago. 477 installs a week from npm. Last commit 31 Oct 2026.

Catch up on Slack without reading it. Unreads, threads, search. Browser-session or hosted OAuth.

Installs per day peak 481 · avg 87 · +83% w/w

a month agotoday

Uptime history 91 days of history · worst day 93%

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

—

Tools

hidden behind auth

113 ms

Response time

average over 24h

477

Installs / week

npm and PyPI

What the code does

We read the source, 1 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs an external command src/cli.js:100, [пакет] src/cli.js:100

const child = spawn(process.execPath, [scriptPath, ...scriptArgs], {

Page executes code built at runtime public/demo-slack-mcp.html:1830, public/demo.html:942, public/index.html:455 и ещё 1

        element.innerHTML = formattedText;

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add slack-mcp-server --transport http https://mcp.revasserlabs.com/oauth/mcp

Settings → Connectors → Add custom connector, then paste this address

https://mcp.revasserlabs.com/oauth/mcp

~/.codex/config.toml

[mcp_servers.slack-mcp-server]
url = "https://mcp.revasserlabs.com/oauth/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "slack-mcp-server": {
      "url": "https://mcp.revasserlabs.com/oauth/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "slack-mcp-server": {
      "type": "http",
      "url": "https://mcp.revasserlabs.com/oauth/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.revasserlabs.com/oauth/mcp	streamable-http	sign-in	90 ms	10 min ago

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Slack MCP Server — questions

Answers built from our own checks of this server.

Why is there no tool list for Slack MCP Server?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Slack MCP Server working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 113 ms. The bar chart above shows every period we have measured.

How do I connect Slack MCP Server?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Slack MCP Server?

No API key is involved. Slack MCP Server answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Slack MCP Server?

It answers our handshake in 113 ms on average, which is faster than 90% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Slack MCP Server?

The npm package @jtalk22/slack-mcp was installed 477 times in the last week. Week over week that is +83%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Slack MCP Server open source?

The code is open source: it is published under the MIT licence, written in JavaScript and 32 stars on GitHub. The licence covers the code in the repository, not the hosted service at mcp.revasserlabs.com, which runs on its operator's own terms.