slack-mcp-server

Item: slack-mcp-server
Rating: 53
Author: M8ven

The most powerful MCP Slack Server with no permission requirements, Apps support, GovSlack, DMs, Group DMs and smart history fetch logic.

→ korotovsky/slack-mcp-server · listed on github_topic

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Claim it to get a verified publisher badge, a free copy of our full audit findings, and direct contact for any high-priority issues we find.

Install from

GitHub npm mcp.so

M8ven verifies MCPs across every public registry — install directly from whichever one you prefer.

// key findings

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

🔐

You'll be asked for 4 credentials: SLACK_MCP_XOXB_TOKEN, SLACK_MCP_XOXC_TOKEN, SLACK_MCP_XOXD_TOKEN, SLACK_MCP_XOXP_TOKEN

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configSLACK_MCP_ADD_MESSAGE_TOOL

configSLACK_MCP_DXT

🔐 secretSLACK_MCP_XOXB_TOKEN— Yes nil Bot token (xoxb-...) — alternative to xoxp/xoxc/xoxd. Bot has limited access (invited channels only, no search)

🔐 secretSLACK_MCP_XOXC_TOKEN— Yes nil Slack browser token (xoxc-...)

🔐 secretSLACK_MCP_XOXD_TOKEN— Yes nil Slack browser cookie d (xoxd-...)

🔐 secretSLACK_MCP_XOXP_TOKEN— Yes nil User OAuth token (xoxp-...) — alternative to xoxc/xoxd

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 2 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/korotovsky-slack-mcp-server-1nm301)](https://m8ven.ai/mcp/korotovsky-slack-mcp-server-1nm301)

commit: b88c0de3f706f4f07337c9eda7133c736d1c9524

code hash: b558ae2da1bf8a2fa36422dc39a7615810abcae13c33641b72aef65d995ce6b7

verified: 6/14/2026, 10:38:27 AM

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