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slack

slack is an MCP server for Claude Code from jeremylongshore/claude-code-slack-channel. Its token cost is not measured, scanned A, original, Apache-2.0.

A server configuration that gives Claude Code access to the Slack connection used by the slack-channel add-on. MCP is a standard way for an AI tool to connect to external services.

In plain words
What is it for?
Starting the Slack server process that handles communication between Claude Code and Slack.
Why use it?
It supplies the running Slack service Claude Code needs to exchange messages with Slack.

MCP server for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: listed in a Claude config.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the slack-channel plugin — 4 skills, 1 command, 1 MCP server shipped together

not rated 39repo +1 today A scan tokens not measured original Apache-2.0

Good fit Starting the Slack server process that handles communication between Claude Code and Slack.

Compare 6 mcp servers from other repositories ↓
View source ↗ jeremylongshore/claude-code-slack-channel jeremylongshore.github.io
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add jeremylongshore/claude-code-slack-channel
Claude Code
/plugin install slack-channel

Made for: Claude Code.

Or install slack-channel, the plugin that ships this one along with the rest of its 4 skills, 1 command, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for slack

README.md
[![agentmods](https://agentmods.dev/badge/mcp/jeremylongshore/claude-code-slack-channel/slack/github.svg)](https://agentmods.dev/mcp/jeremylongshore/claude-code-slack-channel/slack)
Your own site
<a href="https://agentmods.dev/mcp/jeremylongshore/claude-code-slack-channel/slack"><img src="https://agentmods.dev/badge/mcp/jeremylongshore/claude-code-slack-channel/slack/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for slack

Your own site · 80×15
<a href="https://agentmods.dev/mcp/jeremylongshore/claude-code-slack-channel/slack"><img src="https://agentmods.dev/badge/mcp/jeremylongshore/claude-code-slack-channel/slack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

slack scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.mcp.json · 8 lines

What it actually says

{
  "slack": {
    "command": "${CLAUDE_PLUGIN_ROOT}/node_modules/.bin/tsx",
    "args": [
      "${CLAUDE_PLUGIN_ROOT}/server.ts"
    ]
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 8 lines scan A 4b06c07430d7

Subscribe to this mod's changes

slack is an MCP server published in the GitHub repository jeremylongshore/claude-code-slack-channel (39 stars, last pushed today), licensed Apache-2.0. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude Codeanthropicchannelchatopsclaudemcp
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