slack-mcp-server MCP — ユースケース, インストール & ライブデモ

なぜ使うのか

主な機能

15 MCP tools for comprehensive Slack workspace interaction
Stealth mode — works without additional permission grants using browser tokens
Unread message fetching with priority sorting and @mention filtering
Enterprise and GovSlack workspace support
Multiple transports: Stdio, SSE, and HTTP with proxy configuration

ライブデモ

実際の動作

slack-mcp-server-2.replay ▶ 準備完了

0/0

インストール

クライアントを選択

~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "slack-mcp-server-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/korotovsky/slack-mcp-server"
      ]
    }
  }
}

Claude Desktop → Settings → Developer → Edit Config を開く。保存後、アプリを再起動。

~/.cursor/mcp.json · .cursor/mcp.json

{
  "mcpServers": {
    "slack-mcp-server-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/korotovsky/slack-mcp-server"
      ]
    }
  }
}

Cursor は Claude Desktop と同じ mcpServers スキーマを使用。プロジェクト設定はグローバルより優先。

VS Code → Cline → MCP Servers → Edit

{
  "mcpServers": {
    "slack-mcp-server-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/korotovsky/slack-mcp-server"
      ]
    }
  }
}

Cline サイドバーの MCP Servers アイコンをクリックし、"Edit Configuration" を選択。

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "slack-mcp-server-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/korotovsky/slack-mcp-server"
      ]
    }
  }
}

Claude Desktop と同じ形式。Windsurf を再起動して反映。

~/.continue/config.json

{
  "mcpServers": [
    {
      "name": "slack-mcp-server-2",
      "command": "TODO",
      "args": [
        "See README: https://github.com/korotovsky/slack-mcp-server"
      ]
    }
  ]
}

Continue はマップではなくサーバーオブジェクトの配列を使用。

~/.config/zed/settings.json

{
  "context_servers": {
    "slack-mcp-server-2": {
      "command": {
        "path": "TODO",
        "args": [
          "See README: https://github.com/korotovsky/slack-mcp-server"
        ]
      }
    }
  }
}

context_servers に追加。保存時に Zed がホットリロード。

claude mcp add slack-mcp-server-2 -- TODO 'See README: https://github.com/korotovsky/slack-mcp-server'

ワンライナー。claude mcp list で確認、claude mcp remove で削除。

ユースケース

実用的な使い方： slack-mcp-server

How to catch up on unread Slack messages with AI assistance

👤 Busy professionals drowning in Slack notifications ⏱ ~10 min beginner

使うタイミング： Monday morning or after PTO — you have hundreds of unread messages across channels.

前提条件

Slack token (xoxc/xoxd for stealth, xoxp for OAuth) — Extract from browser cookies or create via Slack app settings

フロー

Get unread summary

Show me all my unread Slack messages, prioritized by @mentions first, then channels with most activity.✓ コピーしました

→ Prioritized list of unread channels with message counts and highlights
Read key threads

Show me the full thread for the @mention in #engineering. Summarize what they need from me.✓ コピーしました

→ Thread content with action items extracted
Mark as read

Mark #random and #general as read — I'll skip those.✓ コピーしました

→ Channels marked as read

結果： Inbox zero on Slack in 10 minutes instead of 30.

注意点

Stealth mode tokens expire periodically — Re-extract xoxc/xoxd tokens from your browser when they expire

Search Slack history for decisions and context

👤 Anyone who needs to find a specific conversation or decision from the past ⏱ ~5 min beginner

使うタイミング： You need to find that one Slack message where a decision was made weeks ago.

前提条件

Slack token configured — Set SLACK_TOKEN environment variable

フロー

Search messages

Search Slack for messages about 'API redesign' from the last month in engineering channels.✓ コピーしました

→ Matching messages with timestamps, authors, and context
Get the full thread

Show me the full thread where the final decision was made.✓ コピーしました

→ Complete thread with all replies

結果： Found the specific conversation with the context you needed.

注意点

Search only works within channels you have access to — If a message was in a private channel, you need to be a member

組み合わせ

他のMCPと組み合わせて10倍の力を

slack-mcp-server-2 + github

Cross-reference Slack discussions with GitHub PRs and issues

Search Slack for mentions of PR #142, then get the PR details from GitHub and summarize the full context.✓ コピーしました

slack-mcp-server-2 + filesystem

Export Slack conversations to files for documentation

Export the full #architecture-decisions channel history to ~/docs/architecture-decisions.md.✓ コピーしました

ツール

このMCPが提供する機能

ツール	入力	呼び出すタイミング	コスト
conversations_history	channel: str, limit?: int	Fetch messages from a channel or DM	1 Slack API call
conversations_unreads	none	Get all unread messages across channels	Multiple Slack API calls
conversations_search_messages	query: str, filters?	Search messages across workspace	1 Slack API call
conversations_replies	channel: str, ts: str	Get thread replies	1 Slack API call
channels_list	none	List workspace channels	1 Slack API call
users_search	query: str	Find users by name or email	1 Slack API call
conversations_mark	channel: str, ts: str	Mark a channel as read (disabled by default)	1 Slack API call

コストと制限

運用コスト

APIクォータ: Slack API rate limits: varies by method, typically 50+ req/min for most endpoints
呼び出しあたりのトークン: 300–2000 tokens per tool call
金額: Free — Slack API is free. Enterprise features require Slack Enterprise Grid.
ヒント: Use conversations_unreads for efficient catch-up instead of reading every channel individually.

セキュリティ

権限、シークレット、影響範囲

認証情報の保管： Slack tokens in SLACK_TOKEN environment variable. For stealth mode, extract xoxc + xoxd from browser.

データ送信先： All calls to Slack API (api.slack.com). Supports proxy configuration.

Stealth mode uses browser session tokens which may violate Slack's ToS in enterprise environments.
Write operations (add_message, reactions) are disabled by default. Enable explicitly via env vars.
Messages may contain sensitive company data. Ensure your AI processing is appropriately scoped.

トラブルシューティング

よくあるエラーと対処法

401 Invalid auth

Your Slack token expired or is invalid. Re-extract browser tokens (stealth) or regenerate the OAuth/bot token.

確認： curl -H 'Authorization: Bearer $SLACK_TOKEN' https://slack.com/api/auth.test

Channel not found

Use the channel name with # (e.g., #general) or the channel ID. Run channels_list to find the correct identifier.

確認： channels_list

Rate limited

Slack has per-method rate limits. The server handles backoff automatically, but reduce concurrent requests.

確認： Check server logs for retry messages

代替案

slack-mcp-server 他との比較

代替案	代わりに使う場面	トレードオフ
Discord MCP	Your team uses Discord instead of Slack	Different platform, similar coverage

その他

リソース

📖 GitHub の公式 README を読む

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