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About
Secure read-only MCP server for Slack workspaces
Security Report
4.5
Use Caution4.5High RiskValid MCP server (1 strong, 4 medium validity signals). 5 known CVEs in dependencies (1 critical, 3 high severity) Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
12 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-crunchtools-slack": {
"args": [
"mcp-slack-crunchtools"
],
"command": "uvx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
mcp-slack-crunchtools
Secure read-only MCP server for Slack workspaces. Provides Claude Code (and other MCP clients) with access to your Slack channels, messages, users, and files without any write permissions.
Features
- Read-only: 15 tools, all read-only. Never posts, edits, or deletes anything.
- Secure: 6-layer security model (input validation, token handling, client hardening, output sanitization, runtime protection, supply chain security).
- User OAuth Token: Uses
xoxp-tokens for user-scoped access to your workspace. - No SDK dependency: Uses
httpxdirectly for minimal, auditable HTTP calls.
Quick Start
Using uvx (Recommended)
claude mcp add mcp-slack-crunchtools \
--env SLACK_USER_TOKEN=xoxp-your-token \
-- uvx mcp-slack-crunchtools
Using Container
claude mcp add mcp-slack-crunchtools \
--env SLACK_USER_TOKEN=xoxp-your-token \
-- podman run -i --rm -e SLACK_USER_TOKEN quay.io/crunchtools/mcp-slack
Local Development
claude mcp add mcp-slack-crunchtools \
--env SLACK_USER_TOKEN=xoxp-your-token \
-- uv run mcp-slack-crunchtools
Setup
See CLAUDE.md for detailed instructions on creating a Slack app and obtaining a User OAuth Token.
Tools
| Tool | Description |
|---|---|
slack_auth_test | Test connection and get token owner info |
slack_list_channels | List workspace channels |
slack_get_channel_info | Get channel details |
slack_get_channel_history | Read channel messages |
slack_get_thread_replies | Read thread replies |
slack_list_channel_members | List channel members |
slack_search_messages | Search messages |
slack_get_reactions | Get message reactions |
slack_list_reactions | List user's reactions |
slack_list_stars | List starred items |
slack_get_user_info | Get user details |
slack_list_users | List workspace members |
slack_get_user_profile | Get user profile |
slack_list_files | List files (metadata only) |
slack_get_file_info | Get file metadata |
Security
See SECURITY.md for the full security design document.
License
AGPL-3.0-or-later
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