ikeytz Einsatzgebiet-Karten

find_by_plz

Read-only

WHAT: All Einsatzgebiete with this PLZ (not only the first). plz required (or q as PLZ). RETURNS items[] point cards + count. USE when several Stadtteile share a postcode. NEXT: get_service_area(slug) for one card.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`q`	No	Alias for plz if plz omitted
`plz`	Yes	Required German postcode.

Output Schema

TableJSON Schema

Name	Required	Description
`ok`	Yes	true = use summary, canonicalUrl, and extra keys. false = do not invent data; read error + hint and retry with valid args or open hint.
`plz`	No	Queried PLZ
`hint`	No	Present when ok=false. Absolute URL or short recovery hint the agent should open or pass to another tool.
`tool`	Yes	Echo of the tool name that produced this object (e.g. get_service_area).
`count`	No	Number of Gebiete
`error`	No	Present when ok=false. Codes include: unknown_place, unknown_discovery, unknown_doc, q_required, plz_required, coords_required, outside_service_area, url_required, not_maps_host, bad_url, path_or_url_required, serp_not_found, slug_or_coords_required, path_required.
`items`	No	All matches
`locale`	No	Locale actually used for URLs. maps is German-only: always de (MAPS-E8 — no /en on maps). Requested non-de is ignored; payload locale=de.
`related`	No	Always includes https://maps.ikeytz.com/llms.txt.
`summary`	No	Primary text for the model. For discovery tools this is the file window. For list tools a compact one-liner. Quote with attribution.
`attribution`	Yes	Required citation: 'Quelle: Schlüsseldienst Ludwigsburg ikeytz (ikeytz.com) · ai-train=no · https://maps.ikeytz.com/.well-known/ai.txt'
`canonicalUrl`	No	Best URL to show the user: https://maps.ikeytz.com… page, public embed JSON, tel:+49…, mailto:…, https://wa.me/…, or a www pointer. Prefer this over constructing URLs.

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedSep 3, 2026

addedInput schema / properties / plz / description
```
Added value: +"Required German postcode."
```
addedInput schema / properties / q / description
```
Added value: +"Alias for plz if plz omitted"
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Always the same envelope. tools/call returns content[0].text = summary (or JSON) AND structuredContent = this object. On success ok=true with summary + canonicalUrl + extra fields. On failure ok=false with error (snake_case code) and hint (recovery URL). Never writes, never submits forms, never books. Attribution must be kept when quoting. Policy: ai-input yes with attribution; ai-train=no. Host is maps.ikeytz.com (geo/Einsatzgebiet). Prices/FAQ/legal HTML live on www — maps only points.",
+  "properties": {
+    "attribution": {
+      "description": "Required citation: 'Quelle: Schlüsseldienst Ludwigsburg ikeytz (ikeytz.com) · ai-train=no · https://maps.ikeytz.com/.well-known/ai.txt'",
+      "type": "string"
+    },
+    "canonicalUrl": {
+      "description": "Best URL to show the user: https://maps.ikeytz.com… page, public embed JSON, tel:+49…, mailto:…, https://wa.me/…, or a www pointer. Prefer this over constructing URLs.",
+      "type": "string"
+    },
+    "count": {
+      "description": "Number of Gebiete",
+      "type": "number"
+    },
+    "error": {
+      "description": "Present when ok=false. Codes include: unknown_place, unknown_discovery, unknown_doc, q_required, plz_required, coords_required, outside_service_area, url_required, not_maps_host, bad_url, path_or_url_required, serp_not_found, slug_or_coords_required, path_required.",
+      "type": "string"
+    },
+    "hint": {
+      "description": "Present when ok=false. Absolute URL or short recovery hint the agent should open or pass to another tool.",
+      "type": "string"
+    },
+    "items": {
+      "description": "All matches",
+      "items": {
+        "additionalProperties": true,
+        "description": "One Einsatzgebiet point card (not a polygon).",
+        "properties": {
+          "distance_km": {
+            "description": "Present on geo-ranked results: air distance from query point",
+            "type": "number"
+          },
+          "embed_map": {
+            "description": "https://maps.ikeytz.com/{slug}",
+            "format": "uri",
+            "type": "string"
+          },
+          "geo_api": {
+            "description": "https://maps.ikeytz.com/api/v1/embed/ort/{slug}",
+            "format": "uri",
+            "type": "string"
+          },
+          "google_maps": {
+            "description": "Paste-ready 'lat, lng'",
+            "type": "string"
+          },
+          "icbm": {
+            "description": "ICBM 'lat, lng' (same as google_maps)",
+            "type": "string"
+          },
+          "kind": {
+            "description": "stadtteil | ort",
+            "type": "string"
+          },
+          "lat": {
+            "description": "WGS84 latitude of THIS place",
+            "type": "number"
+          },
+          "lng": {
+            "description": "WGS84 longitude of THIS place",
+            "type": "number"
+          },
+          "maps_mcp": {
+            "const": "https://maps.ikeytz.com/mcp",
+            "description": "maps MCP endpoint",
+            "format": "uri",
+            "type": "string"
+          },
+          "name": {
+            "description": "German place name",
+            "type": "string"
+          },
+          "parent": {
+            "description": "Ludwigsburg or Landkreis Ludwigsburg",
+            "type": "string"
+          },
+          "plz": {
+            "description": "Postcode",
+            "type": "string"
+          },
+          "slug": {
+            "description": "maps slug",
+            "type": "string"
+          },
+          "url": {
+            "description": "Keyword/www page URL when present",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "locale": {
+      "description": "Locale actually used for URLs. maps is German-only: always de (MAPS-E8 — no /en on maps). Requested non-de is ignored; payload locale=de.",
+      "enum": [
+        "de"
+      ],
+      "type": "string"
+    },
+    "ok": {
+      "description": "true = use summary, canonicalUrl, and extra keys. false = do not invent data; read error + hint and retry with valid args or open hint.",
+      "type": "boolean"
+    },
+    "plz": {
+      "description": "Queried PLZ",
+      "type": "string"
+    },
+    "related": {
+      "description": "Always includes https://maps.ikeytz.com/llms.txt.",
+      "items": {
+        "format": "uri",
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "summary": {
+      "description": "Primary text for the model. For discovery tools this is the file window. For list tools a compact one-liner. Quote with attribution.",
+      "type": "string"
+    },
+    "tool": {
+      "description": "Echo of the tool name that produced this object (e.g. get_service_area).",
+      "type": "string"
+    }
+  },
+  "required": [
+    "ok",
+    "tool",
+    "attribution"
+  ],
+  "type": "object"
+}

First observedSep 1, 2026

TDQS

A4.5/5.0

Behavior4/5

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

The annotation only declares readOnlyHint=true; the description adds meaningful behavioral details beyond that, such as returning all matching entries rather than just the first, and the response shape 'items[] point cards + count.' This enriches the agent's understanding of what will happen.

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?

The description is compact and well-structured with WHAT, RETURNS, USE, and NEXT labels. Every sentence adds a distinct piece of information, and the most important scoping detail is front-loaded.

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 a simple read-only lookup with an existing output schema and full schema coverage, this description covers the essential points: what it returns, when to use it, how to specify the postcode, and what to do next. Nothing critical is missing.

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 plz and q well. The description's 'plz required (or q as PLZ)' restates the schema's alias relationship without adding new format, constraints, or interaction details, so it stays at the baseline.

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 clearly states that the tool returns all Einsatzgebiete matching a PLZ, with the explicit caveat 'not only the first' to distinguish it from tools that might return a single result. It also names the next tool in the workflow, get_service_area(slug), for drilling into one card.

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

Usage Guidelines5/5

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

It gives an explicit usage condition: 'USE when several Stadtteile share a postcode.' It also provides an alternative path with 'NEXT: get_service_area(slug) for one card,' which tells the agent when to move on to a different tool.

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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