Slack

8 tools using the Slack Web API — channels, messages, and threads. Implemented in tools/slackOps.js.

Setup

1. Go to api.slack.com/apps and create a new app (or use an existing one) for your workspace
2. Under OAuth & Permissions, add these bot token scopes:
   • channels:read, groups:read — list channels
   • groups:write — required specifically for slack_create_channel with is_private: true
   • chat:write — send messages and thread replies
   • users:read — look up user info
   • channels:history, groups:history — read message history
3. Install the app to your workspace
4. Copy the Bot User OAuth Token (xoxb-...) into .env as SLACK_BOT_TOKEN

Tools

Tool	Risk	What it does
slack_get_user	READ	Look up a user's info by user ID
slack_list_channels	READ	List channels in the workspace
slack_get_channel	READ	Get details of a single channel
slack_read_messages	READ	Read recent message history from a channel
slack_search_messages	READ	Search messages across the workspace
slack_send_message	HIGH	Post a message to a channel
slack_reply_thread	HIGH	Reply in a thread
slack_create_channel	HIGH	Create a new channel

slack_list_channels paginates automatically via Slack's response_metadata.next_cursor up to the limit you request, so large workspaces don't silently get truncated to the first page.

Example

"Check the #incidents channel for anything from the last hour, and post a summary
in #eng-updates."

Claude calls slack_read_messages on #incidents → slack_send_message (confirm: true) on #eng-updates.

Known limitation

slack_search_messages requires a Slack user token (search:read scope), not a bot token — bot tokens return not_allowed_token_type for search specifically. Every other Slack tool here works fine with a bot token.