get_geocentric_crs

THE RISK

Low Risk

Why get_geocentric_crs needs a policy

This tool retrieves or looks up geocentric coordinate reference system (CRS) data based on input coordinates. It performs no modifications, deletions, or side effects on data. It does not execute arbitrary code or trigger external operations. It is a straightforward read/query operation typical of geospatial analysis utilities.

From the tool's definition Tool name 'get_geocentric_crs' and description 'Get geocentric CRS for given coordinates' indicate a query/retrieval operation that obtains coordinate reference system information for given inputs.

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

POLICY

How to control get_geocentric_crs

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

policy.json

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

get_geocentric_crs 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 GIS 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 →

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EXPLORE

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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 get_geocentric_crs

What does the get_geocentric_crs tool do? +

Get geocentric CRS for given coordinates. It is categorised as a Read tool in the GIS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_geocentric_crs? +

Register the GIS MCP Server MCP server in PolicyLayer and add a rule for get_geocentric_crs: 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 GIS MCP Server. Nothing to install.

What risk level is get_geocentric_crs? +

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

Can I rate-limit get_geocentric_crs? +

Yes. Add a rate_limit block to the get_geocentric_crs 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 get_geocentric_crs completely? +

Set action: deny in the PolicyLayer policy for get_geocentric_crs. 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 get_geocentric_crs? +

get_geocentric_crs is provided by the GIS MCP Server MCP server (mahdin75/gis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GIS MCP Server tool call.

Start from GIS 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 →