How to install Runtime in Antigravity CLI
To install Runtime in Antigravity CLI, add the "runtime" block to the mcpServers section of ~/.gemini/config/mcp_config.json (remote servers use "serverUrl"), then start agy.
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- 1
Open the MCP config
Create or open ~/.gemini/config/mcp_config.json for every project, or .agents/mcp_config.json for this project only.
- 2
Add the server
Paste this. If the file already has servers, add the "runtime" entry inside the existing mcpServers block.
{ "mcpServers": { "runtime": { "command": "npx", "args": [ "-y", "@reactive-skills/runtime" ] } } } - 3
Start Antigravity CLI
Run agy. The server and its tools load when the session starts.
Config file: ~/.gemini/config/mcp_config.json (all projects) or .agents/mcp_config.json (this project)
MCP servers run with your permissions. If Runtime needs an API key, add it under env in the config. Check its README.
Install Runtime in another app
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Questions
Does Runtime work in Antigravity CLI?
Yes. Antigravity CLI supports local and remote mcp servers, skills, plugins, and Runtime installs with the steps above.
Runtime does not show up in Antigravity CLI. What now?
Restart Antigravity CLI fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.
Is Runtime safe?
It scores 76 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.
