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get_cart

Read-onlyIdempotent

Read the current shopping cart, including line items, quantities, unit prices, line totals, and overall totals, so you can verify contents before making or confirming any changes.

Instructions

Read the shopping cart: each line with productId, cartItemId, kind (product or bag), quantity, unit price (per item or per kg) and lineTotal, plus the totals (products, bags, deposit, delivery, discounts and grandTotal, the amount to pay). Use it to check current quantities before changing them and to verify any uncertain change.

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

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": {
-          "customerAuthenticated": {
-            "type": "boolean"
-          },
-          "items": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "cartItemId": {
-                  "anyOf": [
-                    {
-                      "maxLength": 200,
-                      "minLength": 1,
-                      "pattern": "^[^\\s\\x00-\\x1f\\x7f]+$",
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "name": {
-                  "minLength": 1,
-                  "type": "string"
-                },
-                "price": {
-                  "additionalProperties": false,
-                  "properties": {
-                    "amount": {
-                      "anyOf": [
-                        {
-                          "additionalProperties": false,
-                          "properties": {
-                            "currency": {
-                              "const": "EUR",
-                              "type": "string"
-                            },
-                            "minorUnits": {
-                              "maximum": 9007199254740991,
-                              "minimum": 0,
-                              "type": "integer"
-                            }
-                          },
-                          "required": [
-                            "currency",
-                            "minorUnits"
-                          ],
-                          "type": "object"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ]
-                    },
-                    "basis": {
-                      "enum": [
-                        "unit",
-                        "line",
-                        "unknown"
-                      ],
-                      "type": "string"
-                    }
-                  },
-                  "required": [
-                    "amount",
-                    "basis"
-                  ],
-                  "type": "object"
-                },
-                "productId": {
-                  "maxLength": 200,
-                  "minLength": 1,
-                  "pattern": "^\\d+$",
-                  "type": "string"
-                },
-                "quantity": {
-                  "oneOf": [
-                    {
-                      "additionalProperties": false,
-                      "properties": {
-                        "quantity": {
-                          "additionalProperties": false,
-                          "properties": {
-                            "unit": {
-                              "enum": [
-                                "un",
-                                "kg",
-                                "g",
-                                "l",
-                                "ml"
-                              ],
-                              "type": "string"
-                            },
-                            "value": {
-                              "minimum": 0,
-                              "type": "number"
-                            }
-                          },
-                          "required": [
-                            "value",
-                            "unit"
-                          ],
-                          "type": "object"
-                        },
-                        "status": {
-                          "const": "known",
-                          "type": "string"
-                        }
-                      },
-                      "required": [
-                        "status",
-                        "quantity"
-                      ],
-                      "type": "object"
-                    },
-                    {
-                      "additionalProperties": false,
-                      "properties": {
-                        "rawText": {
-                          "type": [
-                            "string",
-                            "null"
-                          ]
-                        },
-                        "reason": {
-                          "enum": [
-                            "missing",
-                            "unsupported_unit",
-                            "unrecognized_format",
-                            "invalid_value"
-                          ],
-                          "type": "string"
-                        },
-                        "status": {
-                          "const": "unknown",
-                          "type": "string"
-                        },
-                        "value": {
-                          "anyOf": [
-                            {
-                              "minimum": 0,
-                              "type": "number"
-                            },
-                            {
-                              "type": "null"
-                            }
-                          ]
-                        }
-                      },
-                      "required": [
-                        "status",
-                        "value",
-                        "rawText"
-                      ],
-                      "type": "object"
-                    }
-                  ]
-                }
-              },
-              "required": [
-                "productId",
-                "cartItemId",
-                "name",
-                "quantity",
-                "price"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "total": {
-            "anyOf": [
-              {
-                "additionalProperties": false,
-                "properties": {
-                  "currency": {
-                    "const": "EUR",
-                    "type": "string"
-                  },
-                  "minorUnits": {
-                    "maximum": 9007199254740991,
-                    "minimum": 0,
-                    "type": "integer"
-                  }
-                },
-                "required": [
-                  "currency",
-                  "minorUnits"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "customerAuthenticated",
-          "items",
-          "total"
-        ],
-        "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": {
+          "customerAuthenticated": {
+            "type": "boolean"
+          },
+          "items": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "cartItemId": {
+                  "anyOf": [
+                    {
+                      "maxLength": 200,
+                      "minLength": 1,
+                      "pattern": "^[^\\s\\x00-\\x1f\\x7f]+$",
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "kind": {
+                  "enum": [
+                    "product",
+                    "bag"
+                  ],
+                  "type": "string"
+                },
+                "lineTotal": {
+                  "anyOf": [
+                    {
+                      "additionalProperties": false,
+                      "properties": {
+                        "currency": {
+                          "const": "EUR",
+                          "type": "string"
+                        },
+                        "minorUnits": {
+                          "maximum": 9007199254740991,
+                          "minimum": 0,
+                          "type": "integer"
+                        }
+                      },
+                      "required": [
+                        "currency",
+                        "minorUnits"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "name": {
+                  "minLength": 1,
+                  "type": "string"
+                },
+                "price": {
+                  "anyOf": [
+                    {
+                      "additionalProperties": false,
+                      "properties": {
+                        "amount": {
+                          "additionalProperties": false,
+                          "properties": {
+                            "currency": {
+                              "const": "EUR",
+                              "type": "string"
+                            },
+                            "minorUnits": {
+                              "maximum": 9007199254740991,
+                              "minimum": 0,
+                              "type": "integer"
+                            }
+                          },
+                          "required": [
+                            "currency",
+                            "minorUnits"
+                          ],
+                          "type": "object"
+                        },
+                        "per": {
+                          "enum": [
+                            "item",
+                            "piece",
+                            "kg",
+                            "l"
+                          ],
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "amount",
+                        "per"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "productId": {
+                  "maxLength": 200,
+                  "minLength": 1,
+                  "pattern": "^\\d+$",
+                  "type": "string"
+                },
+                "quantity": {
+                  "oneOf": [
+                    {
+                      "additionalProperties": false,
+                      "properties": {
+                        "quantity": {
+                          "additionalProperties": false,
+                          "properties": {
+                            "unit": {
+                              "enum": [
+                                "un",
+                                "kg",
+                                "g",
+                                "l",
+                                "ml"
+                              ],
+                              "type": "string"
+                            },
+                            "value": {
+                              "minimum": 0,
+                              "type": "number"
+                            }
+                          },
+                          "required": [
+                            "value",
+                            "unit"
+                          ],
+                          "type": "object"
+                        },
+                        "status": {
+                          "const": "known",
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "status",
+                        "quantity"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "additionalProperties": false,
+                      "properties": {
+                        "rawText": {
+                          "type": [
+                            "string",
+                            "null"
+                          ]
+                        },
+                        "reason": {
+                          "enum": [
+                            "missing",
+                            "unsupported_unit",
+                            "unrecognized_format",
+                            "invalid_value"
+                          ],
+                          "type": "string"
+                        },
+                        "status": {
+                          "const": "unknown",
+                          "type": "string"
+                        },
+                        "value": {
+                          "anyOf": [
+                            {
+                              "minimum": 0,
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        }
+                      },
+                      "required": [
+                        "status",
+                        "value",
+                        "rawText"
+                      ],
+                      "type": "object"
+                    }
+                  ]
+                }
+              },
+              "required": [
+                "productId",
+                "cartItemId",
+                "name",
+                "kind",
+                "quantity",
+                "price",
+                "lineTotal"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "totals": {
+            "additionalProperties": false,
+            "properties": {
+              "bags": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "currency": {
+                        "const": "EUR",
+                        "type": "string"
+                      },
+                      "minorUnits": {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currency",
+                      "minorUnits"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "delivery": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "currency": {
+                        "const": "EUR",
+                        "type": "string"
+                      },
+                      "minorUnits": {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currency",
+                      "minorUnits"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "deposit": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "currency": {
+                        "const": "EUR",
+                        "type": "string"
+                      },
+                      "minorUnits": {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currency",
+                      "minorUnits"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "discounts": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "currency": {
+                        "const": "EUR",
+                        "type": "string"
+                      },
+                      "minorUnits": {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currency",
+                      "minorUnits"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "grandTotal": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "currency": {
+                        "const": "EUR",
+                        "type": "string"
+                      },
+                      "minorUnits": {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currency",
+                      "minorUnits"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "products": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "currency": {
+                        "const": "EUR",
+                        "type": "string"
+                      },
+                      "minorUnits": {
+                        "maximum": 9007199254740991,
+                        "minimum": 0,
+                        "type": "integer"
+                      }
+                    },
+                    "required": [
+                      "currency",
+                      "minorUnits"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "products",
+              "bags",
+              "deposit",
+              "delivery",
+              "discounts",
+              "grandTotal"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "customerAuthenticated",
+          "items",
+          "totals"
+        ],
+        "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

A4.2/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is fully covered by structured data. The description adds little behavioral detail beyond what annotations and the output schema provide; its main extra is workflow context (verify before/after changes), which is useful but not a new behavioral trait.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is front-loaded with the core purpose and is only two sentences. However, the long enumeration of return fields is partly redundant with the existing output schema, so not every clause fully earns its place.

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?

For a simple, zero-parameter read tool with rich annotations and an output schema, the description covers what is returned and when to call it. Nothing an agent needs to invoke it correctly is missing.

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?

The tool has zero parameters, so the baseline is 4. The description correctly adds no parameter syntax or constraints, and there are no parameters for it to compensate for.

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?

The description states a precise verb ('Read') and resource ('the shopping cart'), then enumerates exactly what the read returns (line items and totals). This clearly distinguishes it from mutation siblings like add_cart_item, set_cart_item_quantity, and remove_cart_item without needing to name them.

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?

It gives explicit when-to-use guidance: 'to check current quantities before changing them' and 'to verify any uncertain change.' That directly points to the mutation siblings and the workflow context. It does not name alternatives explicitly or state when-not-to-use, so a 4 rather than a 5.

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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