download_area_all

THE RISK

Low Risk

Why download_area_all needs a policy

This tool queries OpenStreetMap's public geographic database and retrieves/downloads read-only data in a structured format. It has no side effects, does not modify data, does not execute arbitrary code, and does not delete or move resources. The blast radius of misuse is minimal—an agent could over-query the API or request large datasets, but no irreversible harm or financial impact is possible.

From the tool's definition Tool description indicates 'download' and 'retrieve all data' from a specified area (buildings, roads, POIs) from OpenStreetMap via Overpass API.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access download_area_all gives an agent:

POLICY

How to control download_area_all

PolicyLayer is an MCP gateway — it sits between your AI agents and OSM-GeoJSON-MCP-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for download_area_all:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "download_area_all": {}
  }
}

download_area_all is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register OSM-GeoJSON-MCP-Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More OSM-GeoJSON-MCP-Server tools

Execute convert_to_geojson ダウンロード済みのOSMファイルをGeoJSONに変換 Write download_osm_data OpenStreetMapデータをダウンロードしてファイルに保存します。大きなデータも扱えます。 Read get_amenities 指定した矩形範囲内のアメニティ（施設・設備）をGeoJSON形式で取得します。レストラン、病院、学校などのPOI（興味のある地点）データが含まれます。 Read get_api_stats API使用統計情報とキャッシュ状況を取得します。モニタリングとデバッグに使用します。 Read get_buildings 指定した矩形範囲内の建物データをGeoJSON形式で取得します。建物タイプでフィルタリング可能です。 Read get_green_spaces 指定した矩形範囲内の緑地・公園データをGeoJSON形式で取得します。公園、森林、農地、庭園などの緑地情報が含まれます。 Read get_railways 指定した矩形範囲内の鉄道データをGeoJSON形式で取得します。鉄道線路、駅、地下鉄、トラムなどの交通インフラが含まれます。 Read get_roads 指定した矩形範囲内の道路ネットワークをGeoJSON形式で取得します。道路タイプでフィルタリング可能です。

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about download_area_all

What does the download_area_all tool do? +

指定エリアの全データをダウンロード（建物、道路、POIなど）. It is categorised as a Read tool in the OSM-GeoJSON-MCP-Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on download_area_all? +

Register the OSM-GeoJSON-MCP-Server MCP server in PolicyLayer and add a rule for download_area_all: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches OSM-GeoJSON-MCP-Server. Nothing to install.

What risk level is download_area_all? +

download_area_all is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit download_area_all? +

Yes. Add a rate_limit block to the download_area_all rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block download_area_all completely? +

Set action: deny in the PolicyLayer policy for download_area_all. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides download_area_all? +

download_area_all is provided by the OSM-GeoJSON-MCP-Server MCP server (shimizu/osm-geojson-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OSM-GeoJSON-MCP-Server tool call.

Start from OSM-GeoJSON-MCP-Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →