Slack

Available from connector 2.114.

What Claude can do

• List channels
• Read a channel's history and a thread's replies
• List members and read a profile

Read-only: no message, reply or reaction is sent.

Everything the service returns is coded before it reaches Claude.

Before you start

Slack does not sign in through a login page but with the token of a Slack app that you (or your Slack administrator) create once:

1. On api.slack.com/apps, create an app "From scratch" in your workspace.
2. Under OAuth & Permissions → Bot Token Scopes, add only: channels:read, channels:history, users:read, users.profile:read.
3. Install to Workspace, then copy the Bot User OAuth Token (it starts with xoxb-).
4. Note the workspace ID (it starts with T; visible in Slack's address in a browser).
5. In Slack, invite the app to the channels it should be able to read (/invite @app-name).

Set up

1. Hidden Tokens dashboard → Connectors.
2. On the Slack row, click Enable.
3. Paste the token and the workspace ID, then Save the token. It is stored encrypted in this computer's vault; it is shown neither to the AI nor on screen, and enters no file of the folder.
4. Click Test. The status becomes "Ready".

Try it in Claude

Summarise this week's messages in #general.

Claude should use a slack__… tool and answer with codes. To get the real values back in a text, ask Hidden Tokens to decode it: they return to your computer, not to the chat.

Switch off the built-in connector

In Claude, Settings → Connectors and Extensions: switch off Slack. Otherwise the AI can go through it, in clear.

Limits

• Read-only. The app only sees the public channels it was invited to; not direct messages.
• "Test" checks that the connector starts, not that Slack accepts the token: a revoked token shows at the first call in Claude.
• Images and attachments are not passed to Claude.
• Not yet tried with a real Slack workspace or on Windows (9 Nov 2026).

A problem? See Troubleshooting.