Slack MCP Server

MCP server for Slack operations with Keycard authentication.

Features

• List and browse workspace channels
• Read channel message history and thread replies
• Send, update, and delete messages
• Reply to message threads
• Add and remove emoji reactions
• Search messages across the workspace
• Manage channel bookmarks
• Look up user profiles

Setup

1. Copy .env.example to .env and fill in your Keycard credentials
2. Run uv sync to install dependencies
3. Run uv run python -m src.server to start the server

Tools

Channel Tools

• list_channels - List public/private channels in the workspace
• get_channel - Get channel details
• get_channel_history - Get channel message history
• get_thread_replies - Get replies in a message thread

User Tools

• list_users - List workspace users
• get_user - Get user profile details
• get_user_by_email - Look up user by email

Message Tools

• send_message - Send a message to a channel
• update_message - Update an existing message
• delete_message - Delete a message
• send_reply - Reply in a message thread

Reaction Tools

• add_reaction - Add emoji reaction to a message
• remove_reaction - Remove emoji reaction from a message
• get_reactions - Get reactions on a message

Search Tools

• search_messages - Search messages across the workspace

Bookmark Tools

• list_bookmarks - List channel bookmarks
• add_bookmark - Add a bookmark to a channel

Deployment

Deploy to Render using render.yaml.