chathome.lu — Luxembourg Real Estate

Show Listing Cards

render_listing_cards

Read-onlyIdempotent

Render one to eight exact results from a prior property search as an interactive MCP Apps photo carousel. Call a search tool first, then copy its listing IDs and any returned match scores/reasons without alteration. The tool re-reads canonical public listing facts before display.

Input Schema

TableJSON Schema

Name	Required	Description
`locale`	No	Response locale: en, fr, de, lu (Luxembourgish), pt (default: en; 'lb' is a deprecated alias for 'lu')
`heading`	No	Short user-facing heading grounded in the search request
`listings`	Yes	One to eight exact listing IDs from search_vibe, search_rentals, or search_for_sale, in display order

Output Schema

TableJSON Schema

Name	Required	Description
`note`	No
`total`	Yes	Exact number of listing objects returned in this response; not the number of matches in the market.
`trust`	No
`source`	No
`hasMore`	No
`ranking`	No
`session`	No
`followUp`	No
`listings`	Yes
`countKind`	No
`truncated`	No
`nextCursor`	No
`matchingCount`	No
`returnedCount`	No
`understanding`	No	What the engine understood from the request. notChecked lists wishes no returned home is confirmed to have.
`searchExhaustive`	No
`matchingCountKind`	No
`excludedUnprovenCount`	No	Upstream rows omitted because public facts could not prove every requested hard filter.
`marketMatchingUpperBound`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 1, 2026

addedOutput schema / properties / listings / items / properties / unknown

Added value: +{
+  "description": "Why each missingFields entry is unknown. not_in_search_result means get_listing may know it.",
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "field": {
+        "type": "string"
+      },
+      "reason": {
+        "enum": [
+          "not_stated",
+          "not_proven",
+          "conflicted",
+          "not_in_search_result"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "field",
+      "reason"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Changed4 schema fields changedSep 28, 2026

removedOutput schema / properties / coverageNotice

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "reason": {
-      "const": "outside_luxembourg",
-      "type": "string"
-    }
-  },
-  "required": [
-    "reason"
-  ],
-  "type": "object"
-}

addedOutput schema / properties / followUp

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "outcome": {
+      "enum": [
+        "applied",
+        "answered"
+      ],
+      "type": "string"
+    },
+    "reply": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "outcome"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / session

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "brief": {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    }
+  },
+  "required": [
+    "brief"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / understanding

Added value: +{
+  "additionalProperties": false,
+  "description": "What the engine understood from the request. notChecked lists wishes no returned home is confirmed to have.",
+  "properties": {
+    "checked": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "force": {
+            "enum": [
+              "must",
+              "should",
+              "nice"
+            ],
+            "type": "string"
+          },
+          "meaning": {
+            "type": "string"
+          },
+          "needId": {
+            "type": "string"
+          },
+          "operator": {
+            "type": "string"
+          },
+          "unit": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "value": {
+            "anyOf": [
+              {
+                "anyOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "string"
+                  }
+                ]
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "required": [
+          "meaning",
+          "needId",
+          "operator",
+          "value",
+          "unit",
+          "force"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "commutes": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "destination": {
+            "type": "string"
+          },
+          "force": {
+            "enum": [
+              "must",
+              "should",
+              "nice"
+            ],
+            "type": "string"
+          },
+          "maxMinutes": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "mode": {
+            "anyOf": [
+              {
+                "enum": [
+                  "transit",
+                  "drive",
+                  "walk",
+                  "bike"
+                ],
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "required": [
+          "destination",
+          "mode",
+          "maxMinutes",
+          "force"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "excludedPropertyTypes": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "notChecked": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "force": {
+            "enum": [
+              "must",
+              "should",
+              "nice"
+            ],
+            "type": "string"
+          },
+          "meaning": {
+            "type": "string"
+          },
+          "reason": {
+            "enum": [
+              "no_listing_fact",
+              "fact_not_collected_yet"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "meaning",
+          "force",
+          "reason"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "offer": {
+      "enum": [
+        "whole",
+        "room",
+        "either"
+      ],
+      "type": "string"
+    },
+    "places": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "country": {
+            "anyOf": [
+              {
+                "enum": [
+                  "LU",
+                  "FR",
+                  "BE",
+                  "DE"
+                ],
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "force": {
+            "enum": [
+              "must",
+              "should",
+              "nice"
+            ],
+            "type": "string"
+          },
+          "kind": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          },
+          "radiusKm": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "role": {
+            "enum": [
+              "live",
+              "work",
+              "near",
+              "avoid"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "role",
+          "kind",
+          "country",
+          "radiusKm",
+          "force"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "propertyTypes": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "transaction": {
+      "anyOf": [
+        {
+          "enum": [
+            "buy",
+            "rent"
+          ],
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "understood": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "understood",
+    "transaction",
+    "propertyTypes",
+    "excludedPropertyTypes",
+    "offer",
+    "places",
+    "commutes",
+    "checked",
+    "notChecked"
+  ],
+  "type": "object"
+}

Changed25 schema fields changedAug 31, 2026

addedOutput schema / properties / excludedUnprovenCount

Added value: +{
+  "description": "Upstream rows omitted because public facts could not prove every requested hard filter.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

addedOutput schema / properties / hasMore
```
Added value: +{
+  "type": "boolean"
+}
```

addedOutput schema / properties / listings / items / properties / amenities

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "balcony": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "elevator": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "furnished": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "garden": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "parking": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "petsAllowed": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "stepFreeAccess": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "wheelchairAccessible": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "furnished",
+    "elevator",
+    "parking",
+    "balcony",
+    "garden",
+    "petsAllowed",
+    "stepFreeAccess",
+    "wheelchairAccessible"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / availability

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "availableFrom": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "moveInState": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "offerStatus": {
+      "enum": [
+        "available",
+        "under_offer",
+        "unknown"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "offerStatus",
+    "availableFrom",
+    "moveInState"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / duplicates

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "confirmedOtherSources": {
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    "confirmedSourceCount": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    }
+  },
+  "required": [
+    "confirmedOtherSources",
+    "confirmedSourceCount"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / fieldProvenance

Added value: +{
+  "additionalProperties": {
+    "additionalProperties": false,
+    "properties": {
+      "method": {
+        "enum": [
+          "source_structured",
+          "source_text",
+          "official_dataset",
+          "calculation",
+          "manual_review",
+          "model_extraction",
+          "model_only",
+          "unknown"
+        ],
+        "type": "string"
+      },
+      "observedAt": {
+        "anyOf": [
+          {
+            "format": "date-time",
+            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "publisher": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "sourceUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "status": {
+        "enum": [
+          "confirmed",
+          "estimated",
+          "thin_sample",
+          "stale",
+          "context_only",
+          "conflicted",
+          "not_collected",
+          "source_unavailable",
+          "suppressed"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "status",
+      "publisher",
+      "method",
+      "sourceUrl",
+      "observedAt"
+    ],
+    "type": "object"
+  },
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / history

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "daysListed": {
+      "anyOf": [
+        {
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "firstObservedAt": {
+      "anyOf": [
+        {
+          "format": "date-time",
+          "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$",
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "firstObservedBasis": {
+      "const": "source_listing_date_or_chathome_ingest",
+      "type": "string"
+    },
+    "lastChangedAt": {
+      "anyOf": [
+        {
+          "format": "date-time",
+          "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$",
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "priceDropTotalEur": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "firstObservedAt",
+    "firstObservedBasis",
+    "daysListed",
+    "priceDropTotalEur",
+    "lastChangedAt"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / location

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "address": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "city": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "confidence": {
+      "enum": [
+        "verified",
+        "unverified",
+        "contradicted",
+        "unknown"
+      ],
+      "type": "string"
+    },
+    "district": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "postalCode": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "precision": {
+      "enum": [
+        "exact_address",
+        "street",
+        "district",
+        "commune_only",
+        "unknown"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "city",
+    "district",
+    "address",
+    "postalCode",
+    "precision",
+    "confidence"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / match

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "allRequiredConstraintsSatisfied": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "reasons": {
+      "items": {
+        "type": "string"
+      },
+      "maxItems": 3,
+      "type": "array"
+    },
+    "requiredConstraints": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "actual": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "number"
+              },
+              {
+                "type": "boolean"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "id": {
+            "type": "string"
+          },
+          "status": {
+            "enum": [
+              "matched",
+              "not_matched",
+              "not_verified",
+              "not_applied"
+            ],
+            "type": "string"
+          },
+          "target": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "number"
+              },
+              {
+                "type": "boolean"
+              },
+              {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "required": [
+          "id",
+          "status",
+          "target",
+          "actual"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "resultKind": {
+      "anyOf": [
+        {
+          "enum": [
+            "strict_match",
+            "partial_match",
+            "relaxed_alternative"
+          ],
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "allRequiredConstraintsSatisfied",
+    "resultKind",
+    "requiredConstraints",
+    "reasons"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / missingFields

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / listings / items / properties / officialScreening

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / property

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "airConditioning": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "colocation": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "completionYear": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "condition": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "constructionYear": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "floor": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "hasFloorplan": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "heatingEnergy": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "heatingType": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "landAreaSqm": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "privateRoomAreaSqm": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "rentByOwner": {
+      "anyOf": [
+        {
+          "const": true,
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "rooms": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "totalFloors": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "rooms",
+    "floor",
+    "totalFloors",
+    "constructionYear",
+    "completionYear",
+    "landAreaSqm",
+    "privateRoomAreaSqm",
+    "condition",
+    "heatingType",
+    "heatingEnergy",
+    "airConditioning",
+    "hasFloorplan",
+    "rentByOwner",
+    "colocation"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / listings / items / properties / propertyChecks

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / rent

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "agencyFee": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "agencyFeeBasis": {
+          "anyOf": [
+            {
+              "enum": [
+                "tenant_share",
+                "total_commission",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "baseMonthly": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "chargesIncluded": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "chargesMonthly": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "deposit": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "depositExceedsMaximum": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "depositMaximum": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "estimatedMonthlyTotal": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "estimatedMonthlyTotalIsLowerBound": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "estimatedUtilitiesMonthly": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "exactUpfrontCost": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "firstChargeAdvance": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "heatingMayBeDoubleCounted": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "indicativeInsuranceMonthly": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "knownMonthlyLowerBound": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "knownUpfrontCost": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "mandatoryMoveInFeeTotal": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "mandatoryMoveInFees": {
+          "items": {
+            "additionalProperties": {},
+            "properties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "mandatoryRecurringFeeTotal": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "mandatoryRecurringFees": {
+          "items": {
+            "additionalProperties": {},
+            "properties": {},
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "monthlyTotal": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "monthlyTotalStatus": {
+          "anyOf": [
+            {
+              "enum": [
+                "known",
+                "unknown_charges",
+                "conflicting_charges",
+                "invalid_price",
+                "unknown_mandatory_recurring_fees"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "reportedDeposit": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "unknownComponents": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "upfrontCostIsExact": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "upfrontCostIsLowerBound": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "required": [
+        "baseMonthly",
+        "chargesMonthly",
+        "chargesIncluded",
+        "monthlyTotal",
+        "monthlyTotalStatus",
+        "knownMonthlyLowerBound",
+        "estimatedMonthlyTotal",
+        "estimatedMonthlyTotalIsLowerBound",
+        "estimatedUtilitiesMonthly",
+        "indicativeInsuranceMonthly",
+        "heatingMayBeDoubleCounted",
+        "firstChargeAdvance",
+        "reportedDeposit",
+        "deposit",
+        "depositMaximum",
+        "depositExceedsMaximum",
+        "agencyFee",
+        "agencyFeeBasis",
+        "mandatoryRecurringFees",
+        "mandatoryRecurringFeeTotal",
+        "mandatoryMoveInFees",
+        "mandatoryMoveInFeeTotal",
+        "knownUpfrontCost",
+        "exactUpfrontCost",
+        "upfrontCostIsLowerBound",
+        "upfrontCostIsExact",
+        "unknownComponents"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / schemaVersion
```
Added value: +{
+  "const": "agent-listing.v2",
+  "type": "string"
+}
```

addedOutput schema / properties / listings / items / properties / source

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "agencyConfirmedAt": {
+          "anyOf": [
+            {
+              "format": "date-time",
+              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "agencyListingId": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "agencyName": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "lastSeenAt": {
+          "anyOf": [
+            {
+              "format": "date-time",
+              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "listingUrl": {
+          "format": "uri",
+          "type": "string"
+        },
+        "status": {
+          "enum": [
+            "active",
+            "under_offer",
+            "unknown"
+          ],
+          "type": "string"
+        },
+        "statusBasis": {
+          "enum": [
+            "source_catalog_seen",
+            "listing_record_active"
+          ],
+          "type": "string"
+        },
+        "type": {
+          "const": "original_agency_listing",
+          "type": "string"
+        }
+      },
+      "required": [
+        "type",
+        "agencyName",
+        "listingUrl",
+        "agencyListingId",
+        "lastSeenAt",
+        "status",
+        "statusBasis",
+        "agencyConfirmedAt"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / transport

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / valueContext

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "fairPrice": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "marketContext": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "priceIntegrity": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {},
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "priceIntegrity",
+    "fairPrice",
+    "marketContext"
+  ],
+  "type": "object"
+}

changedOutput schema / properties / listings / items / required

Previous value: -[
-  "id",
-  "url",
-  "title",
-  "status",
-  "price",
-  "currency",
-  "listingType",
-  "propertyType",
-  "city",
-  "district",
-  "country",
-  "beds",
-  "baths",
-  "areaSqm",
-  "energyClass",
-  "imageUrl",
-  "agencyName",
-  "latitude",
-  "longitude"
-]New value: +[
+  "schemaVersion",
+  "id",
+  "url",
+  "title",
+  "status",
+  "price",
+  "currency",
+  "listingType",
+  "propertyType",
+  "city",
+  "district",
+  "country",
+  "beds",
+  "baths",
+  "areaSqm",
+  "energyClass",
+  "imageUrl",
+  "agencyName",
+  "source",
+  "rent",
+  "availability",
+  "property",
+  "location",
+  "history",
+  "duplicates",
+  "amenities",
+  "fieldProvenance",
+  "officialScreening",
+  "propertyChecks",
+  "transport",
+  "valueContext",
+  "missingFields",
+  "match",
+  "latitude",
+  "longitude"
+]

addedOutput schema / properties / marketMatchingUpperBound

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / matchingCount

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / matchingCountKind

Added value: +{
+  "enum": [
+    "exact",
+    "lower_bound",
+    "unavailable"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / nextCursor
```
Added value: +{
+  "type": "null"
+}
```

addedOutput schema / properties / returnedCount

Added value: +{
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

addedOutput schema / properties / searchExhaustive
```
Added value: +{
+  "type": "boolean"
+}
```

Changed34 schema fields changedAug 30, 2026

addedOutput schema / properties / countKind

Added value: +{
+  "const": "returned",
+  "type": "string"
+}

addedOutput schema / properties / listings / items / properties / agencyName

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / areaSqm

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / baths

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / beds

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / charges

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / city

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / country

Added value: +{
+  "anyOf": [
+    {
+      "enum": [
+        "LU",
+        "FR",
+        "BE",
+        "DE"
+      ],
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / currency
```
Added value: +{
+  "const": "EUR",
+  "type": "string"
+}
```

addedOutput schema / properties / listings / items / properties / description

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / district

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / energyClass

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / features

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / listings / items / properties / hasSourceCheckedFacts
```
Added value: +{
+  "type": "boolean"
+}
```
addedOutput schema / properties / listings / items / properties / id
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / listings / items / properties / imageUrl

Added value: +{
+  "anyOf": [
+    {
+      "format": "uri",
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / latitude

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / listingType

Added value: +{
+  "enum": [
+    "rent",
+    "sale"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / listings / items / properties / longitude

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / matchReasons

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "maxItems": 3,
+  "type": "array"
+}

addedOutput schema / properties / listings / items / properties / photoUrls

Added value: +{
+  "items": {
+    "format": "uri",
+    "type": "string"
+  },
+  "maxItems": 5,
+  "type": "array"
+}

addedOutput schema / properties / listings / items / properties / price

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / pricePerSqm

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / propertyType

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / listings / items / properties / score

Added value: +{
+  "maximum": 100,
+  "minimum": 0,
+  "type": "number"
+}

addedOutput schema / properties / listings / items / properties / status
```
Added value: +{
+  "const": "active",
+  "type": "string"
+}
```
addedOutput schema / properties / listings / items / properties / title
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / listings / items / properties / url
```
Added value: +{
+  "format": "uri",
+  "type": "string"
+}
```

addedOutput schema / properties / listings / items / required

Added value: +[
+  "id",
+  "url",
+  "title",
+  "status",
+  "price",
+  "currency",
+  "listingType",
+  "propertyType",
+  "city",
+  "district",
+  "country",
+  "beds",
+  "baths",
+  "areaSqm",
+  "energyClass",
+  "imageUrl",
+  "agencyName",
+  "latitude",
+  "longitude"
+]

addedOutput schema / properties / ranking

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "planFingerprint": {
+      "type": "string"
+    },
+    "probability": {
+      "const": false,
+      "type": "boolean"
+    },
+    "scoreKind": {
+      "const": "request_fit",
+      "type": "string"
+    },
+    "status": {
+      "enum": [
+        "available",
+        "degraded"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "status",
+    "scoreKind",
+    "probability"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / total / description

Added value: +"Exact number of listing objects returned in this response; not the number of matches in the market."

addedOutput schema / properties / total / maximum
```
Added value: +9007199254740991
```
addedOutput schema / properties / total / minimum
```
Added value: +0
```

changedOutput schema / properties / total / type

Previous value: -"number"New value: +"integer"

Changed1 schema field changedAug 29, 2026

addedOutput schema / properties / coverageNotice

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "reason": {
+      "const": "outside_luxembourg",
+      "type": "string"
+    }
+  },
+  "required": [
+    "reason"
+  ],
+  "type": "object"
+}

First observedAug 21, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds real behavioral context beyond that: the tool 're-reads canonical public listing facts before display' (data may be refreshed, not a blind echo of cached input) and enforces the 1–8 display cap. It does not discuss rendering failures or locale fallback behavior.

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, front-loaded with the capability and cardinality limit, followed by the prerequisite and the data-freshness note. No filler or restatement of the title.

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, return values need not be described, and annotations carry the safety profile. The description supplies the missing pieces an agent actually needs: the search-first prerequisite, the 1–8 constraint, exact-copy semantics, and the canonical re-read behavior.

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. The description earns above baseline by stressing that listing IDs, scores, and match reasons must be copied 'without alteration' — a constraint on how the parameters must be sourced that the schema only implies. It does not add meaning for locale or heading.

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 ('Render') and resource ('one to eight exact results ... as an interactive MCP Apps photo carousel'), and distinguishes itself from the search siblings by operating on results of a prior search rather than performing one. An agent can tell this display tool apart from search_vibe/search_rentals without opening any 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?

Explicit prerequisite: 'Call a search tool first, then copy its listing IDs and any returned match scores/reasons without alteration.' This tells the agent the ordering and the input provenance clearly. It does not state when-not to use it or name a preferred search sibling in the prose, so it stops short of 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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