Do I need to build a custom MCP server for Slack?

No. The slack@claude-plugins-official plugin ships the integration. One command installs it and it is available in every Claude Code session.

How does authorisation work?

The plugin handles OAuth on first use. Start a session, ask Claude to do something in Slack, and the plugin walks you through the workspace authorisation flow.

Tooling

Connect Claude Code to Slack with the official plugin

Install the official Slack plugin for Claude Code with one command, then post to channels and read threads from any session — no custom MCP server needed.

April 22, 2026·Updated May 9, 2026·1 min read·Koppelvlak

The official Slack plugin lets Claude Code post into channels and read threads from any session.

What you’ll achieve

Claude Code can read and post to Slack from any session, with no custom MCP server.
One-line install via the official plugin registry.

Step-by-step guide

Step 1: Install the Slack plugin

Run this in your terminal — outside of any Claude Code session:

claude plugin install slack@claude-plugins-official

That’s it.

Verification / Testing

Start a new Claude Code session and ask it to “list my Slack channels” or “summarise the last 10 messages in #general”. You should see Slack tool calls in the transcript, and the plugin will prompt you to authorise on first use.