# Agent Letter Desk

> A remote MCP server that mails paper letters for the user of an AI agent (Claude, ChatGPT; Meta Muse later). The agent writes the letter with the user; the server checks it, lays it out, shows a PDF preview and the price, and mails it in the name of the signed-in account holder after the user approves. Test mode: no letter goes into the mail, and no money is charged.

- MCP server URL: https://agentletterdesk.com/mcp (Streamable HTTP, OAuth 2.1)
- Destinations: 31 countries. Within the United States by USPS Certified Mail; to 30 European countries from Europe or the US.
- Proof of delivery only to United States, Belgium, Germany and Spain. All other routes have no tracking and no proof.
- Prices are quoted per letter by prepare_letter. Nothing is charged in test mode.

## For AI agents

1. Connect to the MCP server at https://agentletterdesk.com/mcp (Streamable HTTP). It uses OAuth 2.1: the user signs in on our page and approves the access.
2. Call get_account first. The sender of every letter is the account holder. Use the default sender address.
3. Write the letter with the user. Ask the user for every name, number, date and address. Do not use placeholders or example values.
4. Call prepare_letter. It checks the letter, lays it out and returns a PDF preview link and the price.
5. Show the user the preview link, the recipient, the postal service and the price. Say so when the route has no proof of delivery.
6. Wait for the user’s clear yes. Do not call send_letter in the same answer as prepare_letter.
7. Call send_letter with the letter_id, the recipient name, the price and the number of enclosures that the user approved.
8. Give the user the status and the tracking number. Call cancel_letter if the user wants to stop the letter before printing.

This is a test system. Tell the user that no letter goes into the mail and that nothing is charged.

## Docs

- [Full facts for agents](https://agentletterdesk.com/llms-full.txt): tools, routes, prices, rules, sign-in and privacy in one file
- [Home page](https://agentletterdesk.com/index.md): what the service does, how to connect, where letters go
- [Privacy policy](https://agentletterdesk.com/privacy.md): what is stored and for how long
- [Terms of the test](https://agentletterdesk.com/terms.md): no mail, no charge, no warranty, no legal advice
- [Support](https://agentletterdesk.com/support.md): help, cancel a letter, disconnect an app, delete the account

## Discovery

- [MCP server card](https://agentletterdesk.com/mcp/server-card): name, version and endpoint (SEP-2127)
- [AI catalog](https://agentletterdesk.com/.well-known/ai-catalog.json): points to the server card
- [OAuth protected resource metadata](https://agentletterdesk.com/.well-known/oauth-protected-resource/mcp)

## Optional

- [Imprint](https://agentletterdesk.com/imprint.md): who runs the service
- [Sitemap](https://agentletterdesk.com/sitemap.xml)