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How to install Summer Engine 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 Summer Engine by running "gemini mcp add summer-engine npx -y summer-engine", then type /mcp to check it.
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Run the install command
In a terminal, run:
gemini mcp add summer-engine npx -y summer-engine - 2
Check it
Inside Gemini CLI, type /mcp to list servers and tools.
MCP servers run with your permissions. If Summer Engine needs an API key, add it under env in the config. Check its README.
Install Summer Engine in another app
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Questions
Does Summer Engine work in Gemini CLI?
Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and Summer Engine installs with the steps above.
Summer Engine 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 Summer Engine safe?
It scores 87 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.