chathome.lu — Luxembourg Real Estate

Vibe Search

search_vibe

Read-onlyIdempotent

Preferred natural-language ('vibe') property search. Pass the user's request as prose and the engine matches on lifestyle, mood, proximity, and soft preferences via embeddings + LLM reasoning. Healthy runs return source-grounded match reasons and a 0-100 request-fit score (not a probability); degraded runs explicitly omit ranking claims. Every sourced result identifies and links the original agency listing and states its latest catalogue re-sighting time. The response's understanding block states what was understood; wishes in understanding.notChecked are not confirmed for any returned home. If the requested place cannot be resolved safely, it returns no listings plus a machine-readable unanswerable reason instead of substituting unrelated homes.

Input Schema

TableJSON Schema

Name	Required	Description
`brief`	No	The `session.brief` object from the previous search_vibe response, passed back unchanged to continue that search. Without `followUp` it replays the same search without re-reading the request.
`limit`	No	Number of results to return (max 50, default 20)
`query`	Yes	Natural-language description of what the user wants, in their own words — e.g. "quiet 2-bed near Kirchberg with a balcony under €2000" or "bright family house with a garden, short commute to Belval, energy class A". Lifestyle, vibe, proximity, and soft preferences all work here.
`intent`	No	Whether to search rentals or properties for sale (default: "rent")
`locale`	No	Response locale: en, fr, de, lu (Luxembourgish), pt (default: en; 'lb' is a deprecated alias for 'lu')
`followUp`	No	A change to the previous search or a question about its results, in the user’s own words — e.g. "cheaper", "like #2 but with a garden", "which one has parking?". Send it with the `brief` from the previous response (`session.brief`) and the same `query`. A question leaves the search unchanged and comes back as `followUp.reply`.
`includePhotos`	No	Attach thumbnail photos of the top results as image content blocks (default: true). Set false for a lean text-only response.
`shownListingIds`	No	Ids of the listings you showed the user, in the order shown, so "#2" or "the second one" in `followUp` points at the right home.

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"
+}

Changed7 schema fields changedSep 28, 2026

addedInput schema / properties / brief

Added value: +{
+  "additionalProperties": {},
+  "description": "The `session.brief` object from the previous search_vibe response, passed back unchanged to continue that search. Without `followUp` it replays the same search without re-reading the request.",
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

addedInput schema / properties / followUp

Added value: +{
+  "description": "A change to the previous search or a question about its results, in the user’s own words — e.g. \"cheaper\", \"like #2 but with a garden\", \"which one has parking?\". Send it with the `brief` from the previous response (`session.brief`) and the same `query`. A question leaves the search unchanged and comes back as `followUp.reply`.",
+  "maxLength": 800,
+  "minLength": 1,
+  "type": "string"
+}

addedInput schema / properties / shownListingIds

Added value: +{
+  "description": "Ids of the listings you showed the user, in the order shown, so \"#2\" or \"the second one\" in `followUp` points at the right home.",
+  "items": {
+    "maxLength": 128,
+    "minLength": 1,
+    "type": "string"
+  },
+  "maxItems": 10,
+  "type": "array"
+}

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

A4.4/5.0

Behavior5/5

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

Goes well beyond the annotations (readOnly/idempotent/non-destructive/openWorld=false), disclosing degraded-run behavior (ranking claims omitted), that the fit score is not a probability, sourcing/re-sighting guarantees, and that unresolved places yield an unanswerable reason rather than substituted homes.

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?

Front-loaded with the core purpose and dense with useful specifics, though the final sentences about sourcing and unanswerable results make it fairly long. Nearly every clause earns its place, but it could be tightened.

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

Completeness5/5

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

For an 8-parameter tool with nested objects and an output schema, the description covers the operational edge cases an agent needs (degraded runs, unconfirmed wishes, unanswerable reasons, follow-up flow) without redundantly restating return shapes.

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

Parameters3/5

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

Schema description coverage is 100%, so the schema already documents all eight parameters including brief, followUp, and shownListingIds. The description adds no syntax or format detail beyond that, so a baseline 3 is appropriate.

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+resource with its distinguishing mechanism: a natural-language 'vibe' search matched via embeddings + LLM reasoning. It is clearly separable from keyword siblings like search_rentals and search_for_sale.

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?

Declares itself the 'preferred natural-language' search and tells the agent to pass the user's request as prose, which is clear usage context. It stops short of naming the sibling tools it should be chosen over, so the when-not/alternative case is left implicit.

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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