MCP Slack

Name: MCP Slack
Author: crunchtools

by crunchtoolsversion 0.1.2i★ 2iRuns on your computer

Registry nameio.github.crunchtools/slack

How to install

Overview

Description from the maker (original English)

Secure read-only MCP server for Slack workspaces

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.

Passed 2/2 checks · Runs on your computer

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Python (uv) on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Python (uv)
One time only; it works for every server that needs Python (uv)
Open the Python (uv) download page ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

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

Done

Quit Claude and open it again
Done
Try it
Use MCP Slack and tell me what you can do for me, then show me one thing
✓ If Claude says it is using MCP Slack or shows a MCP Slack tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect MCP Slack yet

MCP Slack runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect MCP Slack

Steps for Claude →Install Python (uv) on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Python (uv) on your computer first (one time)
Steps for Cursor →Install Python (uv) on your computer first (one time)
Steps for VS Code →Install Python (uv) on your computer first (one time)

B · Others in Chat & email that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Inbox Zero✓ ChatGPT
Agent-Native Chat✓ ChatGPT
draw.io✓ ChatGPT

Works with Claude Code, with some setup first

Install Python (uv) on your computer first (one time)

Install Python (uv)
One time only; it works for every server that needs Python (uv)
Open the Python (uv) download page ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

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

Done

Type /mcp in Claude Code
You should see MCP Slack listed as connected
Done
Try it
Use MCP Slack and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using MCP Slack or shows a MCP Slack tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Python (uv) on your computer first (one time)

Install Python (uv)
One time only; it works for every server that needs Python (uv)
Open the Python (uv) download page ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use MCP Slack and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using MCP Slack or shows a MCP Slack tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Python (uv) on your computer first (one time)

Install Python (uv)
One time only; it works for every server that needs Python (uv)
Open the Python (uv) download page ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use MCP Slack and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using MCP Slack or shows a MCP Slack tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use MCP Slack💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

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

Claude Desktop (claude_desktop_config.json)

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

Cursor (~/.cursor/mcp.json)

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

VS Code (mcp.json)

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

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

At a glance

GitHub stars i: 2
Downloads per weeki: 159/wk
Licence i: No licence stated
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.1.2
Categoryi: Chat & email
Published to registryi: Mar 26, 2026
Code last changedi: Nov 10, 2026
Maker: crunchtools
Packages: pypi: mcp-slack-crunchtools
Repo: crunchtools/mcp-slack
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

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 11, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account crunchtools, which owns the repo
✓ Pass
Still maintained
Code last changed yesterday
… 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

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Chat & emaili

More stars than 89% of the other 1945 servers in this category
Published to the registry more recently than 4% of the other 1945 servers in this category
Basic checks equal to or better than 100% of the other 1945 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 2 of 2 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 yesterday, 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: Inbox Zero, Agent-Native Chat, draw.io

Alternatives

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

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

Inbox Zero

Search Gmail and Outlook, save drafts, manage email rules, and view email stats.

by elie222Widely used★ 13KUpdated 41 days ago

Runs in the cloud

Install

Agent-Native Chat

Minimal chat-first app with durable threads, actions, and the app-agent loop

by BuilderIOWidely used★ 7.7K Stars for the whole repoUpdated 2 months ago

Runs in the cloud

Install

draw.io

Create draw.io diagrams in chat from Mermaid or XML, shown live and interactive. 10,000+ shapes.

by jgraphWidely used★ 5.8KUpdated yesterday

Runs in the cloud✓ draw.io

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

What you can do with it

Install

Install Python (uv)

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Python (uv)

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Python (uv)

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Python (uv)

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

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

Discussion

User reviews

Compared with others in Chat & emaili

Common questions

Alternatives

Inbox Zero

Agent-Native Chat

draw.io

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