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How to install Slack MCP User in Gemini CLI

Gemini CLI was replaced by Antigravity CLI in June 2026. On an enterprise licence or paid API key you can still install Slack MCP User by running "gemini mcp add slack-mcp-user npx -y slack-mcp-user", then type /mcp to check it.

Built from the published package · server updated 1 month ago

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add slack-mcp-user npx -y slack-mcp-user
  2. 2

    Check it

    Inside Gemini CLI, type /mcp to list servers and tools.

MCP servers run with your permissions. If Slack MCP User needs an API key, add it under env in the config. Check its README.

Install Slack MCP User in another app

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Questions

Does Slack MCP User work in Gemini CLI?

Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and Slack MCP User installs with the steps above.

Slack MCP User does not show up in Gemini CLI. What now?

Restart Gemini CLI fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.

Is Slack MCP User safe?

It scores 45 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.