AI agents call get_departement_communes 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 retrieves and lists public administrative data (communes within a department) from the French Open Data/IGN service. It has no side effects, does not modify data, execute code, or trigger external operations. The action is a simple read/query operation on geographic administrative data, which is low-risk and informational.
From the tool's definition Tool name 'get_departement_communes' and verb 'Lister' (list) indicate data retrieval. Description begins 'Lister toutes les communes d[...]' (List all communes...), consistent with querying administrative divisions.
Documented attack patterns abuse exactly the kind of access get_departement_communes 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_departement_communes:
{
"version": "1",
"default": "deny",
"tools": {
"get_departement_communes": {}
}
}get_departement_communes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lister toutes les communes d. 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_departement_communes: 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_departement_communes 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_departement_communes 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_departement_communes. 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_departement_communes 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.
Free to start. No card required.
26 French Open Data & IGN tools catalogued and risk-classified — across an index of 43,000+ MCP servers.