Letter IRL for Zed

com.letterirl/letter-irl

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

client:Zed transport:streamable-http

Install Letter IRL in Zed

~/.config/zed/settings.json · windows: %APPDATA%\Zed\settings.json

{
  "context_servers": {
    "letter-irl": {
      "url": "https://api.letterirl.com/mcp"
    }
  }
}

Merge this into your existing settings object — do not replace the file. Zed docs