@arvoretech/slack-advanced-mcp

Advanced Slack MCP Server -- sends messages as the authenticated user, with fuzzy user search, smart DMs, writing style analysis, thread extraction, audio transcription (ElevenLabs), and image analysis.

Setup

Env vars

| Variable | Required | Description | |---|---|---| | SLACK_USER_TOKEN | Yes | Slack user OAuth token (xoxp-...) | | ELEVENLABS_API_KEY | No | ElevenLabs API key for audio transcription | | SLACK_USERS_CACHE_PATH | No | Path to users cache JSON (default: ~/.slack-advanced-mcp/users_cache.json) | | SLACK_USERS_CACHE_TTL_MINUTES | No | Cache TTL in minutes (default: 240) |

Slack App Scopes (User Token Scopes)

chat:write, users:read, users.profile:read, channels:history, groups:history, im:history, mpim:history, im:write, files:read, search:read

MCP Config

{
  "mcpServers": {
    "slack-advanced": {
      "command": "npx",
      "args": ["-y", "@arvoretech/slack-advanced-mcp"],
      "env": {
        "SLACK_USER_TOKEN": "xoxp-...",
        "ELEVENLABS_API_KEY": "sk_..."
      }
    }
  }
}

Tools

| Tool | Description | |---|---| | search_users | Fuzzy search users by name, email, or display name with disk cache | | get_user_profile | Full user profile (title, status, timezone, avatar) | | send_dm | Send DM resolving user by name/email/ID. Messages sent as you | | get_dm_history | DM history with a user, with pagination | | analyze_writing_style | Writing style metrics (emoji usage, formality, vocabulary, etc.) | | get_thread_from_link | Extract messages from a Slack thread URL | | transcribe_audio | Transcribe audio files shared in Slack (ElevenLabs STT) | | analyze_image | Download and return Slack images for model analysis | | get_file_info | File metadata (name, type, size, permalink) |