Subdomain API for Gemini CLI

app.subdomain/subdomains

Find known subdomains of a domain. Passive data; may include historic entries. List or count.

client:Gemini CLI transport:streamable-http tools:2

Install Subdomain API in Gemini CLI

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

{
  "mcpServers": {
    "subdomains": {
      "httpUrl": "https://api.subdomain.app/mcp"
    }
  }
}

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