AI agents call get_wms_map_url to retrieve information from French Open Data & IGN without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns map data/URLs from IGN cartographic services with no side effects. It retrieves geographic visualization data similar to how get_commune_info retrieves administrative data. There is no creation, modification, deletion, execution of arbitrary code, or financial impact.
From the tool's definition Tool name 'get_wms_map_url' and context indicate it generates or retrieves a WMS (Web Map Service) URL for map visualization. The sibling tools (calculate_isochrone, geocode_address, get_commune_info, etc.) are all read-only data retrieval operations.
Documented attack patterns abuse exactly the kind of access get_wms_map_url gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and French Open Data & IGN, and nothing reaches the server without passing your rules. This is the rule we recommend for get_wms_map_url:
{
"version": "1",
"default": "deny",
"tools": {
"get_wms_map_url": {}
}
}get_wms_map_url is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Générer l. It is categorised as a Read tool in the French Open Data & IGN MCP Server, which means it retrieves data without modifying state.
Register the French Open Data & IGN MCP server in PolicyLayer and add a rule for get_wms_map_url: 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 French Open Data & IGN. Nothing to install.
get_wms_map_url 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_wms_map_url 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_wms_map_url. 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_wms_map_url is provided by the French Open Data & IGN MCP server (nikoko107/mcp-datagouv-ign). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from French Open Data & IGN, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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26 French Open Data & IGN tools catalogued and risk-classified — across an index of 43,000+ MCP servers.