mailbox for Gemini CLI

bot.mailbox/mailbox

Physical mail API for AI agents. Send letters, certified mail. Sandbox + live keys via MCP.

client:Gemini CLI transport:streamable-http tools:45

Install mailbox in Gemini CLI

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

{
  "mcpServers": {
    "mailbox": {
      "httpUrl": "https://mailbox.bot/api/mcp"
    }
  }
}

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