FetchSandbox for Gemini CLI

io.github.fetchsandbox/mcp

A deterministic verification engine for agents. Proves a fix: fails on the old code, passes on new.

client:Gemini CLI transport:streamable-http runtime:npm tools:17

Install FetchSandbox in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

{
  "mcpServers": {
    "mcp": {
      "httpUrl": "https://fetchsandbox.com/mcp/v1"
    }
  }
}

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs