Custom Blinds Shop

update_cart

Destructive

Modify an open cart before checkout. op: 'add' appends items, 'remove' drops items by 0-based index, 'set' replaces the full item list, 'clear' empties the cart. Merges customer details (name, email, phone) via the customer field. Call get_cart afterwards to confirm. Cannot modify a cart that already has a checkout in progress.

Input Schema

Name	Required	Description	Default
`op`	No		set
`items`	No
`cart_id`	Yes
`indices`	No	Item indices to remove (0-based) when op='remove'
`customer`	No

Output Schema

Name	Required	Description	Default
`items`	Yes
`cart_id`	Yes
`currency`	Yes
`customer`	Yes
`total_zar`	Yes
`created_at`	Yes
`expires_at`	Yes
`item_count`	Yes
`updated_at`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedNov 2, 2026

removedInput schema / properties / cart_id / description
```
Removed value: -"cart_id returned by create_cart."
```

removedInput schema / properties / customer / description

Removed value: -"Customer details (name, email, phone, address, city) merged into the cart."

removedInput schema / properties / items / description

Removed value: -"Items for add or set. Each needs product_id, width_mm, height_mm, colour and mount_type."

addedInput schema / properties / items / items / properties / no_drill

Added value: +{
+  "description": "Optional. true for the no-drill option (tension brackets, inside the frame, max 2000mm wide; 1500mm on 25mm venetians). Adds the R65 no-drill kit per blind. Offered on indoor roller blinds, including value rollers, and 25mm aluminium or aluwood venetians. Dedicated no-drill products already include the kit.",
+  "type": "boolean"
+}

removedInput schema / properties / op / description

Removed value: -"add appends items, remove drops the items at the given indices, set replaces the whole item list, clear empties the cart. Default set."

Changed4 schema fields changedOct 28, 2026

addedInput schema / properties / cart_id / description
```
Added value: +"cart_id returned by create_cart."
```

addedInput schema / properties / customer / description

Added value: +"Customer details (name, email, phone, address, city) merged into the cart."

addedInput schema / properties / items / description

Added value: +"Items for add or set. Each needs product_id, width_mm, height_mm, colour and mount_type."

addedInput schema / properties / op / description

Added value: +"add appends items, remove drops the items at the given indices, set replaces the whole item list, clear empties the cart. Default set."

Changed4 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"
+  }
+}

addedInput schema / properties / items / items

Added value: +{
+  "properties": {
+    "colour": {
+      "description": "Exact available colour; validate with configure_product before adding",
+      "minLength": 1,
+      "type": "string"
+    },
+    "finish": {
+      "description": "Optional pricing finish for aluminium Venetians",
+      "type": "string"
+    },
+    "height_mm": {
+      "description": "Actual ordered drop in millimetres",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "mount_type": {
+      "description": "Use inside for recess fit or outside for face fix",
+      "minLength": 1,
+      "type": "string"
+    },
+    "product_id": {
+      "description": "product_id returned by search_catalog or lookup_catalog",
+      "type": "string"
+    },
+    "product_name": {
+      "description": "Optional; server resolves the catalogue name",
+      "type": "string"
+    },
+    "quantity": {
+      "description": "Number of blinds; defaults to 1",
+      "type": "number"
+    },
+    "total_price_zar": {
+      "description": "Optional, ignored: server recalculates all totals",
+      "type": "number"
+    },
+    "unit_price_zar": {
+      "description": "Optional, ignored: server recalculates all prices",
+      "type": "number"
+    },
+    "width_mm": {
+      "description": "Actual ordered width in millimetres",
+      "exclusiveMinimum": 0,
+      "type": "number"
+    }
+  },
+  "required": [
+    "product_id",
+    "width_mm",
+    "height_mm",
+    "colour",
+    "mount_type"
+  ],
+  "type": "object"
+}

addedInput schema / properties / op / default
```
Added value: +"set"
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "cart_id": {
+      "type": "string"
+    },
+    "created_at": {
+      "type": "string"
+    },
+    "currency": {
+      "const": "ZAR",
+      "type": "string"
+    },
+    "customer": {
+      "anyOf": [
+        {
+          "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"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "expires_at": {
+      "type": "string"
+    },
+    "item_count": {
+      "type": "number"
+    },
+    "items": {
+      "items": {
+        "additionalProperties": true,
+        "properties": {
+          "colour": {
+            "type": "string"
+          },
+          "finish": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "height_mm": {
+            "type": "number"
+          },
+          "mount_type": {
+            "type": "string"
+          },
+          "product_id": {
+            "type": "string"
+          },
+          "product_name": {
+            "type": "string"
+          },
+          "quantity": {
+            "type": "number"
+          },
+          "total_price_zar": {
+            "type": "number"
+          },
+          "unit_price_zar": {
+            "type": "number"
+          },
+          "width_mm": {
+            "type": "number"
+          }
+        },
+        "required": [
+          "product_id",
+          "width_mm",
+          "height_mm",
+          "quantity",
+          "unit_price_zar",
+          "total_price_zar"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "total_zar": {
+      "type": "number"
+    },
+    "updated_at": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "cart_id",
+    "items",
+    "item_count",
+    "total_zar",
+    "currency",
+    "customer",
+    "created_at",
+    "updated_at",
+    "expires_at"
+  ],
+  "type": "object"
+}

First observedMay 25, 2026

TDQS

A4.4/5.0

Behavior4/5

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

Annotations already flag this as destructive, but the description adds real value beyond them: the difference between 'set' (full replacement) and 'add'/'remove'/'clear', and the hard failure condition when a checkout is in progress. It does not mention that client-supplied prices are recalculated, but that detail lives in the schema.

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?

Front-loaded purpose followed by a compact op-by-op breakdown, one pre-call constraint and one post-call step. Every sentence carries distinct information with no repetition of the name or schema.

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?

Given an output schema and destructive annotations, the description covers what an agent needs: operation semantics, a blocking precondition and a verification step. Only the price-recalculation behavior is unaddressed at the description level, and that is documented in parameter schemas.

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?

Schema description coverage is low (20%), and the description compensates well: it assigns meaning to each op enum value, explains that 'remove' uses 0-based item indices (matching the indices param), and describes the customer merge fields. The items array itself is left to the rich nested schema.

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 ('Modify an open cart before checkout') and then defines each of the four operations, so an agent can distinguish it from create_cart, get_cart and update_checkout without opening the 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 an explicit follow-up step ('Call get_cart afterwards to confirm') and a clear exclusion ('Cannot modify a cart that already has a checkout in progress'). It stops short of naming the mutation siblings (update_checkout, cancel_cart) as alternatives, but the precondition and verification loop are actionable.

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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