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• Added readOnlyHint: false, destructiveHint: false, idempotentHint: false (inferred from the name). (verify)

{
  "name": "create_sandbox_key",
  "description": "Get a temporary sandbox credential for this demo store, valid 24h. Present it as an `Authorization: Bearer` header, or — when your client cannot set headers — as the `agent_key` argument of the checkout tools. Payments here are simulated: this credential settles nothing and works only on the demo store. No human login is involved at any point.",
  "inputSchema": {
    "type": "object",
    "$schema": "http://json-schema.org/draft-07/schema#",
    "properties": {},
    "additionalProperties": true
  },
  "annotations": {
    "readOnlyHint": false,
    "destructiveHint": false,
    "idempotentHint": false
  }
}

• Added "type":"string" to untyped parameters: meta, x402_payload. Change to number/boolean/array where that's what you accept. (verify)

{
  "name": "ucp_complete_checkout",
  "description": "Complete a UCP checkout session. Transitions to 'completed' status. Idempotent — safe to retry with the same idempotency_key. Use ONLY for a checkout session created with ucp_create_checkout (Universal Commerce Protocol); for the standard flow (create_cart, preview_checkout, complete_checkout) do not call this tool. For a cart built with create_cart use complete_checkout. PAYMENT MANDATE: this tool also requires one, issued by the platform, not written by you. Call `preview_checkout` for this ca",
  "inputSchema": {
    "type": "object",
    "$schema": "http://json-schema.org/draft-07/schema#",
    "required": [
      "checkout_id",
      "idempotency_key"
    ],
    "properties": {
      "ap2": {
        "type": "object",
        "required": [
          "checkout_mandate"
        ],
        "properties": {
          "checkout_mandate": {
            "type": "string",
            "pattern": "^[A-Za-z0-9_.~-]+$",
            "maxLength": 262144,
            "minLength": 1,
            "description": "AP2 Checkout Mandate (SD-JWT chain) the user signed over the exact checkout returned by the last ucp_get_checkout."
          }
        },
        "description": "AP2 mandates extension. Required when the checkout carries ap2.merchant_authorization.",
        "additionalProperties": true
      },
      "meta": {
        "description": "UCP request metadata. meta['ucp-agent'].profile = URL of the platform profile; it must be an https URL without credentials (at most 2048 characters).",
        "type": "string"
      },
      "buyer": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "Buyer full name"
          },
          "email": {
            "type": "string",
            "format": "email",
            "description": "Buyer email address"
          },
          "phone": {
            "type": "string",
            "description": "Buyer phone number"
          }
        },
        "description": "Buyer name and email, needed to request the approval link.",
        "additionalProperties": true
      },
      "payment": {
        "type": "object",
        "properties": {
          "instruments": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "credential": {
                  "type": "object",
                  "properties": {
                    "token": {
                      "type": "string",
                      "maxLength": 262144,
                      "description": "AP2 Payment Mandate (SD-JWT chain)."
                    }
                  },
                  "additionalProperties": true
                }
              },
              "additionalProperties": true
            },
            "maxItems": 16
          }
        },
        "description": "UCP payment. With AP2, the Payment Mandate goes in instruments[].credential.token.",
        "additionalProperties": true
      },
      "agent_key": {
        "type": "string",
        "description": "Sandbox credential from `create_sandbox_key`. Use this when your client cannot set an `Authorization: Bearer` header."
      },
      "checkout_id": {
        "type": "string",
        "description": "UCP checkout session ID (valid UUID)"
      },
      "x402_payload": {
        "description": "x402: signed payment for the server offer (omit to get it).",
        "type": "string"
      },
      "payment_option": {
        "enum": [
          "demo_card",
          "demo_wallet",
          "own_wallet",
          "merchant_card",
          "paypal"
        ],
        "type": "string",
        "description": "Payment method THE PERSON chose, when preview_checkout returned payment_options. Ask the person; never choose for them. Card numbers and wallet keys are never sent here: the person approves (and, with own_wallet, signs) on the approval page."
      },
      "idempotency_key": {
        "type": "string",
        "pattern": "^[A-Za-z0-9._:/-]{1,128}$",
        "maxLength": 128,
        "description": "REQUIRED as an argument in this tool: the `Idempotency-Key` header or `_meta` alone is not enough. 1-128 chars from [A-Za-z0-9._:/-]. Reuse the same value when retrying the same operation."
      },
      "payment_handler": {
        "enum": [
          "stripe",
          "x402"
        ],
        "type": "string",
        "description": "Payment handler the store profile publishes. Omit for default."
      },
      "payment_mandate": {
        "anyOf": [
          {
            "type": "object",
            "additionalProperties": {}
          },
          {
            "type": "string"
          }
        ],
        "description": "Payment mandate issued by the platform for this cart: the compact JWS you receive after the approval opened by `preview_checkout` is granted (its `exp` is Unix seconds and `aud` is this store's slug). Forward it as received; a mandate you write yourself is not accepted here. The approval is bound to your agent credential and does not verify that a person was present. Use this when your client cannot set an `X-Payment-Mandate` header."
      },
      "shared_payment_token": {
        "type": "string",
        "pattern": "^spt_[A-Za-z0-9_]+$",
        "description": "Stripe Shared Payment Token (spt_…) granted by the buyer's agent wallet for payment_method=ACP. Issued by Stripe, scoped to this merchant, amount and currency, and consumed when used: it can be charged once. Only honoured when this deployment enables native ACP settlement."
      }
    },
    "additionalProperties": true
  },
  "annotations": {
    "readOnlyHint": false,
    "openWorldHint": false,
    "idempotentHint": true,
    "destructiveHint": false
  }
}

• Added "type":"string" to untyped parameters: meta. Change to number/boolean/array where that's what you accept. (verify)

{
  "name": "ucp_create_checkout",
  "description": "Create a UCP (Universal Commerce Protocol) checkout session from line items. Returns a UCP checkout object with status 'incomplete'. Starts the UCP flow (ucp_* tools); for the standard flow use create_cart instead. Do not mix the two flows on the same purchase. Checkout guide: read the MCP resource trusteed://guides/checkout.",
  "inputSchema": {
    "type": "object",
    "$schema": "http://json-schema.org/draft-07/schema#",
    "required": [
      "currency",
      "line_items"
    ],
    "properties": {
      "meta": {
        "description": "UCP request metadata. meta['ucp-agent'].profile = URL of the platform profile; it must be an https URL without credentials (at most 2048 characters).",
        "type": "string"
      },
      "label": {
        "type": "string",
        "description": "Optional label for additional identifiers (e.g. external order ref, multi-PSP reference)"
      },
      "intent": {
        "type": "object",
        "required": [
          "action"
        ],
        "properties": {
          "action": {
            "type": "string",
            "description": "Intent action (e.g. 'purchase', 'gift', 'compare')"
          },
          "locale": {
            "type": "string",
            "description": "ISO locale"
          },
          "context": {
            "type": "string",
            "description": "Natural language context for personalization"
          }
        },
        "description": "Intent context for relevance and personalization",
        "additionalProperties": true
      },
      "currency": {
        "type": "string",
        "maxLength": 3,
        "minLength": 3,
        "description": "ISO 4217 currency code (e.g. USD)"
      },
      "agent_key": {
        "type": "string",
        "description": "Sandbox credential from `create_sandbox_key`. Use this when your client cannot set an `Authorization: Bearer` header."
      },
      "line_items": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "product_id",
            "title",
            "quantity",
            "price"
          ],
          "properties": {
            "price": {
              "type": "object",
              "required": [
                "amount",
                "currency"
              ],
              "properties": {
                "amount": {
                  "type": "number",
                  "minimum": 0,
                  "description": "Ignored: the catalogue price is used and returned per line. Any non-negative integer is accepted."
                },
                "currency": {
                  "type": "string",
                  "maxLength": 3,
                  "minLength": 3,
                  "description": "ISO 4217 currency code"
                }
              },
              "additionalProperties": false
            },
            "title": {
              "type": "string",
              "minLength": 1,
              "description": "Ignored: the catalogue title is used. Any non-empty string is accepted."
            },
            "quantity": {
              "type": "integer",
              "description": "Quantity",
              "exclusiveMinimum": 0
            },
            "product_id": {
              "type": "string",
              "minLength": 1,
              "description": "Product identifier"
            },
            "variant_id": {
              "type": "string",
              "minLength": 1,
              "description": "Variant (size/colour) id as listed by get_product_details. Required when the product has more than one variant; the price and stock of THAT variant apply."
            }
          },
          "additionalProperties": true
        },
        "minItems": 1,
        "description": "Line items for the checkout"
      },
      "idempotency_key": {
        "type": "string",
        "pattern": "^[A-Za-z0-9._:/-]{1,128}$",
        "maxLength": 128,
        "description": "REQUIRED for this write unless sent as the `Idempotency-Key` header or `params._meta[\"trusteed/idempotency-key\"]`. 1-128 chars from [A-Za-z0-9._:/-]. Reuse the same value when retrying the same operation."
      }
    },
    "additionalProperties": true
  },
  "annotations": {
    "readOnlyHint": false,
    "openWorldHint": false,
    "idempotentHint": true,
    "destructiveHint": false
  }
}