WARDEN by AIMarket — MCP tool firewall for Gemini CLI

io.github.alexar76/warden

MCP security firewall: stdio wrap proxy or inspection tools; zero runtime dependencies.

client:Gemini CLI transport:stdio runtime:npm

Install WARDEN by AIMarket — MCP tool firewall in Gemini CLI

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

{
  "mcpServers": {
    "warden": {
      "command": "npx",
      "args": [
        "-y",
        "@aimarket/warden"
      ]
    }
  }
}

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