Letter IRL for Gemini CLI

com.letterirl/letter-irl

Write, preview and mail real letters and postcards to US addresses from your AI app.

client:Gemini CLI transport:streamable-http

Install Letter IRL in Gemini CLI

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

{
  "mcpServers": {
    "letter-irl": {
      "httpUrl": "https://api.letterirl.com/mcp"
    }
  }
}

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