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chathome.lu — Luxembourg Real Estate

by lu.chathome
OverviewDiscussionsAdmin

Compare Listings

compare_listings
Read-onlyIdempotent

Compare two to eight listing IDs or ChatHome URLs without account linking through normalized AgentListing v2 facts: known and estimated costs, availability, property, checks, station frequency, commute, value context, sources, freshness, duplicates and unknowns. Missing values never prove equality or become zero. Only active publicly eligible listings are returned.

Input Schema

NameRequiredDescriptionDefault
idsYesTwo to eight listing IDs or ChatHome listing URLs
localeNoResponse locale: en, fr, de, lu (Luxembourgish), pt (default: en; 'lb' is a deprecated alias for 'lu')

Output Schema

NameRequiredDescriptionDefault
trustYes
listingsYes
notFoundIdsYes
schemaVersionYes
comparisonFieldsYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changed
    • changedInput schema / properties / ids / description
      Previous value: -"Two to eight listing IDs returned by a ChatHome search tool"New value: +"Two to eight listing IDs or ChatHome listing URLs"
    • addedInput schema / properties / ids / items / maxLength
      Added value: +2048
    • addedOutput schema / properties / listings / items / properties / match / properties / closeReasons
      Added value: +{
+  "items": {
+    "oneOf": [
+      {
+        "additionalProperties": false,
+        "properties": {
+          "concept": {
+            "type": "string"
+          },
+          "criterionId": {
+            "type": "string"
+          },
+          "kind": {
+            "const": "not_confirmed",
+            "type": "string"
+          },
+          "label": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "criterionId",
+          "concept",
+          "label"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "actual": {
+            "type": "number"
+          },
+          "concept": {
+            "type": "string"
+          },
+          "criterionId": {
+            "type": "string"
+          },
+          "delta": {
+            "minimum": 0,
+            "type": "number"
+          },
+          "direction": {
+            "enum": [
+              "over",
+              "under"
+            ],
+            "type": "string"
+          },
+          "expected": {
+            "type": "number"
+          },
+          "field": {
+            "type": "string"
+          },
+          "kind": {
+            "const": "numeric",
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "criterionId",
+          "concept",
+          "field",
+          "expected",
+          "actual",
+          "delta",
+          "direction"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "actualLocalityId": {
+            "type": "string"
+          },
+          "actualName": {
+            "type": "string"
+          },
+          "askedLocalityId": {
+            "type": "string"
+          },
+          "askedName": {
+            "type": "string"
+          },
+          "distanceKm": {
+            "maximum": 12,
+            "minimum": 0,
+            "type": "number"
+          },
+          "kind": {
+            "const": "nearby_commune",
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "askedLocalityId",
+          "actualLocalityId",
+          "askedName",
+          "actualName",
+          "distanceKm"
+        ],
+        "type": "object"
+      }
+    ]
+  },
+  "type": "array"
+}
    • changedOutput schema / properties / listings / items / properties / match / properties / resultKind / anyOf
      Previous value: -[
-  {
-    "enum": [
-      "strict_match",
-      "partial_match",
-      "relaxed_alternative"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "match",
+      "close"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
  2. Changed2 schema fields changed
    • removedOutput schema / properties / listings / items / properties / match / properties / closeReasons
      Removed value: -{
-  "items": {
-    "oneOf": [
-      {
-        "additionalProperties": false,
-        "properties": {
-          "concept": {
-            "type": "string"
-          },
-          "criterionId": {
-            "type": "string"
-          },
-          "kind": {
-            "const": "not_confirmed",
-            "type": "string"
-          },
-          "label": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "criterionId",
-          "concept",
-          "label"
-        ],
-        "type": "object"
-      },
-      {
-        "additionalProperties": false,
-        "properties": {
-          "actual": {
-            "type": "number"
-          },
-          "concept": {
-            "type": "string"
-          },
-          "criterionId": {
-            "type": "string"
-          },
-          "delta": {
-            "minimum": 0,
-            "type": "number"
-          },
-          "direction": {
-            "enum": [
-              "over",
-              "under"
-            ],
-            "type": "string"
-          },
-          "expected": {
-            "type": "number"
-          },
-          "field": {
-            "type": "string"
-          },
-          "kind": {
-            "const": "numeric",
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "criterionId",
-          "concept",
-          "field",
-          "expected",
-          "actual",
-          "delta",
-          "direction"
-        ],
-        "type": "object"
-      },
-      {
-        "additionalProperties": false,
-        "properties": {
-          "actualLocalityId": {
-            "type": "string"
-          },
-          "actualName": {
-            "type": "string"
-          },
-          "askedLocalityId": {
-            "type": "string"
-          },
-          "askedName": {
-            "type": "string"
-          },
-          "distanceKm": {
-            "maximum": 12,
-            "minimum": 0,
-            "type": "number"
-          },
-          "kind": {
-            "const": "nearby_commune",
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "askedLocalityId",
-          "actualLocalityId",
-          "askedName",
-          "actualName",
-          "distanceKm"
-        ],
-        "type": "object"
-      }
-    ]
-  },
-  "type": "array"
-}
    • changedOutput schema / properties / listings / items / properties / match / properties / resultKind / anyOf
      Previous value: -[
-  {
-    "enum": [
-      "match",
-      "close"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "strict_match",
+      "partial_match",
+      "relaxed_alternative"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
  3. Changed2 schema fields changed
    • addedOutput schema / properties / listings / items / properties / match / properties / closeReasons
      Added value: +{
+  "items": {
+    "oneOf": [
+      {
+        "additionalProperties": false,
+        "properties": {
+          "concept": {
+            "type": "string"
+          },
+          "criterionId": {
+            "type": "string"
+          },
+          "kind": {
+            "const": "not_confirmed",
+            "type": "string"
+          },
+          "label": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "criterionId",
+          "concept",
+          "label"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "actual": {
+            "type": "number"
+          },
+          "concept": {
+            "type": "string"
+          },
+          "criterionId": {
+            "type": "string"
+          },
+          "delta": {
+            "minimum": 0,
+            "type": "number"
+          },
+          "direction": {
+            "enum": [
+              "over",
+              "under"
+            ],
+            "type": "string"
+          },
+          "expected": {
+            "type": "number"
+          },
+          "field": {
+            "type": "string"
+          },
+          "kind": {
+            "const": "numeric",
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "criterionId",
+          "concept",
+          "field",
+          "expected",
+          "actual",
+          "delta",
+          "direction"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "actualLocalityId": {
+            "type": "string"
+          },
+          "actualName": {
+            "type": "string"
+          },
+          "askedLocalityId": {
+            "type": "string"
+          },
+          "askedName": {
+            "type": "string"
+          },
+          "distanceKm": {
+            "maximum": 12,
+            "minimum": 0,
+            "type": "number"
+          },
+          "kind": {
+            "const": "nearby_commune",
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "askedLocalityId",
+          "actualLocalityId",
+          "askedName",
+          "actualName",
+          "distanceKm"
+        ],
+        "type": "object"
+      }
+    ]
+  },
+  "type": "array"
+}
    • changedOutput schema / properties / listings / items / properties / match / properties / resultKind / anyOf
      Previous value: -[
-  {
-    "enum": [
-      "strict_match",
-      "partial_match",
-      "relaxed_alternative"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "match",
+      "close"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
  4. Changed1 schema field changed
    • 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"
+}
  5. Added

TDQS

A4.2/5.0
Behavior5/5

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and non-destructive behavior, so the safety profile is covered. The description adds important behavioral context beyond annotations: no account linking is required, results are limited to active publicly eligible listings, and missing values must not be treated as equality or zero. These caveats materially affect how an agent should interpret results.

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

Conciseness4/5

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

The purpose is front-loaded in a single sentence, and every clause conveys scope or a data caveat rather than filler. It is dense because it enumerates many compared fact categories, but the density is justified and there is no redundant prose.

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?

An output schema exists, so return structure need not be explained in the description. The description covers the comparison scope, accepted inputs, eligibility filtering, normalized fact categories, and the critical missing-value caveat, leaving little an agent needs to infer before calling it.

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%, and the schema already documents the ids array's min/max items and the locale enum. The description repeats the two-to-eight range and confirms ChatHome URLs are accepted, but adds no further parameter syntax, format, or validation detail beyond what the schema provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses the specific verb 'Compare' with the resource 'listings', states the accepted input range (two to eight listing IDs or ChatHome URLs), and makes clear this is a multi-listing comparison rather than a single-listing lookup. An agent can distinguish it from siblings like get_listing or search_rentals without inspecting the schema.

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

Usage Guidelines3/5

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

It establishes the comparison context and input constraints, but never explicitly says when to use this tool instead of get_listing, get_listing_truth, or search tools, nor does it state when not to use it. Usage is implied by 'Compare two to eight' rather than routed against alternatives.

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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