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。
AI agents call get_roads to retrieve information from OSM-GeoJSON-MCP-Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only retrieval of OpenStreetMap road data. It queries the Overpass API and returns filtered geographic data without creating, modifying, deleting, or executing any operations. The function signature and description indicate a simple data retrieval with filtering, characteristic of Read category tools. No side effects or irreversible actions are possible.
From the tool's definition Tool retrieves road network data within specified bounds as GeoJSON format with optional filtering by road type. The description indicates a query operation ('取得します' = retrieves/obtains) with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access get_roads gives an agent:
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 get_roads:
{
"version": "1",
"default": "deny",
"tools": {
"get_roads": {}
}
}get_roads is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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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。. It is categorised as a Read tool in the OSM-GeoJSON-MCP-Server MCP Server, which means it retrieves data without modifying state.
Register the OSM-GeoJSON-MCP-Server MCP server in PolicyLayer and add a rule for get_roads: 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.
get_roads is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_roads 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.
Set action: deny in the PolicyLayer policy for get_roads. 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.
get_roads 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.
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.
Free to start. No card required.
11 OSM-GeoJSON-MCP-Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.