Brainy Prices — UAE Cost of Living

dewa

Read-onlyIdempotent

DEWA electricity/water: tariff slabs, or bill estimate from kwh (+water, VAT, fee).

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "dewa"
  }
}

Input Schema

Name	Required	Description
`kwh`	No
`water_m3`	No
`water_gallons`	No	Imperial gallons.
`annual_rent_aed`	No

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed29 schema fields changedOct 30, 2026

addedOutput schema / $defs / DewaTariff / properties / dewa_consumption_charge_aed
```
Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
```
addedOutput schema / $defs / DewaTariff / properties / electricity / properties / fuel_surcharge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```
addedOutput schema / $defs / DewaTariff / properties / electricity / properties / meter_service_charge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```

addedOutput schema / $defs / DewaTariff / properties / electricity / properties / meter_service_charges / anyOf

Added value: +[
+  {
+    "items": {
+      "additionalProperties": false,
+      "properties": {
+        "amount_aed": {
+          "type": "number"
+        },
+        "meter_type": {
+          "type": [
+            "integer",
+            "null"
+          ]
+        }
+      },
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "$ref": "#/$defs/HousingFeePause"
+  }
+]

removedOutput schema / $defs / DewaTariff / properties / electricity / properties / meter_service_charges / items

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "amount_aed": {
-      "type": "number"
-    },
-    "meter_type": {
-      "type": "integer"
-    }
-  },
-  "required": [
-    "meter_type",
-    "amount_aed"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / DewaTariff / properties / electricity / properties / meter_service_charges / type
```
Removed value: -"array"
```
removedOutput schema / $defs / DewaTariff / properties / electricity / properties / slabs / items / required
```
Removed value: -[
-  "from",
-  "to",
-  "aed_per_unit"
-]
```

removedOutput schema / $defs / DewaTariff / properties / electricity / required

Removed value: -[
-  "unit",
-  "slabs",
-  "fuel_surcharge_aed_per_kwh",
-  "meter_service_charges"
-]

addedOutput schema / $defs / DewaTariff / properties / fuel_surcharge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```
addedOutput schema / $defs / DewaTariff / properties / housing_fee
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```
addedOutput schema / $defs / DewaTariff / properties / meter_service_charge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```
addedOutput schema / $defs / DewaTariff / properties / status
```
Added value: +{
+  "const": "partial"
+}
```
addedOutput schema / $defs / DewaTariff / properties / subtotal_aed
```
Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
```
addedOutput schema / $defs / DewaTariff / properties / subtotal_label
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / $defs / DewaTariff / properties / typical / items / properties / status
```
Added value: +{
+  "const": "not-available"
+}
```
addedOutput schema / $defs / DewaTariff / properties / typical / items / properties / subtotal_aed
```
Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
```
addedOutput schema / $defs / DewaTariff / properties / typical / items / properties / subtotal_label
```
Added value: +{
+  "type": "string"
+}
```
removedOutput schema / $defs / DewaTariff / properties / typical / items / required
```
Removed value: -[
-  "profile_id",
-  "kwh",
-  "m3",
-  "monthly_aed"
-]
```
addedOutput schema / $defs / DewaTariff / properties / water / properties / fuel_surcharge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```
addedOutput schema / $defs / DewaTariff / properties / water / properties / meter_service_charge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```

addedOutput schema / $defs / DewaTariff / properties / water / properties / meter_service_charges / anyOf

Added value: +[
+  {
+    "items": {
+      "additionalProperties": false,
+      "properties": {
+        "amount_aed": {
+          "type": "number"
+        },
+        "meter_type": {
+          "type": [
+            "integer",
+            "null"
+          ]
+        }
+      },
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "$ref": "#/$defs/HousingFeePause"
+  }
+]

removedOutput schema / $defs / DewaTariff / properties / water / properties / meter_service_charges / items

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "amount_aed": {
-      "type": "number"
-    },
-    "meter_type": {
-      "type": "integer"
-    }
-  },
-  "required": [
-    "meter_type",
-    "amount_aed"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / DewaTariff / properties / water / properties / meter_service_charges / type
```
Removed value: -"array"
```
removedOutput schema / $defs / DewaTariff / properties / water / properties / slabs / items / required
```
Removed value: -[
-  "from",
-  "to",
-  "aed_per_unit"
-]
```

removedOutput schema / $defs / DewaTariff / properties / water / required

Removed value: -[
-  "unit",
-  "slabs",
-  "fuel_surcharge_aed_per_m3",
-  "meter_service_charges"
-]

removedOutput schema / $defs / DewaTariff / required

Removed value: -[
-  "surcharge_month",
-  "vat_percent",
-  "electricity",
-  "water",
-  "housing_fee_rate_of_annual_rent",
-  "typical",
-  "not_included",
-  "provenance"
-]

addedOutput schema / $defs / HousingFeePause

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "notice": {
+      "type": "string"
+    },
+    "since": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "status": {
+      "const": "paused"
+    }
+  },
+  "required": [
+    "status",
+    "since",
+    "notice"
+  ],
+  "type": "object"
+}

removedOutput schema / $schema

Removed value: -"https://json-schema.org/draft/2020-12/schema"

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "anyOf": [
-          {
-            "$ref": "#/$defs/DewaTariff"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "links": {
-        "$ref": "#/$defs/Links"
-      },
-      "meta": {
-        "$ref": "#/$defs/ResponseMeta"
-      }
-    },
-    "required": [
-      "meta",
-      "data",
-      "links"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "annual_rent_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "electricity_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "electricity_fuel_surcharge_aed_per_kwh": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "housing_fee_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "housing_fee_percent": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "kwh": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "meter_service_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "months_per_year": {
-                "type": "integer"
-              },
-              "not_included": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "provenance": {
-                "$ref": "#/$defs/Provenance"
-              },
-              "subtotal_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "surcharge_month": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "tariff": {
-                "$ref": "#/$defs/DewaTariff"
-              },
-              "total_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "vat_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "water_aed": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "water_fuel_surcharge_aed_per_m3": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "water_gallons": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              "water_m3": {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "surcharge_month",
-              "electricity_fuel_surcharge_aed_per_kwh",
-              "water_fuel_surcharge_aed_per_m3",
-              "kwh",
-              "water_m3",
-              "electricity_aed",
-              "water_aed",
-              "meter_service_aed",
-              "subtotal_aed",
-              "vat_aed",
-              "housing_fee_aed",
-              "total_aed",
-              "not_included",
-              "provenance"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "links": {
-        "$ref": "#/$defs/Links"
-      },
-      "meta": {
-        "$ref": "#/$defs/ResponseMeta"
-      }
-    },
-    "required": [
-      "meta",
-      "data",
-      "links"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          },
-          "retry_after_s": {
-            "type": [
-              "integer",
-              "null"
-            ]
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable",
-          "retry_after_s"
-        ],
-        "type": "object"
-      },
-      "request_id": {
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "required": [
-      "error",
-      "request_id"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "anyOf": [
+          {
+            "$ref": "#/$defs/DewaTariff"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "links": {
+        "$ref": "#/$defs/Links"
+      },
+      "meta": {
+        "$ref": "#/$defs/ResponseMeta"
+      }
+    },
+    "required": [
+      "meta",
+      "data",
+      "links"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "annual_rent_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "dewa_consumption_charge_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "electricity_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "electricity_fuel_surcharge_aed_per_kwh": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "fuel_surcharge": {
+                "$ref": "#/$defs/HousingFeePause"
+              },
+              "housing_fee": {
+                "$ref": "#/$defs/HousingFeePause"
+              },
+              "housing_fee_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "housing_fee_percent": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "kwh": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "meter_service_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "meter_service_charge": {
+                "$ref": "#/$defs/HousingFeePause"
+              },
+              "months_per_year": {
+                "type": "integer"
+              },
+              "not_included": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "provenance": {
+                "$ref": "#/$defs/Provenance"
+              },
+              "status": {
+                "const": "partial"
+              },
+              "subtotal_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "subtotal_label": {
+                "type": "string"
+              },
+              "surcharge_month": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "tariff": {
+                "$ref": "#/$defs/DewaTariff"
+              },
+              "total_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "vat_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "vat_percent": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_fuel_surcharge_aed_per_m3": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_gallons": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_m3": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "links": {
+        "$ref": "#/$defs/Links"
+      },
+      "meta": {
+        "$ref": "#/$defs/ResponseMeta"
+      }
+    },
+    "required": [
+      "meta",
+      "data",
+      "links"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "retry_after_s": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable",
+          "retry_after_s"
+        ],
+        "type": "object"
+      },
+      "request_id": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "request_id"
+    ],
+    "type": "object"
+  }
+]

Changed1 schema field changedOct 13, 2026
- removedInput schema / $schema
```
Removed value: -"https://json-schema.org/draft/2020-12/schema"
```

Changed6 schema fields changedOct 6, 2026

removedOutput schema / $defs / DewaBillEstimate

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "annual_rent_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "electricity_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "electricity_fuel_surcharge_aed_per_kwh": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "housing_fee_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "housing_fee_percent": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "kwh": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "meter_service_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "months_per_year": {
-      "type": "integer"
-    },
-    "not_included": {
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "provenance": {
-      "$ref": "#/$defs/Provenance"
-    },
-    "subtotal_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "surcharge_month": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "tariff": {
-      "$ref": "#/$defs/DewaTariff"
-    },
-    "total_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "vat_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "water_aed": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "water_fuel_surcharge_aed_per_m3": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "water_gallons": {
-      "type": [
-        "number",
-        "null"
-      ]
-    },
-    "water_m3": {
-      "type": [
-        "number",
-        "null"
-      ]
-    }
-  },
-  "required": [
-    "surcharge_month",
-    "electricity_fuel_surcharge_aed_per_kwh",
-    "water_fuel_surcharge_aed_per_m3",
-    "kwh",
-    "water_m3",
-    "electricity_aed",
-    "water_aed",
-    "meter_service_aed",
-    "subtotal_aed",
-    "vat_aed",
-    "housing_fee_aed",
-    "total_aed",
-    "not_included",
-    "provenance"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / DewaBillEstimateResponse

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "data": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/DewaBillEstimate"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "links": {
-      "$ref": "#/$defs/Links"
-    },
-    "meta": {
-      "$ref": "#/$defs/ResponseMeta"
-    }
-  },
-  "required": [
-    "meta",
-    "data",
-    "links"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / DewaTariff / properties / typical / items / properties / profile_id / type
```
Removed value: -"string"
```

removedOutput schema / $defs / DewaTariffResponse

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "data": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/DewaTariff"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "links": {
-      "$ref": "#/$defs/Links"
-    },
-    "meta": {
-      "$ref": "#/$defs/ResponseMeta"
-    }
-  },
-  "required": [
-    "meta",
-    "data",
-    "links"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / ToolFailure

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "error": {
-      "additionalProperties": false,
-      "properties": {
-        "code": {
-          "type": "string"
-        },
-        "message": {
-          "type": "string"
-        },
-        "retry_after_s": {
-          "type": [
-            "integer",
-            "null"
-          ]
-        },
-        "retryable": {
-          "type": "boolean"
-        }
-      },
-      "required": [
-        "code",
-        "message",
-        "retryable",
-        "retry_after_s"
-      ],
-      "type": "object"
-    },
-    "request_id": {
-      "type": [
-        "string",
-        "null"
-      ]
-    }
-  },
-  "required": [
-    "error",
-    "request_id"
-  ],
-  "type": "object"
-}

changedOutput schema / anyOf

Previous value: -[
-  {
-    "$ref": "#/$defs/DewaTariffResponse"
-  },
-  {
-    "$ref": "#/$defs/DewaBillEstimateResponse"
-  },
-  {
-    "$ref": "#/$defs/ToolFailure"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "anyOf": [
+          {
+            "$ref": "#/$defs/DewaTariff"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "links": {
+        "$ref": "#/$defs/Links"
+      },
+      "meta": {
+        "$ref": "#/$defs/ResponseMeta"
+      }
+    },
+    "required": [
+      "meta",
+      "data",
+      "links"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "annual_rent_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "electricity_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "electricity_fuel_surcharge_aed_per_kwh": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "housing_fee_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "housing_fee_percent": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "kwh": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "meter_service_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "months_per_year": {
+                "type": "integer"
+              },
+              "not_included": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "provenance": {
+                "$ref": "#/$defs/Provenance"
+              },
+              "subtotal_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "surcharge_month": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "tariff": {
+                "$ref": "#/$defs/DewaTariff"
+              },
+              "total_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "vat_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_aed": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_fuel_surcharge_aed_per_m3": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_gallons": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "water_m3": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "surcharge_month",
+              "electricity_fuel_surcharge_aed_per_kwh",
+              "water_fuel_surcharge_aed_per_m3",
+              "kwh",
+              "water_m3",
+              "electricity_aed",
+              "water_aed",
+              "meter_service_aed",
+              "subtotal_aed",
+              "vat_aed",
+              "housing_fee_aed",
+              "total_aed",
+              "not_included",
+              "provenance"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "links": {
+        "$ref": "#/$defs/Links"
+      },
+      "meta": {
+        "$ref": "#/$defs/ResponseMeta"
+      }
+    },
+    "required": [
+      "meta",
+      "data",
+      "links"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "retry_after_s": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable",
+          "retry_after_s"
+        ],
+        "type": "object"
+      },
+      "request_id": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "request_id"
+    ],
+    "type": "object"
+  }
+]

AddedOct 4, 2026

TDQS

B3/5.0

Behavior3/5

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

Annotations already declare read-only, idempotent, non-destructive, and non-open-world behavior. The description adds that it computes tariff slabs or a bill estimate from kWh with water, VAT, and fee, but does not disclose calculation assumptions, optional-parameter behavior, or edge cases.

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?

A single compact sentence front-loads DEWA and the two calculation modes with no filler. Its brevity is efficient, though other dimensions capture the resulting under-specification.

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

Completeness2/5

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

For a 4-parameter calculator with only 25% schema coverage, the description omits annual_rent_aed's role, mode selection, and parameter interactions. The output schema covers return values and annotations cover safety, but the call setup remains under-explained.

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

Parameters2/5

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

It briefly names kwh and water and mentions VAT/fee, but leaves annual_rent_aed unexplained and does not clarify water_m3 versus water_gallons or how the two calculation modes are selected. With only 25% schema description coverage, this does not compensate for the missing parameter documentation.

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?

Names the specific resource (DEWA electricity/water) and two clear modes: tariff slabs or bill estimate from kWh. It does not explicitly differentiate itself from nearby cost calculators such as fixed_monthly_costs, so it falls short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies it is for DEWA tariff or bill calculations but gives no explicit when-to-use guidance, prerequisites, or alternatives among the many sibling cost tools.

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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