Every change Wellknown observed on this MCP server, newest first, with what it was before and what it became. Tool-surface changes carry the definition diff. Nothing here is edited after the fact.
Changed the definition of "cancel_order", "create_letter", "create_postcard" and 3 more
{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":{},"properties":{"batch":{"additionalProperties":false,"description":"Present when the order was created with recipients: the whole group. The top-level fields describe the first recipient's order; use batch.price and batch.checkout_url for the total and payment.","properties":{"checkout_url":{"description":"One payment link for every unpaid order in the group","type":["string","null"]},"count":{"description":"How many recipients (one order each)","type":"number"},"discount":{"anyOf":[{"additionalProperties":false,"properties":{"amount_cents":{"type":"number"},"display":{"type":"string"},"reason":{"type":"string"}},"required":["amount_cents","display","reason"],"type":"object"},{"type":"null"}]},"id":{"type":"string"},"price":{"additionalProperties":false,"description":"Total for the whole group","properties":{"amount_cents":{"type":"number"},"currency":{"type":"string"},"display":{"type":"string"}},"required":["amount_cents","currency","display"],"type":"object"},"url":{"description":"Group page listing every recipient","type":"string"}},"required":["id","count","url","checkout_url","price","discount"],"type":"object"},"certified":{"description":"none, certified or ⟨65 unchanged words⟩ ":"Order status page","type":"string"},"orders":{"description":"Every order in the group, when created with recipients","items":{"additionalProperties":false,"properties":{"id":{"type":"string"},"order_url":{"type":"string"},"preview_url":{"type":"string"},"to":{"type":"string"}},"required":["id","to","order_url","preview_url"],"type":"object"},"type":"array"},"preview_url":{"description":"Exact print ⟨98 unchanged words⟩
Create a printed letter order (up to 3 pages,8.5x11, mailed in a #10 envelope) and get a payment link.MailsEitheronlywriteafterit (content.body, up to ~3 pages, optional photo) or mail theuseruser'spays.own PDF (content.pdf_url, a public https link, up to 6 pages). Set certified to "certified"($14.99)for USPS Certified Mail with tracking and proof of delivery, or "certified_return_receipt"($19.99)to add the recipient's signature; use these when the user needs proof (landlordtax notice replies, lease notices,legaldisputes,ordemand
⟨6 unchanged words⟩ or 6x11) and get a payment link.TheFrontfrontlayouts:isaanbigimageheadlineURLon a color, one photo, a photo with a caption, or abigcollageheadline;of 2-4 photos; the back carries the message (handwriting, serif or sans) and addresses. Set express for USPS Priority Mail (2-3 days, tracked). Mails only after the user pays.
{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":{},"properties":{"batch":{"additionalProperties":false,"description":"Present when the order was created with recipients: the whole group. The top-level fields describe the first recipient's order; use batch.price and batch.checkout_url for the total and payment.","properties":{"checkout_url":{"description":"One payment link for every unpaid order in the group","type":["string","null"]},"count":{"description":"How many recipients (one order each)","type":"number"},"discount":{"anyOf":[{"additionalProperties":false,"properties":{"amount_cents":{"type":"number"},"display":{"type":"string"},"reason":{"type":"string"}},"required":["amount_cents","display","reason"],"type":"object"},{"type":"null"}]},"id":{"type":"string"},"price":{"additionalProperties":false,"description":"Total for the whole group","properties":{"amount_cents":{"type":"number"},"currency":{"type":"string"},"display":{"type":"string"}},"required":["amount_cents","currency","display"],"type":"object"},"url":{"description":"Group page listing every recipient","type":"string"}},"required":["id","count","url","checkout_url","price","discount"],"type":"object"},"certified":{"description":"none, certified or ⟨65 unchanged words⟩ ":"Order status page","type":"string"},"orders":{"description":"Every order in the group, when created with recipients","items":{"additionalProperties":false,"properties":{"id":{"type":"string"},"order_url":{"type":"string"},"preview_url":{"type":"string"},"to":{"type":"string"}},"required":["id","to","order_url","preview_url"],"type":"object"},"type":"array"},"preview_url":{"description":"Exact print ⟨98 unchanged words⟩
{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":false,"properties":{"first_order_discountexpress":{"additionalProperties":false,"description":"Surcharge for express delivery","properties":{"amount_cents":{"type":"number" ⟨5 unchanged words⟩ ,"description"],"type":"object"},"first_order_discount":{"additionalProperties":false,"description":"Current first-order discount (0 when none)","properties":{"description":{"type":"string"},"percent":{"type":"number"}},"required":["percent","description"],"type":"object"},"letter_photo":{"additionalProperties":false,"description":"Surcharge for a letterwithprinted in color (a photo,(printsorina PDF with color on)","properties":{"amount_cents":{"type" ⟨36 unchanged words⟩ ,"currency"],"type":"object"},"pdf_letters":{"additionalProperties":false,"description":"Mailing your own PDF as a letter","properties":{"description":{"type":"string"},"max_pages":{"type":"number"}},"required":["max_pages","description"],"type":"object"},"
⟨16 unchanged words⟩ to at least the order amount in USD. For an order created with recipients, this pays for the whole group at once (scope the token to batch.price). On success the order is paid and goes ⟨10 unchanged words⟩
{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":{},"properties":{"batch":{"additionalProperties":false,"description":"Present when the order was created with recipients: the whole group. The top-level fields describe the first recipient's order; use batch.price and batch.checkout_url for the total and payment.","properties":{"checkout_url":{"description":"One payment link for every unpaid order in the group","type":["string","null"]},"count":{"description":"How many recipients (one order each)","type":"number"},"discount":{"anyOf":[{"additionalProperties":false,"properties":{"amount_cents":{"type":"number"},"display":{"type":"string"},"reason":{"type":"string"}},"required":["amount_cents","display","reason"],"type":"object"},{"type":"null"}]},"id":{"type":"string"},"price":{"additionalProperties":false,"description":"Total for the whole group","properties":{"amount_cents":{"type":"number"},"currency":{"type":"string"},"display":{"type":"string"}},"required":["amount_cents","currency","display"],"type":"object"},"url":{"description":"Group page listing every recipient","type":"string"}},"required":["id","count","url","checkout_url","price","discount"],"type":"object"},"certified":{"description":"none, certified or ⟨65 unchanged words⟩ ":"Order status page","type":"string"},"orders":{"description":"Every order in the group, when created with recipients","items":{"additionalProperties":false,"properties":{"id":{"type":"string"},"order_url":{"type":"string"},"preview_url":{"type":"string"},"to":{"type":"string"}},"required":["id","to","order_url","preview_url"],"type":"object"},"type":"array
Certificate recorded, valid to 2026-12-31
Authorization not required
Unknown → Live
First tool surface recorded: 6 tools (server version 1.0.0)
https://sendmypaper.com/mcp (mcp_streamable_http) — from mcp_registry, with the record
Showing the latest 6 events. The API returns up to 500 and filters by kind: ?kind=tool_surface_changed
⟨7 unchanged words⟩ ,"description":"USPS Certified Mail. \"certified\"($14.99): tracking number and proof of mailing and delivery. \"certified_return_receipt\"($19.99): adds the recipient's signature as proof of delivery, which landlords, courts and agencies often require. \"none\"($4.99): regular First-Class. Prices: get_pricing.","enum":["none","certified"," ⟨3 unchanged words⟩ "},"content":{"description":"The letter: body textand(optionallyfontwith a photo) or your own PDF","properties":{"body":{"description":"Full letter text. Plain text; blank lines separate paragraphs. Use this OR pdf_url.","maxLength":9000,"minLength":1,"type":"string"},"color":{"description":"PDF letters only: print in color (costs a little more; see get_pricing). Text letters print in color automatically when they include image_url.","type":"boolean"},"font":{"default":"serif","description":"Typeface for the letter body (text letters)","enum":["serif","sans"],"type":"string"},"image_url":{"description":"OptionalText letters only: optional photo printed at the topof the letter(https JPG or PNG). A letter with ⟨12 unchanged words⟩ ","maxLength":2000,"type":"string"},"pdf_pages":{"description":"Set by Sendpaper: page count of the PDF","maximum":9007199254740991,"minimum":-9007199254740991,"type":"integer"},"requiredpdf_url":[{"description":"Mail your own document instead of body text: a public https link to a PDF (up to 6 pages). Pages are fitted to 8.5×11 and a blank address page is added in front."],"maxLength":2000,"type":"string"}},"type":"object"},"customer_email":{"description":"Where ⟨25 unchanged words⟩ 2,}$","type":"string"},"express":{"default":false,"description":"Send by express (USPS Priority Mail, usually 2–3 days, with tracking) for an extra charge; see get_pricing. Not available with certified.","type":"boolean"},"from":{"description":"Return address; printed on ⟨111 unchanged words⟩ "maxLength":120,"type":"string"},"recipients":{"description":"Send the same piece to several people: 2-25 US addresses, used INSTEAD of to. Each gets their own order and tracking; one payment covers all.","items":{"properties":{"city":{"description":"City","maxLength":40,"minLength":2,"type":"string"},"company":{"description":"Company name, printed under the person's name","maxLength":60,"type":"string"},"line1":{"description":"Street address","maxLength":64,"minLength":3,"type":"string"},"line2":{"description":"Apartment, suite, unit","maxLength":64,"type":"string"},"name":{"description":"Recipient or sender full name","maxLength":60,"minLength":1,"type":"string"},"state":{"description":"Two-letter US state code, e.g. NY","type":"string"},"zip":{"description":"5-digit US ZIP code, or ZIP+4","pattern":"^\\d{5}(-\\d{4})?$","type":"string"}},"required":["name","line1","city","state","zip"],"type":"object"},"maxItems":25,"minItems":2,"type":"array"},"to":{"description":"Recipient's US mailing address (or use recipients for several people)","properties":{"city":{"description": ⟨84 unchanged words⟩ ,"type":"object"}},"required":["to","from","content"],"type":"object"}
{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":{},"properties":{"batch":{"additionalProperties":false,"description":"Present when the order was created with recipients: the whole group. The top-level fields describe the first recipient's order; use batch.price and batch.checkout_url for the total and payment.","properties":{"checkout_url":{"description":"One payment link for every unpaid order in the group","type":["string","null"]},"count":{"description":"How many recipients (one order each)","type":"number"},"discount":{"anyOf":[{"additionalProperties":false,"properties":{"amount_cents":{"type":"number"},"display":{"type":"string"},"reason":{"type":"string"}},"required":["amount_cents","display","reason"],"type":"object"},{"type":"null"}]},"id":{"type":"string"},"price":{"additionalProperties":false,"description":"Total for the whole group","properties":{"amount_cents":{"type":"number"},"currency":{"type":"string"},"display":{"type":"string"}},"required":["amount_cents","currency","display"],"type":"object"},"url":{"description":"Group page listing every recipient","type":"string"}},"required":["id","count","url","checkout_url","price","discount"],"type":"object"},"certified":{"description":"none, certified or ⟨65 unchanged words⟩ ":"Order status page","type":"string"},"orders":{"description":"Every order in the group, when created with recipients","items":{"additionalProperties":false,"properties":{"id":{"type":"string"},"order_url":{"type":"string"},"preview_url":{"type":"string"},"to":{"type":"string"}},"required":["id","to","order_url","preview_url"],"type":"object"},"type":"array"},"preview_url":{"description":"Exact print ⟨98 unchanged words⟩
⟨15 unchanged words⟩ message on the back","properties":{"front_headlinecaption":{"description":"Bigphoto_caption: short textforover a band at thefrontbottomifoftheretheisphoto","maxLength":80,"minLength":1,"type":"string"},"front_headline":{"description":"headlinenolayout:imagebig text for the front, e.g. 'Happy birthday, Sam!'","maxLength": ⟨11 unchanged words⟩ design for the front (JPG or PNG); for photo and photo_caption","maxLength":2000,"type":"string"},"front_images":{"description":"Collage: 2 to 4 https photo URLs, laid out in a grid","items":{"maxLength":2000,"type":"string"},"maxItems":4,"minItems":2,"type":"array"},"front_theme":{"default":"ink","description":"Colorheadline layout: color themefor(ink,asky,text-onlysunset,frontforest, rose, sand, night, mint)","enum":["ink","sky","sunset","forest","rose","sand","night","mint"],"type":"string"},"headline_font":{"default":"serif","description":"Font for the headline or caption: serif, sans or script (handwritten)","enum":["serif","sans","script"],"type":"string"},"layout":{"description":"Front layout: headline (big text on a color), photo (one full-bleed photo), photo_caption (photo with a caption band), collage (2-4 photos). Inferred from the fields when omitted.","enum":["headline","photo","photo_caption","collage"],"type":"string"},"message":{"description":"Handwritten-styleThe message on the back","maxLength":600,"minLength":1,"type":"string"},"message_font":{"default":"handwriting","description":"Font for the message on the back","enum":["handwriting","serif","sans"],"type":"string"}},"required":["message"],"type":" ⟨29 unchanged words⟩ 2,}$","type":"string"},"express":{"default":false,"description":"Send by express (USPS Priority Mail, usually 2–3 days, with tracking) for an extra charge; see get_pricing. Not available with certified.","type":"boolean"},"from":{"description":"Return address; printed on ⟨111 unchanged words⟩ "maxLength":120,"type":"string"},"recipients":{"description":"Send the same piece to several people: 2-25 US addresses, used INSTEAD of to. Each gets their own order and tracking; one payment covers all.","items":{"properties":{"city":{"description":"City","maxLength":40,"minLength":2,"type":"string"},"company":{"description":"Company name, printed under the person's name","maxLength":60,"type":"string"},"line1":{"description":"Street address","maxLength":64,"minLength":3,"type":"string"},"line2":{"description":"Apartment, suite, unit","maxLength":64,"type":"string"},"name":{"description":"Recipient or sender full name","maxLength":60,"minLength":1,"type":"string"},"state":{"description":"Two-letter US state code, e.g. NY","type":"string"},"zip":{"description":"5-digit US ZIP code, or ZIP+4","pattern":"^\\d{5}(-\\d{4})?$","type":"string"}},"required":["name","line1","city","state","zip"],"type":"object"},"maxItems":25,"minItems":2,"type":"array"},"size":{"default":"4x6","description": ⟨16 unchanged words⟩ to":{"description":"Recipient's US mailing address (or use recipients for several people)","properties":{"city":{"description": ⟨84 unchanged words⟩ ,"type":"object"}},"required":["to","from","content"],"type":"object"}
{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":{},"properties":{"batch":{"additionalProperties":false,"description":"Present when the order was created with recipients: the whole group. The top-level fields describe the first recipient's order; use batch.price and batch.checkout_url for the total and payment.","properties":{"checkout_url":{"description":"One payment link for every unpaid order in the group","type":["string","null"]},"count":{"description":"How many recipients (one order each)","type":"number"},"discount":{"anyOf":[{"additionalProperties":false,"properties":{"amount_cents":{"type":"number"},"display":{"type":"string"},"reason":{"type":"string"}},"required":["amount_cents","display","reason"],"type":"object"},{"type":"null"}]},"id":{"type":"string"},"price":{"additionalProperties":false,"description":"Total for the whole group","properties":{"amount_cents":{"type":"number"},"currency":{"type":"string"},"display":{"type":"string"}},"required":["amount_cents","currency","display"],"type":"object"},"url":{"description":"Group page listing every recipient","type":"string"}},"required":["id","count","url","checkout_url","price","discount"],"type":"object"},"certified":{"description":"none, certified or ⟨65 unchanged words⟩ ":"Order status page","type":"string"},"orders":{"description":"Every order in the group, when created with recipients","items":{"additionalProperties":false,"properties":{"id":{"type":"string"},"order_url":{"type":"string"},"preview_url":{"type":"string"},"to":{"type":"string"}},"required":["id","to","order_url","preview_url"],"type":"object"},"type":"array"},"preview_url":{"description":"Exact print ⟨98 unchanged words⟩