How to install Harness MCP V2 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 Harness MCP V2 by running "gemini mcp add harness-mcp-v2 npx -y harness-mcp-v2", then type /mcp to check it.

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Run the install command

In a terminal, run:

gemini mcp add harness-mcp-v2 npx -y harness-mcp-v2

2
Check it
Inside Gemini CLI, type /mcp to list servers and tools.

MCP servers run with your permissions. If Harness MCP V2 needs an API key, add it under env in the config. Check its README.

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Questions

Does Harness MCP V2 work in Gemini CLI?

Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and Harness MCP V2 installs with the steps above.

Harness MCP V2 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 Harness MCP V2 safe?

It scores 82 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.