MCP Slack

Name: MCP Slack
Author: crunchtools

by crunchtoolsversion 0.1.2i★ –iRuns on your computer

Registry nameio.github.crunchtools/slack

Install

Overview

Description from the maker (original English)

Secure read-only MCP server for Slack workspaces

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Chat & email

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "slack": {
      "command": "uvx",
      "args": [
        "mcp-slack-crunchtools"
      ]
    }
  }
}

Run this in your terminal

claude mcp add slack -- uvx mcp-slack-crunchtools

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "slack": {
      "command": "uvx",
      "args": [
        "mcp-slack-crunchtools"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "slack": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mcp-slack-crunchtools"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account crunchtools, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Chat & emaili

More stars than 0% of the other 1766 servers in this category
Published to the registry more recently than 5% of the other 1766 servers in this category
Basic checks equal to or better than 100% of the other 1766 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MCP Slack safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.2) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Vexa, emailmd, MCP WhatsApp Cloud

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Vexa

by Vexa-ai

Meeting bot and transcripts for Google Meet, Teams and Zoom. Live or after, speakers labelled.

Runs in the cloud★ 2,949Apache-2.0Updated 2 months ago

Install

emailmd

by anypost

Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.

Computer or cloud★ 1,385MITUpdated 31 days ago

Install

MCP WhatsApp Cloud

by codespar

MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API

Runs on your computer★ 277MITUpdated 5 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

mcp-slack-crunchtools

Secure MCP server for Slack workspaces. Provides Claude Code (and other MCP clients) with read access to your Slack channels, messages, users, and files, and can send a message on your behalf.

Features

Mostly read: 15 of the 17 tools only read and publish readOnlyHint: true. The other two send a message and cancel a scheduled one; nothing edits or deletes existing content.
Secure: 6-layer security model (input validation, token handling, client hardening, output sanitization, runtime protection, supply chain security).
User OAuth Token: Uses xoxp- tokens for user-scoped access to your workspace.
No SDK dependency: Uses httpx directly for minimal, auditable HTTP calls.

Quick Start

Using uvx (Recommended)

claude mcp add mcp-slack-crunchtools \

--env SLACK_USER_TOKEN=[PopNx MCP ตัดค่าที่หน้าตาเหมือนกุญแจออก] \ -- uvx mcp-slack-crunchtools

Using Container

claude mcp add mcp-slack-crunchtools \

--env SLACK_USER_TOKEN=[PopNx MCP ตัดค่าที่หน้าตาเหมือนกุญแจออก] \ -- podman run -i --rm -e SLACK_USER_TOKEN quay.io/crunchtools/mcp-slack

Local Development

claude mcp add mcp-slack-crunchtools \

--env SLACK_USER_TOKEN=[PopNx MCP ตัดค่าที่หน้าตาเหมือนกุญแจออก] \ -- uv run mcp-slack-crunchtools

Setup

See CLAUDE.md for detailed instructions on creating a Slack app and obtaining a User OAuth Token.

Configuration

Authentication uses one of two mutually exclusive modes. The server picks cookie mode when both cookie variables are set, and token mode otherwise.

Variable	Required	Default	Description
`SLACK_USER_TOKEN`	token mode	—	User OAuth token (`xoxp-...`) from a Slack app installed in the workspace.
`SLACK_COOKIE_TOKEN`	cookie mode	—	Browser session token (`xoxc-...`). Must be paired with `SLACK_COOKIE_D`.
`SLACK_COOKIE_D`	cookie mode	—	Value of the `d` cookie (`xoxd-...`) from the same browser session. Sent as a `Cookie:` header alongside `SLACK_COOKIE_TOKEN`.
`SLACK_ADD_MESSAGE_DELAY`	no	`3m`	How far ahead outgoing messages are scheduled, giving you a window to cancel one. Duration string: `30s`, `5m`, `2h`, or a bare integer for seconds. Set to `0`, `0s`, `none`, or `false` to disable scheduling and post immediately.

Which auth mode to use

Cookie mode is the working path for this deployment. Token mode requires a Slack app to be created and approved in the workspace; where that approval is not available, cookie mode is the only way to authenticate at all.

Cookie mode borrows an existing browser session rather than holding a credential issued to an application. That has consequences worth stating plainly:

Both values are live session credentials. Anything holding them can act as you in Slack, with your full access. Treat them exactly as you would your password.
They expire when the browser session does, so cookie mode needs periodic re-extraction. A sudden wave of auth failures usually means the session rotated, not that the server broke.
Slack does not issue these for programmatic use and can invalidate them at any time. Cookie mode is a workaround for the absence of an approved app, not a supported integration path.

Prefer SLACK_USER_TOKEN whenever a Slack app can actually be installed.

Tools

Tool	Description
`slack_auth_test`	Test connection and get token owner info
`slack_list_channels`	List workspace channels
`slack_get_channel_info`	Get channel details
`slack_get_channel_history`	Read channel messages
`slack_get_thread_replies`	Read thread replies
`slack_list_channel_members`	List channel members
`slack_search_messages`	Search messages
`slack_get_reactions`	Get message reactions
`slack_list_reactions`	List user's reactions
`slack_list_stars`	List starred items
`slack_get_user_info`	Get user details
`slack_list_users`	List workspace members
`slack_get_user_profile`	Get user profile
`slack_list_files`	List files (metadata only)
`slack_get_file_info`	Get file metadata
`slack_send_message`	Schedule a message `SLACK_ADD_MESSAGE_DELAY` ahead, or post it immediately when the delay is `0` (write)
`slack_cancel_scheduled_message`	Cancel a scheduled message before it sends (write)

The two write tools need the chat:write scope in token mode.

Security

See SECURITY.md for the full security design document.

License

AGPL-3.0-or-later

MCP Slack

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Chat & emaili

Common questions

Alternatives

Vexa

emailmd

MCP WhatsApp Cloud

README from the maker

mcp-slack-crunchtools

Features

Quick Start

Using uvx (Recommended)

Using Container

Local Development

Setup

Configuration

Which auth mode to use

Tools

Security

License