get_length

THE RISK

Low Risk

Why get_length needs a policy

This tool performs a read-only calculation on geometry data—it measures and returns the length of a geometric feature. There are no side effects, no data modifications, no external command execution, and no irreversible actions. It is analogous to a simple getter or query operation in the geospatial analysis context.

From the tool's definition Tool name 'get_length' and description 'Get the length of a geometry' indicate a query operation that retrieves a computed measurement from geospatial data without modifying, deleting, or executing external operations.

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

POLICY

How to control get_length

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_length:

policy.json

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

get_length 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 98 GIS MCP Server tools →

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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_length

What does the get_length tool do? +

Get the length 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_length? +

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

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

Can I rate-limit get_length? +

Yes. Add a rate_limit block to the get_length 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_length completely? +

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

get_length 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 →