Atly

Find areas

list_areas

Read-only

List supported areas

Cities, neighborhoods and states Atly covers — densest in the United States, with pockets in Mexico, Israel and Thailand — each with an id you can pass to search, a center, a bounding box when known, and how many places it holds. Filter with q (substring of the name) and level (city, neighborhood, state). Results are ordered by place count.

Input Schema

Name	Required	Description
`q`	No	Area name or common abbreviation, e.g. "san diego", "midtown", "nyc". Exact and prefix matches rank first.
`level`	No	Restrict to one level.
`limit`	No	Maximum areas to return, at most 200; a larger value returns 200.

Output Schema

Name	Required	Description	Default
`areas`	No
`total`	No
`call_id`	No
`doc_notes`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed4 schema fields changedOct 25, 2026

addedInput schema / properties / limit / maximum
```
Added value: +9007199254740991
```
changedOutput schema / additionalProperties
```
Previous value: -falseNew value: +{}
```

changedOutput schema / properties / areas / anyOf

Previous value: -[
-  {
-    "items": {
-      "additionalProperties": false,
-      "properties": {
-        "bbox": {
-          "anyOf": [
-            {
-              "description": "[west, south, east, north]",
-              "items": {
-                "type": "number"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "description": "[west, south, east, north]"
-        },
-        "center": {
-          "anyOf": [
-            {
-              "description": "[lon, lat]",
-              "items": {
-                "type": "number"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "description": "[lon, lat]"
-        },
-        "country": {
-          "description": "Country the area is in. Coverage is densest in the United States",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "id": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "level": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "name": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "parent": {
-          "description": "City for neighborhoods.",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "place_count": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "region": {
-          "description": "State for US cities and neighborhoods; the equivalent district or province elsewhere.",
-          "type": [
-            "string",
-            "null"
-          ]
-        }
-      },
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": {},
+      "properties": {
+        "bbox": {
+          "anyOf": [
+            {
+              "items": {
+                "type": "number"
+              },
+              "type": "array"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "[west, south, east, north]"
+        },
+        "center": {
+          "anyOf": [
+            {
+              "items": {
+                "type": "number"
+              },
+              "type": "array"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "[lon, lat]"
+        },
+        "country": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Country the area is in. Coverage is densest in the United States, with pockets in Mexico, Israel and Thailand."
+        },
+        "id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "level": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "name": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "parent": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "City for neighborhoods."
+        },
+        "place_count": {
+          "anyOf": [
+            {
+              "maximum": 9007199254740991,
+              "minimum": -9007199254740991,
+              "type": "integer"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "region": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "State for US cities and neighborhoods; the equivalent district or province elsewhere."
+        }
+      },
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / total / anyOf

Previous value: -[
-  {
-    "type": "integer"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "maximum": 9007199254740991,
+    "minimum": -9007199254740991,
+    "type": "integer"
+  },
+  {
+    "type": "null"
+  }
+]

Changed2 schema fields changedOct 21, 2026
- addedInput schema / properties / limit / description
```
Added value: +"Maximum areas to return, at most 200; a larger value returns 200."
```
- removedInput schema / properties / limit / maximum
```
Removed value: -200
```
First observedOct 5, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds useful behavior beyond that: the geographic coverage shape ('densest in the United States, with pockets in Mexico, Israel and Thailand'), the presence of bounding boxes 'when known', and that results are ordered by place count.

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 action, followed by the payload shape and filters in two compact sentences. The 'densest in the United States...' clause is flavor but does convey coverage scope, so it earns most of its space.

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

Completeness4/5

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

With an output schema present and annotations covering safety, the description need only cover scope, filters and result shape — all of which it does. It stops short of noting anything about the 200-item cap or ordering tie-breaks, but those live in the schema.

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 all three parameters are already documented with examples and enum values. The description restates `q` as a substring of the name and `level` as city/neighborhood/state, which adds little beyond the schema; baseline 3 applies.

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 opens with a specific verb+resource ('List supported areas') and then enumerates what each area contains (id, center, bounding box, place count), which makes it unmistakable against siblings like search_places or list_categories. An agent can tell exactly what this returns without opening 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 Guidelines4/5

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

It explains the practical workflow — 'each with an `id` you can pass to search' — and states how to narrow results via `q` and `level`. It does not explicitly state when to prefer search_places or list_categories over this tool, so no exclusion guidance is given.

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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