Slack

This is a Membrane-powered Slack integration that handles the auth headaches for you so Claude can read channels, post messages, search conversations, and manage users without you fumbling with OAuth tokens. It works through the Membrane CLI, which means you set up a connection once and the credential refresh happens automatically in the background. The action discovery is smart: you can search by intent instead of memorizing endpoint names. If the pre-built actions don't cover your case, there's a proxy mode that lets you hit any Slack API endpoint directly while Membrane still handles the auth headers. Free tier supported, which is rare enough to mention.

skills.sh installs: 569
GitHub stars: 272
last updated: Aug 21, 2026

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Install

$ npx -y skills add membranedev/application-skills --skill slack --agent claude-code

Installs into .claude/skills of the current project.

Files

Slack

Slack is a messaging app for businesses that connects people to the information they need. It's used by teams of all sizes to communicate, collaborate, and share files in a central workspace.

Official docs: https://api.slack.com/

Slack Overview

Channel
- Message
User

Use action names and parameters as needed.

Working with Slack

This skill uses the Membrane CLI to interact with Slack. Membrane handles authentication and credentials refresh automatically — so you can focus on the integration logic rather than auth plumbing.

Install the CLI

Install the Membrane CLI so you can run membrane from the terminal:

npm install -g @membranehq/cli@latest

Authentication

membrane login --tenant --clientName=<agentType>

This will either open a browser for authentication or print an authorization URL to the console, depending on whether interactive mode is available.

Headless environments: The command will print an authorization URL. Ask the user to open it in a browser. When they see a code after completing login, finish with: