Brainy Prices — UAE Cost of Living

costs_by_emirate

Read-onlyIdempotent

Compare emirates: rent, utilities, schools. Non-Dubai rent unknown.

Input Schema

Name	Required	Description	Default
`cursor`	No
`page_size`	No
`emirate_id`	No

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed26 schema fields changedOct 30, 2026

changedOutput schema / $defs / EmirateCostContext / required

Previous value: -[
-  "consumption",
-  "hubs",
-  "paused_tolls",
-  "notes"
-]New value: +[
+  "consumption",
+  "hubs",
+  "notes"
+]

removedOutput schema / $defs / EmirateCosts / properties / areas / items / properties / nearest_airport / required
```
Removed value: -[
-  "code",
-  "name",
-  "km"
-]
```
removedOutput schema / $defs / EmirateCosts / properties / areas / items / required
```
Removed value: -[
-  "area_id",
-  "name",
-  "point",
-  "nearest_airport"
-]
```
addedOutput schema / $defs / EmirateCosts / properties / dewa_consumption_charge_aed
```
Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
```
addedOutput schema / $defs / EmirateCosts / properties / fuel_surcharge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```
removedOutput schema / $defs / EmirateCosts / properties / housing_fee / additionalProperties
```
Removed value: -false
```

addedOutput schema / $defs / EmirateCosts / properties / housing_fee / anyOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "how": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "min_aed": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "percent_of_annual_rent": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "source_url": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "status": {
+        "enum": [
+          "ok",
+          "partial",
+          "no_official_data_found"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "$ref": "#/$defs/HousingFeePause"
+  }
+]

removedOutput schema / $defs / EmirateCosts / properties / housing_fee / properties

Removed value: -{
-  "how": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "min_aed": {
-    "type": [
-      "number",
-      "null"
-    ]
-  },
-  "percent_of_annual_rent": {
-    "type": [
-      "number",
-      "null"
-    ]
-  },
-  "source_url": {
-    "anyOf": [
-      {
-        "type": "string"
-      },
-      {
-        "type": "null"
-      }
-    ]
-  },
-  "status": {
-    "enum": [
-      "ok",
-      "partial",
-      "no_official_data_found"
-    ]
-  }
-}

removedOutput schema / $defs / EmirateCosts / properties / housing_fee / required

Removed value: -[
-  "status",
-  "percent_of_annual_rent",
-  "min_aed",
-  "how",
-  "source_url"
-]

removedOutput schema / $defs / EmirateCosts / properties / housing_fee / type
```
Removed value: -"object"
```

removedOutput schema / $defs / EmirateCosts / properties / intercity_buses / items / required

Removed value: -[
-  "route",
-  "from",
-  "to_dubai_station",
-  "fare_one_way_aed",
-  "minutes",
-  "frequency",
-  "source_url"
-]

addedOutput schema / $defs / EmirateCosts / properties / meter_service_charge
```
Added value: +{
+  "$ref": "#/$defs/HousingFeePause"
+}
```

removedOutput schema / $defs / EmirateCosts / properties / rent / properties / medians / items / required

Removed value: -[
-  "area",
-  "property_type",
-  "bedrooms",
-  "median_monthly_aed",
-  "median_annual_aed",
-  "p25_annual_aed",
-  "p75_annual_aed",
-  "contracts"
-]

changedOutput schema / $defs / EmirateCosts / properties / rent / properties / status / enum

Previous value: -[
-  "ok",
-  "no_comparable_open_data",
-  "no_official_data_found"
-]New value: +[
+  "ok",
+  "no_comparable_open_data",
+  "no_official_data_found",
+  "not_published"
+]

removedOutput schema / $defs / EmirateCosts / properties / rent / required

Removed value: -[
-  "status",
-  "note",
-  "period",
-  "attribution",
-  "medians",
-  "source_urls"
-]

removedOutput schema / $defs / EmirateCosts / properties / schools / required
```
Removed value: -[
-  "status",
-  "note"
-]
```
addedOutput schema / $defs / EmirateCosts / properties / status
```
Added value: +{
+  "const": "partial"
+}
```
addedOutput schema / $defs / EmirateCosts / properties / subtotal_label
```
Added value: +{
+  "type": "string"
+}
```
removedOutput schema / $defs / EmirateCosts / properties / utilities / additionalProperties
```
Removed value: -false
```

addedOutput schema / $defs / EmirateCosts / properties / utilities / anyOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "basis": {
+        "type": "string"
+      },
+      "calculated": {
+        "type": "boolean"
+      },
+      "electricity_aed": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "missing": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "monthly_aed": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "provider": {
+        "type": "string"
+      },
+      "source_urls": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "vat_note": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "water_aed": {
+        "type": [
+          "number",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "$ref": "#/$defs/HousingFeePause"
+  }
+]

removedOutput schema / $defs / EmirateCosts / properties / utilities / properties

Removed value: -{
-  "basis": {
-    "type": "string"
-  },
-  "calculated": {
-    "type": "boolean"
-  },
-  "electricity_aed": {
-    "type": [
-      "number",
-      "null"
-    ]
-  },
-  "missing": {
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  },
-  "monthly_aed": {
-    "type": [
-      "number",
-      "null"
-    ]
-  },
-  "provider": {
-    "type": "string"
-  },
-  "source_urls": {
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  },
-  "vat_note": {
-    "type": [
-      "string",
-      "null"
-    ]
-  },
-  "water_aed": {
-    "type": [
-      "number",
-      "null"
-    ]
-  }
-}

removedOutput schema / $defs / EmirateCosts / properties / utilities / required

Removed value: -[
-  "provider",
-  "monthly_aed",
-  "electricity_aed",
-  "water_aed",
-  "basis",
-  "vat_note",
-  "calculated",
-  "missing",
-  "source_urls"
-]

removedOutput schema / $defs / EmirateCosts / properties / utilities / type
```
Removed value: -"object"
```

removedOutput schema / $defs / EmirateCosts / required

Removed value: -[
-  "emirate_id",
-  "name",
-  "rent",
-  "utilities",
-  "housing_fee",
-  "schools",
-  "intercity_buses",
-  "areas",
-  "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"

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

Changed23 schema fields changedOct 6, 2026

removedInput schema / properties / emirate_id / type
```
Removed value: -"string"
```
removedOutput schema / $defs / EmirateCosts / properties / areas / items / properties / point / $ref
```
Removed value: -"#/$defs/GeoPoint"
```
addedOutput schema / $defs / EmirateCosts / properties / areas / items / properties / point / additionalProperties
```
Added value: +false
```

addedOutput schema / $defs / EmirateCosts / properties / areas / items / properties / point / properties

Added value: +{
+  "approximate": {
+    "type": "boolean"
+  },
+  "lat": {
+    "type": "number"
+  },
+  "lon": {
+    "type": "number"
+  }
+}

addedOutput schema / $defs / EmirateCosts / properties / areas / items / properties / point / required
```
Added value: +[
+  "lat",
+  "lon",
+  "approximate"
+]
```
addedOutput schema / $defs / EmirateCosts / properties / areas / items / properties / point / type
```
Added value: +"object"
```
removedOutput schema / $defs / EmirateCosts / properties / emirate_id / type
```
Removed value: -"string"
```
removedOutput schema / $defs / EmirateCosts / properties / housing_fee / properties / status / type
```
Removed value: -"string"
```
removedOutput schema / $defs / EmirateCosts / properties / provenance / $ref
```
Removed value: -"#/$defs/Provenance"
```
addedOutput schema / $defs / EmirateCosts / properties / provenance / additionalProperties
```
Added value: +true
```

addedOutput schema / $defs / EmirateCosts / properties / provenance / required

Added value: +[
+  "source_id",
+  "license_id",
+  "source_url",
+  "observed_on",
+  "observed_at",
+  "published_on",
+  "published_at",
+  "retrieved_at",
+  "stale",
+  "status",
+  "paused_since",
+  "flags"
+]

addedOutput schema / $defs / EmirateCosts / properties / provenance / type
```
Added value: +"object"
```
removedOutput schema / $defs / EmirateCosts / properties / rent / properties / medians / items / properties / property_type / type
```
Removed value: -"string"
```

changedOutput schema / $defs / EmirateCosts / properties / rent / properties / period / anyOf

Previous value: -[
-  {
-    "$ref": "#/$defs/Period"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "from": {
+        "type": "string"
+      },
+      "months": {
+        "type": [
+          "integer",
+          "null"
+        ]
+      },
+      "to": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "from",
+      "to",
+      "months"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / $defs / EmirateCosts / properties / rent / properties / status / type
```
Removed value: -"string"
```
removedOutput schema / $defs / EmirateCosts / properties / schools / properties / status / type
```
Removed value: -"string"
```

removedOutput schema / $defs / EmirateCostsListResponse

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

removedOutput schema / $defs / EmirateCostsResponse

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

removedOutput schema / $defs / GeoPoint

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "approximate": {
-      "type": "boolean"
-    },
-    "lat": {
-      "type": "number"
-    },
-    "lon": {
-      "type": "number"
-    }
-  },
-  "required": [
-    "lat",
-    "lon",
-    "approximate"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / Period

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "from": {
-      "type": "string"
-    },
-    "months": {
-      "type": [
-        "integer",
-        "null"
-      ]
-    },
-    "to": {
-      "type": "string"
-    }
-  },
-  "required": [
-    "from",
-    "to",
-    "months"
-  ],
-  "type": "object"
-}

removedOutput schema / $defs / Provenance

Removed value: -{
-  "additionalProperties": true,
-  "required": [
-    "source_id",
-    "license_id",
-    "source_url",
-    "observed_on",
-    "observed_at",
-    "published_on",
-    "published_at",
-    "retrieved_at",
-    "stale",
-    "status",
-    "paused_since",
-    "flags"
-  ],
-  "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/EmirateCostsListResponse"
-  },
-  {
-    "$ref": "#/$defs/EmirateCostsResponse"
-  },
-  {
-    "$ref": "#/$defs/ToolFailure"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "context": {
+        "anyOf": [
+          {
+            "$ref": "#/$defs/EmirateCostContext"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "data": {
+        "items": {
+          "$ref": "#/$defs/EmirateCosts"
+        },
+        "type": "array"
+      },
+      "links": {
+        "$ref": "#/$defs/Links"
+      },
+      "meta": {
+        "$ref": "#/$defs/ResponseMeta"
+      }
+    },
+    "required": [
+      "meta",
+      "context",
+      "data",
+      "links"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "context": {
+        "anyOf": [
+          {
+            "$ref": "#/$defs/EmirateCostContext"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "data": {
+        "anyOf": [
+          {
+            "$ref": "#/$defs/EmirateCosts"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "links": {
+        "$ref": "#/$defs/Links"
+      },
+      "meta": {
+        "$ref": "#/$defs/ResponseMeta"
+      }
+    },
+    "required": [
+      "meta",
+      "context",
+      "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

B3.1/5.0

Behavior3/5

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

The annotations already declare this as a read-only, idempotent, non-destructive, closed-world operation. The description adds useful behavioral context by warning that non-Dubai rent data is unknown, but it does not describe pagination behavior or other result characteristics.

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 very short, front-loaded, and contains no filler. The two telegraphic fragments are efficient, though the caveat sentence is slightly terse rather than fully integrated.

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?

The tool has an output schema and strong annotations, which reduce the description's burden. However, with 0% schema description coverage and three undocumented parameters, the description does not provide enough guidance on filtering, pagination, or when to omit emirate_id.

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?

Schema description coverage is 0%, so the input schema itself provides no semantic help for the three parameters. The description mentions emirates and cost categories but does not explain emirate_id enum behavior, cursor pagination, or page_size limits.

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?

The description states a specific comparison action over emirates, with rent, utilities, and schools as the compared dimensions. It is clear what the tool does, but it does not explicitly distinguish itself from siblings such as costs_by_area or fixed_monthly_costs.

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

Usage Guidelines3/5

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

The phrase 'Compare emirates' implies the intended use case, but there is no explicit guidance on when to choose this tool over alternatives like costs_by_area, housing_rents, or fixed_monthly_costs. No exclusions or prerequisites are stated.

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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