Custom Blinds Shop

update_checkout

Destructive

Update customer details or payment_method only before payment-link generation. Paid, cancelled and payment-in-progress checkouts are rejected. Concurrent state changes are detected; retrieve the latest status before retrying.

Input Schema

Name	Required	Description
`customer`	No	Corrected customer details (name, email, phone, address, city).
`checkout_id`	Yes	checkout_id returned by create_checkout.
`payment_method`	No	yoco for card or ozow for instant EFT.

Output Schema

Name	Required	Description	Default
`ap2`	No
`items`	No
`status`	Yes
`message`	No
`currency`	Yes
`customer`	No
`next_step`	No
`total_zar`	Yes
`item_count`	No
`checkout_id`	Yes
`payment_url`	No
`payment_method`	No
`provider_reference`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 28, 2026
- addedInput schema / properties / checkout_id / description
```
Added value: +"checkout_id returned by create_checkout."
```
- addedInput schema / properties / customer / description
```
Added value: +"Corrected customer details (name, email, phone, address, city)."
```
- addedInput schema / properties / payment_method / description
```
Added value: +"yoco for card or ozow for instant EFT."
```

Changed3 schema fields changedOct 20, 2026

removedOutput schema / properties / created_at

Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ]
-}

changedOutput schema / properties / items / anyOf

Previous value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "properties": {
-        "colour": {
-          "type": "string"
-        },
-        "finish": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "height": {
-          "type": "number"
-        },
-        "mountType": {
-          "type": "string"
-        },
-        "price": {
-          "type": "number"
-        },
-        "productId": {
-          "type": "string"
-        },
-        "productName": {
-          "type": "string"
-        },
-        "quantity": {
-          "type": "number"
-        },
-        "total": {
-          "type": "number"
-        },
-        "width": {
-          "type": "number"
-        }
-      },
-      "required": [],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": true,
+      "properties": {
+        "colour": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "drop_mm": {
+          "type": "number"
+        },
+        "mount_type": {
+          "type": "string"
+        },
+        "product_name": {
+          "type": "string"
+        },
+        "product_slug": {
+          "type": "string"
+        },
+        "quantity": {
+          "type": "number"
+        },
+        "total_price": {
+          "type": "number"
+        },
+        "unit_price": {
+          "type": "number"
+        },
+        "width_mm": {
+          "type": "number"
+        }
+      },
+      "required": [],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / payment_status

Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ]
-}

Changed2 schema fields changedOct 10, 2026

addedInput schema / properties / customer / properties

Added value: +{
+  "address": {
+    "type": "string"
+  },
+  "city": {
+    "type": "string"
+  },
+  "email": {
+    "description": "Real customer email, checked before checkout creation",
+    "type": "string"
+  },
+  "name": {
+    "description": "Real customer name, checked before checkout creation",
+    "type": "string"
+  },
+  "phone": {
+    "description": "South African phone number, checked before checkout creation",
+    "type": "string"
+  }
+}

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "ap2": {
+      "additionalProperties": true,
+      "properties": {
+        "merchant_authorization": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "merchant_authorization"
+      ],
+      "type": "object"
+    },
+    "checkout_id": {
+      "type": "string"
+    },
+    "created_at": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "currency": {
+      "const": "ZAR",
+      "type": "string"
+    },
+    "customer": {
+      "additionalProperties": true,
+      "properties": {
+        "address": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "city": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "email": {
+          "type": "string"
+        },
+        "name": {
+          "type": "string"
+        },
+        "phone": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "required": [],
+      "type": "object"
+    },
+    "item_count": {
+      "type": "number"
+    },
+    "items": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "colour": {
+                "type": "string"
+              },
+              "finish": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "height": {
+                "type": "number"
+              },
+              "mountType": {
+                "type": "string"
+              },
+              "price": {
+                "type": "number"
+              },
+              "productId": {
+                "type": "string"
+              },
+              "productName": {
+                "type": "string"
+              },
+              "quantity": {
+                "type": "number"
+              },
+              "total": {
+                "type": "number"
+              },
+              "width": {
+                "type": "number"
+              }
+            },
+            "required": [],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "message": {
+      "type": "string"
+    },
+    "next_step": {
+      "type": "string"
+    },
+    "payment_method": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "payment_status": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "payment_url": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "provider_reference": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "status": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "total_zar": {
+      "type": "number"
+    }
+  },
+  "required": [
+    "checkout_id",
+    "status",
+    "total_zar",
+    "currency"
+  ],
+  "type": "object"
+}

First observedMay 28, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already flag destructiveHint=true, so the description's job is added context, which it supplies: which lifecycle states cause rejection and that concurrent state changes are detected, forcing a read-then-retry pattern. It does not describe what a successful update returns or whether prior customer data is overwritten, leaving a small gap.

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 short sentences, each load-bearing: scope/mutable fields first, rejection conditions second, concurrency/retry last. No restatement of the name and no filler.

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

Completeness4/5

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

With an output schema present, return values need no explanation, and the description covers the mutation precondition, rejection states, and concurrency failure mode. The only missing piece is failure semantics for validation errors (e.g. bad phone/email) beyond the schema's hints.

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

Parameters3/5

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

Schema coverage is 100% and the schema already documents checkout_id provenance, the yoco/ozow enum meaning, and per-field validation notes. The description adds no field-level meaning beyond what the schema provides, so baseline 3 applies.

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

Purpose4/5

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

States a specific verb ('Update') and the two mutable resources ('customer details or payment_method'), which tells an agent exactly what can change. The implicit contrast with update_cart is carried by the resource name rather than an explicit sentence, so it stops short of full sibling differentiation.

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 an explicit timing precondition ('only before payment-link generation') and enumerates the states that will be rejected (paid, cancelled, payment-in-progress). It also tells the agent to re-read status before retrying, though it does not name the sibling tool (get_checkout) to use for that read.

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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