About
Slack MCP Server bridges AI assistants to your Slack workspace through session mirroring technology. It creates a secure, local connection that gives your AI the same access you already have in your browser—without requiring OAuth apps or workspace admin approval. Key features: - Access direct messages, private channels, and thread history - Search and retrieve messages from your entire Slack workspace - Summarize conversations and find historical messages - Works with your existing Slack web session—no separate authentication required - Operates locally to maintain security and privacy
README
Slack MCP Server
Give Claude the same Slack access you have. DMs, threads, history—no admin approval.
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Why This Exists
I built this because I was working with someone to help me manage a complex workload, and we kept hitting walls. They needed context from my messages—"what did X say about Y?"—but Slack's API blocks access to DMs without admin approval.
Screenshotting messages is not a workflow.
This server bridges the gap. It creates a secure, local bridge between Claude and your Slack web session. It gives your AI the same access you already have in the browser—search history, summarize threads, find that thing someone sent you three weeks ago—without fighting the platform.
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Architecture: Local Session Mirroring
Instead of authenticating as a bot, this server leverages your existing Chrome session credentials (macOS) or manual token injection (Linux/Windows). It mirrors your user access exactly—if you can see it in Slack, Claude can see it too.
Why Not OAuth?
Trade-off: Session tokens expire every 1-2 weeks. Auto-refresh (macOS) or manual update keeps things running.
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Features
Core Capabilities
Stability
unref() for clean process exitTools
| Tool | Description | |------|-------------| |slack_health_check | Verify token validity and workspace info |
| slack_token_status | New: Detailed token age, health, and cache stats |
| slack_refresh_tokens | Auto-extract fresh tokens from Chrome |
| slack_list_conversations | List DMs/channels (with lazy discovery cache) |
| slack_conversations_history | Get messages from a channel or DM |
| slack_get_full_conversation | Export full history with threads |
| slack_search_messages | Search across workspace |
| slack_send_message | Send a message to any conversation |
| slack_get_thread | Get thread replies |
| slack_users_info | Get user details |
| slack_list_users | List workspace users (paginated, 500+ supported) |---
Quick Start
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