How to install Devharness 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 Devharness by running "gemini mcp add devharness npx -y devharness", then type /mcp to check it.

Built from the published package · server updated 11 days ago

1
Run the install command
In a terminal, run:
```
gemini mcp add devharness npx -y devharness
```
2
Check it
Inside Gemini CLI, type /mcp to list servers and tools.

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

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Questions

Does Devharness work in Gemini CLI?

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

Devharness 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 Devharness safe?

It scores 80 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.

Run the install command

Check it

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Questions