MCP server

PaperAgent — Send Physical Mail Official

dev.paperagent/letters

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

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

Website

At a glance

Type

MCP server

Publisher

paperagent.dev (verified by the MCP Registry)

Status

Working at last check

Tools

8

Token cost

About 3,079 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.letters]
url = "https://paperagent.dev/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"letters":{"type":"http","url":"https://paperagent.dev/mcp"}}}

Antigravity

agy mcp add letters https://paperagent.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"letters","server_url":"https://paperagent.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"letters","server_url":"https://paperagent.dev/mcp"}

Tools

• create_draft ~980 tokens
  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
• get_letter_status ~163 tokens
  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
• get_pricing ~182 tokens
  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
• list_letters ~160 tokens
  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.
• preview_draft ~171 tokens
  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 Sends messages · ~392 tokens
  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
• update_draft ~623 tokens
  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
• validate_address ~408 tokens
  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

Browse

• Claude tools
• PDF tools
• Converting to Markdown
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• SMS and text messages

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