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How to install agent-harnesses 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 agent-harnesses by running "gemini mcp add agent-harnesses uvx agent-harnesses-mcp", then type /mcp to check it.

Built from the published package · server updated 3 days ago

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add agent-harnesses uvx agent-harnesses-mcp
  2. 2

    Check it

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

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

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Questions

Does agent-harnesses work in Gemini CLI?

Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and agent-harnesses installs with the steps above.

agent-harnesses does not show up in Gemini CLI. What now?

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

Is agent-harnesses safe?

It scores 86 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.