pm-cse

Slack MCP Server

Slack MCP server using webauthn.kepler.rip for authentication via Okta WebAuthn.

Features

• slack_search_channels - Find channels by name
• slack_search_messages - Search messages by keyword
• slack_fetch_thread - Get complete thread by timestamp
• slack_fetch_channel_history - Get recent messages from a channel
• slack_search_files - Search for files in Slack
• slack_fetch_recent_messages - Fetch recent messages across all channels

Installation

npm install
npm run build

Configuration

Set the OKTA_AUTH_API_KEY environment variable for authentication with webauthn.kepler.rip:

export OKTA_AUTH_API_KEY="your-api-key"

MCP Configuration

Add to your Claude MCP config:

{
  "mcpServers": {
    "slack": {
      "command": "node",
      "args": ["/Users/jaredboynton/mcp/slack-mcp/dist/index.js"],
      "env": {
        "OKTA_AUTH_API_KEY": "your-api-key"
      }
    }
  }
}

Development

npm run dev    # Run with tsx
npm run build  # Compile TypeScript
npm run start  # Run compiled version

Architecture

This server uses a two-phase authentication flow:

• WebAuthn Authentication: The server authenticates with webauthn.kepler.rip/auth using an API key
• Cookie Extraction: The worker returns Slack cookies after Okta WebAuthn + SAML authentication
• Slack API Calls: The server uses these cookies to make authenticated requests to Slack API

This keeps Slack credentials secure and local to the authentication worker.