Letter IRL for Claude Code

com.letterirl/letter-irl

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

client:Claude Code transport:streamable-http

Install Letter IRL in Claude Code

run in your project directory

claude mcp add --transport http letter-irl https://api.letterirl.com/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs