PaperAgent — Send Physical Mail

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dev.paperagent/lettersv0.1.0 Domain verified

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

Communication

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https://paperagent.dev/mcp

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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 split a longer document into two letters, because a body that renders to 7 or more pages is refused rather than trimmed. This is NOT email, fax or text message — nothing reaches the recipient electronically, and the only way this letter arrives is on paper in an envelope. The body is plain text or Markdown. The draft freezes the content and the price for 24 hours and costs nothing; no paper is printed and no postage is bought until send_letter is called. US domestic addresses only. Call preview_draft next so the user can see the letter and the total.

toobject, required

Who the letter is mailed to.

body_markdownstring, required

The text of the letter, as plain text or Markdown. It must render to 6 printed pages or fewer — roughly 2,400 words of body text.

tierstring

Defaults to standard. Call get_pricing first and pass a tier it lists: standard is a plain First-Class letter. certified, certified_err, proof_of_mailing and registered are other products the current price card may not sell, and a tier it does not sell is refused, not substituted — so do not describe one to the user until get_pricing has listed it.

colourboolean

Omit this. The current price card prints every letter black & white, so passing true is refused rather than billed — call get_pricing for what it does sell. The field remains because letters priced on an older card carry it.

body_fileobject

A file the user attached, as the host delivers it. Not accepted yet — create_draft refuses an attachment and asks for the letter as body_markdown text.

from_address_idstring

Omit this. The account's own verified return address is used by default; only pass an id the account holder gave you.

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

I understand, run it anyway

Try it

Call this server's tools from your browser. Nothing to install.

https://paperagent.dev/mcp

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

create_draft

toobject, required

Who the letter is mailed to.

body_markdownstring, required

The text of the letter, as plain text or Markdown. It must render to 6 printed pages or fewer — roughly 2,400 words of body text.

tierstring

colourboolean

body_fileobject

A file the user attached, as the host delivers it. Not accepted yet — create_draft refuses an attachment and asks for the letter as body_markdown text.

from_address_idstring

Omit this. The account's own verified return address is used by default; only pass an id the account holder gave you.

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

I understand, run it anyway

Tools (8)

create_draft

Argument	Type	Description
to*	object	Who the letter is mailed to.
tier	string	Defaults to standard. Call get_pricing first and pass a tier it lists: standard is a plain First-Class letter. certified, certified_err, proof_of_mailing and registered are other products the current price card may not sell, and a tier it does not sell is refused, not substituted — so do not describe one to the user until get_pricing has listed it.
colour	boolean	Omit this. The current price card prints every letter black & white, so passing true is refused rather than billed — call get_pricing for what it does sell. The field remains because letters priced on an older card carry it.
body_file	object	A file the user attached, as the host delivers it. Not accepted yet — create_draft refuses an attachment and asks for the letter as body_markdown text.
body_markdown*	string	The text of the letter, as plain text or Markdown. It must render to 6 printed pages or fewer — roughly 2,400 words of body text.
from_address_id	string	Omit this. The account's own verified return address is used by default; only pass an id the account holder gave you.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "to",
    "body_markdown"
  ],
  "properties": {
    "to": {
      "type": "object",
      "required": [
        "name",
        "line1",
        "city",
        "state",
        "postal_code"
      ],
      "properties": {
        "city": {
          "type": "string",
          "minLength": 1
        },
        "name": {
          "type": "string",
          "minLength": 1,
          "description": "The person or company the letter is addressed to."
        },
        "line1": {
          "type": "string",
          "minLength": 1,
          "description": "Street number and street name, or PO box."
        },
        "line2": {
          "type": "string",
          "description": "Apartment, suite, floor or unit."
        },
        "state": {
          "type": "string",
          "maxLength": 2,
          "minLength": 2,
          "description": "Two-letter US state or territory code, such as NY."
        },
        "postal_code": {
          "type": "string",
          "description": "Five-digit ZIP or ZIP+4, such as 10001 or 10001-2345."
        }
      },
      "description": "Who the letter is mailed to."
    },
    "tier": {
      "enum": [
        "standard",
        "proof_of_mailing",
        "certified",
        "certified_err",
        "registered"
      ],
      "type": "string",
      "description": "Defaults to standard. Call get_pricing first and pass a tier it lists: standard is a plain First-Class letter. certified, certified_err, proof_of_mailing and registered are other products the current price card may not sell, and a tier it does not sell is refused, not substituted — so do not describe one to the user until get_pricing has listed it."
    },
    "colour": {
      "type": "boolean",
      "description": "Omit this. The current price card prints every letter black & white, so passing true is refused rather than billed — call get_pricing for what it does sell. The field remains because letters priced on an older card carry it."
    },
    "body_file": {
      "type": "object",
      "required": [
        "download_url",
        "file_id"
      ],
      "properties": {
        "file_id": {
          "type": "string",
          "description": "The host's identifier for the uploaded file."
        },
        "file_name": {
          "type": "string",
          "description": "The name the file was uploaded under."
        },
        "mime_type": {
          "type": "string",
          "description": "The file's media type, e.g. application/pdf."
        },
        "download_url": {
          "type": "string",
          "description": "A short-lived URL the file can be fetched from."
        }
      },
      "description": "A file the user attached, as the host delivers it. Not accepted yet — create_draft refuses an attachment and asks for the letter as body_markdown text."
    },
    "body_markdown": {
      "type": "string",
      "minLength": 1,
      "description": "The text of the letter, as plain text or Markdown. It must render to 6 printed pages or fewer — roughly 2,400 words of body text."
    },
    "from_address_id": {
      "type": "string",
      "description": "Omit this. The account's own verified return address is used by default; only pass an id the account holder gave you."
    }
  }
}

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 the status itself says so. This creates nothing and mails nothing.

read-only

Argument	Type	Description
letter_id*	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "letter_id"
  ],
  "properties": {
    "letter_id": {
      "type": "string"
    }
  }
}

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 printing — so quote the tier total and say New York sales tax is added, whatever the destination. Call this before telling a user what a letter will cost. This creates nothing and mails nothing.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {}
}

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.

read-only

Argument	Type	Description
limit	integer	Defaults to 20.
starting_after	string	The next_cursor from the previous call, to read the following page.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "limit": {
      "type": "integer",
      "maximum": 100,
      "minimum": 1,
      "description": "Defaults to 20."
    },
    "starting_after": {
      "type": "string",
      "description": "The next_cursor from the previous call, to read the following page."
    }
  }
}

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 number send_letter requires as confirm_total_cents. This does not create an order or mail a letter.

Argument	Type	Description
draft_id*	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "draft_id"
  ],
  "properties": {
    "draft_id": {
      "type": "string"
    }
  }
}

send_letter

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 document to a street address. This is NOT email — use an email tool for email. US domestic addresses only. Requires a draft_id from create_draft and confirm_total_cents matching the current quote. The letter becomes irreversible once we print it.

destructive

Argument	Type	Description
draft_id*	string	The draft_id returned by create_draft or preview_draft.
idempotency_key*	string	A key you generate once for this send. Retrying with the same draft_id and the same key returns the original letter instead of mailing a second one.
confirm_total_cents*	integer	The exact total.amount_cents from the current quote, including sales tax. Say the total out loud to the user first; if it does not match the live quote this call fails and no letter is sent.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "draft_id",
    "confirm_total_cents",
    "idempotency_key"
  ],
  "properties": {
    "draft_id": {
      "type": "string",
      "description": "The draft_id returned by create_draft or preview_draft."
    },
    "idempotency_key": {
      "type": "string",
      "minLength": 1,
      "description": "A key you generate once for this send. Retrying with the same draft_id and the same key returns the original letter instead of mailing a second one."
    },
    "confirm_total_cents": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "The exact total.amount_cents from the current quote, including sales tax. Say the total out loud to the user first; if it does not match the live quote this call fails and no letter is sent."
    }
  }
}

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 renders to 7 or more pages is refused and the draft is left as it was. This creates nothing and mails nothing.

Argument	Type	Description
to	object	A complete US postal address. US domestic addresses only.
tier	string	Which product to buy. Call get_pricing first and pass a tier it lists: standard is a plain First-Class letter. certified, certified_err, proof_of_mailing and registered are other products the current price card may not sell, and a tier it does not sell is refused rather than substituted — so do not describe one to the user until get_pricing has listed it.
colour	boolean	Omit this. The current price card prints black & white only; true is refused.
draft_id*	string	The draft_id returned by create_draft.
body_markdown	string	Replaces the whole letter text. It must render to 6 printed pages or fewer — roughly 2,400 words of body text.
from_address_id	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "draft_id"
  ],
  "properties": {
    "to": {
      "type": "object",
      "required": [
        "name",
        "line1",
        "city",
        "state",
        "postal_code"
      ],
      "properties": {
        "city": {
          "type": "string",
          "minLength": 1
        },
        "name": {
          "type": "string",
          "minLength": 1,
          "description": "The person or company the letter is addressed to."
        },
        "line1": {
          "type": "string",
          "minLength": 1,
          "description": "Street number and street name, or PO box."
        },
        "line2": {
          "type": "string",
          "description": "Apartment, suite, floor or unit."
        },
        "state": {
          "type": "string",
          "maxLength": 2,
          "minLength": 2,
          "description": "Two-letter US state or territory code, such as NY."
        },
        "postal_code": {
          "type": "string",
          "description": "Five-digit ZIP or ZIP+4, such as 10001 or 10001-2345."
        }
      },
      "description": "A complete US postal address. US domestic addresses only."
    },
    "tier": {
      "enum": [
        "standard",
        "proof_of_mailing",
        "certified",
        "certified_err",
        "registered"
      ],
      "type": "string",
      "description": "Which product to buy. Call get_pricing first and pass a tier it lists: standard is a plain First-Class letter. certified, certified_err, proof_of_mailing and registered are other products the current price card may not sell, and a tier it does not sell is refused rather than substituted — so do not describe one to the user until get_pricing has listed it."
    },
    "colour": {
      "type": "boolean",
      "description": "Omit this. The current price card prints black & white only; true is refused."
    },
    "draft_id": {
      "type": "string",
      "description": "The draft_id returned by create_draft."
    },
    "body_markdown": {
      "type": "string",
      "minLength": 1,
      "description": "Replaces the whole letter text. It must render to 6 printed pages or fewer — roughly 2,400 words of body text."
    },
    "from_address_id": {
      "type": "string"
    }
  }
}

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 rather than from an earlier tool result. Requires a complete street address: this does not look up, append or find an address from a name, and it does not handle addresses outside the United States. This creates nothing and mails nothing.

read-only

Argument	Type	Description
address*	object	A complete US postal address. US domestic addresses only.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "address"
  ],
  "properties": {
    "address": {
      "type": "object",
      "required": [
        "name",
        "line1",
        "city",
        "state",
        "postal_code"
      ],
      "properties": {
        "city": {
          "type": "string",
          "minLength": 1
        },
        "name": {
          "type": "string",
          "minLength": 1,
          "description": "The person or company the letter is addressed to."
        },
        "line1": {
          "type": "string",
          "minLength": 1,
          "description": "Street number and street name, or PO box."
        },
        "line2": {
          "type": "string",
          "description": "Apartment, suite, floor or unit."
        },
        "state": {
          "type": "string",
          "maxLength": 2,
          "minLength": 2,
          "description": "Two-letter US state or territory code, such as NY."
        },
        "postal_code": {
          "type": "string",
          "description": "Five-digit ZIP or ZIP+4, such as 10001 or 10001-2345."
        }
      },
      "description": "A complete US postal address. US domestic addresses only."
    }
  }
}