korotovsky/slack-mcp-server

Overview

A Go-based MCP server that connects AI agents to Slack without requiring special permissions. It supports direct messages, group DMs, GovSlack, and uses smart history fetch logic to retrieve conversations.

Best for

Best for
Developers building AI agents that need to interact with Slack workspaces without admin approval.

Use cases

• Let an AI agent read and respond to Slack DMs and group chats
• Integrate AI tools with GovSlack or other Slack workspaces
• Automate Slack interactions without requesting additional app permissions

How to use

Install

npx @modelcontextprotocol/inspector go run mcp/mcp-server.go --transport stdio

Tools exposed

• SLACK_MCP_XOXC_TOKEN
• SLACK_MCP_XOXD_TOKEN
• SLACK_MCP_XOXP_TOKEN
• SLACK_MCP_XOXB_TOKEN
• SLACK_MCP_PORT
• SLACK_MCP_HOST
• SLACK_MCP_API_KEY
• SLACK_MCP_PROXY
• SLACK_MCP_USER_AGENT
• SLACK_MCP_CUSTOM_TLS
• SLACK_MCP_SERVER_CA
• SLACK_MCP_SERVER_CA_TOOLKIT
• SLACK_MCP_SERVER_CA_INSECURE
• SLACK_MCP_ADD_MESSAGE_TOOL
• SLACK_MCP_ADD_MESSAGE_MARK
• SLACK_MCP_ADD_MESSAGE_UNFURLING
• SLACK_MCP_REACTION_TOOL
• SLACK_MCP_ATTACHMENT_TOOL
• SLACK_MCP_MARK_TOOL
• SLACK_MCP_USERS_CACHE

Tested with

Cursor

Notes

A Go-based MCP server that connects AI agents to Slack without requiring special permissions. It supports direct messages, group DMs, GovSlack, and uses smart history fetch logic to retrieve conversations.

1,639 stars on GitHub. Last updated 2026-05-21. Licensed MIT.

Use cases

• Let an AI agent read and respond to Slack DMs and group chats
• Integrate AI tools with GovSlack or other Slack workspaces
• Automate Slack interactions without requesting additional app permissions

Pros

• No special Slack permissions needed, simplifying setup
• Supports GovSlack, DMs, and group DMs out of the box
• Smart history fetch reduces unnecessary API calls

Cons

• Limited to Slack MCP protocol, not a general Slack client
• Go runtime required for deployment
• May not support all Slack features like channels or file uploads

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.