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Set cart quantity

set_cart_item_quantity

DestructiveIdempotent

Set the exact quantity of a product in a Continente cart; add it if missing, remove it at zero, and use cartItemId to target a specific line.

Instructions

Make the cart hold exactly this quantity of a product, adding it if it is not there yet. Zero removes it. Pass cartItemId from get_cart when the product has more than one line. If the result has mutation.outcome "unknown", the cart may have changed: call get_cart before any further change and never repeat the request automatically.

Input Schema

TableJSON Schema

Name	Required	Description
`quantity`	Yes	Desired total in the product sale unit. Zero removes the item.
`productId`	Yes	productId from another tool, such as "00123". A product slug ending in that ID (for example "leite-00123") also works.
`cartItemId`	No	Cart line identifier from get_cart. Required to select one of several lines for the same product.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv0.6.0Oct 15, 2026

changedOutput schema / properties / result / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "additionalProperties": false,
-        "properties": {
-          "cartItemId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^[^\\s\\x00-\\x1f\\x7f]+$",
-            "type": "string"
-          },
-          "confirmedQuantity": {
-            "additionalProperties": false,
-            "properties": {
-              "unit": {
-                "enum": [
-                  "un",
-                  "kg",
-                  "g",
-                  "l",
-                  "ml"
-                ],
-                "type": "string"
-              },
-              "value": {
-                "minimum": 0,
-                "type": "number"
-              }
-            },
-            "required": [
-              "value",
-              "unit"
-            ],
-            "type": "object"
-          },
-          "disposition": {
-            "enum": [
-              "removed",
-              "already_absent"
-            ],
-            "type": "string"
-          },
-          "outcome": {
-            "const": "confirmed",
-            "type": "string"
-          },
-          "productId": {
-            "maxLength": 200,
-            "minLength": 1,
-            "pattern": "^\\d+$",
-            "type": "string"
-          },
-          "requested": {
-            "additionalProperties": false,
-            "properties": {
-              "unit": {
-                "enum": [
-                  "un",
-                  "kg",
-                  "g",
-                  "l",
-                  "ml"
-                ],
-                "type": "string"
-              },
-              "value": {
-                "minimum": 0,
-                "type": "number"
-              }
-            },
-            "required": [
-              "value",
-              "unit"
-            ],
-            "type": "object"
-          }
-        },
-        "required": [
-          "productId",
-          "requested",
-          "outcome",
-          "confirmedQuantity"
-        ],
-        "type": "object"
-      },
-      "status": {
-        "enum": [
-          "success",
-          "empty",
-          "partial"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "status",
-      "data"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "anyOf": [
-              {
-                "enum": [
-                  "invalid_data",
-                  "invalid_input",
-                  "not_authenticated",
-                  "upstream_unavailable",
-                  "not_found",
-                  "sale_rules_unknown",
-                  "quantity_below_minimum",
-                  "cart_change_rejected",
-                  "cart_change_unconfirmed",
-                  "cache_unavailable",
-                  "order_details_unavailable",
-                  "cancelled",
-                  "deadline_exceeded",
-                  "server_closed",
-                  "queue_full"
-                ],
-                "type": "string"
-              },
-              {
-                "enum": [
-                  "internal_error",
-                  "invalid_result"
-                ],
-                "type": "string"
-              }
-            ]
-          },
-          "issues": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "code": {
-                  "type": "string"
-                },
-                "path": {
-                  "type": "string"
-                }
-              },
-              "required": [
-                "path",
-                "code"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "message": {
-            "minLength": 1,
-            "type": "string"
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable"
-        ],
-        "type": "object"
-      },
-      "mutation": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "outcome": {
-                "const": "not_applied",
-                "type": "string"
-              }
-            },
-            "required": [
-              "outcome"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "outcome": {
-                "const": "unknown",
-                "type": "string"
-              },
-              "recovery": {
-                "additionalProperties": false,
-                "properties": {
-                  "action": {
-                    "const": "get_cart",
-                    "type": "string"
-                  },
-                  "automaticReplay": {
-                    "const": false,
-                    "type": "boolean"
-                  }
-                },
-                "required": [
-                  "action",
-                  "automaticReplay"
-                ],
-                "type": "object"
-              }
-            },
-            "required": [
-              "outcome",
-              "recovery"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "status": {
-        "const": "error",
-        "type": "string"
-      }
-    },
-    "required": [
-      "status",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "additionalProperties": false,
+        "properties": {
+          "cartItemId": {
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^[^\\s\\x00-\\x1f\\x7f]+$",
+            "type": "string"
+          },
+          "confirmedQuantity": {
+            "additionalProperties": false,
+            "properties": {
+              "unit": {
+                "enum": [
+                  "un",
+                  "kg",
+                  "g",
+                  "l",
+                  "ml"
+                ],
+                "type": "string"
+              },
+              "value": {
+                "minimum": 0,
+                "type": "number"
+              }
+            },
+            "required": [
+              "value",
+              "unit"
+            ],
+            "type": "object"
+          },
+          "disposition": {
+            "enum": [
+              "removed",
+              "already_absent"
+            ],
+            "type": "string"
+          },
+          "outcome": {
+            "const": "confirmed",
+            "type": "string"
+          },
+          "productId": {
+            "maxLength": 200,
+            "minLength": 1,
+            "pattern": "^\\d+$",
+            "type": "string"
+          },
+          "requested": {
+            "additionalProperties": false,
+            "properties": {
+              "unit": {
+                "enum": [
+                  "un",
+                  "kg",
+                  "g",
+                  "l",
+                  "ml"
+                ],
+                "type": "string"
+              },
+              "value": {
+                "minimum": 0,
+                "type": "number"
+              }
+            },
+            "required": [
+              "value",
+              "unit"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "productId",
+          "requested",
+          "outcome",
+          "confirmedQuantity"
+        ],
+        "type": "object"
+      },
+      "status": {
+        "enum": [
+          "success",
+          "empty",
+          "partial"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "status",
+      "data"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "anyOf": [
+              {
+                "enum": [
+                  "invalid_data",
+                  "invalid_input",
+                  "not_authenticated",
+                  "upstream_unavailable",
+                  "not_found",
+                  "sale_rules_unknown",
+                  "quantity_below_minimum",
+                  "cart_change_rejected",
+                  "cart_change_unconfirmed",
+                  "cache_unavailable",
+                  "order_details_unavailable",
+                  "cancelled",
+                  "deadline_exceeded",
+                  "server_closed",
+                  "queue_full",
+                  "browser_unavailable"
+                ],
+                "type": "string"
+              },
+              {
+                "enum": [
+                  "internal_error",
+                  "invalid_result"
+                ],
+                "type": "string"
+              }
+            ]
+          },
+          "issues": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "code": {
+                  "type": "string"
+                },
+                "path": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "path",
+                "code"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "message": {
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "mutation": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "outcome": {
+                "const": "not_applied",
+                "type": "string"
+              }
+            },
+            "required": [
+              "outcome"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "outcome": {
+                "const": "unknown",
+                "type": "string"
+              },
+              "recovery": {
+                "additionalProperties": false,
+                "properties": {
+                  "action": {
+                    "const": "get_cart",
+                    "type": "string"
+                  },
+                  "automaticReplay": {
+                    "const": false,
+                    "type": "boolean"
+                  }
+                },
+                "required": [
+                  "action",
+                  "automaticReplay"
+                ],
+                "type": "object"
+              }
+            },
+            "required": [
+              "outcome",
+              "recovery"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "status": {
+        "const": "error",
+        "type": "string"
+      }
+    },
+    "required": [
+      "status",
+      "error"
+    ],
+    "type": "object"
+  }
+]

First observedv0.2.0Oct 15, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations already declare destructive/idempotent/openWorld, and the description adds genuinely non-derivable context on top: that zero deletes the line, and a specific failure mode where mutation.outcome is 'unknown' leaves the cart in an unreliable state requiring a get_cart read before any further mutation. That retry-hazard warning is operational guidance no annotation conveys.

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 with zero waste, front-loaded with the core action, then the zero case and parameter selection, then the error-handling clause. No restatement of the name or 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?

With an output schema present and annotations covering the safety profile, the description supplies everything an agent needs to call it correctly: exact semantics, optional-parameter trigger, and the recovery path for an ambiguous mutation result.

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 coverage is 100%, so the baseline is 3, but the description goes further by explaining when cartItemId is actually needed (multiple lines for the same product) and reinforcing the zero-removes semantics of quantity. It does not add detail beyond what the schema already documents for productId.

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 ('Make the cart hold exactly this quantity of a product') and immediately clarifies the upsert behavior ('adding it if it is not there yet') and the zero-removes edge case. The 'exactly this quantity' phrasing behaviorally distinguishes it from add_cart_item/remove_cart_item without opening a 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 condition for the optional parameter ('Pass cartItemId from get_cart when the product has more than one line') and a recovery procedure for the 'unknown' outcome (call get_cart before further changes, never auto-repeat). It stops short of naming the sibling tools it supersedes for multi-line vs single-line cases, so it is clear but not fully routing.

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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