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	Default
`customer`	No
`checkout_id`	Yes
`payment_method`	No

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 changedNov 2, 2026
- removedInput schema / properties / checkout_id / description
```
Removed value: -"checkout_id returned by create_checkout."
```
- removedInput schema / properties / customer / description
```
Removed value: -"Corrected customer details (name, email, phone, address, city)."
```
- removedInput schema / properties / payment_method / description
```
Removed value: -"yoco for card or ozow for instant EFT."
```
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 11, 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 25, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the write profile is known; the description adds genuinely non-structured behavior: state-based rejection rules, optimistic-concurrency detection, and a retry protocol. It does not cover permissions/auth requirements or whether omitted customer subfields are preserved or cleared.

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, zero filler, with the mutability constraint front-loaded and the retry guidance last. Every clause carries actionable information.

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?

An output schema exists, so return values need no explanation, and the description covers the two things an agent most needs for a gated mutation: which fields are editable and which states will fail. The remaining gap is partial-update semantics and permission prerequisites.

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 description coverage is 0% for the top-level parameters (checkout_id, payment_method, customer object), and the description only says 'customer details or payment_method' without clarifying which customer subfields are updatable or what yoco/ozow imply. It does confirm the two allowed update targets, which partially compensates, but leaves checkout_id format and enum meaning undocumented.

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 and resource (update checkout) plus the exact mutable surface: 'customer details or payment_method'. The lifecycle qualifier 'before payment-link generation' separates it from update_cart and from the checkout-creation siblings without naming them. Not a 5 because no sibling is named explicitly.

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 when ('only before payment-link generation') and an explicit when-not ('Paid, cancelled and payment-in-progress checkouts are rejected'), plus a retry procedure ('retrieve the latest status before retrying'). Missing an explicit pointer to the alternative tool (e.g. get_checkout, cancel_checkout) when the checkout is in a terminal state.

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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