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How to install Line Harness MCP Server 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 Line Harness MCP Server by running "gemini mcp add line-harness-mcp-server npx -y @line-harness/mcp-server", then type /mcp to check it.

Built from the published package · server updated yesterday

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add line-harness-mcp-server npx -y @line-harness/mcp-server
  2. 2

    Check it

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

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

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Questions

Does Line Harness MCP Server work in Gemini CLI?

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

Line Harness MCP Server 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 Line Harness MCP Server safe?

It scores 85 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.