slack-mcp-server: The most powerful MCP Slack Server with no permission requirements, Apps support, GovSlack, DMs, Group DMs

by korotovsky · MCP Server · ★ 1.8k

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

Security audit verdict: SAFE · quality 62/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours. Full audit →

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

assistantsgovslackllmmcpmcp-serverslackslack-api

Quick Facts

Stars1,838
Forks370
LanguageGo
CategoryMCP Server
LicenseMIT
Quality Score62/100
Open Issues74
Last Updated2026-07-16
Created2025-04-12
Platformsgo, mcp
Est. Tokens~22k

About slack-mcp-server

Slack MCP Server Model Context Protocol (MCP) server for Slack Workspaces. The most powerful MCP Slack server — supports Stdio, SSE and HTTP transports, proxy settings, DMs, Group DMs, Smart History fetch (by date or count), may work via OAuth or in complete stealth mode with no permissions and scopes in Workspace 😏.

Compatible Skills

These tools work well together with slack-mcp-server for enhanced workflows:

  • slackdump — semantic(0.43)+rare_topics+same_lang+similar_pop+shared_platform (50%)
  • slack-mcp-client — semantic(0.43)+rare_topics+same_lang+similar_pop+shared_platform (50%)

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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