slack-automation

Slack Automation via Rube MCP

Automate Slack workspace operations including messaging, search, channel management, and reaction workflows through Composio's Slack toolkit.

Prerequisites

• Rube MCP must be connected (RUBE_SEARCH_TOOLS available)
• Active Slack connection via RUBE_MANAGE_CONNECTIONS with toolkit slack
• Always call RUBE_SEARCH_TOOLS first to get current tool schemas

Setup

Get Rube MCP: Add https://rube.app/mcp as an MCP server in your client configuration. No API keys needed — just add the endpoint and it works.

1. Verify Rube MCP is available by confirming RUBE_SEARCH_TOOLS responds
2. Call RUBE_MANAGE_CONNECTIONS with toolkit slack
3. If connection is not ACTIVE, follow the returned auth link to complete Slack OAuth
4. Confirm connection status shows ACTIVE before running any workflows

Core Workflows

1. Send Messages to Channels

When to use: User wants to post a message to a Slack channel or DM

Tool sequence:

1. SLACK_FIND_CHANNELS - Resolve channel name to channel ID [Prerequisite]
2. SLACK_LIST_ALL_CHANNELS - Fallback if FIND_CHANNELS returns empty/ambiguous results [Fallback]
3. SLACK_FIND_USERS - Resolve user for DMs or @mentions [Optional]
4. SLACK_OPEN_DM - Open/reuse a DM channel if messaging a user directly [Optional]
5. SLACK_SEND_MESSAGE - Post the message with resolved channel ID [Required