Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, a

slack-mcp

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Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, and triple-mode auth.

One process, N workspaces, every write goes through draft → confirm. Built because the existing Slack MCP servers are single-workspace per instance and the Anthropic reference impl was deprecated.

Why use this over the alternatives

Install

Open Claude Code, paste:

/plugin marketplace add adelaidasofia/slack-mcp /plugin install slack-mcp@slack-mcp

Then fill in tokens in .env (see SETUP.md for cookie extraction walkthrough).

Legacy install

git clone https://github.com/adelaidasofia/slack-mcp.git ~/.claude/slack-mcp
cd ~/.claude/slack-mcp
pip3 install --break-system-packages -r requirements.txt
cp .env.example .env
# fill in tokens — see SETUP.md for cookie extraction walkthrough

Register in your project .mcp.json (or via claude mcp add -s user):

{
  "mcpServers": {
    "slack": {
      "command": "python3",
      "args": ["-m", "slack_mcp.server"],
      "cwd": "/Users/YOU/.claude/slack-mcp"
    }
  }
}

Restart Claude Code, then run claude mcp list to verify slack shows up.

Tools (v0.1.1)

Meta: list_workspaces, healthcheck

Read: listchannels, searchchannels, readchannel, readthread, listusers, searchusers, getuserprofile, search_messages

Write (draft+confirm): sendmessage → confirmsend, sendreplyquote → confirmsend, updateownmessage → confirmsend, cancel_draft

Write (low-consequence, immediate): addreaction, markread, deleteownmessage

Auth modes

Cookie extraction takes ~3 minutes per workspace. See SETUP.md.

Vault auto-export

Shortened. The full README is on GitHub.