get_geometry_type

THE RISK

Low Risk

Why get_geometry_type needs a policy

This is a read-only operation that inspects and returns information about a geometry's type (e.g., Point, Polygon, LineString). It performs no creation, modification, deletion, or execution of external commands. The low severity reflects minimal risk even if misused by an agent—it only returns type information.

From the tool's definition Tool name 'get_geometry_type' and description 'Get the type of a geometry' indicate a pure query operation that retrieves metadata about an existing geometry object without modification, side effects, or data manipulation.

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

POLICY

How to control get_geometry_type

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_geometry_type:

policy.json

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

get_geometry_type 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.

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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_geometry_type

What does the get_geometry_type tool do? +

Get the type of a geometry. 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_geometry_type? +

Register the GIS MCP Server MCP server in PolicyLayer and add a rule for get_geometry_type: 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_geometry_type? +

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

Can I rate-limit get_geometry_type? +

Yes. Add a rate_limit block to the get_geometry_type 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_geometry_type completely? +

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

get_geometry_type 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 →