Slack MCP Server

What is Slack MCP Server?

A Model Context Protocol (MCP) server that enables LLMs to interact with Slack workspaces. It provides 11 tools for searching, reading, and managing Slack content, 4 resources for workspace information, and 5 prompts for common workflows.

How to use Slack MCP Server?

Install via npx with a Slack bot token and team ID. Add the server to your Claude Desktop configuration under mcpServers, specifying "command": "npx", "args": ["-y", "@sergdev1/slack-mcp-server"], and setting SLACK_BOT_TOKEN and SLACK_TEAM_ID environment variables.

Key features of Slack MCP Server

• 11 tools for channel, message, user, file, and reaction management
• 4 resources for workspace, user, and channel metadata
• 5 prompts for guided workflows like standup and knowledge search
• Search with modifiers (from, in, after, before, has:link, has:file)
• Pagination and rate-limit awareness
• Modular architecture for easy extension

Use cases of Slack MCP Server

• Search messages across the workspace for specific topics
• List all public and private channels and their details
• Summarize channel activity over a defined time period
• Find recent discussions or institutional knowledge
• Add and remove emoji reactions on messages

FAQ from Slack MCP Server

What OAuth scopes are required?

Essential scopes are channels:read, channels:history, groups:read, groups:history, users:read, users:read.email, and team:read. Additional scopes for full functionality include im:read, im:history, mpim:read, mpim:history, search:read, files:read, reactions:read, reactions:write, and bookmarks:read.

How to fix "channel_not_found" error?

Ensure the bot is a member of the channel, use the channel ID (not the name), and verify the channel has not been archived.

How to fix "missing_scope" error?

Add the required OAuth scopes to your Slack app and reinstall the app to your workspace. Some scopes may require admin approval.

Why are no messages returned?

Verify the bot has the appropriate history scope for the channel type (public, private, DM). Check the time range parameters and ensure the channel contains messages in that range.

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