How to install SandBase Harness 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 SandBase Harness by running "gemini mcp add sandbase-harness docker run -i --rm -e MANAGED_AGENTS_URL ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8", then type /mcp to check it.

Built from the published package · server updated 3 days ago

Run the install command

In a terminal, run:

gemini mcp add sandbase-harness docker run -i --rm -e MANAGED_AGENTS_URL ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8

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

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

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Questions

Does SandBase Harness work in Gemini CLI?

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

SandBase Harness 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 SandBase Harness safe?

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