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Slack is the leading platform for team communication and collaboration. The Slack MCP server lets you read and post messages, manage channels, and search your workspace using natural language.

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What Can It Do?

  • Read and send messages to channels and users
  • Manage channels by creating, archiving, and updating
  • Search your workspace for messages, files, and people
  • Handle membership by adding or removing users

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Where to Use It

Add Slack as a tool to any agent. The agent can then manage your workspace conversationally, choosing the right actions based on context. To add an MCP tool to your agent:
  1. Open your agent’s configuration
  2. Click Add tools → Connect an app with MCP
  3. Search for the integration and select it
  4. Authenticate with your account
You can control which tools your agent has access to. After adding an integration, click on it to enable or disable specific tools based on what your agent needs.

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In Workflows (Via Agent Node)

For automated pipelines, use an Agent Node with Slack tools. This gives you the flexibility of an agent within a deterministic workflow.

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As a Custom MCP Node

You can also create a standalone MCP node for a specific action. This generates a reusable node that performs one task, useful when you need the same operation repeatedly in workflows.
To create a custom MCP node:
  1. Go to your node library and search for the integration
  2. Click Create a node with AI
  3. Describe the specific action you want (e.g., “Post a message to #general”)
  4. Test the node and save it for reuse
Custom MCP nodes are single-purpose by design. For tasks that require multiple steps or dynamic decision-making, use an agent instead.

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Available Tools

ToolDescription
Read MessagesRead messages from a channel
Send MessagePost a message to a channel or user. The bot can send messages to public channels even if it hasn’t been added to them (via the chat:write.public scope). For private channels, the bot must be a member.
Send Ephemeral MessageSend a message only visible to one user
Create CanvasCreate a rich canvas message
Add User To ChannelAdd a user to a channel
Remove From ChannelRemove a user from a channel
Delete MessageDelete a message
Get Message ThreadGet a message and replies
Search UsersSearch for users
Create ChannelCreate a new channel
Archive ChannelArchive a channel
Update Channel TopicUpdate a channel’s topic
List Users In ChannelList channel members
SearchSearch messages and files

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Example Prompts

Use these with your agent or in the Agent Node: Send a message: 
Post "Daily standup starts in 10 minutes" to #engineering
Read messages: 
Show me the last 20 messages in #support
Create a channel: 
Create a private channel called "project-phoenix"
Search workspace: 
Search for messages from sarah about quarterly report
Add a user: 
Add john@company.com to the #marketing channel
When Slack tools are used through an agent, messages are posted as the Gumloop bot by default rather than as the authenticated user. This helps distinguish automated messages from manual ones.

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Troubleshooting

IssueSolution
Agent not finding the right dataUse exact channel names with # prefix
Action not completingCheck that you’ve authenticated with Slack
Unexpected resultsThe agent may chain multiple tools (e.g., finding a user first, then adding to channel). Review the agent’s reasoning to understand its approach.
Tool not availableVerify the tool is enabled in your agent’s MCP configuration
Agents are smart enough to chain multiple API calls together. For example, asking “Add the new hire to the engineering channel” will find the user first, then add them. If results seem off, check the agent’s step-by-step reasoning.

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Need Help?

Use this integration directly in Claude or Cursor. Connect remotely via the Slack MCP server using your Gumloop credentials.