Sendpaper

Pay for an order

pay_order

DestructiveIdempotent

Pay for an unpaid order with a Stripe shared payment token (spt_…) the user approved, scoped 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 to print. Use only after the user approved the purchase.

Input Schema

Name	Required	Description	Default
`order_id`	Yes	Order id from create_postcard or create_letter, ord_…
`shared_payment_token`	Yes	Stripe shared payment token, spt_…

Output Schema

Name	Required	Description
`id`	Yes	Order id, ord_…
`batch`	No	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.
`price`	Yes
`object`	Yes
`orders`	No	Every order in the group, when created with recipients
`status`	Yes	awaiting_payment, paid, printing, mailed, cancelled or refunded
`product`	Yes	Product id, e.g. postcard_4x6 or letter_certified
`discount`	Yes	First-order discount, already taken off price; null when none applies
`tracking`	Yes	USPS tracking, for Certified Mail once printed
`certified`	Yes	none, certified or certified_return_receipt
`order_url`	Yes	Order status page
`preview_url`	Yes	Exact print preview
`checkout_url`	Yes	Where the user pays; null once paid or cancelled
`product_name`	Yes
`status_detail`	Yes	Plain-English status to show the user
`preview_image_url`	No	PNG picture of the piece (postcard front and back, or the letter's first page) to show the user

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 13, 2026

addedOutput schema / properties / preview_image_url

Added value: +{
+  "description": "PNG picture of the piece (postcard front and back, or the letter's first page) to show the user",
+  "type": "string"
+}

Changed2 schema fields changedOct 8, 2026

addedOutput schema / properties / batch

Added value: +{
+  "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"
+}

addedOutput schema / properties / orders

Added value: +{
+  "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"
+}

Changed3 schema fields changedOct 5, 2026

addedOutput schema / properties / discount

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "amount_cents": {
+          "type": "number"
+        },
+        "display": {
+          "type": "string"
+        },
+        "reason": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "amount_cents",
+        "display",
+        "reason"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "First-order discount, already taken off price; null when none applies"
+}

removedOutput schema / properties / first_postcard_free

Removed value: -{
-  "additionalProperties": false,
-  "description": "Present when the first-postcard-free offer applies",
-  "properties": {
-    "applied": {
-      "type": "boolean"
-    },
-    "eligible": {
-      "type": "boolean"
-    },
-    "how": {
-      "type": "string"
-    }
-  },
-  "type": "object"
-}

changedOutput schema / required

Previous value: -[
-  "id",
-  "object",
-  "product",
-  "product_name",
-  "certified",
-  "status",
-  "status_detail",
-  "price",
-  "checkout_url",
-  "order_url",
-  "preview_url",
-  "tracking"
-]New value: +[
+  "id",
+  "object",
+  "product",
+  "product_name",
+  "certified",
+  "status",
+  "status_detail",
+  "price",
+  "checkout_url",
+  "order_url",
+  "preview_url",
+  "tracking",
+  "discount"
+]

Changed2 schema fields changedOct 5, 2026

addedInput schema / properties / order_id / description

Added value: +"Order id from create_postcard or create_letter, ord_…"

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "certified": {
+      "description": "none, certified or certified_return_receipt",
+      "type": "string"
+    },
+    "checkout_url": {
+      "description": "Where the user pays; null once paid or cancelled",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "first_postcard_free": {
+      "additionalProperties": false,
+      "description": "Present when the first-postcard-free offer applies",
+      "properties": {
+        "applied": {
+          "type": "boolean"
+        },
+        "eligible": {
+          "type": "boolean"
+        },
+        "how": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "id": {
+      "description": "Order id, ord_…",
+      "type": "string"
+    },
+    "object": {
+      "enum": [
+        "postcard",
+        "letter"
+      ],
+      "type": "string"
+    },
+    "order_url": {
+      "description": "Order status page",
+      "type": "string"
+    },
+    "preview_url": {
+      "description": "Exact print preview",
+      "type": "string"
+    },
+    "price": {
+      "additionalProperties": false,
+      "properties": {
+        "amount_cents": {
+          "type": "number"
+        },
+        "currency": {
+          "type": "string"
+        },
+        "display": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "amount_cents",
+        "currency",
+        "display"
+      ],
+      "type": "object"
+    },
+    "product": {
+      "description": "Product id, e.g. postcard_4x6 or letter_certified",
+      "type": "string"
+    },
+    "product_name": {
+      "type": "string"
+    },
+    "status": {
+      "description": "awaiting_payment, paid, printing, mailed, cancelled or refunded",
+      "type": "string"
+    },
+    "status_detail": {
+      "description": "Plain-English status to show the user",
+      "type": "string"
+    },
+    "tracking": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "number": {
+              "type": "string"
+            },
+            "url": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "number",
+            "url"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "USPS tracking, for Certified Mail once printed"
+    }
+  },
+  "required": [
+    "id",
+    "object",
+    "product",
+    "product_name",
+    "certified",
+    "status",
+    "status_detail",
+    "price",
+    "checkout_url",
+    "order_url",
+    "preview_url",
+    "tracking"
+  ],
+  "type": "object"
+}

First observedOct 3, 2026

TDQS

A4.5/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already flag destructiveHint=true, idempotentHint=true, and openWorldHint=true, so the safety profile is covered. The description adds genuine context beyond them: the token must be scoped to at least the order amount in USD (batch.price for groups), and on success the order is paid and 'goes to print' – a side effect the annotations do not convey.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three tight sentences, front-loaded with the core action and its required credential, followed by the group-payment edge case and the approval precondition. No filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values need not be described. The description covers the mutation's precondition, the credential scoping rules, the batch case, and the success side effect (order goes to print) – everything an agent needs to invoke it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 100% schema coverage, both parameters are already documented, so the baseline is 3. The description adds real meaning beyond the schema: the token must be scoped to at least the order amount in USD and, for recipient orders, to batch.price – constraints that matter for correct invocation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Pay for an unpaid order') and immediately identifies the required payment artifact (Stripe shared payment token). An agent can distinguish this from create_postcard/create_letter (creates orders) and cancel_order without opening any schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives a clear precondition ('Use only after the user approved the purchase') and clarifies behavior for a specific case (orders created with recipients pay the whole group at once). It does not explicitly name sibling alternatives or when-not to use, but the context is unambiguous.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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