Slack MCP Skill: Automate Workspaces With a Single Install

Every team communication workflow starts somewhere, and for most organizations that somewhere is Slack. The Slack MCP skill available on OpenClaw Bazaar turns your workspace into an AI-powered operations hub without writing a single line of integration code.

Rather than manually wiring up Bolt.js, configuring OAuth scopes, and handling event subscriptions yourself, the Slack skill packages all of that into a single installable MCP server. You install it, provide your tokens, and your OpenClaw agent gains full Slack capabilities within minutes.

Why Use a Pre-Built Slack Skill?

Building a Slack integration from scratch requires understanding the Bolt.js framework, managing OAuth token lifecycles, subscribing to the correct events, and handling edge cases like rate limiting and reconnection. The Slack MCP skill on the skills directory handles all of this out of the box.

Here is what you get when you install it:

• Channel and DM support -- your agent can read and respond in any channel it is invited to, plus handle private direct messages
• Slash command registration -- pre-configured commands like /ask, /brief, and /openclaw are registered automatically
• Threaded conversation context -- the skill maintains thread context so multi-turn conversations stay organized
• Interactive modals -- form-based inputs for structured data collection from team members
• File upload and processing -- documents, spreadsheets, and images sent in Slack are parsed and available to the agent
• Socket Mode and HTTP mode -- choose between Socket Mode (no public URL required) or traditional HTTP webhooks

Getting Your Slack Tokens

Before installing the skill, you need credentials from Slack. Go to api.slack.com/apps and create a new application from scratch. Name it whatever you like and select your target workspace.

Under OAuth & Permissions, add these Bot Token Scopes:

chat:write
channels:history
channels:read
commands
app_mentions:read
im:history
im:read
im:write
files:read
files:write
users:read

Enable Event Subscriptions and subscribe to app_mention, message.channels, and message.im. If you want to avoid exposing a public URL, enable Socket Mode in the sidebar and generate an App-Level Token with the connections:write scope.

Install the app to your workspace and copy the Bot User OAuth Token (starts with xoxb-) and, if using Socket Mode, the App-Level Token (starts with xapp-).

Installing the Skill From the Bazaar

Search for "Slack" in the OpenClaw Bazaar skills directory. The community-rated Slack skill supports both Socket Mode and HTTP mode. After installing, configure the MCP server connection in your agent:

mcp_servers:
  slack:
    bot_token: "xoxb-your-token"
    app_token: "xapp-your-token"
    signing_secret: "your-signing-secret"
    mode: "socket"
    allowed_channels:
      - "C01ABC123"
    thread_replies: true
    typing_indicator: true

Start your agent and mention it in an allowed channel. A threaded response confirms the skill is working.

Team Workflow Examples

The Slack skill is not just a chatbot connector. Here are workflows that teams run through it every day:

Standup automation. The agent posts a standup prompt at 9 AM in the team channel. Team members reply in threads. At 9:30 the agent compiles and summarizes all responses into a single digest.

Incident response. A slash command triggers an investigation workflow. The agent pulls relevant logs from connected services, summarizes recent changes from the GitHub skill, and posts findings in a dedicated incident channel.

Customer support triage. Incoming support messages are routed to the agent. It categorizes them by urgency, suggests draft responses, and escalates anything it cannot handle to a human queue.

Knowledge base queries. Team members ask the agent about company processes, documentation, and policies. The agent searches connected Notion databases or internal wikis and responds with sourced answers.

Weekly report generation. Every Friday afternoon, the agent queries data from connected skills (GitHub commits, CRM updates, task completions) and posts a formatted summary to a leadership channel.

Troubleshooting the Slack Skill

Agent does not respond to mentions. Verify that app_mentions:read is included in your scopes and that the app_mention event is subscribed. After adding new scopes, you must reinstall the app to your workspace for them to take effect.

Socket Mode keeps disconnecting. Confirm your App-Level Token includes the connections:write scope. Socket Mode relies on a WebSocket connection that may need periodic reconnection. The skill handles this automatically, but network-level issues can interfere.

"not_in_channel" errors. The bot must be explicitly invited to each channel where you want it to respond. Type /invite @YourBot in the channel.

Slash commands are unresponsive. For Socket Mode, commands route automatically. For HTTP mode, verify the request URL in your Slack app settings points to your server. Also confirm the command is registered under Slash Commands in the app configuration.

Slack Skill vs. Building From Scratch

The Slack skill on OpenClaw Bazaar saves approximately 8-12 hours of initial setup and ongoing maintenance compared to building a custom Bolt.js integration. It handles token refresh, reconnection logic, rate limiting, and error handling. Community ratings and reviews in the skills directory help you evaluate reliability before installing.

For enterprise teams that need workspace-level access control, compliance logging, and admin-managed deployment, the Slack skill supports all Slack plan tiers -- free, Pro, Business+, and Enterprise Grid. Multi-workspace deployment uses Slack's OAuth2 distribution flow, and each workspace receives its own stored token.

Browse the Skills Directory

Find the right skill for your workflow. The OpenClaw Bazaar skills directory has over 2,300 community-rated skills -- searchable, sortable, and free to install.

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