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PaperAgent — Send Physical Mail

dev.paperagent/letters · v0.1.0

Measured by MCP Station

Instruction-like text was found in get_letter_status. This is a pattern match, not a verdict. What we look for

Description written by the publisher, not verified

Mail one-off USPS letters from ChatGPT or Claude after you approve the preview and price. US only.

Connect

claude mcp add --transport http letters https://paperagent.dev/mcp

{
  "mcpServers": {
    "letters": {
      "url": "https://paperagent.dev/mcp"
    }
  }
}

Tools as reported by the server

• get_pricing
  Return the published price list for mailing physical letters through USPS: the products on sale, what each one costs, how many pages it covers, and when sales tax applies. Amounts are in US cents. Every letter is one of these prices — there is no volume discount, no per-page charge and no colour pri
• validate_address
  Check a US postal address and return it in the normalized form the envelope will be printed with, plus any warnings. The address is checked against the Google Address Validation service, which receives the address and nothing else. Use this before create_draft whenever the address came from a person
• create_draft
  Create a draft of a physical letter to be printed on paper and mailed through USPS, and return its draft_id, page count and total price. A letter is at most 6 printed pages, at the same price whatever its length: up to 3 pages print one-sided, 4 to 6 print on both sides. Write the body to fit, or sp
• update_draft
  Change the recipient, body, tier or colour of a draft that has not been sent, and re-price it. Returns a new page count and a new quote, so the previous total is void — state the new total to the user before sending. The 6-printed-page maximum applies to the new body as well: a replacement that rend
• preview_draft
  Return a link to the rendered PDF of a draft together with its page count and current total price. Refreshes the stored price quote when pricing has changed. Use this to show the user exactly what will be printed and exactly what it costs before calling send_letter. The total in the response is the
• send_letter write/delete
  Create an order for a real, physical letter through the United States Postal Service. It returns a payment link; no paper is printed, postage is bought, or letter is mailed until payment completes. Use this whenever the user asks to mail, post, send by post, or physically send a letter, notice, or d
• get_letter_status
  Return the current state of one letter: where it is, the date it goes to USPS, and the estimated delivery date. USPS does not scan plain First-Class letters at delivery, so a Standard letter ends at an expected delivery date and never reports delivery — do not tell the user a letter arrived unless t
• list_letters
  Return this account's letters, newest first, with the status, mail date and total for each. Use this to answer questions about what has already been sent. This creates nothing, changes nothing and mails nothing.

Website · JSON · Text for agents · Registry updated 2026-10-18